MiCOM P342, P343Generator Protection Relays

MiCOM P342, P343Generator Protection

Relays

T&DProtection & Control

2

MiCOM P342, P343Generator Protection Relays

IntroductionThe MiCOM generator protectionrelays provide flexible and reliableintegration of protection, control,monitoring and measurementfunctions. Extensive functionality isavailable to provide completeprotection and control with twomodels for a wide range ofapplications, covering mostinstallations from small generatorsup to sophisticated systems.

Protection• Generator differential (P343 only)

• 100% stator earth fault(P343 only)

• Non-directional phase overcurrent

• Non-directional earth fault

• Neutral displacement/residualovervoltage

• Sensitive directional earth fault

• Restricted earth fault

• Voltage dependent overcurrent/underimpedance

• Under/overvoltage

• Under/overfrequency

• Reverse power/low forwardpower/overpower

• Loss of field

• Negative phase sequencethermal

• Overfluxing

• Unintentional energisation atstandstill (P343 only)

• 10 RTDs (option)

• Circuit breaker failure

• Voltage transformer supervision

• Current transformer supervision

Control• Programmable scheme logic

• Programmable optically isolatedinputs and relay outputs

• Multiple settings groups

Measurements• Comprehensive measurement

values

• Instantaneous

• Integrated

Post Fault Analysis• Event and fault records

• Disturbance records

Monitoring• Trip circuit monitoring

• Breaker state monitoring

• Breaker condition monitoring

• Temperature monitoring

Communications• A choice of protocols

• Front and rear communicationports

Diagnostics• Power-up diagnostics

• Continuous self monitoring

• Test facilities

User Friendly Interface• Liquid crystal display with

backlight

• Programmable LED indications

• Password protection

• Optional secondary cover

• Fully programmable menu text

Software SupportAvailable in conjunction withMiCOM S1 support software:

• Settings editor

• Programmable scheme logiceditor

• Viewing of fault diagnostics andmeasurements

• Disturbance recorder viewer

• Fully programmable menu text

ApplicationThe MiCOM P342 is suitable forprotection of generators whichrequire cost effective high qualityprotection.

Protection includes overcurrent,earth fault, neutral displacement,sensitive or restricted earth fault,voltage dependent overcurrent orunderimpedance, under andovervoltage, under andoverfrequency, reverse, low forwardor overpower, field failure, negativephase sequence thermal andoverfluxing, as well as VT and CTsupervision. Figure 2a shows an LVapplication with a solidly earthedsystem.

Figure 1: MiCOM P342

3

The MiCOM P343 is suitable forprotection of larger or moreimportant generators, providinggenerator differential, 100% statorearth fault and unintentionalenergisation at standstill in additionto the features of the P342.Figure 2b shows a MiCOM P343application with a resistanceearthed generator.

Protection FunctionsThree phase generator differentialprotection is provided to detectstator phase faults. This can be setas either a percentage bias schemewith a dual slope characteristic oras a high impedance scheme.

Three phase tripping with faultedphase indication is provided for allprotection functions.

Generator differential(P343 only)Three phase generator differentialprotection is provided to detectstator phase faults. This can be setas either a percentage bias schemewith a dual slope characteristic oras a high impedance scheme.

100% stator earth fault(P343 only)Third harmonic neutral undervoltageprotection covers the final 15% ofthe stator winding and, inconjunction with the other earth faultelements, provides 100% earth faultprotection for the stator. This issupervised by a three phaseundervoltage element.

Phase overcurrentTwo independent stages areavailable for each phaseovercurrent. Both stages havedefinite time (DT) delayedcharacteristics, the first stage mayalso be independently set to one ofnine inverse definite minimum time(IDMT) curves (IEC and IEEE).

Standard earth faultThe standard earth fault elementoperates from an earth fault inputconnection to measure the faultcurrent in the earth path of thegenerator.

Two independent stages areavailable for each phase

overcurrent. Both stages havedefinite time (DT) delayedcharacteristics, the first stage mayalso be independently set to one ofnine inverse definite minimum time(IDMT) curves (IEC and IEEE).

Sensitive earth faultA core balance CT should be usedto drive the sensitive earth faultfunction. The directionality isprovided by the residual voltage.

WattmetricThe sensitive earth fault protection isalso suitable for Petersen Coilearthed systems by enabling awattmetric element. This form ofprotection uses the sensitive earth

fault protection directionalcharacteristic, but with a directionalresidual power threshold providingan additional constraint onoperation.

Restricted earth faultThe restricted earth fault protectionmay be configured as either highimpedance or low impedancebiased differential.

Figures 2a and 2b

VTS Voltage transformer supervision27/59 Under/overvoltage81O/81U Under/overfrequency24 Overfluxing87G Generator differentialRTD 10 resistance thermal devicesCTS Current transformer supervision50/51 Non-directional phase overcurrent51V/21 Voltage dependent overcurrent/

underimpedance32R/32L/32O Reverse power/low forward power/

overpower40 Loss of field46 Negative phase sequence50/27 Unintentional energisation at standstill64/67N Restricted earth fault/sensitive earth fault50N\51N Non-directional earth fault27TN 100% stator earth fault59N Residual overvoltage/neutral displacement67N Sensitive earth fault

Figure 2a: MiCOM P342

Figure 2b: MiCOM P343

2759

81O81U 24

51V21

VTS

RTD

5051CTS

32R32L32O

40 46

50N51N 64

2759

81O81U 24

51V21

VTS

RTD

5051CTS

32R32L32O

40 46

50N51N

87G

5027

64

27TN 59N

4

Voltage dependentovercurrent/underimpedanceIn order to provide backupprotection for phase faults, anelement is included which can beset as either voltage controlledovercurrent, voltage restrainedovercurrent or underimpedance.

If selected as voltage controlled orvoltage restrained overcurrent, thetiming characteristic can be set aseither definite time or IDMT.

If selected as underimpedance, athree phase non-directionalunderimpedance element isprovided.

Neutral displacement/residualovervoltageResidual overvoltage protection isavailable for detecting earth faultswhere there is an isolated or highimpedance earth. The residualvoltage can be measured from abroken delta VT, from the secondarywinding of a distribution transformerearth at the generator neutral, orcan be calculated from the threephase to neutral voltagemeasurements.

Two independent stages ofprotection are provided, each canbe set with a definite time delay andone stage can be configured tohave an inverse time characteristic.

Under/overvoltageUnder/overvoltage protection maybe configured to operate from eitherphase-phase or phase-neutralvoltage elements. Two independentstages with definite time elementsare available. The first stage canalso be configured to an inversecharacteristic.

Under/overfrequencyTwo independent stages ofoverfrequency and four of underfrequency are provided. Each stagefunctions as a definite time element.

Power protectionThe power protection elementprovides two stages which may beindependently configured to operateas reverse power, over power orlow forward power protection.These can be used to provide simpleoverload protection, protection

against motoring and/or CBinterlocking to prevent overspeedingduring machine shutdown.

Loss of fieldTo detect failure of the machineexcitation a two stage offset mhoimpedance element is provided.This allows a small instantaneouscharacteristic to be used to providefast tripping for loss of excitation athigh power outputs, where systemstability could be affected.The second stage can be set with alarger time delayed characteristic toprovide stable, secure trippingunder low power conditions.

Integrating timers are provided toenable the impedance characteristicto provide time delayed poleslipping protection.

A power factor alarm element isalso available to offer more sensitiveprotection for unusual operatingconditions, for example a lightlyloaded unit operating as aninduction generator.

Negative phase sequenceTo protect against unbalanced statorcurrents caused by external faults orunbalanced loading, two stages ofnegative sequence protection areprovided. These comprise a definitetime alarm stage and a trip stagethat operates with a thermalcharacteristic.

OverfluxingTo protect the generator, orconnected transformer, againstoverexcitation a two stage V/Hzelement is provided. The first stageis a definite time alarm, the secondstage can be used to provide aninverse/definite time tripcharacteristic.

Unintentional energisation atstandstill (P343 only)If the machine circuit breaker isclosed accidentally, when themachine is not running, very highcurrent will result. A voltagesupervised overcurrent scheme isavailable to protect against thiscondition. When the machinevoltage is low, that is, the machineis not running, an instantaneousovercurrent element is enabled.

Timers ensure that the element willbe stable for normal voltage dipsthat could occur for system faults ormachine reconnection.

Resistance temperaturedevices (RTDs)In order to monitor temperatureaccurately, an option allowingmeasurement of temperatures usingup to 10 platinum RTDs is available.This provides an instantaneousalarm and time-delayed trip outputfor each RTD.

Blocked overcurrent logicEach stage of overcurrent and earthfault protection can be blocked byan optically isolated input.This enables the overcurrent andearth fault protection to beintegrated into a blockedovercurrent busbar protectionscheme.

Supervisory FunctionsCircuit breaker failureprotectionTwo stage circuit breaker failureprotection may be used for trippingupstream circuit breakers and/orthe local secondary trip coil.

The circuit breaker failure logic mayalso be initiated externally fromother protection devices if required.

Voltage transformersupervisionVoltage transformer supervision(VTS) is provided to detect loss ofone, two or three VT signals,providing indication and inhibitionof voltage dependent protectionelements.An optically isolated input may alsobe configured to initiate the voltagetransformer supervision alarm andblocking when used with miniaturecircuit breakers (MCBs) or otherexternal forms of voltagetransformer supervision.

Current transformersupervisionCurrent transformer supervision(CTS) is provided to detect loss ofphase CT signals and inhibit theoperation of current dependentprotection elements.

5

ControlProgrammable scheme logicProgrammable scheme logic allowsthe user to customise the protectionand control functions. It is also usedto programme the functionality ofthe optically isolated inputs, relayoutputs and LED indications.

The programmable scheme logiccomprises gate logic and generalpurpose timers. The gate logicincludes OR, AND and majoritygate functions, with the ability toinvert the inputs and outputs, andprovide feedback. The system isoptimised to evaluate changes to thescheme logic signals and thusminimise any delays in logicexecution.

The programmable scheme logicmay be configured using thegraphical MiCOM S1 PC basedsupport software, as illustrated inFigure 3.

The required logic is drawn asshown and is then downloadeddirectly into the relay. The logic mayalso be uploaded from the relayand then modified usingMiCOM S1 support software.

Independent protectionsettings groupsThe settings are divided into twocategories; protection settings andcontrol and support settings.Four setting groups are provided forthe protection settings to allow fordifferent operating conditions andadaptive relaying.

Measurement andRecording FacilitiesThe P340 series is capable ofmeasuring and storing the values ofa wide range of quantities.All events, fault and disturbancerecords are time tagged to aresolution of 1ms using an internalreal time clock. An optional IRIG-Bport is also provided for accuratetime synchronisation.

A lithium battery provides a back-upfor the real time clock and allrecords in the event of supplyfailure. This battery is supervisedand is easily replaced from the frontof the relay.

MeasurementsThe measurements provided, whichmay be viewed in primary orsecondary values, can be accessedby the back-lit liquid crystal display,or the communications ports.Phase notation is user definableusing the MiCOM S1 text editor.

Instantaneous measurementsPhase voltages Van Vbn Vcn

Line voltages Vab Vbc Vca

Neutral voltage Vn

Phase current Ia1 Ib1 Ic1Ia2 Ib2 Ic2

Neutral currents In ISEF

Sequence currents and voltages

Frequency

Single and three phase power factor

Active power Wa Wb WcWtotal

Reactive power VAra VArb VArcVArtotal

Apparent power VAa VAb VAcVAtotal

Bias current Iabias IbbiasIcbias

Differentialcurrent Iadiff Ibdiff Icdiff

3rd harmonicneutral voltage Vn3

Temperature RTD1 …RTD10

Phase currents and phase to neutralvoltages are available in true rmsand fundamental quantities.

Integrated valuesWh VArh

Peak, average and rolling demand:

Ia Ib Ic

W VAr

Post Fault AnalysisEvent recordsUp to 250 time-tagged eventrecords are stored in non-volatilememory, and can be extracted usingthe communication ports or viewedon the front panel display.

Fault recordsRecords of the last 5 faults arestored in non-volatile memory.The information provided in the faultrecord includes:

Indication of faulted phase

Protection operation

Active setting group

Relay and CB operating time

Current, voltage, power andfrequency

Fault duration

Temperatures

Figure 3: Programmable scheme logic editor (MiCOM S1)

6

Disturbance recordsThe internal disturbance recorderhas 8 analogue channels, 32 digitaland 1 time channel. Data issampled 12 times a cycle andtypically 20 disturbance records,each of up to 10.5 secondsduration are stored in non-volatilememory. All channels and thetrigger source are user configurable.Disturbance records can beextracted from the relay via theremote communications and savedin the COMTRADE format.These records may be examinedusing MiCOM S1 or any suitablesoftware program.

Plant SupervisionTrip circuit monitoringMonitoring of the trip circuit in bothbreaker open and closed states canbe realised using the programmablescheme logic.

Circuit breaker statemonitoringAn alarm will be generated if thereis a discrepancy between the openand closed contacts of the circuitbreaker.

Circuit breaker conditionmonitoringThe circuit breaker conditionmonitoring features include:

• monitoring the number of breakertrip operations

• recording the sum of the brokencurrent quantity ∑Ix, 1.0≤ x ≤2.0

• monitoring the breaker operatingtime

• monitoring the fault frequencycounter

Local and RemoteCommunicationsTwo communication ports areavailable; a rear port providingremote communications and a frontport providing localcommunications.

Remote communicationsThe remote communications arebased on RS485 voltage levels.Any of the protocols listed belowcan be chosen at the time ofordering.

Courier/K-BusThe Courier language is a protocolwhich has been developedspecifically for the purpose ofdeveloping generic PC programsthat will, without modification,communicate with any device usingthe Courier language.

ModbusModbus is a master/slave protocol,whereby the master must haveknowledge of the slave’s databasesand addresses. The Modbusimplementation supported by theMiCOM P340 series is RTU mode.

IEC 60870-5-103The relay is compliant with thetransmission protocol defined by thespecification IEC 60870-5-103.The standarised messages based onthe VDEW communication protocolare supported.

DNP 3.0The DNP 3.0 protocol is definedand administered by the DNP UserGroup. The relay operates as aDNP 3.0 slave and supports subsetlevel 2 of the protocol plus some ofthe features from level 3.

Local communicationsThe front serial communications porthas been designed for use withMiCOM S1, which fully supportsfunctions within the relay byproviding the ability to program thesettings off-line, configure theprogrammable scheme logic, extractand view event, disturbance andfault records, view the measurementinformation dynamically andperform control functions. PAS&Tcan also be used with the localcommunications port.

DiagnosticsAutomatic tests performed includingpower-on diagnostics andcontinuous self-monitoring ensure ahigh degree of reliability. The resultsof the self-test functions are stored in

non-volatile memory. Test featuresavailable on the user interfaceprovide examination of inputquantities, states of the digital inputsand relay outputs. A local monitorport providing digital outputs,selected from a prescribed list ofsignals, including the status ofprotection elements, may be used inconjunction with test equipment.These test signals can also beviewed using the Courier andModbus communications ports.

Hardware DescriptionAll models within the MiCOM P340series include;

• A back-lit liquid crystal display

• 12 LEDs

• An optional IRIG-B port

• An RS232 port

• An RS485 port

• A download/monitor port

• A battery (supervised)

• N/O and N/C watchdogcontacts

• Supervised +48V field voltage

• 1A/5A dual rated CTs

The hardware variations betweenthe P342 and P343 are:

P342 P343

100 – 120V or380 – 480V VTs 4 4

CTs 5 8

Optically isolatedinputs 8 16

Relay output 3N/O 6N/O4C/O 8C/O

RTDs 10 10

The optically isolated inputs, relayoutputs and 8 of the LEDs arepreconfigured as a default, but maybe programmed by the user.The optically isolated inputs areindependent and may be poweredfrom the +48V field voltage.The relay outputs may be configuredas latching or self reset. All CTconnections have integral shorting.

A system overview of the MiCOMP343 is shown in Figure 4.

7

Figure 4: MiCOM P343 system overview(not intended for wiring purposes, refer to external connection diagram 10 P343 01 for connection details)

E1

E2

E3

5A

1A

IA(2)

50P 50N 51P

51N 67N64 46

50BF

See note 1

Watchdog

IRIG-B

RS232

RS485

Measurements

kA, kV, HzkW, kVA, kVArskWh, kVArhSequence componentsThermal stateTemperature

1 4 0 0

250Eventrecords

IN > 1 Start ON

20Disturbancerecords

Fault A-B-C 15msIa = 1000 AIb = 1000 AIc = 1000 A

Programmable scheme logic

Breakermonitoring

No. trips = 100SUM I2 = 1000 kACB opt time = 100 ms

5Faultreports

52

+

+

Courier

CourierModbusIEC60870-5-103LEDs

See note 2

00:12:00 01/01/99

00:12:01 01/01/99Trip A B C ON

+

D2D1D4D3D6D5D8D7D10D9D12D11D14D13D16D15

F2F1F4F3F6F5F8F7F10F9F12F11F14F13F16F15

RL7

RL6

RL5

RL4

RL3

RL2

RL1

User programmble

J8J10

48V field voltage

J7J9 48V field voltage

J14J13J12J11 Relay failed

Relay healthy

H1H2H3H4H5H6H7H8H9H10H11H12H13H14H15H16H17H18

Auxiliary voltage

See note 3

J2

J1

& &1

1

CTS

C23

C24

L1 Setting group

L2 Setting group

L3 Block IN>2

L4 BlockI>2

L5 Reset

L6 Ext prot trip

L7 52a

L8 52b

L9 Not used

L10 Not used

L11 Not used

L12 Not used

L13 Not used

L14 Not used

L15 Not used

L16 Not used

Userprogrammable(defaults shown)

Userprogrammable(defaults shown)

Userprogrammable(defaults shown)

R1 Trip CB

R2 Trip PrimeMov

R3 Any trip

R4 General alarm

R5 CB fail

R6 E/F trip

R7 Volt trip

ANSI NumbersInstantaneous phase overcurrentInstantaneous neutral overcurrentTime delayed phase overcurrentTime delayed neutral overcurrentSensitive earth fault/restricted earth faultNegative phase sequenceBreaker failure and backtripCurrent transformer supervision

50P50N51P51N67N/644650BFCTS

Voltage controlled overcurrentUnderimpedance100% stator earth faultUndervoltageOvervoltageOver/underfrequencyReverse/low forward/over powerOverfluxing

51V2127TN2759813224

Note 1: All CT connectors have integral shorting.These contacts are made before the internalCT circuits are disconnected.

Note 2: 1A CT connections shown.

Note 3: The bridge rectifier is not present on the24 – 48V dc version.

RL14

RL13

RL12

RL11

RL10

RL9

RL8 G1G2G3G4G5G6G7G8G9G10G11G12G13G14G15G16G17G18

Userprogrammable(defaults shown)

R8 Freq trip

R9 Diff trip

R10 SysBack trip

R11 NPS trip

R12 FFail trip

R13 Power trip

R14 V/Hz trip

B1B2B3

RTD 1

B28B29B30

RTD 10

Optional10 RTDs

49T

38

26

Timesynchronisation

87G

27 59 81

51V 21

32

27TN

24 40

5027 VTS 59N

E4

E5

E6

5A

1A

IB(2)

E7

E8

E9

5A

1A

IC(2)

C13

C14

C15

5A

1AINSensitive

C22

C19

C20

C21

C1

C2

C3

5A

1AC4

C5

C6

5A

1AC7

C8

C9

5A

1A

C10

C11

C12

5A

1A

VN

VA

VB

VC

IA

IB

IC

Loss of fieldUnintentional energisation at standstillVoltage transformer supervisionGenerator differentialResidual overvoltageField winding temperatureBecering temperatureStator winding temperature

4050/27VTS87G59N263849

J17

J18

8

User InterfaceThe front panel user interfacecomprises:

(1) A 2 x 16 character back-litliquid crystal display.

(2) Four fixed function LEDs.

(3) Eight user programmable LEDs.

(4) Menu navigation and data entrykeys.

(5) “READ” and “CLEAR” Ckeys for viewing andacknowledging alarms.

(6) An upper cover identifying theproduct name. The cover maybe raised to provide access tothe product model number,serial number and ratings.

(7) A lower cover concealing thefront RS232 port, down load/monitor port and batterycompartment. The front of thecover can display the name ofthe product or any user definedname.

(8) Facility for fitting a security leadseal.

The user interface and menu text areavailable in English, French,German and Spanish as standard.Labels supplied with the deviceallow customised descriptions of theLEDs. A user selectable defaultdisplay provides measurementinformation, time/date, protectionfunctions and plant referenceinformation. The ability to customisethe menu text and alarmdescriptions is also supported.

Password protectionPassword protection may beindependently applied to the frontuser interface, front communicationsport and rear communications port.Two levels of password protectionare available providing access tothe controls and settingsrespectively.

Protection SettingRangesGenerator differentialMode Percentage bias/

high impedance

Is1 0.05In to 0.5In

k1 0 to 20%

Is2 1In to 5In

k2 20 to 150%

100% stator earth fault• 3rd harmonic undervoltage

0.3 to 20V (100 – 120V)1.2 to 80V (380 – 480V)

• Vph-ph< inhibit

30 to 120V (100 – 120V)120 to 480V (380 – 480V)

Unintentional energisation atstandstill• I> 0.08 to 4In

• Vph-ph<10 to 120V (100 – 120V)40 to 480V (380 – 480V)

• Definite time 0 to 10s

• Drop-off timer 0 to 10s

Figure 5: User interface

61

3

5

4

87

2

9

Figure 6: IEC and IEEE/ANSI IDMT curves

UK LTI

IEC SI

IEC VI

IEC EI

1000

100

10

1

0.1100101

Current (Multiples of Is)

Ope

ratin

gtim

e (s

)

IEEE MIIEEE VI

IEEE EIUS CO8

US CO2

100101

Current (Multiples of Is)

0.1

1

10

100

Ope

ratin

gtim

e (s

)

TMS 0.025 to 1.2 TD 0.5 to 15

IEC/UK curvesTMS = 1

IEEE/US curvesTD = 7

IEC Standard inverse t = TMS x

IEC Very inverse t = TMS x

IEC Extremely inverse t = TMS x

UK Long time inverse t = TMS x

IEEE Moderately inverse

t =0.0515

(IIs -1)0.02

TD7

x + 0.114

IEEE Very inverse

IEEE Extremely inverse

US CO8 Inverse

US CO2 Short timeinverse

t =19.61

(IIs -1)2

TD7

x + 0.491

t =28.2

(IIs -1)2

TD7

x + 0.1217

t =5.95

(IIs -1)2

TD7

x + 0.18

t =0.02394

(IIs -1)0.02

TD7

x + 0.01694

0.14

(IIs -1)0.02

13.5

(IIs -1)

80

(IIs -1)2

120

(IIs -1)

10

Phase faultIDMT/definitetime stages 0.08 to 4.0In

Definite time stages 0.08 to 10In

Definite time 0 to 100s

Standard earth faultIDMT and definitetime stages 0.02 to 4.0In

Definite time stages 0.02 to 10In

Definite time 0 to 200s

Sensitive earth faultIDMT/definitetime stages 0.005 to 0.1In

Definite time stages 0.005 to 0.8In

Definite time 0 to 200s

Wattmetric characteristic• Power threshold (1A)

0 to 20W (100 – 120V)0 to 80W (380 – 480V)

• Power threshold (5A)

0 to 100W (100 – 120V)0 to 400W (380 – 480V)

The IEC and IEEE/ANSI IDMTcurves for the above protectionsettings are shown in Figure 6.

Voltage dependentovercurrentOperatingmode Voltage controlled/

voltage restrained

Currentthreshold 0.8 to 4In

Definite time 0 to 100s

K factor 0.25 to 1.00

TMS 0.025 to 1.2

Reverse power/low forwardpower• 4W to 40W

(In = 1A, Vn = 100 – 120V)

• 16W to 160W(In = 1A, Vn = 380 – 480V)

• 20W to 200W(In = 5A, Vn = 100 – 120V)

• 80W to 800W(In = 5A, Vn = 380 – 480V)

• Time settings

Definite time 0 to 100s

DO timer 0 to 100s

Overpower• 4W to 300W

(In = 1A, Vn = 100 – 120V)

• 16W to 1200W(In = 1A, Vn = 380 – 480V)

• 20W to 1500W(In = 5A, Vn = 100 – 120V)

• 80W to 6000W(In = 1A, Vn = 380 – 480V)

• Time settings

Definite time 0 to 100s

Drop-off timer 0 to 100s

Loss of fieldMho characteristic settings(secondary ohms)

Mho offset

0 to 40/InΩ (100 – 120V)

0 to 160/InΩ (380 – 480V)

Diameter

25/In to 325/InΩ (100 – 120V)

100/In to 1300/InΩ (380 – 480V)

Linear characteristic 15° to 75°

Time delays 0 to 100s

Negative phase sequencethermalAlarm 0.03 to 0.5In

t> 0 to 100s

Trip 0.05 to 0.5In

k 2 to 40s

tmax 500 to 2000s

tmin 0 to 100s

• Vs (Voltage controlled)Vs1, Vs2 (Voltage restrained)20 to 120V (Vn 100 – 120V)80 to 480V (Vn 380 – 480V)

Underimpedance• Z< 2 to 120Ω

(Vn 100 – 120V, In 1A)

0.4 to 24Ω(Vn 100 – 120V, In 5A)

8 to 480Ω(Vn 380 – 480V, In 1A)

1.6 to 96Ω(Vn 380 – 480V, In 5A)

• Definite time 0 to 100s

Undervoltage• Voltage settings, Vs

10 to 120V (100 – 120V)

80 to 480V (Vn 380 – 480V)

• Time settings

Definite time 0 to 100s

IDMT t = k/(1 – V/Vs)

k 0.5 to 100

Overvoltage• Voltage settings, Vs

60 to 185V (100 – 120V)

240 to 740V (Vn 380 – 480V)

• Time settings

Definite time 0 to 100s

IDMT t = k/(V/Vs – 1)

k 0.5 to 100

Residual overvoltage• Voltage settings, Vs

1 to 50V (100 – 120V)

4 to 200V (Vn 380 – 480V)

• Time settings

Definite time 0 to 100s

IDMT t = k/(V/Vs – 1)

k 0.5 to 100

Under and overfrequency• Frequency settings 45 to 65Hz

• Time settings 0 to 100s

Biased differential/restrictedearth fault

DIFFI

BIASIs2I

s1IK1

K2

Trip

No trip

11

Overfluxing (V/Hz)• V/Hz trip and alarm

1.5 to 3.5V/Hz (100 – 120V)

6.0 to 14V/Hz (380 – 480V)

• TMS (trip) 1 to 63

• DT (trip and alarm) 0 to 100s

Resistive temperaturedetectors (RTDs)• RTD alarm temperature

0 to 200°C

• RTD trip temperature 0 to 200°C

• Alarm and trip timedelays 0 to 100s

Technical DataRatings

Inputs:• AC current (In)

1A/5A dual rated ac rms

• AC voltage (Vn)100 – 120V or 380 – 480V rmsnominal phase-phase

• Rated frequency 50/60Hz

• Operative range 5 to 70Hz

• Auxiliary voltage (Vx)

Nominal Operative range (V)(V)dc dc ac

24 – 54 19 – 65 –48 – 110 37 – 150 24 – 110110 – 250 87 – 300 80 – 265

Outputs:• Field voltage supply

48V dc (current limit: 112mA)

Burdens• DC auxiliary voltage

10W typical (P342)

12W typical (P343)

• AC auxiliary voltage10W typical (P342)

12W typical (P343)

• Optically isolated inputs0.24W per input at 48V

• Nominal voltage circuitVn 110 – 120V <0.02VA at 110VVn 380 – 440V <0.1VA at 440V

• Nominal current circuitPhase and neutral<0.1Ω at 1A<0.02Ω at 5A

Thermal withstand• AC current inputs

4.0In continuous30In for 10s100In for 1s

• AC voltage inputs

2 Vn continuous2.6 Vn for10s

Current transformerrequirementsThe following CT requirements arebased on a maximum prospectivefault current of 50In and the relayhaving a maximum high set settingof 25In. The CT requirements aredesigned to provide operation of:

• Phase and standard earth faultelements

1A rated currrent circuits2.5VA 10P 205A rated current circuits7.5VA 10P 20

• For generator differentialprotection:

Low impedance diffVk > 50In(Rct + 2RL)

High impedance diff Vk > 2 Vswhere Vs = 1.5If (Rct + 2RL)

Digital inputs• Optically isolated inputs may be

energised from the supervised48V field voltage provided or anexternal battery.

• Operating voltage >30V dc• Max. input voltage 60V dc• AC immunity 50V rms

Contacts• Contact ratings:

Make: 30A and carry for 3sCarry: 5A continuousBreak: dc 50W resistive

25W inductive(L/R = 40ms)

ac 1250VA resistive

ac 1250VA inductive(P.F. = 0.7)

Subject to maxima of 5A and300V

• Watchdog contact ratingsdc 30W resistivedc 15W inductive

(L/R = 40ms)ac 375VA inductive

(P.F. = 0.5)• Durability:

Loaded contact10,000 operations minimum

Unloaded contact100,000 operations minimum

Rear communications port• Connection

Multidrop (32 units)

• Cable typeScreened twisted pair

• Cable length 1000m max

• Connector Screw terminals

• Signal levels RS485

• Isolation SELV

• Remote access

Protocols supported• Courier

• Modbus

• IEC 60870-5-103• DNP 3.0Note: An interface to an optical

fibre, type 850nm, BFOC2.5 connector is availablefor IEC 60870-5-103.

Front communications port• Connection Point to point

• Cable type Multi-core

• Cable length 15m max

• Connector RS232 DTE9 pin D-type female

• Protocol Courier

• Isolation ELV

• Local access

IRIG-B Port• Carrier signal

Amplitude modulated

• Cable type50 ohm coaxial cable

• Connection BNC

• Isolation SELV

12

IEC 60255-22-2: 1996 Class 3

8kV discharge in air to allcommunication ports. 6kV pointcontact discharge to any part ofthe front of the product.

• Surge immunity

IEC 61000-4-5: 1995 Level 4

4kV peak, 1.2/50µs between allgroups and case earth.

2kV peak, 1.2/50µs betweenterminals of each group.

Excluding the RS232 anddownload/monitor ports

• EMC compliance

89/336/EEC

Compliance to the EuropeanCommission Directive on EMC isclaimed via the TechnicalConstruction File route.

Generic Standards were used toestablish conformity:

EN50081-2: 1994

EN50082-2: 1995

• Product safety

73/23/EEC

Compliance with EuropeanCommission Low VoltageDirective.

Compliance is demonstrated byreference to generic safetystandards:

EN61010-1: 1993/A2: 1995

EN60950: 1992/A11: 1997

Atmospheric environment• Temperature

IEC 60255-6:1988

Operating –25°C to +55°C

Storage and transit–25°C to +70°C

IEC 60068-2-1: 1990/A2:1994

Cold

IEC 60068-2-2: 1974/A2:1994

Dry heat

• Humidity

IEC 60068-2-3: 1969

56 days at 93% RH and +40°C

Internal battery• Battery type: 1/2AA, 3.6V

Download/monitor portThis is a 25 pin D-type femaleconnector located on the front userinterface and is specificallydesigned for test purposes andsoftware download.

• Isolation ELV

• Local access

High voltage withstand• Dielectric withstand

IEC 60255-5: 1977

2kV rms for 1 minute between allcase terminals connected togetherand the case earth.

2kV rms for 1 minute between allterminals of independent circuitswith terminals on eachindependent circuit connectedtogether.

ANSI/IEEE C37.90-1989(r1994)

1kV rms for 1 minute across theopen contacts of the watchdogrelays.

1kV rms for 1 minute across opencontacts of changeover outputrelays.

1.5kV rms for 1 minute acrossopen contacts of normally openoutput relays.

• High voltage impulse

IEC 60255-5: 1977

Three positive and three negativeimpulses of 5kV peak, 1.2/50µs,0.5J between all terminals and allterminals and case earth.

This is not applicable to theRS232 and download/monitorports.

Electrical environment• DC supply interruption

IEC 60255-11: 1979

The unit will withstand a 20msinterruption in the auxiliarysupply, in its quiescent state,without de-energising.

• AC ripple on dc supply

IEC 60255-11: 1979

The unit will withstand a 12% acripple on the dc supply.

• AC voltage dips and shortinterruptions

IEC 61000-4-11: 1994

20ms interruptions/dips.

• High frequency disturbance

IEC 60255-22-1: 1988 Class III

At 1MHz, for 2s with 200Ωsource impedance:

2.5kV peak between independentcircuits and independent circuitsand case earth.

1.0kV peak across terminals ofthe same circuit.

Excluding the RS232 anddownload/monitor ports

• Fast transient disturbance

IEC 60255-22-4 : 1992 Class IV

4kV, 2.5kHz applied directly toauxiliary supply

4kV, 2.5kHz applied to all inputs.

Excluding the RS232 anddownload/monitor ports

• Surge withstand capability

IEEE/ANSI C37.90.1 (1989)

4kV fast transient and 2.5kVoscillatory applied directly acrosseach output contact, opticallyisolated input, power supplycircuit, RS485, IRIG-B, VT and CTcircuits

• Radiated immunity

C37.90.2: 1995

25MHz to 1000MHz, zero and100% square wave modulated.Field strength of 35V/m.

• Electrostatic discharge

IEC 60255-22-2: 1996 Class 4

15kV discharge in air to userinterface, display and exposedmetal work.

13

• Enclosure protection

IEC 60529: 1989

IP52 Protection (front panel)against dust and dripping waterat 15° to the vertical.

Mechanical environment• Vibration

IEC 60255-21-1: 1996

Response Class 2

Endurance Class 2

• Shock and bump

IEC 60255-21-2: 1995

Shock response Class 2

Shock withstand Class 1

Bump Class 1

• Seismic

IEC 60255-21-3: 1995 Class 2

CasesP342 MiCOM 40TE

P343 MICOM 60TE

• Weight

P342 7.9 kg

P343 11.5 kg

Additional InformationTechnical Guide TG8617

Operation Guide OG8617

Courier Communications R4113

MiCOM S1 User Manual R8610

Midos Parts Catalogueand Assembly Instructions R7012

CaseThe MiCOM relays are housed in aspecially designed case providing ahigh density of functionality withinthe product, a customisable userinterface, and additional functions/information concealed by upper andlower covers. Physical protection ofthe front panel user interface andprevention of casual access isprovided by an optional transparentfront cover, which can be fitted oromitted according to choice sincethe front panel has been designedto IP52 protection against dust andwater. The case is suitable for eitherrack or panel mounting as shown inFigures 7 and 8.

23.30 155.40

181.30202.00

10.35

159.00 168.00

8 off holes Dia. 3.4

A B B A

A B B A

Flush mounting panel

Note: If mounting plateis required use flushmounting cut out dimensions

200.00

All dimensions in mm

Front view

177.00

206.00 30.00 Side view

240.00Incl. wiring

Secondary cover (when fitted)

157.5 max

177.0(4U)

483 (19” rack)

Sealing strip

Panel cut-out detailA = Clearance holesB = Mounting holes

Figure 7: Case sizes P342 (40TE)

Figure 8: Case size P343 (60TE)

A Clearance holesB Mounting holes

30.00 Side view

240.00Incl. wiring

Secondary cover (when fitted)

157.5 max

23.25

159.00

10.30

168.

00

177.00

Front view

116.55 142.45

155.40 129.50305.50

A B A B B A

A B B AB A

12 off holes Dia. 3.4

303.50

309.60

177.0(4U)

483 (19” rack)

Sealingstrip

All dimensions in mm

14

MiCOM P342/P343SpecificationAn integrated generator protectionsolution shall providecomprehensive protection againstphase and earth faults andabnormal voltage, frequency,power, field failure and overfluxingconditions.

Specific protection functions shallinclude; overcurrent, standard,sensitive and restricted earth faults,(100% stator earth fault), neutraldisplacement, voltage dependentovercurrent, under and overvoltage,under and overfrequency, reversepower/low forward power/overpower, loss of field, negative phasesequence thermal, overfluxing,(unintentional energisation atstandstill) and (generatordifferential) protections, as well as10 temperature measuring pointsusing RTDs

Two stages of phase overcurrentand earth fault protection shall beprovided, with a selection of nineIDMT characteristics for one of thestages. An additional CT shall beprovided for sensitive and restrictedearth fault protection. It shall bepossible to set the power element forunder power or reverse power aswell as for over power. It shall bepossible to configure the loss of fieldprotection in such a way that it canbe used for pole slipping protection.

Accessories Please quote on order

Rack frame, (in accordance with IEC 60297). FX0021 001

Case to rack sealing gaskets are available to improve the overall IPrating of the panel, (10 per order). GN2044 001

M4 90° pre-insulated ring terminals:Blue – Wire size 1.04 to 2.63mm2 (100 per order) ZB9124 900Red – Wire size 0.25 to 1.65mm2 (100 per order) ZB9124 901

Secondary cover: P342 Size 40TE GN0037 001P343 Size 60TE GN0038 001

Blanking plates: Size 10TE GJ2028 002Size 20TE GJ2028 004Size 30TE GJ2028 006Size 40TE GJ2028 008

Programming of the device shall bepossible using a front panel userinterface, local and remotecommunications ports.A configuration feature shall beprovided to enable selection ofrequired functions. This shall allowmenu customisation, removingunwanted functions and settingsgroups from the settings displays.The front panel user interface shallprovide independent keys for theviewing and acknowledgement ofalarms.

Fixed and programmable schemelogic shall be provided uploadablefrom relay to PC and PC to relay.

The relay shall store factory defaultprotection and scheme logic settingsfor restoration or upload to a PC.

Time-tagged event, fault anddisturbance records shall be storedin non-volatile memory. The internaldisturbance recorder shall have acapacity to store 20 records, eachrecord shall store sampled datafrom 8 analogue and 32 digitalchannels over a period of 10seconds.

The vendor shall be able to providesoftware support for local andremote programming, andextraction of records from thedevice.

A comprehensive range ofinstantaneous and integratedmeasurement values shall beavailable for viewing on the userinterface and the communicationsports. These values shall include thetemperature measurements that aretaken from the ten monitoringpoints.

Note: The functions in bracketsshould be included if theP343 is required andexcluded for the P342.

15

Generator Protection Relay

Version

Generator protectionGenerator protection with differential protectionand 100% stator earth fault

2

3

Vx aux rating

24 – 48V dc48 – 110V dc (30 – 100V ac)110 – 250V dc (100 – 240V ac)

Vn rating

100 – 120V ac380 – 480V ac

Hardware options

Standard versionIRIG-B inputFibre optic converter (IEC 60870-5-103)IRIG-B input & fibre optic converter (IEC 60870-5-103)

123

12

1234

Protocol options

K-BusModbusIEC 60870-5-103 (VDEW)DNP 3.0

1234

Relay type MiCOM P 43

Product specific

No resistive temperature devices10 resistive temperature devices

AB

Information Required with Order

Your contact:

TRANSMISSION & DISTRIBUTION Protection & Control, HQ, 60 Route de Sartrouville, BP58, 78230 Le Pecq Cedex, FranceTel: +33 (0) 134 80 79 00 Fax: +33 (0) 134 80 79 13 Email: pcs.enquiries@tde.alstom.com Internet: www.alstom.com

©2000 ALSTOM. ALSTOM, the ALSTOM logo and any alternative version thereof are trademarks and service marks of ALSTOM.Other names mentioned, registered or not, are the property of their respective companies.

Our policy is one of continuous development. Accordingly the design of our products may change at any time. Whilst every effort is made to produce up to date literature, this brochure shouldonly be regarded as a guide and is intended for information purposes only. Its contents do not constitute an offer for sale or advice on the application of any product referred to in it.

We cannot be held responsible for any reliance on any decisions taken on its contents without specific advice.

Publication R6614B 120030 CPS Printed in England.