spau 110 c residual overvoltage relay - abb...- module sptu 240 s1 u aux = 80...265 v ac/dc - module...

RS 422 Ser.No.

SPAU 110 C

2

5

1306

fn = 50Hz

60Hz

12345

/ >tt

n )( >n )( >>

>>/ tt%[ ]%[ ]

Uaux

80...265V ~–

18...80V –

SPCU 1C6

REGISTERS

0 0 0 0

12345678

0 1

SGR

n/U Uo %[ ]UoUo

nU = 100V 110V IRF

1310

[ ]s>t

0.5

0.05 1.0

50

10

0.5

0.05 1.0

2

10

20

STEP

RESET

SG1

0 1

12345678

>U >>U

SPCU 1C6

B

>>

[ ]s>>t

U o

nU>U o

nUUo 80

o o

[ ]%

[ ]%

U

STEP

SPAU 110 CResidual overvoltage relay

User´s manual and Technical description

2

SPAU 110 CResidual

overvoltage relay

Contents Features .......................................................................................................................... 2Application ..................................................................................................................... 3Description of function .................................................................................................. 3Connections ................................................................................................................... 4Configuration of output relays ........................................................................................ 6Operation indicators ....................................................................................................... 7Combined power supply and I/O module ...................................................................... 7Technical data (modified 2002-04) ................................................................................. 8Applications .................................................................................................................. 10Testing ......................................................................................................................... 17Maintenance and repair ................................................................................................ 20Spare parts .................................................................................................................... 20Ordering numbers ........................................................................................................ 20Dimensions and instructions for mounting .................................................................. 21Information required with order ................................................................................... 22

The complete user’s manual for the residual overvoltage relay SPAU 110 C includesthe following documents:

Residual overvoltage relay SPAU 110 C, general part 1MRS 750607-MUM ENResidual voltage relay module SPCU 1C6 1MRS 750509-MUM ENGeneral characteristics of C-type relay modules 1MRS 750328-MUM EN

Features Definite-time residual overvoltage earth-faultprotection

Two independent operation stages, e.g. one forsignalling and the other for tripping

Freely selectable output relay functions

Flexible adaptation to different protection ap-plications

Digital display of setting values, residual voltageand recorded fault values

Data communications via serial interface

Continuous internal self-supervision with faultdiagnosis

1MRS 750607-MUM EN

Issued 1997-01-09Modified 2002-04-25Version B (replaces 34 SPAU 14 EN1)Checked MKApproved OL

Data subject to change without notice

3

Application The residual overvoltage relay SPAU 110 C isdesigned to be used for earth fault protection inisolated neutral, resistance earthed or reactanceearthed systems. In resonant earthed systemsrelay starting can be used to control the switch-ing device of the neutral resistor. The protection

relay can also be used for the earth fault protec-tion of generators and motors and for the unbal-ance protection of capacitor banks. The protec-tion relay forms an integrated protection scheme,including two-stage earth fault protection andflexible trip and signal functions.

Description offunction

The residual overvoltage relay SPAU 110 C is asecondary relay which is to be connected to thevoltage transformers of the protected object.When a fault occurs, the residual overvoltagerelay can be used for tripping a circuit breaker orfor signalling an earth-fault only, as required bythe protection application.

When the energizing voltage exceeds the set startvalue of the low-set voltage stage U0>, the re-sidual overvoltage relay starts. After the set oper-ate time t> the low-set stage operates, if the faultstill persists. The high-set voltage stage operatesin the same way. When the measured voltage

exceeds the set start value U0>>, the high-set stagestarts, and after the set time t>> the high-set stageoperates, if the fault still persists.

Start information from the residual overvoltagerelay is obtained as a contact function, whichfurther can be used for controlling other coop-erating protection relays, e.g. neutral currentmeasuring earth fault relays.

The relay contains one optically isolated logicinput to be controlled by an external controlvoltage. In the residual overvoltage relay thecontrol input is used as a blocking input.

TRIP 1

TRIP 2

START 1

IRF

SIGNAL 1

SERIAL I/O

U o LOW-SET DEFINITE TIMERESIDUAL OVERVOLTAGE STAGE

HIGH-SET DEFINITE TIMERESIDUAL OVERVOLTAGE STAGE

BLOCKING FUNCTION FOR BOTH OVERVOLTAGE STAGES

SERIAL COMMUNICATION

59N

59N

BLOCKING

START 2

Fig. 1. Protection functions of the residual overvoltage relay SPAU 110 C. The encircled numbersrefer to the ANSI (= American National Standards Institute) number of the concerned protectionfunction.

4

≅

100V110V

SGR/1

U2

U3

U3 1 1 1 1

D C B A

+ -

Uaux

E

+-

(~)(~)

L1L2L3

A

N

dadn

SGR

28 29 30 10 11 61 62 70 71 72 74 75 77 78 80 81 68 69 65 66

7 53 2 4 68

SPAU 110 C

_

SP

A-Z

C_

Rx Tx

START1 SIGNAL1 TRIP2 TRIP1IRFBS

IRF

73 74 75

START2

F

TS2

TS1

SGB

SS1

SS2

U1

5

4

I/O

t >>

t >Uo>

Uo>>

SERIALPORT

Fig. 2. Connection diagram for the residual overvoltage relay SPAU 110 C.

Uaux Auxiliary supply voltageA,B,C,D,E,F Output relaysIRF Self-supervision outputBS Blocking signalSS Start signalTS Trip signalSGR Switchgroup for configuring trip and alarm signalsSGB Switchgroup for configuring blocking signalsTRIP_ Trip outputSIGNAL1 Signal on relay operationSTART_ Start information or relay operationU1 Residual voltage relay module SPCU 1C6U2 Power supply and I/O module SPTU 240S1 or SPTU 48S1U3 I/O module SPTE 1E11SERIAL PORT Serial communication portSPA-ZC_ Bus connection moduleRx/Tx Receiver input Rx and transmitter output Tx of the bus connection module

Connections

5

Mad

e in

Fin

land

28

29

30

73

74

75

70

71

72

61

62

65

66

68

69

80

81

77

78

10

11

TTL

B47

0497

Rx

Tx

Fig.3. Rear view of residual overvoltage relay SPAU 110 C.

Specification of input and output terminals

Terminals Function

28-29 Residual voltage U0 (Un = 100 V)28-30 Residual voltage U0 (Un = 110 V)10-11 External blocking signal (BS)61-62 Auxiliary power supply. When DC voltage is used the positive pole is connected

to terminal 61.65-66 Trip output 1 of stages U0> and U0>> (TRIP 1)68-69 Trip output 2 of stages U0> and U0>> (TRIP 2)80-81 Signal on tripping of U0> and U0>> stages (SIGNAL 1)77-78 Signal on tripping of U0>> stage, start of U0> and U0>> stages (START 1)73-74-75 Start of U0> stage (START 2).

In normal conditions the contact interval 73-75 is closed.When the U0> stage starts, the contact interval 74-75 closes.

70-71-72 Self-supervision (IRF) alarm output.In normal conditions the contact interval 70-72 is closed. When the auxiliaryvoltage is lost or an internal fault is detected the contact interval 71-72 closes.Protective earth terminal

The protection relay is connected to the fibreoptic data communication bus over the busconnection module SPA-ZC 17 or SPA-ZC 21.

The bus connection module is fitted to the D-type connector on the rear panel of the relay.The pre-mounted opto-connectors of the opti-cal fibres are plugged into the counter connec-tors Rx and Tx on the bus connection module.

6

addition, the following functions can be se-lected with the switches of the SGR switchgrouplocated on the front panel:

Configuration ofoutput relays

The start signal of the U0> stage is permanentlywired to output relay F and the trip signal tooutput relay A. The trip signal of the U0>> stageis permanently wired to output relay B. In

Switch Function Default User’ssettings settings

SGR/1 Links the BS blocking signal to the residual overvoltagerelay module 1

SGR/2 Links the start signal of the U0>> stage to output relay D 1

SGR/3 Links the start signal of the U0> stage to output relay D 1

SGR/4 Links the trip signal of the U0>> stage to output relay D 1

SGR/5 Links the trip signal of the U0>> stage to output relay C 1

SGR/6 Links the trip signal of the U0>> stage to output relay A 1

SGR/7 Links the trip signal of the U0> stage to output relay C 1

SGR/8 Links the trip signal of the U0> stage to output relay B 1

The circuit breakers can be operated directlyboth via output relay A and output relay B. Thusthe protection stages may have their own output

relay or two separate circuit breakers can becontrolled with one protection relay.

7

Operationindicators

RS 422 Ser.No.

SPAU 110 C

2

5

1306

fn = 50Hz

60Hz

12345

/ >tt

n )( >n )( >>

>>/ tt%[ ]%[ ]

Uaux

80...265V ~–

18...80V –

SPCU 1C6

REGISTERS

0 0 0 0

12345678

0 1

SGR

n/U Uo %[ ]UoUo

nU = 100V 110V IRF

1310

[ ]s>t

0.5

0.05 1.0

50

10

0.5

0.05 1.0

2

10

20

STEP

RESET

SG1

0 1

12345678

>U >>U

SPCU 1C6

B

>>

[ ]s>>t

U o

nU>U o

nUUo 80

o o

[ ]%

[ ]%

U

STEP

1. Either voltage stage has its own start/opera-tion indicator (U0> and U0>>), located in theright bottom corner of the front panel of therelay module. Yellow light indicates that theconcerned stage has started and red light thatthe stage has operated (tripped).

With the SG2 switchgroup the start and tripindicators can be given a latching feature,which means that the LEDs remain lit, al-though the signal that caused operation fallsbelow the set value. The indicators are resetwith the RESET push-button. An unresetindicator does not affect the operation of therelay.

2. The yellow LED (U0) above the display is litwhen the measured residual voltage is shownon the display.

3. The red IRF indicator of the self-supervisionsystem indicates that a permanent fault hasbeen detected. The fault code appearing onthe display once a fault has been detectedshould be recorded and notified when serviceis ordered.

4. The green Uaux LED on the front panel is litwhen the power supply module operates prop-erly.

5. The LED indicator below each one of thesetting knobs is lit to indicate that the settingvalue displayed refers to the concerned set-ting knob.

6. The LED of the SG1 switchgroup is lit, whenthe checksum of the switchgroup is displayed.

The operation indicators, the SG2 selectorswitchgroup and the LEDs of the setting knobsare described more detailed in manual for theresidual overvoltage relay module SPCU 1C6.

Combined powersupply and I/Omodule

The power supply and I/O module (U2) islocated behind the system front panel of theprotection relay and can be withdrawn afterremoval of the system front panel. The powersupply and I/O module incorporates the powersource, the output relays, the control circuits ofthe output relays and the electronic circuitry ofthe external control input.

The power supply module is transformer con-nected, that is, the primary side and the second-ary circuits are galvanically isolated. The pri-mary side is protected by a slow 1 A fuse F1,placed on the PC board of the module. Whenthe power source operates properly, the greenUaux LED on the front panel is lit.

The power supply and I/O module is availablein two versions with different input voltageranges:

- module SPTU 240 S1Uaux = 80...265 V ac/dc

- module SPTU 48 S1Uaux = 18...80 V dc

The permitted input voltage range of the powersupply and I/O module inserted in the relay ondelivery is marked on the system panel panel ofthe relay.

8

Technical data(modified 2002-04)

Energizing inputs 100 V 110 VTerminals 28-29 28-30Rated voltage Un 100 V 110 VContinuous voltage withstand 2 x Un 2 x UnPower consumption at rated voltage <0.5 VARated frequency fn, acc. to order 50 Hz or 60 Hz

Output contact ratingsTrip contactsTerminals 65-66, 68-69Rated voltage 250 V ac/dcCarry continuously 5 AMake and carry for 0.5 s 30 AMake and carry for 3 s 15 ABreaking capacity for dc, when the control circuittime constant L/R ≤ 40 ms, at the control voltages- 220 V dc 1 A- 110 V dc 3 A- 48 V dc 5 A

Signalling contactsTerminals 70-71-72, 73-74-75,

77-78, 80-81Rated voltage 250 V ac/dcCarry continuously 5 AMake and carry for 0.5 s 10 AMake and carry for 3 s 8 ABreaking capacity for dc, when the control circuittime constant L/R ≤ 40 ms, at the control voltages- 220 V dc 0.15 A- 110 V dc 0.25 A- 48 V dc 1 A

External control input (blocking)Terminals 10-11Control voltage level 18...265 V dc or

80...265 V acCurrent consumption at activated input 2...20 mA

Auxiliary supply voltagePower supply and I/O modules and voltage ranges:- module SPTU 240 S1 80...265 V ac/dc- module SPTU 48 S1 18...80 V dcPower consumption under quiescent/operatingconditions of relay ~4 W/~6 W

9

Residual overvoltage relay module SPCU 1C6Low-set stage U0>Start voltage U0> 2...100% x UnOperate time t> 0.05...100 s

High-set stage U0>>Start voltage U0>> 2...80% x Un and ∞, infiniteOperate time t>> 0.05...100 s

Data communicationTransmission mode Fibre optic serial busData code ASCIISelectable data transfer rates 300, 1200, 2400,

4800 or 9600 BdFibre optic bus connection module,power supply from host relay- for plastic fibre cables SPA-ZC 21 BB- for glass fibre cables SPA-ZC 21 MMFibre optic bus connection module, providedwith integral power supply unit- for plastic fibre cables SPA-ZC 17 BB- for glass fibre cables SPA-ZC 17 MM

Insulation Tests *)Dielectric test IEC 60255-5 2 kV, 50 Hz, 1 minImpulse voltage test IEC 60255-5 5 kV, 1.2/50 µs, 0.5 JInsulation resistance measurement IEC 60255-5 >100 MΩ, 500 Vdc

Electromagnetic Compatibility Tests *)High-frequency (1 MHz) burst disturbance testIEC 60255-22-1- common mode 2.5 kV- differential mode 1.0 kVElectrostatic discharge test IEC 60255-22-2 andIEC 61000-4-2- contact discharge 6 kV- air discharge 8 kVFast transient disturbance test IEC 60255-22-4and IEC 61000-4-4- power supply 4 kV- I/O ports 2 kV

Environmental conditionsSpecified ambient service temperature range -10...+55°CLong term damp heat withstand as per IEC 60068-2-3 <95%, +40°C, 56 d/aRelative humidity as per IEC 60068-2-30 93...95%, +55°C, 6 cyclesTransport and storage temperature range -40...+70°CDegree of protection by enclosure at panel mounting IP54Weight of relay incl. flush mounting case 3.0 kg

*) The tests do not apply to the serial port, which is used exclusively for the bus connection module.

10

≅

100V110V

SGR/1

U2

U3U3 1 1 1 1

D C B A

+ -

Uaux

E

+-

(~)(~)

SGR

28 29 30 10 11 61 62 70 71 72 77 78 80 81 68 69 65 66

7 53 2 4 68

SPAU 110 C

_

SP

A-Z

C_

Rx Tx


0

I

0

I

-

-

+

+

L1 L3

+

IRF

SGB

SS1

U1

5

4

I/O

t >>

t >Uo>

Uo>>

TS1

SS2

TS2

747573

F

START2

R

1)

A

N

dadn

SERIALPORT

Applications

Example 1.The residualovervoltage relaySPAU 110 Cused for the earthfault protection ofisolated neutralsystems.

1) Enable signal to the neutral current relay of the feeder

Fig. 4. The residual overvoltage relay SPAU 110 C used for the earth fault protection of isolatedneutral systems.

An earth fault somewhere in a galvanically con-nected power system causes residual voltage. Forthis reason the residual overvoltage relay SPAU110 C is well adapted to be used as a generalearth fault alarm relay that monitors a definedpart of the power system.

The residual overvoltage relay SPAU 110 Cmeasures the residual voltage from the opendelta winding of the voltage transformers. Thisprocedure provides a relatively good accuracyof measurement. The ferroresonances of thevoltage transformers are suppressed by a resistorR incorporated in the open delta connection.

11

Switch SG1/SPCU 1C6 SGB/SPCU 1C6 SGR

1 1 0 Not in use 0 No blocking signal from feeders2 1 0 Not in use 1 U0>> start signal to output

relay D3 0 Not in use 0 Not in use 0 No U0> start signal to output

relay D4 0 No latching 0 No blocking to t> 0 No U0>> trip signal to output

relay D5 0 U0>= 2...20%xUn 0 No blocking to t>> 1 U0>> trip signal to output

relay C6 0 U0>>=10...80%xUn 0 Not in use 0 No U0>> trip signal to output

relay A7 1 0 Not in use 0 No U0> trip signal to output

relay C8 0 0 Not in use 0 No U0> trip signal to output

relay B∑ 67

The low-set stage of the residual overvoltagerelay indicates imminent earth faults. The re-sidual voltage in a sound isolated neutral net-work is normally very small, even less than 1%of the maximum residual voltage value. Thusthe low-set residual voltage stage can be given alow setting value.

The low-set stage can be used for enabling theneutral current measuring non-directional earthfault relays of the feeders. When an earth faultoccurs on a feeder both the neutral current earthfault relay of the feeder and the low-set stage ofthe busbar system residual voltage relay have tostart to enable tripping of the feeder circuitbreaker. The enabling system prevents unneces-sary operation of the neutral current earth faultrelay at short circuits, when a motor is started orunder normal service conditions. If a directionalearth fault relay is used on the feeder, no enablesignal is required.

The high-set stage is due to protect the busbarsystem and to serve as unselective back-up pro-tection for the feeder erth fault protection. Thesetting of the back-up protection stage of theresidual voltage relay must not be lower thanthat of the earth fault relays of the feeders. Alsopossible changes in the service preconditionsshould be considered.

The high-set stage also serves as earth faultprotection for the infeeder, if the trip signal isrouted to the HV side circuit breaker of thepower transformer as well as to the LV sidecircuit breaker. The trip signal for the HV sidecircuit breaker can be taken, for instance, fromthe contacts 80-81 and be routed to the circuitbreaker via an intermediate relay.

The switches of the residual overvoltage relaySPAU 110 C can be set as follows:

t>>= 0,5...10 s

t>= 5...100 s

When the switches are set as above the outputcontacts of SPAU 110 C have the followingfunctions:

Contact Function

65-66 Signal on delayed operation of U0> stage68-69 Circuit breaker trip signal from U0>> stage80-81 Alarm signal on final trip of U0>> stage77-78 Start signal of U0>> stage70-71-72 Self-supervision signal73-75 Blocking signal to the neutral current earth fault relay of the feeder74-75 Start signal of U0> stage, enable signal to the neutral current earth fault

relay of the feeder

12

SP

A-Z

C_

Rx Tx

TRIP2

A

N

0

I

0

I

-

-

+

+

Ran

G

≅

100V110V

SGR/1

U2

U3U3 1 1 1 1

D C B A

+ -

Uaux

E

+-

(~)(~)

SGR

28 29 30 10 11 61 62 70 71 72 74 75 77 78 80 81 68 69 65 66

7 53 2 4 68

SPAU 110 C

_


IRF

73 74 75

START2

F

TS2

TS1

SGB

SS1

SS2

U1

5

4

I/O

t >>

t >Uo>

Uo>>

+

L1 L3

SERIALPORT

Example 2.Earth faultprotection ofgenerators andmotors.

Fig. 5. Residual overvoltage relay SPAU 110 C used for the protection of a power generator.

13

Instead of using an open delta connection theresidual voltage can be measured over a voltagetransformer connected to the neutral, providedthe neutral is available. In the case of a blockconnected generator the galvanically connectednetwork is limited by the transformer, so a re-sidual overvoltage relay alone will form a satisfac-tory earth fault protection. In the connectionabove the residual voltage relay operates on earthfaults occurring in the stator winding of thegenerator or in the deltawinding of the trans-former. The low-set stage can be used for earthfault signalling. Due to the risk of a double earth

fault in the system, the high-set stage of theresidual overvoltage protection should be trip-ping. The signal tripping the generator excitationis taken, for instance, from the contacts 77-78.

A resistor connected in parallel with the voltagetransformer prevents HV side earth faults fromreflecting via the capacitances over the blocktransformers to the LV side, where they couldcause relay operations.



1 1 0 Not in use 0 No blocking signal from feeders2 0 0 Not in use 0 no U0>> start signal to output


relay D4 0 No latching 0 No blocking to t> 1 U0>> trip signal to output


relay C6 0 U0>>= 10...80%xUn 0 Not in use 0 No U0>> trip signal to output

relay A7 0 0 Not in use 0 No U0>> trip signal to output


relay B∑ 1

t>= 0,5...10 s

t>>= 0.05...1.0 s


Contact Function

65-66 Signal on delayed operation of U0> stage68-69 Circuit breaker trip signal from U0>> stage80-81 Signal on final trip of U0>> stage77-78 Trip signal to excitation circuit breaker73-74-75 Start signal of U0> stage70-71-72 Self-supervision signal

14

L1L2

L3

a

b

B A

0

Ι

0

Ι

-

-

+

+

≅

100V110V

SGR/1

U2

U3U3 1 1 1 1

D C B A

+ -

Uaux

E

+-

(~)(~)

SGR

28 29 30 10 11 61 62 70 71 72 74 75 77 78 80 81 68 69 65 66

7 53 2 4 68

SPAU 110 C

_

SP

A-Z

C_

Rx Tx


IRF

73 74 75

START2

F

TS2

TS1

SGB

SS1

SS2

U1

54

I/O

t >>

t >Uo>

Uo>>

SERIALPORT

Example 3.Unbalanceprotection ofcapacitor banks.

Fig. 6. Residual overvoltage relay SPAU 110 C used for unbalance protection of a capacitor bank.

15

The unbalance protection of a star-connectedcapacitor bank can also be implemented byusing the open delta connection for measuringthe unbalance voltage. The capacitor bank iscomposed of small units which are protected byinternal fuses. Burning of one or more fusescauses unbalance, and to detect this unbalancethe residual overvoltage relay SPAU 110 C isused. The function of the low-set stage of the

relay is signalling and that of the high-set stagetripping. The relay setting is determined by themanufacturer of the capacitor bank, because thesetting depends on the number of capacitorunits connected in parallel and in series andtheir rated values.



1 1 0 Not in use 0 No blocking signal from feeders2 0 0 Not in use 1 U0>> start signal to output


relay D4 0 No latching 0 No blocking to t> 0 No U0>> trip signal to output


relay C6 0 U0>>= 10...80%xUn 0 Not in use 0 No U0>> trip signal to output

relay A7 0 0 Not in use 0 No U0> trip signal to output


relay B∑ 1

t>= 0.5...10 s

t>>=0.05...1 s


Contact Function

65-66 Signal on delayed operation of U0> stage68-69 Circuit breaker trip from U0>> stage80-81 Alarm signal on final trip of U0>> stage77-78 Start signal of U0>> stage73-74-75 Start signal of U0> stage70-71-72 Self-supervision signal

16

Recorded data andfault analysis

The registers of the residual voltage relay mod-ule SPCU 1C6 provide a general view of theearth fault situations of the substation and of thebehaviour of the network during normal service.

Register 1 records the maximum measured re-sidual voltage as a multiple of the rated voltageof the relay energizing input. If the relay trips,the voltage at the moment of tripping is memo-rized. A new trip erases the old value and updatesthe register. The procedure is the same if avoltage measured exceeds the old value recorded.

The data of register 1 show how close the settingvalues are to actual values during normal opera-tion, by comparing the residual voltage indi-cated by the relay with the setting value.

By using the information of register 1 it is alsopossible to determine the smallest fault resist-ance at which an earth fault extinguishes by itselfor by auto-reclosures. By giving the low-setresidual voltage stage a signalling function andby selecting an operate time that is equal to thefinal trip delay of the feeder earth fault relay,register 1 allows the smallest fault resistance,that caused operation, to be determined, whenthe total earth fault current of the galvanicallyconnected network is known.

The relay should be reset after start, to preventthe updating level of the register from getting tohigh. Should the relay be linked to an event

reporting unit, the residual voltage value onstarting of the relay can be read and the registerscan be reset, when the start signals reset. Thusthe residual voltage value measured on startingof the relay is always known.

The number of times the different stages havestarted, registers 2 and 3, gives a picture of theoccurrence and distribution of the earth faults inrespect of the fault resistances of the earth faults.Frequent starts may indicate imminent earthfaults, e.g. insulation faults or orther faults, thateasily may develop to a total earth fault.

Registers 4 and 5 show the duration of the lateststart situation of the stages, expressed in per centof the set operate time. Any new start restarts thecounter from zero. If the stage trips, the registerwill show 100 [%].

Registers 4 and 5 contain information on theduration of an earth fault , or, if final trip hasbeen performed, the safety margin of the grad-ing times of selective protection. Generally, theresidual voltage does not disappear immediatelyafter opening of the circuit breaker of the faultyfeeder, so the start situation of the residualvoltage relay may continue for a short time afterthe circuit breaker has opened.

Registers 1...5 are reset either by pressing theSTEP and RESET push-buttons simultaneouslyor with a command, V102, over the SPA bus.

17

Testing Testing should always be performed in accord-ance with national regulations.

The protection relay incorporates an IRF func-tion that continuously monitors the internalstate of the relay and produces an alarm signal ondetection of a fault. According to the manufac-turer’s recommendations the relay should besubmitted to primary testing at five years’ inter-vals. These tests include the entire protectionchain from the measurement transformers tothe circuit breakers.

The secondary testing described in this manualis based on the relay’s setting values duringnormal operation. If necessary, the secondarytesting can be extended, for instance, by testingthe protection stages with several different set-ting values.

As switch positions and setting values have to bealtered during the test procedure the correctpositions of switches and correct values of therelay during normal operation have to be re-corded, for instance, on the reference card ac-companying the relay.

To enable secondary testing the relay has to bedisconnected from the pilot circuits, either atthe disconnectable terminal blocks or by usingthe test adapter fitted on the relay. It is extremely

important that the relay is disconnected fromthe residual voltade transformers. A possible tripsignal wired from the residual voltage relay tothe main circuit breaker should also be consid-ered when the relay is tested.

When auxiliary voltage is connected to theprotection relay, the relay performs a self-testingprogram, which excludes only the matchingtransformers and the contacts of the outputrelays. The operational condition of the relay istested by means of an ordinary relay test set. Thetest includes the matching transformers, theoutput relays and the accuracy of the operatevalues.

Equipment required for testing:

- adjustable voltage transformer 0...260 V, 1 A- isolating transformer 220/220 V- voltmeter- clock or timer for time measurement- DC voltage source for auxiliary voltage

supply- switches and lamps- supply and pilot wires- multimeter

Note the rated voltage prior to connecting thepilot wires to the relay terminals, see "Specifica-tion of input and output terminals".

18

SIG

NA

L1

V

TIM

ER

ST

AR

T

S1

L1N

+(~

)

-(~

)

S2

BS

ST

AR

T2

ST

AR

T1

L2

Uau

x

TIM

ER

ST

OP

TR

IP1

TR

IP2

L3

≅

100V110V

SG

R/1

U2

U3

U3

11

11

DC

BA

+-

E

SG

R

2829

3010

1161

6270

7172

7475

7778

8081

6869

6566

68

SP

AU

110

C

_

IRF

7374

75

F

TS

2

TS

1

SG

B

SS

1

SS

2

U1 54

I/O

t >>t >

Uo

>

Uo

>>

IRF

L4L1

32

47

5

Fig. 7. Secondary test connection of residual overvoltage relay SPAU 110 C.

After finishing the test connection and settingthe selector switches, connect the auxiliary volt-age to the relay.

19

voltmeter. The measurement can be made at therated voltage of the relay.

Starting

Carry out the test according to Fig. 7. Close theS1 switch and raise the voltage slowly until therelay operates (L2 is lit). Then read the startvoltage indicated on the voltmeter.

Operate time

Set the voltage to be fed to the relay for measur-ing the relay operate time at 2 x the set start valueof stage U0>. The clock is started by closing ofswitch S1 and stopped via contact 65-66 whenoutput relay A operates.

The operation of output relay C is indicated by L4.

When the relay starts, the U0> LED in the rightbottom corner is lit with yellow light. When therelay trips, the light of the same LED turns red.

Blocking

Set switches 4 and 5 of switchgroup SGB andswitch SGR/1 in position 1 (ON).

Close switch S2. Increase the test voltage untilthe relay starts, indicator U0> turns yellow.Wait until the set operate time t> has elapsed.The low-set stage must not operate, i.e. the U0>indicator must not turn red.

Testing of matchingtransformers

Apply voltage to the relay terminals and checkthat the voltage value indicated on the relaydisplay is equal to the value measured by the

Testing of low-setstage U0>

Set the switches of the SGR switchgroup asfollows before testing of the low-set stage:

Switch Position

1 12 03 04 05 06 07 18 0

When the switches are set as above the outputrelays have the following functions

Output relays Function(terminals)

A (65-66) Trip signal of U0> stageB (68-69) (Trip signal of U0>> stage)C (80-81) Information on trip of U0>

stageD (77-78) Not in useE (70-71-72) Self-supervision signalF (73-74-75) Start signal of U0>stage

Testing of high-setstage U0>>

Set the switches of the SGR switchgroup asfollows before starting the test of the high-setstage:

Switch Position

1 12 13 04 05 16 07 08 0

When the switches are set as above, the outputrelays have the following functions

Output relays Function(terminals)

A (65-66) (Trip signal of U0> stage)B (68-69) Trip signal of U0>> stageC (80-81) Information on trip of U0>>

stageD (77-78) Start signal of U0>> stageE (70-71-72) Self-supervision signalF (73-74-75) (Start signal of U0>stage)

The test procedure is the same as that of the low-set stage, but with the exception that when theoperate times are measured, the clock is stoppedvia contact 68-69 on the operation of outputrelay B.

The function of the IRF LED and the outputrelay E, when the self-supervision alarm signal isactivated, can be tested with the Trip test func-

tion described in the manual "General character-istics of C-type SPC relay modules". The opera-tion of output relay E is indicated by the L1 lamp.

Testing of self-supervisionoutput relay (IRF)

20

When used under the conditions specified inthe section "Technical data", the relay is practi-cally maintenance-free. The relay modules in-clude no parts or components sensitive to ab-normal physical or electrical wear under normaloperating conditions.

If the environmental conditions on site differfrom those specified, as to temperature andhumidity, or if the atmosphere around the relaycontains chemically active gases or dust, therelay should be visually inspected during therelay secondary testing. The visual inspectionshould focus on:

- Signs of mechanical damage to relay case andterminals

- Dust inside the relay cover or case; removecarefully by blowing compressed air

- Signs of corrosion on terminals, case or insidethe relay

If the relay fails in operation or if the operationvalues considerably differ from those mentionedin the relay specifications, the relay should begiven a proper overhaul. Minor measures can betaken by personnel from the customer’s instru-ment work-shop, but major measures involvingthe overhaul of the electronics are to be taken bythe manufacturer. Please contact the manufac-turer or his nearest representative for furtherinformation about checking, overhaul and cali-bration of the relay.

Note!The protection relays contain electronic circuitswhich are liable to serious damage due to elec-trostatic discharge. Before removing a module,ensure that you are at the same electrostaticpotential as the equipment by touching the case.

Note!Static protective relays are measuring instru-ments and should be handled with care andprotected against damp and mechanical stress,especially during transport.

Maintenanceand repair

Spare parts Residual voltage relay module SPCU 1C6Combined power supply and I/O module- Uaux = 80...265 V ac/dc SPTU 240 S1- Uaux = 18...80 V dc SPTU 48 S1Case (including I/O module) SPTK 1E11I/O module SPTE 1E11Bus connection module SPA-ZC 17_ or SPA-ZC 21_

Residual overvoltage relay without test adapter

SPAU 110 C RS 422 010 -AA, CA, DA, FA

Residual overvoltage relay with test adapter RTXP 18

SPAU 110 C RS 422 210 -AA, CA, DA, FA

The two last letters of the ordering number designate the rated frequency fnand the Uaux voltage range of the relay as follows:

AA correspond to fn = 50 Hz and Uaux = 80...265 V ac/dcCA correspond to fn = 50 Hz and Uaux = 18...80 V dcDA correspond to fn = 60 Hz and Uaux = 80...265 V ac/dcFA correspond to fn = 60 Hz and Uaux = 18...80 V dc

Orderingnumbers

21

Dimensions andinstructions formounting

The relay case is basically designed for flush-mounting. The mounting depth can be reducedby the use of a raising frame: type SPA-ZX 111reduces the depth behind the mounting panelby 40 mm, type SPA-ZX 112 reduces the depth

by 80 mm and type SPA-ZX 113 reduces thedepth by 120 mm. The relay can also be mountedin a case for surface mounting, type designationSPA-ZX 115.

Raising frame

SPA-ZX 111SPA-ZX 112SPA-ZX 113

176136 96

74114154

a b

a b

Panel cut-out

129 ±1

139

±1

142

162

136

3034

250

186216

Fig. 8. Dimensions of the residual overvoltage relay SPAU 110 C

The relay case is made of beige anodized alu-minium section.

A rubber gasket fitted on the mounting collarprovides an IP 54 degree of protection betweenrelay case and mounting panel, when the relay isflush mounted.

The hinged cover of the relay case is made of aclear, UV stabilized polycarbonate, and pro-

vided with a sealable fastening screw. A gasketalong the edge of the cover provides an IP54degree of protection between the case and thecover.

All input and output wires are connected to thescrew terminal blocks on the rear panel. Eachterminal is dimensioned for one max. 6 mm2

wire or two max. 2.5 mm2 wires. The D connec-tor is intended for serial communications.

22

Informationrequired withorder

1. Quantity and type designation 15 SPAU 110 C unit2. Order number RS 422 010 -AA3. Rated frequency fn = 50 Hz4. Auxiliary voltage Uaux = 110 V dc5. Accessories 15 bus connection modules SPA-ZC 21 MM

2 fibre optic cables SPA-ZF MM 10014 fibre optic cables SPA-ZF MM 5

6. Special requirements -

IRF

1310

[ ]s>t

0.5

0.05 1.0

50

10

0.5

0.05 1.0

2

10

20

STEP

RESET

SG1

0 1

12345678

>U >>U

SPCU 1C6

B

>>

[ ]s>>t

U o

nU>U o

nUUo 80

o o

[ ]%

[ ]%

U

STEP

SPCU 1C6Residual overvoltage relay module


2

SPCU 1C6Residual overvoltage

relay module

Contents Features .......................................................................................................................... 2Description of operation ................................................................................................. 3Block diagram................................................................................................................. 4Front panel ..................................................................................................................... 5Operation indicators ....................................................................................................... 5Settings ........................................................................................................................... 6Selector switches ............................................................................................................. 6Measured data................................................................................................................. 7Recorded information ..................................................................................................... 8Menu chart ..................................................................................................................... 9Technical data ............................................................................................................... 10Serial communication parameters ................................................................................. 11

Event codes .............................................................................................................. 11Data to be transferred over the serial bus ................................................................. 12

Fault codes .................................................................................................................... 15

Features Low-set residual overvoltage stage U0> withdefinite time operation characteristic, settingranges 2...20% x Un and 10...100% x Un

High-set residual overvoltage stage U0>> withdefinite time operation characteristic, settingranges 10...80% x Un or 2...16% x Un

The operation of the high-set residual over-voltage stage can be set out of function by se-lecting the setting ∞, infinitive

Effective suppression of harmonics of the inputenergizing voltages

Local display of measured and set values as wellas data recorded at the moment of a relay op-eration

Flexible selection of special operational featuresfor particular applications

Continuous self-supervision of hardware andsoftware. At a permanent fault the alarm out-put relay picks up and the other outputs areblocked.

1MRS 750509-MUM EN

Issued 96-12-02Version A (replaces 34 SPCU 2 EN1)Checked L-W UApproved TK


3

Description ofoperation

The residual overvoltage relay module typeSPCU 1C6 is used in a variety of different pro-tection relay units where it constitutes a non-directional general earth-fault protection mod-ule which measures the residual voltage of theelectrical power system.

The residual overvoltage module contains twoovervoltage stages,that is a low-set stage U0> anda high-set stage U0>>.

The low-set or high-set voltage stage starts ifthe measured voltage exceeds the set start valueof the stage concerned. When starting, the con-cerned stage delivers a starting signal SS1 or SS2and simultaneously the operation indicator ofthe stage is lit with yellow colour. If the over-voltage situation lasts long enough to exceed theset operation delay, the stage that started alsooperates generating a trip signal, TS1 alt. TS2.The operation indicator of the stage that oper-ated turns red. The start and operation indica-tors are provided with memory control, whichmeans that they can be given the self-reset orthe latching mode of operation. The latchingindicators are reset with the RESET push-but-ton on the front panel or by means of the com-mand V101 or V102 via the serial port.

The tripping of the low-set overvoltage stageU0> can be blocked by routing a blocking sig-nal BTS1 to the low-set stage. Similarly, the trip-ping of the high-set stage U0>> is blocked by ablocking signal BTS2. The blocking signals arerouted by means of switchgroup SGB on thePC board of the relay module.

The setting range of the operation time t> ofthe low-set overvoltage stage U0> is selected withswitches SG1/1 and SG1/2. Three setting rangesare available.

Switches SG1/7 and SG1/8 are used for select-ing the setting range for the operation time t>>of the high-set stage U0>>. Three setting rangesare available.

The setting range of the start value of the low-set stage U0> is selected with switch SG1/5. Twosetting ranges are available, that is 2...20% x Unand 10...100% x Un.

The setting range of the start value of the high-set stage U0>> is selected with switch SG1/6. Twosetting ranges are available, that is 2...16% x Unor 10...80% x Un.

The operation of the two operating stages isprovided with a so called latching facility, whichmeans that the operation output is kept alerted,although the signal which caused the operationdisappears. The latching function is selectedwith switch SG1/4. The latched output and theoutput relay can be reset in three different ways;(i) by pressing push buttons STEP and RESETsimultaneously, (ii) via the serial inter-face us-ing the command V101 or (iii) via the serialinterface using the command V102. When al-ternative (ii) is used all recorded information ismaintained but if the alternatives (i) or (iii) isused the recorded information is erased.

The residual voltage signal input is providedwith an effective filter by means of whichhamonics of the measured residual voltage issuppressed, see Fig. 1.

dB 10

0

-10

-20

-30

-40

-50

-600 1 2 3 4 5 6 7 f / fn

Fig. 1. Filter characteristics of the residual volt-age input circuit.

4

Block diagram

Fig. 2. Block schematic diagram of the residual overvoltage relay module SPCU 1C6.

U0 Measured residual voltageBS1, BS2, BS3 Incoming external blocking signalsBTS1 Blocking of tripping of stage U0>BTS2 Blocking of tripping of stage U0>>SG1 Selector switchgroup on the relay module front panelSG2 Function selector switchgroup for the operation indicatorsSGB Selector switchgroup on the PC board for blocking signalsSS1 Start signal of stage U0>TS1 Trip signal of stage U0>SS2 Start signal of stage U0>>TS2 Trip signal of stage U0>>Y Yellow indicator, startingR Red indicator, tripping

NOTE!All input and output signals of the relay mod-ule are not necessarily wired to the terminals ofevery protection relay unit utilizing this mod-

ule. The signals wired to the terminals are shownin the signal diagram in the manual of the con-cerned protection relay unit.

5

Front panel

Voltage measurement indicator

Start voltage setting knoband indicator of stage U0>

Operation time setting knoband indicator of stage U0>

Start voltage setting knob andindicator of stage U0>>

Operation time setting knoband indicator of stage U0>>

IRF

1310

[ ]s>t

0.5

0.05 1.0

50

10

0.5

0.05 1.0

2

10

20

STEP

RESET

SG1

0 1

12345678

>U >>U

SPCU 1C6

B

>>

[ ]s>>t

U o

nU>U o

nUUo 80

o o

[ ]%

[ ]%

U

STEP

Simplified device symbol

Self-supervision alarmindicator

Display for set andmeasured values

Display step push-button

Selector switchgroup

Switchgroup indicator

Reset push-button

Operation indicators

Relay module typedesignation

Fig. 3. Front panel of the residual overvoltage relay module SPCU 1C6.

Operationindicators

Both voltage stages have their own yellow/redLED indicators. Yellow light indicates startingof the concerned overvoltage stage and red lightindicates that the overvoltage stage has operated.

The four LED indicators can, independently ofone another, be given a non-latching or a latch-ing mode of operation. The latching modemeans that the indicator remains lit after beingswitched on, although the overvoltage stage,which controls the indicator, resets. If, for in-stance, the yellow start indicator is given thelatching mode and the red indicator the non-latching mode, the yellow indicator is lit, whenthe stage starts, which then turns red if and whenthe stage operates. When the overvoltage stageresets only the yellow indicator remains lit. Theindicators, which have been given the latchingmode, are reset locally by pushing the RESETpush-button or by remote control over the SPAbus using the command V102.

An unreset operation indicator does not affectthe protective functions of the relay module.

The self-supervision alarm indicator IRF indi-cates that the self-supervision system has de-tected a permanent internal relay fault. The in-dicator is lit with red light shortly after the faulthas been detected. At the same time the relaymodule puts forward a control signal to the self-supervision system output relay of the protec-tion relay unit.

Additionally, in most fault cases, a fault codeshowing the nature of the fault appears on thedisplay of the module. The fault code, consist-ing of a red number one (1) and a green three-digit code number, indicates what type of in-ternal fault that has been detected. When a faultmessage appears, the fault code should be noteddown for later use when relay overhaul or re-pair is to be carried out.

6

Settings The setting values are shown by the threerightmost digits of the display. A LED indica-

tor below the setting knob shows, when lit,which setting value is presented on the display.

U0>/Un Start voltage value of the U0> stage, expressed as a percentage of the rated voltageof the energizing input used. The setting range is 2...20% x Un when SG1/5 = 0,and 10...100% x Un when SG1/5 = 1.

t> [s] Operate time of the U0> stage, expressed in seconds. The setting range is deter-mined by the position of switches SG1/1 and SG1/2. Selectable operate time set-ting ranges 0.05...1.00 s, 0.5...10.0 s and 5...100 s.

U0>>/Un Start voltage value of the U0>> stage, expressed as a percentage of the rated voltageof the energizing input used. The setting range is 10...80% x Un when SG1/6 = 0,and 2...16% x Un when SG1/6 = 1. The setting ∞, infinite, (displayed as - - -) setsthe high-set stage U0>> out of operation.

t>> [s] Operate time of the U0>> stage, expressed in seconds. The required setting range,0.05...1.00 s, 0.5...10.0 s or 5.00...100 s, is selected with switches SG1/7 andSG1/8.

Further, the checksum of the selector switch-group SG1 is shown on the display when theLED indicator below the switchgroup is lit. Bymeans of the displayed checksum and thechecksum manually calculated the proper op-

eration of the switchgroup SG1 can be verified.An example of how the checksum is calculatedis shown in the manual "General characteristicsof C type relay modules".

Selector switches Additional functions required by individualapplications are selected by means of the func-tion selector switches of switchgroup SG1 lo-cated on the front panel. The numbering of the

switches, 1...8, as well as the switch positions 0and 1 are marked on the relay module frontpanel.

Switch Function

SG1/1 Selection of setting range for the operate time t> of low-set stage U0>.SG1/2

SG1/1 SG1/2 Operate time t>

0 0 0.05...1.00 s1 0 0.5...10.0 s0 1 0.5...10.0 s1 1 5...100 s

SG1/3 Not in use. Has to be set in position 0.

SG1/4 Selection of latching function for the tripping signals TS1 and TS2.

When SG1/4 = 0, the trip signals reset to the initial state (= the output relay drops off ),when the measuring signal causing the operation falls below the set start voltage level.When SG1/4 = 1, the trip signals remain activated (= the output relay remains pickedup), although the measuring signal falls below the set start voltage level. Then the tripsignals are reset by pressing the push-buttons STEP and RESET simultaneously orwith the commands V101 or V102 via the serial port.

SG1/5 Selection of setting range for the start voltage value of the low-set stage U0>.

When SG1/5 = 0, the setting range is 2...20% x Un.When SG1/5 = 1, the setting range is 10...100% x Un.

7

Switch Function

SG1/6 Selection of setting range for the start voltage value of the high-set stage U0>>.

When SG1/6 = 0, the setting range is 10...80% x Un and ∞, infinite.When SG1/6 = 1, the setting range is 2...16% x Un and ∞, infinite.

SG1/7 Selection of setting range for the operate time t>> of the high-set stage U0>>.SG1/8

SG1/7 SG1/8 Operate time t>>

0 0 0.05...1.00 s1 0 0.5...10.0 s0 1 0.5...10.0 s1 1 5...100 s

Switchgroup SG2 is a so called software switch-group, which is located in the third submenuof switchgroup SG1. The mode of operation,i.e. self-reset or manually reset, of the LED in-dicators U0> and U0>> is determined by theswitches of switchgroup SG2. The mode of op-

eration can be separately set for each indicator.The mode of operation is set by means of thechecksum, which can be calculated from thefollowing table. Normally the start indicationsare self-reset and the operation indicationsmanually reset.

Indicator Manually reset Factory default

Start indicator U0> 1 0Operation indicator U0> 2 2Start indicator U0>> 4 0Operation indicator U0>> 8 8

Checksum 15 10

The PC board of the relay module contains aswitchgroup SGB including switches 1...8. Theswitches 1...3 are used for selecting the startingsignals, whereas switches 4...8 are used for rout-ing the blocking signals to the voltage module

in various protection relay units. Instructionsfor setting of switchgroup SGB are given in theuser's manual of the different protection relayunits.

Measured data The measured values are displayed by the threerightmost digits on the display. The measured

data to be displayed are indicated by a lit LEDindicator.

Indicator Measured data

U0 Residual voltage measured by the relay module, expressed as a percentage of therated voltage of the energizing input used.

8

Recordedinformation

The leftmost red digit displays the addressnumber of the register, the rightmost three greendigits display the recorded data.

Register/ Recorded dataSTEP

1 Maximum residual voltage measured by the module, as a percentage of the ratedvoltage Un of the used energizing input. If the module operates, the voltage value atthe moment of operation is stored in the memory. Any new operation erases the oldvalue and updates the register with the new value. The same thing happens if themeasured voltage exceeds a previously recorded maximum value.

2 Number of starts of the low-set overvoltage stage U0>, n (U0>) = 0...255.

3 Number of starts of the high-set overvoltage stage U0>>, n (U0>>) = 0...255.

4 Duration of the latest start situation of stage U0> as a percentage of the set operatetime t>. Any new start resets the counter, which then starts counting from zero.When the stage has operated, the counter reading is 100.

5 Duration of the latest start situation of stage U0>> as a percentage of the set operatetime t>>. Any new start resets the counter, which then starts recounting from zero.When the stage has operated, the counter reading is 100.

0 Display of blocking signals and other external control signals. The rightmost digitindicates the state of the blocking inputs of the relay module. The following statesmay be indicated:0 = no blockings1 = operation of the U0> stage blocked2 = operation of the U0>> stage blocked3 = operation of both stages blocked

In this register the second digit from he right is constantly zero. The leftmost digitindicates the state of the remote reset control input, if applicable. The followingstates may be indicated:0 = remote reset control input not energized1 = remote reset control input energized

From this register it is possible to move on to the TEST mode, where the start andoperation signals of the module can be activated one by one. For further details seemanual "General characteristics of C type relay modules".

A The address code of the protection relay module in the serial communication sys-tem. The serial communication is broken if the relay module is given the addresscode 0 (zero). Register A is provided with the following subregisters:1. Selection of data transfer rate for the serial communication. Selectable values

300, 1200, 2400, 4800 and 9600 Bd. Default value 9600 Bd.2. Bus communication monitor. If the relay module is connected to a serial com-

munication system and the serial communication system is in operation the coun-ter of the bus communication monitor will show the value 0 (zero). If the com-munication is broken the numbers 0…255 are scrolling in the counter.

3. Password required when changing relay module settings via remote control

Registers 1...5 are set to zero by pressing thepush buttons STEP and RESET simultaneouslyor by remote control using the command V102.The register values are also erased if the auxil-iary power supply of the module is interrupted.The address code of the relay module, the set

data transfer rate of the serial communicationand the password are not erased by a supplyvoltage interruption. Instructions for setting theaddress code and the data transfer rate are givenin the manual "General characteristics of C typerelay modules".

9

Menu chart

Display off. Normal state SUBMENUFORWARD STEP 1 sBACKWARD STEP 0.5 s

MAIN MENU

STEP

BACKWARD

.5s

STEP FORWARD

1s

MAIN MENU SUBMENU

STEP 0.5 s RESET 1 s

0 000 SS1 TS1 TS2IRF SS2

Residual voltage U

Remotely setpercentage p1

Alerted start voltage, stage

Remotely set startvoltage x p1


Alerted operation time t>, stage

Remotely set ope-ration time t> x p2


Alerted start voltage, stage

Remotely set start voltage x p3


Alerted operation time t>>, stage

Remotely set ope-ration time t>> x p4

Alerted checksum,switchgroup SG1

Remotely set checksum of SG1

Remotely set checksum of SG1

Chechsumof SG2

Recorded maximum value of the residual voltage

Number of starts of the residual voltage stage

Number of starts of the residual voltage stage

Duration of the latest start event stage

1

2

3

4

Duration of the latest start event of stage 5

Incoming blocking signals0

Relay module address code

Data transfer rate (Bd)

Bus communication monitor 0 ... 255 Password A

= Value that can be set in the setting mode0

U >0

U >>0

U >0

U >>0

U 0

U >0

U >>0

U >0

U >>0

U >>0

U >0

Fig. 4. Main menu and submenus of the residual overvoltage relay module SPCU 1C6.

The procedure for entering a submenu or a set-ting mode and configuring the module is de-

scribed in detail in "General characteristics ofC type relay modules".

10

Technical data Low-set overvoltage stage U0>Start voltage U0> 2...20% x Un or 10...100% x UnStart time, typically 70 msOperate time 0.05...1.00 s, 0.5...10.0 s or 5...100 sReset time <100 msDrop-off/pick-up ratio, typically 0.96Operate time accuracy ±2% of set value or ±40 msOperation accuracy- 10...100% x Un ±3% of set value- 2...20% x Un ±5% of set value

High-set overvoltage stage U0>>Start voltage U0>> 10...80% x Un and ∞, infinite or

2...16% x Un and ∞, infiniteStart time, typically 70 msOperate time 0.05...1.00 s, 0.5...10.0 s or 5...100 sReset time <100 msDrop-off/pick-up ratio, typically 0.96Operate time accuracy ±2% of set value or ±40 msOperation accuracy- 10...80% x Un ±3% of set value- 2...16% x Un ±5% of set value

11

Serialcommunicationparameters

Event codes

The substation level control data communica-tor is able to read, over the SPA serial bus, theevent messages of the relay module, e.g. startand trip messages, from the residual overvoltagerelay module SPCU 1C6. The events can beprinted out in the format: time (ss.sss) and eventcode. The event codes of the relay module areE1...E8 , E50 and E51. Additional event codesrelating to the data communication are gener-ated by the data communication equipment.

The event codes E1...E8 and the events repre-sented by these can be included in or excludedfrom the event reporting by writing, via the SPAbus, an event mask (V155) to the relay module.The event mask is a binary number coded to adecimal number. The event codes E1...E8 arerepresented by the numbers 1, 2, 4...128. The

event mask is formed by multiplying the abovenumbers either with 0, event not included or 1,event included in reporting and by adding theproducts, see instructions for checksum calcu-lation.

The event mask may take a value within therange 0...255. The default value of the residualovervoltage relay module SPCU 1C6 is 85,which means that any start or operation eventis included in the reporting, but no resettings.The event codes E50...E54 and the events rep-resented by these cannot be excluded from thereporting.

Event codes of residual voltage relay moduleSPCU 1C6:

Code Event Weighting Defaultcoefficient setting

E1 Starting of stage U0> 1 1E2 Starting of stage U0> reset 2 0E3 Tripping of stage U0> 4 1E4 Operation of stage U0> reset 8 0E5 Starting of stage U0>> 16 1E6 Starting of stage U0>> reset 32 0E7 Tripping of stage U0>> 64 1E8 Operation of stage U0>> reset 128 0

Default value of event mask V155 85

E50 Restart of microprocessor * -E51 Overflow of event register * -E52 Temporary interruption in the data communication * -E53 No response from the relay module over the data

communication bus * -E54 The relay module responds again over the data

communication bus * -

0 not included in the event reporting1 included in the event reporting* no code number, always included in event reporting- cannot be set

NOTE!In the SPACOM system the event codes E52...E54 are generated by the station level controldata communicator, e.g. type SRIO 1000M.

12

Data to betransferred overthe serial bus

In addition to the event code data transfer, theinput data (I data), output data (O data), set-ting values (S), memorized data (V data) andsome other data can be read from the relay

module over the serial communication bus.Further, part of the data can be changed overthe SPA bus by separate commands. All datainformation is available in channel 0.

Data Code Data Valuesdirect.

Input data

Energizing input voltage I1 R 0...250% x UnBlocking of operation of stage U0> I2 R 0 = no blocking

1 = operation of stage U0>blocked

Blocking of operation of stage U0>> I3 R 0 = no blocking1 = operation of stage I0>>

blocked

Output data

Starting of stage U0> O1 R 0 = stage U0> not started1 = stage U0> started

Operation of stage U0> O2 R 0 = stage U0> not tripped1 = stage U0> tripped

Starting of stage Uo>> O3 R 0 = stage U0>> not started1 = stage U0>> started

Operation of stage U0>> O4 R 0 = stage U0>> not tripped1 = stage U0>> tripped

Setting values

Alerted start value of stage U0> S1 R 2...100% x UnAlerted operate time of stage U0> S2 R 0.05...100 sAlerted start value of stage U0>> S3 R 2...80% x Un

999 = ∞, infiniteAlerted operate time of stage U0>> S4 R 0.05...100 sAlerted checksum of switchgroup SG1 S5 R 0...255

Start value of stage U0>, S11 R 2...100% x Unset with the setting knobOperate time of stage U0>, S12 R 0.05...100 sset with the setting knobStart value of stage U0>>, S13 R 2...80% x Unset with the setting knob 999 = ∞, infiniteOperate time of stage U0>>, S14 R 0.05...100 sset with the setting knobChecksum of switchgroup SG1, S15 R 0...255set with the switches

Remotely setting percentage of the S21 R, W 0...999%start value of stage U0>Remotely setting percentage of the operate S22 R, W 0...999%time of stage U0> or time multiplierRemotely set percentage for the S23 R, W 0...999%start value of stage U0>>Remotely setting percentage for the S24 R, W 0...999%operate time of stage U0>>Remotely set checksum of switchgroup SG1 S25 R, W 0...255

13


Remotely set start value of stage U0> S31 R 2...100% x UnRemotely set operate time of stage U0> S32 R 0.05...100 sRemotely set start value of stage U0>> S33 R 2...80% x Un

999 = ∞, infiniteRemotely set operate time of stage U0>> S34 R 0.05...100 sRemotely set checksum of switchgroup SG1 S35 R 0...255

Max. measured voltage or voltage V1 R 0...250% x Unat operationNumber of starts of stage U0> V2 R 0...255Number of starts of stage U0>> V3 R 0...255Duration of the latest start V4 R 0...100%situation of stage U0>Duration of the latest start V5 R 0...100%situation of stage U0>>

Resetting of output relays and V101 W 1 = output relays andoperation indicators operation indicators resetResetting of output relays and operation V102 W 1 = output relays andindicators and erasing of recorded data operation indicators

reset and registers(codes V1…V5) erased

Remote control of settings V150 R, W 0 = setting with knobsS11...S15 activated

1 = remote settingsS31...S35 activated

Event mask word V155 R, W 0...255, see section"Event codes"

Manual reset or self-reset mode of V156 R, W 0…15, see sectionoperation of the LED indicators "Selector switches"

Opening of password for remote settings V160 W 1...999Changing or closing of password V161 W 0...999for remote settings

Activation of self-supervision function V165 W 1 = self-supervision outputis activated and the IRFindicator turns on inabout 5 seconds, where-after the self-supervisionsystem and the IRFindicator reset

Internal fault code V169 R 0…255

Data communication address of V200 R 1...254the relay module

Program version V205 R 070_

14


Type designation of the relay module F R SPCU 1C6

Reading of event register L R Time, channel numberand event code

Re-reading of event register B R Time, channel numberand event code

Reading of module status data C R 0 = normal state1 = module been subject

to automatic reset2 = overflow of event register3 = events 1 and 2 together

Resetting of module status data C W 0 = resetting

Time reading or setting T R, W 00.000...59.999 s

R = data to be read from the moduleW = data to be written to the module

The data transfer codes L, B, C and T have beenreserved for the event data transfer between therelay module and the control data communi-cator.

The event register can be read by the L com-mand only once. Should a fault occur, for ex-ample, in the data transfer, it is possible, by us-ing the B command, to re-read the contents ofthe event register once already read by means ofthe L command. When required, the B com-mand can be repeated.

The setting values S1...S5 are the alerted setvalues currently used by the protection relaymodule. These values are set either by remotecontrol or by means of the setting knobs. Thevalues S11...S15 are set with the setting knobsand the selector switches. Variables S21...S25are set as percentage values via remote control.

The settings S21...S25 allow reading or writ-ing. A condition for writing is that the pass-word V160, for remote setting has been opened.The variables S31...S35 contain the remote set-ting values.

When the values of the variables S21...S24 areto be changed, the variables can be given a per-centage factor within the range 0...999. It ispossible to alter a setting value beyond the set-ting ranges specified in the technical data of therelay module. However, the validity of the set-ting values are guaranteed only within the set-ting ranges specified in the technical data.

Activation of the self-supervision function(V165) prevents the relay module from operat-ing as long as the self-supervision output is ac-tivated and the IRF indicator is lit.

15

Fault codes Once the self-supervision system has detected apermanent relay fault, the IRF LED on the frontpanel of the module is lit, and at the same timethe normally operated signal relay of the self-supervision system drops off.

In most fault situations an auto-diagnostic faultcode is shown on the relay display. The faultcode cannot be reset. The fault code consists of

a red digit one (1) and a green code numberthat indicates the fault type. The fault codeshould be recorded and stated when service isordered.

The fault codes of the residual overvoltage relaymodule SPCU 1C6 are explained in the follow-ing table:

Fault code Explanation

4 Faulty output relay path or missing output relay card30 Faulty program memory (ROM)50 Faulty working memory (RAM)

195 Too low a value in reference channel with multiplier 1131 Too low a value in reference channel with multiplier 5

67 Too low a value in reference channel with multiplier 25203 Too high a value in reference channel with multiplier 1139 Too high a value in reference channel with multiplier 5

75 Too high a value in reference channel with multiplier 25253 No interruptions from the A/D-converter

L1 IRF

>I

L2I L3II

1309

[ ]sk

>t0.5

0.05 1.0

13

2.5

0.5

0.04 1.0

0.5

1.5

2.5

STEP

RESET

SG1

0 1

1234567820

STEP

>>I

nI>I

nI>>I

>>t [ ]s

>I >>I

SPCJ 3C3

B

Indicators for measured values

Setting knob 1with indicator

Stage 1



Stage 2


Self-supervision alarm indicator(Internal Relay Fault)

Display, 1 + 3 digits

Step push-button (STEP)

Programming switches SG1

Switchgroup indicator

Reset push-button (RESET)

Start/operation indicators

General characteristics ofC-type relay modules


2

General characteristics ofC-type relay modules

Contents Push-buttons .................................................................................................................. 2Programming switches SG1 ............................................................................................ 2Setting knobs .................................................................................................................. 3Display ........................................................................................................................... 3

Display main menu ................................................................................................... 3Display submenu ....................................................................................................... 4Setting mode ............................................................................................................. 4Example: Operation in setting mode ......................................................................... 5Stored information .................................................................................................... 6Trip-test mode........................................................................................................... 7Example: Trip-test function ...................................................................................... 8

Operation indicators ....................................................................................................... 9Fault codes ...................................................................................................................... 9

Push-buttons The front panel of the relay module containstwo push-buttons. The STEP button is used forstepping forward in the display and the RESETbutton for resetting the red indicators. Addi-tionally, the push-buttons are used for certain

settings, e.g. for setting the address of the relaymodule and the data transfer rate for the serialcommunication when the modules are used inrelay packages provided with this quality. (Seesection Display).

Programmingswitches SG1

Part of the settings and the selections of theoperating characteristics for the relay modulesin various applications are made with the pro-gramming switches SG1 on the front panel. Theindicator of the switchgroup glows when the

checksum of the switchgroup is shown on thedisplay. The checksum can be used for checkingthat the switches are properly set. Fig. 2 gives anexample of calculating the checksum.

Fig. 2. Example of calculating the checksum of programming switchgroup SG1.

When the checksum calculated according to theexample is equal to the checksum indicated onthe display of the relay module, the switches areproperly set.

The function of the programming switches ofthe individual measuring relay modules is speci-fied in the description of the module concerned.

1MRS 750328-MUM EN

Issued 96-02-19Version A (replaces 34 SPC 2 EN1)Checked L-W UApproved TK


3

Setting knobs Most of the operating values and operatingtimes are set by means of the setting knobs onthe front panel of the relay module. Each settingknob has its own (LED) indicator which glowswhen the concerned setting value is shown onthe display.

If a setting knob is turned while the display isshowing another measured or set value, thevalue being set automatically appears on thedisplay. Simultaneously, the indicator for theconcerned setting starts glowing.

In addition to the settings made with the settingknobs, most modules allow so called remotesetting. This means that the settings made bymeans of the setting knobs of the module andthe checksum of the programming switchgroupmay be altered through an instruction over theserial communication bus. Remote setting ispossible if the password in the register A isknown, and the remote settings are not acti-vated, i.e. parameter V150=0. The circumstancethat the remote settings are activated is shownwith a flashing light of the indicator of thesetting knob, the value of which currently isbeing displayed.

Display The measured and set values as well as the datarecorded are shown on the display of the meas-uring relay module. The display consists of fourdigits. The three digits (green) to the rightindicate the measured, set or stored value andthe digit at the extreme left (red) the number ofthe register. The measured or set value displayedis indicated by a yellow LED indicator. Thenumber of the register glows only when a storedvalue is displayed.

When the auxiliary voltage is connected to ameasuring relay module, the module initiallytests the display by stepping through the digits1...9 for about 15 seconds. When the test isfinished the display turns dark. The testing canbe interrupted by pressing the STEP button.The protective functions of the module areoperative throughout the testing.

Display main menu All the data required during normal operatingconditions are accessible from the main menuwhich presents the measured values in real-time,the normal setting knob settings as well as themost important memorized data.

The data to be shown in the main menu areselected to the display in a certain sequence bymeans of the STEP button. When pressing theSTEP button for about one second, the displaymoves forward in the display sequence. Whenpressing it for about 0.5 seconds, the displaymoves backwards in the display sequence.

From a dark display only forward movement ispossible. When keeping the STEP button de-pressed, the display is continuously moving inforward direction stopping for a while at thedark point.

Unless the display is switched off by stepping tothe dark point, it remains activated for about 5minutes from the last pressing of the STEPbutton and then goes out.

4

Display submenu Less important values and values not very oftenset are displayed in the submenus. The numberof submenus varies with different relay moduletypes. The submenus are presented in the de-scription of the concerned module.

A submenu is entered from the main menu bypressing the RESET button for about one sec-ond. When the button thereafter is released, thered digit (STEP) of the display starts flashing,indicating that one is in a submenu. Going fromone submenu to another or back to the mainmenu follows the same principle as when mov-ing from the main menu display to another; the

display moves forward when pressing the STEPbutton for one second and backward whenpressing it for 0.5 seconds. The return to themain menu has taken place when the red STEPdisplay turns dark.

When entering a submenu from a measured orset value indicated by a LED indicator, theindicator remains glowing and the address win-dow (STEP) of the display starts flashing. Aflashing address window when no LED indica-tor is lit indicates that the submenu of a registerhas been entered.

Fig. 3. Example of the main and submenus for the settings of the overcurrent relay module SPCJ3C3. The settings made with the setting knobs are in the main menu and they are displayed bypressing the STEP button. In addition to the setting knob settings the main menu contains themeasured current values as well as the registers 1…5, as well as 0 and A. The remote settingpercentage and remote setting value are located in the submenus for the settings and are activatedon the display by pressing the RESET button.

Setting mode The registers of the main menu and the submenusalso contain parameters to be set. The settingsare made in the so called setting mode, which isaccessible from the main menu or a submenu bypressing the RESET button, until the digit atthe extreme right starts flashing (about 10 s).The flashing digit is set by means of the STEPbutton. The flashing is moved on from digit todigit by pressing the RESET button.

A set value is stored in the memory by pressingthe push-buttons STEP and RESET simultane-ously. In practice the RESET button must be

pressed slightly in excess of the STEP button.Return from the setting mode to the main menuor submenu is possible by pressing (for about 10s) the RESET button until the green digits onthe display stop flashing. If the module is left inthe setting mode, it will return automatically tothe start condition after about 5 minutes.

The values to be set in the setting mode are forinstance the address code of the relay moduleand the data transfer rate for the serial commu-nication. Further the percentage values for theremote settings can be changed.

5

Example 1: Function in the setting mode. Manual setting ofthe address code of a relay module and the datatransfer rate for the serial communication. Theinitial value for the address code is 146.

a)Press push-button STEP until register address Aappears on the display.

b)Press the RESET button for about 10 s until theright most digit starts flashing.

c)Press the STEP button repeatedly to set the digitto the value desired.

d)Press the RESET button to make the middle ofthe green digits flash.

e)Set the middle address digit by means of theSTEP button.

f)Press the RESET button to make the left mostgreen digit flash.

g)Set the digit by means of the STEP button.

h)Store the set address number in the memory ofthe relay module by pressing the RESET andSTEP button simultaneously. At the momentthe information enters the memory, the threegreen dashes flash in the display, i.e. A—.

i)Leave the setting mode by pressing the RESETbutton for about 10 s, until the display stopsflashing.

j)Then enter submenu 1 of register A by pressingthe RESET button for approx. one second. Theregister address A is then replaced by a flashing1. This submenu is used for setting the datatransfer rate of the serial communication.

k)The data transfer rate for the serial communica-tion is set and stored in the same way as theaddress, see sections b...i, except that the con-tinuously glowing register address has been re-placed by a flashing 1.

l)After storing the data transfer rate for the serialcommunication you may return to the mainmenu of register A by pressing the STEP buttonfor about 0.5 second.

6

Stored information The parameter values measured at the momentwhen a fault occurs are recorded in the registers,in some modules also the setting values. Therecorded data, except for some setting param-eters, are set to zero by pressing the push-buttons STEP and RESET simul-taneously.The data in normal registers are erased if theauxiliary voltage supply to the relay is disrupted,only the set values and the number ofautoreclosings are maintained in the registers ata voltage failure.

The number of the registers varies with differentmodule types. The function of the registers areillustrated in the descriptions of the separaterelay modules. Additionally, the system panelcontains a simplified list of the data recorded bythe various relay modules of the relay assembly.

All C-type relay modules are provided with twogeneral registers: register 0 and register A.

Register 0 contains, in coded form, the informa-tion about e.g. external blocking signals andstatus information for the circuit breaker. Thecodes are explained in the descriptions of therelay modules.

Register A contains the address code of the relaymodule as required by the serial communicationsystem. Example 1 on page 4 shows how theaddress code is altered. Submenu 1 of register Acontains the data transfer rate value expressed inkilobaud for the serial communication.

Submenu 2 of register A contains a bus trafficmonitor for the SPACOM system. If the protec-tive relay, which contains the relay module, islinked to a system including the control datacommunicator and the data communicationsystem is operating, the counter reading of themonitor will be zero. Otherwise the digits 1...255are continuously rolling in the monitor.

Submenu 3 contains the password required forchanging the remote settings. The address code,the data transfer rate for the serial communica-tion and the password can be set manually or viathe serial communication bus. For manual set-ting see example 1.

The start value for the address code and thepassword is 001 and that for the data transferrate 9.6 kilobaud.

7

Trip-test mode Register 0 also allows access to the so calledTrip-test function, which allows the outputsignals of the relay module to be activated one byone. If the auxiliary relay module of the protec-tion assembly is in place, the auxiliary relays willbe included in the testing.

When pressing the RESET button for about 10seconds, the three green digits to the right startflashing to indicate that the relay module is intest position. The indicators of the setting knobsindicate by flashing which output signal can beactivated. The required output function is se-lected by pressing the RESET button for about1 second, until the following LED indicatorstarts flashing.

The indicators of the setting knobs refer to thefollowing output signals:Setting knob 1 SS1 Starting of stage 1Setting knob 2 TS1 Tripping of stage 1Setting knob 3 SS2 Starting of stage 2Setting knob 4 TS2 Tripping of stage 2No indication IRF Self-supervision

The selected starting or tripping is activated bysimultaneous pressing of the push-buttons STEPand RESET. The signal remains activated aslong as the two push-buttons are being pressed.

The self-supervision output is activated by press-ing the STEP button once when no setting knobindicator is flashing. The IRF output is acti-vated in about 5 seconds after pressing of theSTEP button, and resets after that. Simultane-ously, the display returns to the main menu andperforms the initial testing indicated by rollingdigits 0...9 in the display several times.

The signals are selected in the order illustrated infig. 4.

REGISTER 0IRF SS1 TS1 SS2 TS2

STEP STEP+RESET

STEP+RESET

STEP+RESET

STEP+RESET

RESET10 s

RESET1 s

RESET1 s

RESET1 s

RESET1 s

RESET1 s

Fig. 4. Sequence order for selecting the output signals in the Trip-test mode.

If e.g. the indicator of the setting knob 2 (secondfrom the top) is flashing, and the push-buttonsSTEP and RESET are being pressed, the signalTS1 (tripping of stage 1) is activated. Return tothe main menu is possible at any stage of the

Trip-test sequence scheme, by pressing theRESET button for about 10 seconds. If themodule is left in the Trip-test mode, it willreturn automatically after approx. 5 minutes.

8

Example 2: Trip-test function. Forced activation of the out-puts is made as follows:

a)Step forward on the display to register 0.

b)Press the RESET button for about 10 secondsuntil the three green digits to the right and theLED indicator of the uppermost setting knobstart flashing.

c)Press the push-buttons RESET and STEP si-multaneously. Then the starting of stage 1 (e.g.the I>-stage of the overcurrent module SPCJ3C3) is activated and, simultaneously, the indi-cator of the stage starts glowing yellow.

d)Press the RESET button for about 1 seconduntil the indicator of the second setting knobstarts flashing.

e)Press the push-buttons RESET and STEP si-multaneously to activate tripping of stage 1 (e.g.the I>-stage of the overcurrent module SPCJ3C3). The indicator of the concerned stagestarts glowing red.

f)Starting and tripping of the second stage isactivated in the same way as stage 1. The indica-tor of the third or fourth setting starts flashing toindicate that the concerned stage has been acti-vated.

g)To activate the self-supervision output step to-wards the test position, where no indicator isflashing. Press the STEP button once. In about5 seconds the red IRF indicator starts glowingand the IRF output is activated. Shortly thereaf-ter the indicator goes out and the output auto-matically resets. At the same time the moduleleaves the test position.

h)It is possible to leave the trip test mode at anystep of the sequence scheme by pressing theRESET button for about 10 seconds until thethree digits to the right stop flashing.

9

Operationindicators

A measuring relay module is provided with twoseparate operating stages, each of which with itsown yellow/red operation indicator on the lowerpart of the front plate of the relay module.

The operation indicator starts glowing yellowwhen the operating stage starts and red when adelayed tripping operates. The functions of thestart and operation indicators are described indetail in the different protection relay modulemanuals.

Fault codes In addition to the protective functions the relaymodule is provided with a self-supervision sys-tem which continuously supervises the functionof the microprocessor, its program executionand the electronics.

When the self-supervision system has detected apermanent fault in the relay module, the redIRF indicator on the panel starts glowing soonafter the fault was discovered. At the same timethe module puts forward a signal to the self-supervision contact of the relay assembly.

In most fault situations a fault code, indicatingthe nature of the fault, appears on the display ofthe module. The fault code, which consists of ared digit (1) and a three digit green code number,cannot be removed from the display by reset-ting. When a fault occurs, the fault code shouldbe recorded and stated when service is ordered.

1MR

S 7

5060

7-M

UM

E

N

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spau 110 c residual overvoltage relay - abb...- module sptu 240 s1 u aux = 80...265 v ac/dc - module...

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