generator protection relays

SECTION 6:

GENERATOR PROTECTION

SELECTOR GUIDE....................62

489.............................................63

DGP ...........................................71

MGC ..........................................79

61

GENERATOR PROTECTION

489Protection for small and medium generators.

The 489 Generator Management Relay™ provides economical protection, metering, and monitoring functions. It can be used as

primary or backup protection on synchronous or induction generators of 25, 50, or 60 Hz. It may be applied in primary, backup

and co-generator applications.

DGPComprehensive protection and monitoring for generation applications.

The DGP is a digital system which provides a wide range of protection, monitoring, control and recording functions for AC

generators. It can be used on generators driven by steam, gas and hydraulic turbine. Any size of generator can be protected with

the DGP.

MGCThree phase protection for small generators.

The MGC1000 are microprocessor based, digital type, generator protection relays which provide thermal protection for three

phase generators, phase fault, ground fault, and unbalanced current protection.

Generator Protection62

PR

OT

EC

TIO

NM

ET

ER

ING

OT

HE

R F

EA

TU

RE

SC

OM

M.

489 DGP

FEATURES DEVICE MGC 489 DGP

Speed/number of processors 1 1 fast/5

Stator differential 87G

Loss of excitation 40 40-1, 40-2 40-1, 40-2

Anti-motoring (reverse power) 32

Time overcurrent -voltage restrained 51V

100% stator ground 59GN/27TN/64G

Ground overcurrent 50/51GN 51G 50/51GN 51GN

Overexcitation 24

Overvoltage 59

Undervoltage 27

Distance 21

High-set phase overcurrent 50

Ground directional 67

Over/underfrequency 81 O/U 2 STEP 4 STEP/2 STEP

Voltage transformer fuse failure 60FL

Accidental energization 50/27

Breaker failure 50BF

Negative sequence current 46

Output relays 6 16

Thermal image protection

Positive sequence

Time overcurrent 51

Sequential trip logic

Currents and voltages

Angles (I and V)

Negative sequence current (% I2)

3rd harmonic voltage

Watts (3 phase)

vars (3 phase)

Frequency

Demand (amps, watts, kvar, kva)

Thermal image

Positive sequence current

Negative sequence current

RS232 port 1 2

RS485 port 2 0

Protocol ModBus® RTU, DNP 3.0 GE modem, ModBus®

Printer port

Redundant power supply

IRIG-B time synchronism

Test plugs

Dedicated test output relays (pickup/trip)

Adaptive sampling (system frequency) 5-90 30-79 Hz

Fault reports (number stored) 1 40 3

Waveform capture 64 cycles 120 cycles

Trip coil supervision 1 4

Targets 22 18

Drawout design

PC program for setup and monitoring

Sequence of events 40 100

Digital inputs 9 6

Flash memory (for upgrading firmware in the field)

Statistical data logging

Analog inputs/outputs 4/4

RTDs (stator/bearing thermal) 38/49 12

Overspeed (digital input) 12

Bearing vibration (4-20 mA analog inputs) 39

Voltage phase reversal 47

KVA MVA

MGC

Generator Selector Guide Generator Selector Guide

6

GE Power Management63

6

489GeneratorManagementRelay

489GeneratorManagementRelay™

The 489 Generator ManagementRelay provides economical protec-tion, metering, and monitoringfunctions. It can be used as primaryor backup protection on synchro-nous or induction generators of 25,50, or 60 Hz. It may be applied inprimary, backup and co-generatorapplications.

The 489 offers comprehensivegenerator protection features. Thesefeatures include phase differential,100% stator ground, ground direc-tional overcurrent, negativesequence overcurrent, high-set over-current, voltage restrained phaseovercurrents, over and undervolt-age, over and underfrequency,distance element and reversepower. To accommodate synchro-nous generators, the protectionfeatures include overexcitation, lossof field, and inadvertent generatorenergization.

Monitoring functions include RMScurrent, negative sequence current,voltage, three phase power andtemperature via 12 RTD inputs.

VT fuse and breaker operation aremonitored and failures reported.

Four analog inputs may be used formonitoing vibration or control trans-ducers. The four analog outputchannels can be configured toreflect any measured parameter.They may be used to eliminate cost-ly transducers. Digital inputs may beused to route signals through the489 for protection, control, or diag-nostic functions.

The user interface includes a 40character display and a keypad.Twenty two LED indicators on thefront panel indicate status of the489, generator, and the outputrelays. A front panel RS232 portallows easy local computer access.Two rear panel RS485 ports provideremote access. Data communicationrates range from 300 to 19,200 bps.All data can be transmitted simulta-neously through the threecommunications ports to a DCS,SCADA, PLC, or PC. Windows®

based software is provided.

DESCRIPTION

Applications Synchronous or induction generators Primary, backup, and co-generator

Protection and Control Phase differential 100% stator ground Ground directional overcurrent Anti-motoring (reverse power) Loss of field Negative sequence overcurrent High-set overcurrent Voltage restrained phase overcurrent Overexcitation, V/Hz Undervoltage and overvoltage Voltage phase reversal Underfrequency and overfrequency Distance element Stator overtemperature Bearing overtemperature, vibration Inadvertent generator energization Breaker failure detection Overspeed VT fuse failure detection Trip coil supervision 4 analog outputs, 4 analog inputs 7 digital inputs, 12 RTD inputs

Monitoring and Metering Metering: A V W var VA Wh

varh PF Hz Demand values: A W var VA Event record, last 40 events Waveform capture: 64 cycles

User Interfaces 40 character display, full keypad One RS232 port, two RS485 ports ModBus® RTU, DNP 3.0 IRIG-B input

Economical protection, metering, andmonitoring functions for generators.

OverspeedDistanceVolts/HzUndervoltageInadvertent generator energizationReverse power/low forward powerBearing overtemperature (RTD)Bearing vibration (analog inputs)Loss of excitation (impedence)Loss of field (reactive power)Negative sequence overcurrent (I2

2t)Voltage phase reversalStator thermal (RTD/thermal model)High-set phase overcurrentBreaker failure detectionOffline overcurrentGround overcurrentVoltage restrained phase overcurrent Overvoltage100% stator groundVT fuse failure Ground directionalOverexcitation (analog input)Overfrequency/underfrequencyElectrical lockoutPercentage differentialSequential tripping logicTrip coil supervision

12212427

50/2732383940

40Q46474950

50BF50

50/51GN51V59

59GN/27TN60FL

67768186

87G

Sync

hron

ous

Indu

ctio

n

808783E6.cdr

87G

27TN59GN

49

50

46

86

49

12

38

50BF

Outputrelays

Trip CoilSupervision

RS485RS485

Analoginputs

Analogoutputs

Outputrelays

489

RS232

+

+

-

-4

4

6

52

GENERATOR

41

39

76

50/51GN

60FL

51V

50/27

32

21

40

40Q

24

59

810

81U

27

47

67


489 Generator Management Relay™489 Generator Management Relay™

6

PROTECTION

Machine Fault ProtectionThe dual slope percentage differentialelement (87G) is the primary protectionagainst machine faults.

Dual slope percentage differential

In addition to the differential element,the instantaneous overcurrent element(50) that is only active when the gener-ator is offline protects the machineagainst faults during startup. Sincethere is no need to differentiatebetween system and machine faultswhen the generator is offline, thiselement may have a setting which issignificantly more sensitive than thedifferential protection.

Stator Ground ProtectionIn addition to a ground overcurrentelement (51GN), the 489 has a VT inputto monitor the machine neutral volt-age. The 489 can detect grounddirectional (67) by comparing the anglebetween neutral voltage and groundcurrent to determine whether a groundfault is within the generator. 100%stator ground fault protection is provid-ed through an overvoltage element(59GN) that operates on fundamentalneutral voltage only and an adaptiveelement (27TN) that operates on thirdharmonic voltage ratio at the generatorterminals and the generator neutral.

Stator Thermal ProtectionMonitoring of stator RTDs provides ther-mal protection for the stator (49) duringrunning overload conditions. A votingfeature allows two RTDs to vote for highreliability. The 489 thermal model incor-porates an overload curve that may bebiased by the current unbalance and/orthe hottest stator RTD. Machine cooling issimulated using exponential decay of thethermal capacity used register. The ther-mal overload curve may also be used toprovide start-up protection for an induc-tion generator.

Bearing Protection Any of the 12 RTD inputs may beconfigured to monitor and protectagainst bearing overtemperatureconditions (38). A voting feature allowstwo RTDs to vote for high reliability.

The four programmable analog inputsmay be configured to monitor bearingvibration transducers. Alarm or tripfunctions may be configured for vibra-tion protection (39). On smallermachines, this type of simple vibrationprotection is very cost effective.

Excitation SystemProtection elements associated withthe operation of the excitation systeminclude overexcitation (24, V/Hz) under-voltage (27), and overvoltage (59).Definite time or inverse time curvesmay used to activate alarm or trip functions.

Loss of field protection may be accom-modated using loss of excitation (40)and reactive power (40Q).

489 Application

OPERATEREGION

1

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

00 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5

I OP

ER

AT

E (

mu

ltip

les

of

CT

)

I RESTRAINT (multiples of CT) 808790A2.cdr

Slope 1 = 10%

Slope 2 = 20%

Minimum Pickup = 0.10 x CT

FUNCTIONAL BLOCKDIAGRAM

Generator Protection 65

6


Sequential Tripping LogicDuring routine shutdown, and forsome of the less critical trips, it may bedesirable to use the sequential tripfunction to prevent overspeed. A digi-tal input may be used to monitor theturbine valve status. When the valve isclosed, either a low forward power orreverse power trip feature will trip thebreaker once the generator output hasfallen below the level programmed.

Abnormal Frequency (81)Alarm functions for both overfrequen-cy and underfrequency conditions areprovided. Operator action may betaken to correct the situation. Trippingfunctions are also provided if condi-tions persist or become more severe.

Operational FailuresOn a total or partial loss of the primemover if the power generated is lessthan the no-load losses of the machinereal power will start flowing into thegenerator. The reverse power function(32) may be used to trip the generatorwhen it begins motoring.

Inadvertent energization protection(50/27) may help to limit the damage thatcan occur if the generator is accidentallyplaced online while it is shutdown.

Overspeed (12)The speed is monitored by mountingan inductive proximity probe, or Halleffect sensor, near the shaft key orkeyway. The 489 provides 24 VDCpower for the sensor. The output of thesensor sends a pulse to an assignabledigital input which has been config-ured as a tachometer.

The 489 can monitor speed via an assignable input

Monitoring ProtectionIf breaker failure (50BF) is enabledwhen the 489 initiates a trip it willmonitor the breaker status input andthe generator current. If the breakerstatus contacts do not change state orgenerator current does not drop to zeroafter the programmed time delay, abreaker failure alarm will occur.

The trip coil supervision circuitry willmonitor the trip coil circuit for continu-

Rotor Thermal ProtectionRotor heating in generators due tonegative sequence current is a welldefined concept. Generators have veryspecific capability limits where unbal-anced current is concerned. Agenerator should have a rating for bothcontinuous and also short time opera-tion when negative sequence currentcomponents are present as defined bythe equation: K=I2t.

The 489 has a definite time alarm andinverse time overcurrent curve trip toprotect the generator rotor from over-heating due to the presence ofnegative sequence currents. A variablereset rate provides a thermal memoryof previous unbalance conditions.

Negative sequence inverse time overcurrent

System Backup ProtectionThree voltage restrained overcurrentelements (51V) provide backup protec-tion for system faults. The pickup levelfor the inverse time curves are adjust-ed in a fixed relationship with themeasured phase-phase voltage.

Voltage restraint characteristic

High-set phase overcurrent (50) alsoprovides backup protection to otherelements. If any individual phasecurrent exceeds the pickup level a tripwill occur. The element will operate inboth online and offline conditions.

Distance protection (21) implements twozone of mho phase to phase protection(total of six elements), which is intendedas backup for primary line protection.The elements, make use of the neutralend currents and the generator terminalvoltage to provide some protection forinternal and unit transformer faults.

ity any time that the breaker statusinput indicates that the breaker isclosed. If that continuity is broken, atrip coil monitor alarm will occur.

VT fuse failure (60FL) is detected whenthere are significant levels of negativesequence voltage without the corre-spondingly significant levels ofnegative sequence current. An alarmwill occur and features that use voltagemeasurements will be disabled.

MONITORINGAND METERING

MeteringThe 489 is provided with completemonitoring functions. These include:

current voltage power: kW kvar kVA energy use: MWh Mvarh power factor frequency 4 analog inputs

Demand and peak demand functionsinclude:

current power: kW kvar kVA

All measured quantities can be viewedon the front panel display, through thecommunications ports, or through oneof the 4 analog outputs.

Event RecordThe 489 captures and stores the last 40events, recording the time, date, andcause. All tripping functions are classedas events. Alarm functions may be selec-tively chosen as events. A snapshot ofmeasured parameters immediately priorto the event are stored with each event.All of the 489 event data may be readthrough any of the three communica-tions ports or viewed on the front paneldisplay.

When troubleshooting an event theevent record can be a valuable tool.The sequence of events can be an indi-cator of what really happened whilethe snapshot of measured data allowsfor complete diagnosis of the problem.

Waveform CaptureThe 489 samples the current and volt-age inputs at a rate of 12 times a cycle.These samples are stored in a config-urable buffer up to 64 cycles long. Thetrigger position setpoint allows the userto define how much of the buffer cyclesare pre and post trigger.

1

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

00 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

Cu

rve

Pic

kup

Mu

ltip

lier

Phase-Phase Voltage / Rated Phase-Phase Voltage 808792A2.cdr

SENSOR

ROTATING SHAFT

808755E2.dwg

TO 489DIGITAL

INPUT

0.1

1

10

100

1000

0.01 0.1 1 10 100

K=1.0 4.0 15 40 100

Tim

e (S

eco

nd

s)

Negative Sequence Current / Rated Current808791A2.cdr



6

The trace memory may be extracted fromthe relay through the communicationsports. It may be displayed using the489PC software provided with the relay.This allows the user to examine magni-tudes and phase relationships of themeasured signals when troubleshooting.

Waveform capture data can be displayed using the489PC program

Self TestThe 489 does a complete self-test atpower up and in the backgroundduring operation. A self-test failuretriggers an alarm.

INPUTS ANDOUTPUTS

Analog Inputs and OutputsThe 489 has 4 analog inputs and 4analog outputs. The four analog inputsare monitored by the 489 and can beused for functions such as the protec-tion and monitoring of bearingvibration. The 4 output channels can beconfigured to any measured parame-ter.

Digital InputsThe 489 has 7 assignable digital inputs.These can be used for such functionsas tachometer which may be used foroverspeed control.

RTD inputsThe 489 has 12 RTD inputs. This allowsthe user to monitor the temperature ofboth stator and bearings. A votingfeature allows two RTDs monitoringthe same device to vote for high relia-bility.

Output RelaysThe 489 has 6 output relays: 1 trip, 3auxiliary, 1 alarm, and 1 self-testrelays. LEDs on the front panel showthe status of each output.

Keypad and DisplayThe 489 has a 40 character vacuumflorescent display on the front panel. Ithas a keypad that includes full numerickeys and control keys.

LED Indicators The 489 has 22 LED indicators locatedon the front panel. Eight of these indi-cate 489 status, eight indicategenerator status, and six indicate theoutput relay status.

IRIG-B InputAn IRIB-B input is provided for timesynchronization using a satellite timesignal.

CommunicationsThe 489 is equipped with three communi-cations ports: a front panel RS232 portand two rear panel RS485 ports. Theseports support ModBus® RTU and DNP 3.0protocol. The RS232 port data transmis-sion rate is fixed at 9600 bps, while thetwo RS485 ports are variable from 300-19,200 bps. Data may be accessed fromall three ports simultaneously and inde-pendently without adversely affectingresponse time. In addition any measuredparameter is also available through thefour isolated analog outputs.

Data is available from the 489 via threecommunications ports and 4 analog inputs

A typical communications set up couldinclude a programmable logic controller(PLC) using the 4 analog outputs forcontrol functions. The front panel RS232port could be used for local interrogationand troubleshooting. One of the 485 portscould be used to connect a DCS or

SCADA system which would enablecontinuous on-line monitoring by theoperation personnel. The second RS485port could be wired to a modem, whichwould be used for off-site interrogation ofthe 489 by engineering personnel.

489PC SoftwareThe 489PC software is provided witheach 489. It runs under Windows® on apersonal computer. All the informationthat may be accessed through the frontpanel keypad and display may also beaccessed with a PC. This includes actu-al values, setpoints, status, eventrecords, and waveform capture infor-mation. The 489PC software may beused to display actual values over timein a graphical format. This may beparticularly useful in troubleshootingsituations.

489 setpoint files may be saved to a disk, printed, anddownloaded to the 489

The intuitive click and point softwaresimplifies setpoint programming andrelay interrogation. Setpoint files for eachgenerator may be stored, printed for veri-fication, and downloaded to the 489 forerror free setpoint entry.

The entire 489 manual is included in the489PC program in the form of a help file.This allows the user to quickly lookupinformation while programming therelay. The documentation and illustra-tions can be printed or pasted into otherWindows® applications.

Product UpgradesThe 489 uses flash memory technologyto allow product upgrades without unitdisassembly. Firmware upgrades maybe downloaded to the unit via theRS232 serial ports.

Drawout MechanismThe 489 consists of a drawout unit anda companion case. The case has a frontdoor with a large window so that thedisplay and LED indicators can be seenwith the door closed.

808765E3.cdr

METER SETTINGS

send to 489

saveon

disk

print

489 Windows Application-489

F ile S etpoint A ctual C ommunication H elp

ForHelp,pressF1

Actual-ChartRecorder

OK

Cancel

Seconds(ElapsedTime)

TrendingChart

RUN

PRINT

SR489 IN SERVICE BREAKER OPEN R1 TRIP

R2 AUXILIARY

R3 AUXILIARY

R4 AUXILIARY

R5 ALARM

R6 SERVICE

SETPOINT ACCESS BREAKER CLOSED

COMPUTER RS232 HOT STATOR

MESSAGE

VT FAILURE

BREAKER FAILURE

PROGRAM PORT SETPOINT 7 8 9

4 5 6

1 2 3

. 0 HELP

MESSAGE

VALUE

ACTUAL

ESCAPE

ENTER

RESET

NEXT

RESETPOSSIBLE

COMPUTERR S485

AUXILIARY RS485

ALT. SETPOINTS

SR489 STATUS GENERATOR STATUS OUTPUT RELAYS

NEG. SEQUENCE

GROUND

LOSS OF FIELD

489 Generator Management Relay™

808766E3.cdr

MODEM

SCADA/DCS

PLC

4 ANALOGOUTPUTS

AUXILIARYRS485

FRONT RS232

COMPUTERRS485

489 PC

489 PC

SR489 IN SERVICE BREAKER OPEN R1 TRIP

R2 AUXILIARY

R3 AUXILIARY

R4 AUXILIARY

R5 ALARM

R6 SERVICE



MESSAGE

VT FAILURE

BREAKER FAILURE

PROGRAM PORT SETPOINT 7 8 9

4 5 6

1 2 3

. 0 HELP

MESSAGE

VALUE

ACTUAL

ESCAPE

ENTER

RESET

NEXT

RESETPOSSIBLE

COMPUTERR S485

AUXILIARY RS485

ALT. SETPOINTS

SR489 STATUS GENERATOR STATUS OUTPUT RELAYS

NEG. SEQUENCE

GROUND

LOSS OF FIELD


MONITORINGAND METERING

USER INTERFACES


6


489 IN SERVICE BREAKER OPEN R1 TRIP

R2 AUXILIARY

R3 AUXILIARY

R4 AUXILIARY

R5 ALARM

R6 SERVICE



MESSAGE

VT FAILURE

BREAKER FAILURE

PROGRAM PORTSETPOINT 7 8 9

4 5 6

1 2 3

. 0 HELP

MESSAGE

VALUE

ACTUAL

ESCAPE

ENTER

RESET

NEXT

RESETPOSSIBLE

COMPUTER RS485

AUXILIARY RS485

ALT. SETPOINTS

489 STATUS GENERATOR STATUS OUTPUT RELAYS

NEG. SEQUENCE

GROUND

LOSS OF FIELD

EFGH

1

LOWER

ELOWER

EUPPER

FUPPER

F

UPPER

GUPPER

G

LOWER

HLOWER

H

R1 TRIP NC

R1 TRIP NO

R2 AUX COM

R3 AUX NC

R3 AUX NO

R4 AUX.COM

R5 ALARMNC

R5 ALARMNO

R6 SERVICECOM

NUETRALVT COM

NUETRALVT

TRIP COIL SUPERVISION+

IRIG-B+

IRIG-B-R1 TRIP COM

R2 AUX NO

R2 AUX NC

R3 AUX COM

R4 AUXNO

R4 AUX.NC

R5 ALARMCOM

R5 SERVICE NO

R6 SERVICENC

TRIP COILSUPERVISION-

PHASE VT COM

PHASE A VT

Ia NEUTRALCT

Ib NEUTRALCT

Ic NEUTRALCT

IA OUT CT

IB OUT CT

IC OUT CT

Ia NEUTRALCT

Ib NEUTRALCT

Ic NEUTRALCT

IA OUT CT

IB OUT CT

IC OUT CT

1A GROUNDCT

1A GROUNDCT

GROUND(HGF)CT

GROUND(HGF)CT

FILTERGROUND

SAFETYGROUND

PHASE B VT

PHASE C VT

CONTROLPOWER -

CONTROLPOWER +

2 3 4 5 6 7 8 9 10 11 12

A1

B1

B2

B3

B4

RTDSHD

COM

-

+AUX.RS485

A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 A13 A14 A15 A16 A17 -COM

-COMANSHOANALOG OUTPUTS ANALOG INPUTS

+ - COM#1 #2 #3 #4 #5 #6 #7SW com

+24Vdc

#1+ #2+ #3+ #4+ #1+#2+#3+#4+

COMP RS485ASSIGNABLE INPUTS

+24Vdc

A18 A19 A20 A21 A22 A23 A24 A25 A26 A27

C1+

+

C2ACCESS

BREAKER STATUS

-

-

C3

C4

D27D26D25D24D23D22D21D20D19D18D17D16

RTD6RTD5RTD4RTD3RTD2RTD1

RTD7 RTD8 RTD9 RTD10 RTD11 RTD12

D15D14D13D12D11D10D9D8D7D6D5D4D3D2D1

LOW VOLTAGE INPUTS, DO NOT HI-POT!

489GENERATOR MANAGEMENT RELAYTM

808784E8.cdr

DISPLAYForty character vacuum fluorescent display for setpoint programming, monitoring, status, and fault diagnostics.Up to twenty scrolling messagesmay be defined as the default display.

OUTPUT RELAYSIndicates any operation of the489 output relays.

GENERATOR STATUSIndicates if the generator is online or offline. Also indicates pickups of several protective features.

TRIP COIL SUPERVISIONMonitors the trip circuit for continuitywhen the generator is online andalarms if that continuity is broken.

KEYPADNumeric keys allow for simpleentry of setpoint values.Control keys allow simplenavigation through setpointand actual value messagestructures.Help key provides contextsensitive help messages.

ANALOG SIGNALSFour isolated 4-20 mA analog outputsmay be used to replace costlytransducers. They may be fieldprogrammed to reflect any measured parameter.Four 0-1 or 4-20 mA analog inputs maybe used to monitor any transducersignal. Possible applications includevibration and field current monitoring.

DIGITAL INPUTSAccess jumper input providessetpoint programming security.Breaker status input tells 489 ifthe generator is online or offline.Seven assignable digital inputs maybe field programmed for a variety offunctions including tachometer.

GROUNDSeparate safety and filter ground.All inputs meet C37.90 EMI, SWC,RFI interference immunity.

CT INPUTSSeven CT inputs provide 3 phaseoutput, 3 phase neutral and groundcurrent sensing.

AC/DC CONTROL POWERUniversal power supply 90-300 VDC 70-265 VAC

PROGRAM PORTThe front panel RS232 port may be connected to a PC for localinterrogation, downloadingsetpoint files, and upgradingproduct firmware.

489 STATUSIndicates when the 489 is inservice, if setpoint access isallowed, any communicationport activity, if alternate setpointsare in use, if any latched alarm ortrip may be reset, and if Nextkey should be pressed to displaydiagnostic messages.

OPERATOR KEYSOnce the 489 is programmed,normal operation requires onlytwo keys. The Reset key is used toreset latched trips or alarms. TheNext key is used to scroll throughdiagnostic messages in the eventof an alarm or trip.

RTD INPUTSTwelve RTD inputs are individually field programmable to measure platinum, nickel, or copper type RTDs.

OUTPUT RELAYSSix, trip duty, form C output relaysmay be assigned to trip, alarmand control functions.

VT INPUTSFour VT inputs provide wye or opendelta system voltage sensing as well as neutral voltage sensing.

RS485 COMMUNICATIONSTwo independent RS485communication ports may beaccessed simultaneously usingModbus® RTU and DNP 3.0 protocolat baud rates up to 19200 bps.


FEATURES

Front View

Rear View



6

OUTPUT CT's

PHASE A

PHASE B

PHASE C

EXCITERAND

AUTOMATICVOLTAGE

REGULATOR

FIELD

DCAmps

mA

OPTIONALTRANSDUCER

TO 4-20 mA INPUT FOROVEREXCITATION

PHASE a

PHASE b

PHASE c

GENERATOR

C(B)

B(C)

A

WYE VOLTAGETRANSFORMERCONNECTION

UNITCIRCUIT

BREAKER

OPEN DELTA VOLTAGETRANSFORMERCONNECTION

UNITCIRCUIT

BREAKER

LOADLOAD

INDUCTIVE/HALLEFFECT SENSORFOR TACHOMETER

+ 24

KEYSWITCHFOR SETPOINTACCESS

UNITBREAKER STATUS

(52a)DCS

GROUND COMMUNICATION PORTS ONLY AT MASTER DEVICE

RS485PORT

COMMON COMMON

4 –20mAANALOG

INPUTPLCor

COMPUTER

WATTS

VARS

STATOR RTDs

BEARING RTDs

#1+

#2+

#3+

#4+

SELF POWEREDBEARING VIBRATION

TRANSDUCERS

489PC

PERSONALCOMPUTER RS232

9 W

IRE

RS

232

ALARM ANNUNCIATOR

OUTPUT CONTACTSSHOWN WITH NOCONTROL POWER

SELF TEST ANNUNCIATOR

UNITSHUTDOWN

CIRCUIT

UNITTRIPCOIL52a

UNIT BREAKERTRIP CONTROL

GROUNDBUS

CONTROLPOWER

489POWERSUPPLY

F10 G9 H9 G10 H10 G3 H3 G4 H4 G5 H5 G6

H12

H11

G12

G11

E12

F12

E11F11

E2F1E1F2E3F3E5F4E4F5E6F6E8F7E7F8E9F9

H6 G7 H7 G8 H8 G2 H1 H2 G1

A27A26A25A24A23A22A21A20A19A18A17A16B4B3B2D27D26D25

C4C3C2C1

D24D23D22D21D20D19D18D17D16

D4D5D6D7D8D9

D10D11D12D13D14D15

A14A15D1D2D3

A9A10A11A12A13

A4A5A6A7A8

B1A1A2A3

cbaNEUTRAL END CT's

HG

F

E10

AUTOMATICCT SHORTINGTERMINALS

GROUND INPUTS

VNEUTRAL

1A

1A / 5A

1A / 5A

1A / 5A

1A / 5A

CO

M

CO

M

CO

M

CO

M

CO

M

1A / 5A

CO

M

1A / 5A

CO

M

Va Vb

Vc

Vco

m

CO

M

RTD RETURN

RTD RETURN

RTD RETURN

COMPENSATION

COMPENSATION

COMPENSATION

COMPENSATION

COMPENSATION

HOT

HOTHOT

HOTHOT

COMPENSATION

COMPENSATION

HOTHOT

RTD RETURN

RTD RETURN

COMPENSATION

COMPENSATION

HOTHOT

COMPENSATION

COMPENSATION

HOT

RTD RETURNCOMPENSATIONHOT

HOT

RTD SHIELD

RTD #1

RTD #2

RTD #3

RTD #4

RTD #5

RTD #6

RTD #7

RTD #8

RTD #9

RTD #10

RTD #11

RTD #12

ASSIGNABLE INPUT 1ASSIGNABLE INPUT 2ASSIGNABLE INPUT 3ASSIGNABLE INPUT 4ASSIGNABLE INPUT 5ASSIGNABLE INPUT 6ASSIGNABLE INPUT 7COMMONSWITCH + 24Vdc

ACCESS

BREAKER STATUS

DIG

ITAL IN

PUTS

COMPUTERRS485

AUXILIARYRS485

COM COM COMCOM

ANALOG OUTPUTS ANALOG INPUTS

ANALOG I/O

1 2 3 4 1 2 3 424

Vdc

SHIELD

FRONT PANEL LOCALPROGRAMMING PORT R

S23

2

R1 TRIP

R2 AUXILIARY

R3 AUXILIARY

R4 AUXILIARY

R5 ALARM

R6 SERVICE

TRIP COILSUPERVISION

CONTROL POWER

SAFETY GROUND

FILTER GROUND

PHASEVOLTAGE INPUTS

PHASE A PHASE B PHASE CPHASE PHASE PHASE

G2 H1 H2 G1

Va Vb

Vc

Vco

m

PHASEVOLTAGE INPUTS

IRIG-B

CHECK VOLTAGE RATINGOF THE UNIT

BEFORE APPLYING POWER.(SEE Pgs.2-8)

CAUTION

DO NOT INJECTVOLTAGES TO

DIGITAL INPUTS(DRY CONTACT

CONNECTIONS ONLY)

CAUTION

120Ω

1nF

120Ω

1nF

120Ω

1nF

120Ω 1nF

808752EG.dwg

RS232 INTERFACE

RELAY COMPUTER

9 PINCONNECTOR

25 PINCONNECTOR

TXDTXDRXDRXD

SGND SGND

1234567

20

2289

12

233

4

4

5

5

6 67

7

8

8

9

489 Generator Management Relay

GE Power Management

DO NOT INJECT OVER RATED CURRENTON G10 & H10.(See pg. 2 - 10)

CAUTION

TYPICAL WIRING

PROTECTIONGROUND CURRENT INPUTSCT Ratio: 10000:1 for 1 A secondary,

5:0.0025 for HGFCT Secondary: 1 A, 2.5 mA for HGFBurden: Less than 0.2 VA at rated load for 1 A

Less than 0.02 VA at rated load for HGFConversion Range: 0.02 - 20 x CT for 1 A

0.0 - 100 A primary for HGFAccuracy: at < 2 x CT: ± 0.5% of 2 x CT for 1 A

at ≥ 2 x CT: ± 1% of 20 x CT for 1 AHGF: at < 10 A: ± 0.1 A

at ≥ 10 - 100 A: ±1.0 A150 mA continuous

CT Withstand: 1 sec @ 80 times rated current for 1 A2 sec @ 40 times rated current for 1 Acontinuous @ 3 times rated current for 1 A

METERINGPHASE & DIFFERENTIAL CURRENT INPUTSCT Primary: 10 - 50000 ACT Secondary: 1 A or 5 A (must be specified with order)Burden: Less than 0.2 VA at rated loadConversion Range: 0.02 - 20 x CTAccuracy: at < 2 x CT: ± 0.5% of 2 x CT

at ≥ 2 x CT: ± 1% of 20 x CTCT Withstand: 1 sec @ 80 times rated current

2 sec @ 40 times rated currentcontinuous @ 3 times rated current

OUTPUTS

ANALOG CURRENT OUTPUTType: ActiveRange: 4-20 mA, 0-1 mA (must be specified with

order)Accuracy: ± 1% of full scale4-20 mA Maximum Load:

1200 Ω0-1 mA Maximum Load: 10 kΩIsolation: 36 Vpk (isolated with RTDs and analog

inputs)4 Assignable Outputs: phase A, B, C output current, 3 phase

average current, negative sequence,generator load, hottest stator RTD,hottest bearing RTD, hottest other RTD,RTD # 1-12, phase AB voltage, phase BCvoltage, phase CA voltage, 3 averagephase-phase voltage, V/Hz, frequency,3rd harmonic neutral voltage, Powerfactor, 3 phase real power (kW), 3 phaseapparent power (kVA), 3 phase reactivepower (kvar), analog inputs 1-4, currentdemand, kvar demand, kW demand, kVAdemand, thermal capacity used,tachometer

OUTPUT RELAYSConfiguration: 6 Electro-Mechanical Form CContact Material: silver alloyOperate Time: 10 msMax Ratings for 100000 operations

VOLTAGE MAKE/CARRY MAKE/CARRY BREAK MAXCONTINUOUS 0.2 sec LOAD

DC Resistive 30 VDC 10 A 30 A 10 A 300 W125 VDC 10 A 30 A 0.5 A 62.5 W250 VDC 10 A 30 A 0.3 A 75 W

DC Inductive 30 VDC 10 A 30 A 5 A 150 W125 VDC 10 A 30 A 0.25 A 31.3 W

(L/R = 40 ms) 250 VDC 10 A 30 A 0.15 A 37.5 WAC Resistive 120 VAC 10 A 30 A 10 A 2770 VA

250 VAC 10 A 30 A 10 A 2770 VAAC Inductive 120 VAC 10 A 30 A 4 A 480 VAPF=0.4 250 VAC 10 A 30 A 3 A 750 VA


6


SIDE VIEW REAR VIEW PANEL CUTOUTInches(mm)

808750E5.DWG

8.80" Max(224) 7.52"

(191)Panel

Panel

8.52"(216)

9.93"(252)

9.00"(229)

7.25"(184)

CUT-OUT

E

FG

H

E

F

G

H

UPPER

LOWER

DIMENSIONS

489 TECHNICAL SPECIFICATIONS

COMMUNICATIONS

COMMUNICATIONS PORTSRS232 Port: 1, Front Panel, non-isolatedRS485 Ports: 2, Isolated together @ 36 VpkBaud Rates: RS485: 300, 1200, 2400, 4800, 9600, 19200 bps

RS232: 9600 bpsParity: None, Odd, EvenProtocol: ModBus® RTU / half duplex, DNP 3.0

TYPE TESTS

Dielectric Strength: Per IEC 255-5 and ANSI/IEEE C37.902.0 kV for 1 min from relays, CTs, VTs,power supply to Safety Ground DO NOT CONNECT FILTER GROUND TOSAFETY GROUND DURING TEST

Insulation Resistance: IEC255-5 500 VDC, from relays, CTs, VTs,power supply to Safety Ground DO NOT CONNECT FILTER GROUND TOSAFETY GROUND DURING TEST

Transients: ANSI C37.90.1 Oscillatory (2.5 kV/1 MHz)ANSI C37.90.1 Fast Rise (5k V/10 ns)Ontario Hydro A-28M-82IEC255-4 impulse/high frequency disturbanceClass III Level

Impulse Test: IEC 255-5 0.5 J 5 kVRFI: 50 MHz/15 W transmitterEMI: C37.90.2 Electromagnetic Interference

@ 150 MHz and 450 MHz, 10 V/mStatic: IEC 801-2 Static DischargeEnvironment: IEC 68-2-38 Temperature/Humidity CycleVibration: Sinusoidal Vibration 8.0 g for 72 hrs

PRODUCTION TESTS

Thermal Cycling: Operational test at ambient, reducing to-40°C and then increasing to 60°C

Dielectric Strength: 2.0 kV for 1 min from relays, CTs, VTs,power supply to Safety Ground DO NOT CONNECT FILTER GROUND TOSAFETY GROUND DURING TEST

ENVIRONMENTAL

Ambient Operating Temperature: -40°C to +60°CAmbient Storage Temperature: -40°C to +80°C.Humidity: Up to 90%, noncondensing.Altitude: Up to 2000 mPollution Degree: 2NOTE: It is recommended that the 489 be powered up at least

once per year to prevent deterioration of electrolyticcapacitors in the power supply.

APPROVALS

ISO: Manufactured under an ISO9001 registered system.UL: UL approvedCSA: CSA approved

: Conforms to EN 55011/CISPR 11, EN 50082-2, Conforms to IEC 947-1, 1010-1

PACKAGING

Shipping Box: 12" W x 11" H x 10" D(30.5cm x 27.9cm x 25.4cm)

Shipping Weight: 17 lbs max (7.7 kg)

TERMINALS

Low Voltage (A, B, C, D terminals):12 AWG max

High Voltage (E, F, G, H terminals):#8 ring lug, 10 AWG wire standard

CASE

Fully drawout (automatic CT shorts)Seal provisionDust tight doorPanel or 19" rack mount

INPUTSPHASE VOLTAGE INPUTSVT Ratio: 1.00–240.00:1 in steps of 0.01VT Secondary: 200 VAC (full scale) Conversion Range: 0.02 - 1.00 x full scaleAccuracy: ± 0.5% of full scaleMax. Continuous: 280 VACNEUTRAL VOLTAGE INPUTVT Ratio: 1.00–240.00:1 in steps of 0.01VT Secondary: 100 VAC (full scale) Conversion Range: 0.005 - 1.00 x full scaleAccuracy: ± 0.5% of full scaleMax. Continuous: 280 VACDIGITAL INPUTSInputs: 9 opto-isolated inputsExternal Switch: dry contact < 800 Ω or

open collector NPN transistor from sensor6 mA sinking from internal 4 K pullup @ 24VDC with Vce < 4 VDC

489 Sensor Supply: +24VDC @ 20 mA max RTD INPUTSRTDs: 3 wire type 100 Ω Platinum (DIN.43760)

100 Ω Nickel field120 Ω Nickel programmable10 Ω Copper

RTD Sensing Current: 5 mAIsolation: 36 Vpk (isolated with analog inputs and

outputs)Range: -50 to +250°CAccuracy: ± 2 °C for Pt and Ni, ± 5°C for CuLead Resistance: 25 Ω Max per leadNo Sensor: >1000 ΩShort/Low Alarm: < -50°C ANALOG CURRENT INPUTSCurrent Inputs: 0-1 mA, 0-20 mA or 4-20 mA (setpoint)Input Impedance: 226 Ω ± 10%Conversion Range: 0-21 mAAccuracy: ± 1% of full scaleType: passiveAnalog Input Supply: +24 VDC @ 100 mA max

POWER SUPPLY

CONTROL POWEROptions: LO / HI (must be specified when ordering)Range:

LO: DC: 20 to 60 VDCAC: 20 to 48 VAC @ 48 to 62 Hz

HI: DC: 90 to 300 VDCAC: 70 to 265 VAC @ 48 to 62 Hz

Power: 45 VA (max), 25 VA typicalVoltage Loss-ride Through Time:

30 ms

*Specifications subject to change without notice.

MONITORINGTRIP COIL SUPERVISIONApplicable Voltage: 20-300 VDC/VACTrickle Current: 2-5 mA



6

489 * * *489 Base unit generator management relay

P1 Current Transformer Inputs: 1 A CT secondariesP5 Current Transformer Inputs: 5 A CT secondaries

LO Control Power: DC: 20-60 V; AC: 20-48 V @ 48-62 HzHI Control Power: DC: 90-300 V; AC: 70-265 V @ 48-62 Hz

A1 0-1 mA Analog OutputsA20 4-20 mA Analog Outputs

Accessories489PC Software: Shipped free with 489DEMO: Metal carry case in which 489 unit may be mounted19-1 PANEL: Single cutout for 19" panel19-2 PANEL: Double cutout for 19" panelSCI MODULE: RS232 to RS485 converter box, designed for harsh

industrial environmentsPhase CT: 50, 75, 100, 150, 200, 250, 300, 350, 400, 500, 600, 750, 1000HGF3, HGF5, HGF8: For sensitive ground detection on high resistance

grounded systems1 3/8" Collar: For shallow switchgear, reduces the depth of the relay by

1 3/8"3" Collar: For shallow switchgear, reduces the depth of the relay by 3"

Dual mounting available with the 19-2 panel

ORDERING

To order select the basic model and the desired features from the Selection Guide below.

Generator management shall beprovided using a relay with completeprotection, metering, and monitoringfunctions. The relay may be applied onsynchronous or induction generatorsof 25, 50, or 60 Hz.

The protection functions shall include:

instantaneous overcurrent whenoffline (50)

high-set overcurrent (50) distance (21) ground directional (67) instantaneous and definite time over-

current for ground (50/51GN) stator thermal modeling and RTD

(49) negative sequence overcurrent (46) bearing overtemperature (38) phase differential (87G) over and undervoltage (59/27) reverse power for anti-motoring (32) inadvertent generator energization

(50/27) overspeed (12)

GUIDEFORM SPECIFICATIONS

voltage restrained phase overcurrent(51V)

100% stator ground protection(59GN/27TN)

bearing vibration (39) voltage phase reversal (47) VT fuse failure detection (60FL) breaker failure detection (50BF) trip coil supervision sequential tripping logic

Synchronous generator protectionshall include:

overexcitation (24) loss of field (40 & 40Q) over and under frequency (81)

Monitoring and metering functionsshall include:

RMS current, negative sequencecurrent, voltage, three phase power,temperature (via the 12 RTDs), andfour analog inputs

four analog output channels whichcan be configured to any measuredparameter

an event record which shall maintaina record of the last 40 events

The current and voltage inputs shall besampled 12 times a cycle. The relayshall store these waveforms into a userdefinable buffer (up to 64 cycles long)in the event of a trip.

The protective relay shall include thefollowing user interfaces:

a 40 character vacuum flourescentdisplay, control keys and full numerickeypad located on the front panel

LED indicators located on the frontpanel which shall indicate the statusof the protection relay, generator,and output relays

an RS232 port located on the frontpanel with a baud rate of 9600 bps

two RS485 ports located on the rearof the unit with baud rates from 300to 19,200 bps

the communications ports shallallow simultaneous independentaccess using Modbus® RTU and DNP3.0 protocol

Windows® based PC software whichenables setpoint programming, filestorage, on-line help, and real timedisplay of status and measured data

The protective relay shall be providedwith drawout construction to facilitatetesting, maintenance, and interchangeflexibility.

808785E3.cdr

7 8 9

4 5 6

1 2 3

. 0

7 8 9

4 5 6

1 2 3

. 0

™Generator Management Relay is a trademark of GE Power Management

See pages15 - 18.

Online ordering isavailable for thisproduct.

www.GEindustrial.com/pm


6

DGPDigitalGeneratorProtection

DGPDigitalGeneratorProtection

The DGP is a digital system whichprovides a wide range of protection,monitoring, control and recordingfunctions for AC generators. It canbe used on generators driven bysteam, gas and hydraulic turbine.Any size of generator can be protect-ed with the DGP. A high degree ofdependability and security isachieved by extensive self diagnos-tic routines and an optionalredundant power supply.

The DGP provides the commonlyused protective functions in onepackage, including 100% statorground faults and accidental ener-gizing logics. It has adaptivesampling frequency for betterprotection during startup. The DGPhas eight configurable output relays,four trip and four alarm relays. Itallows strategic modifications of the

internal logic to favor either securityor dependability.

It has extensive metering, includingnegative sequence current and thirdharmonic voltages. The DGP canrecord the last 100 events, the last 3fault reports, and 120 cycles foroscillography.

An integral keypad, 16 characterdisplay, and target LEDs allow easylocal user interface. Front and rearRS232 serial ports allow remotecomputer access. An optional serialprinter port can also be supplied onthe rear.

The DGP is a compact, space saving,multi-function protection system. It'smodular construction allows for easymaintenance. It can be used withwye-wye or open-delta connectedVTs and any phase rotation.

DESCRIPTION

Applications AC generators (steam, gas, hydraulic) Any size of generator

Protection and Control Stator differential Current unbalance Loss of excitation Anti-motoring Time overcurrent, voltage restraint 100% stator ground fault Ground overcurrent Over excitation Over and undervoltage Over and underfrequency Voltage transformer fuse failure Accidental energization Eight configurable output relays Up to three configurable inputs Strategic modification of internal logic

Monitoring and Metering Extensive self-test diagnostics Trip circuit monitor Metering: A V W vars Hz Events - last 100 Fault reports - last 3 Oscillography - 120 cycles

User Interfaces 20 button keypad 16 character LED display Over 18 target LEDs Two RS232 serial ports One printer port IRIG-B time synchronization

Comprehensive protection, monitoring, control,and recording functions for AC generators.

6


DGP Digital Generator ProtectionDGP Digital Generator Protection

PROTECTION AND CONTROL

Current UnbalanceThere are several causes of unbalancein the generator including unbalancedloads, unbalanced system faults, andopen circuits. The negative-sequencecomponent of the stator current (I2) isdirectly related to this unbalance andsets up a counter rotating flux field inthe machine. This causes local heatingin the rotor iron. The capability ofmachines to withstand this heating istypically expressed in terms of an I22tconstant, and this constant is used bythe DGP to provide operating timecharacteristics. A linear reset is used toapproximate machine cooling follow-ing an intermittent current unbalancecondition. The DGP also includes acurrent unbalance alarm with anadjustable pickup and time delay whichis operated by the negative sequencecomponent I2.

The DGP can protect the generator from heatingcaused by current unbalance

Stator DifferentialThis function provides high speedprotection of the generator duringinternal phase-to-phase faults andthree-phase faults. It uses a product-restraint algorithm with dual-slopecharacteristics. This function canprovide phase-to-ground protectionprovided the neutral of the machine isgrounded or another machine operat-ing in parallel is grounded.

Anti-motoringIf a total or partial loss of prime moverresults in the power generated beingless than no-load losses of themachine, real power will start flowinginto the generator. Actual motoringpower can be as low as 0.5% of gener-ator rating for steam turbines to 100%for gas and hydraulic turbines.

The DGP includes a one or two stepanti-motoring reverse power functionwith individual time delay adjustments.One of the reverse power steps can beused for sequential tripping of thegenerator, in which the turbine istripped first. This step is enabled whenclosing of turbine inlet valves is indi-cated by digital input. The tripsequence is then continued when itsdelay time elapses. The second step isprimarily intended to provide backup

to the sequential trip. If the sequentialtrip is not enabled the two devices canbe used as two step reverse powerfunctions with independent timers.

Ground OvercurrentThis inverse overcurrent function canbe used to detect stator ground faultsin a high or low resistance groundedgenerator system. Since this function isindependent of the phase currentinputs it can alternately be connectedto a CT in the neutral of the generatorstep-up transformer.

Time Overcurrent with VoltageRestraintA system must be protected againstprolonged generator contribution to afault on the system. A time-overcurrentfunction with voltage restraint is part ofthe DGP system, primarily to provide apart of the system backup protection.This function is controlled by a faultdetector and a Voltage TransformerFuse Failure (VTFF) condition. A sepa-rate algorithm is processed for eachphase, with the restraint provided bycorresponding phase voltage. Therestraint is proportional to the magni-tude of the voltage and is independentof phase angle. A linear reset charac-teristic is incorporated for this function.

Stator GroundThis function consists of two overlap-ping zones to detect stator groundfaults in a high impedance groundedgenerator system. Normally a genera-tor stator neutral has a potential closeto ground. With the occurrence of astator ground fault a potential increasewill occur on the neutral for all faultsexcept those near the neutral.

Zone 1 uses a fundamental frequencyneutral overvoltage to cover about 95%of the stator winding, depending onthe pickup voltage setting.

Zone 2 (64G2) is based on computationof third harmonic voltage at the gener-ator neutral, compared to the totalthird harmonic voltage generated. Thisfunction is designed to cover 15% ofthe neutral end of the stator windings,and is controlled by fundamental andthird harmonic voltage thresholds.Wye-wye connected VTs on the gener-ator terminals are required for properoperation of 64G2. 3rd harmonicneutral undervoltage function (27TN)can be used as the zone 2 if deltaconnected VTs are used. Together thetwo zones cover 100% of the statorwindings.

FUNCTIONALBLOCK DIAGRAM

704750A8.CDR

To MODEM

To LAPTOPPC

TRIP

ALARM

52G

GSU Transf.

TOPOWERSYSTEM

GEN.

51GN

64G1

64G2

27TN

RS

232

46

87G

40

32

51V

VTFF

RS

232

64G2

24

32 40

27 59

81

VTFF

DGP

51V

87G Generator differential46 Current unbalance40 Loss of excitation32 Anti-motoring51V TOC with voltage restraint64G 100% stator ground51GN Stator ground overcurrent27TN 3rd harmonic neutral undervoltage24 Overexcitation59 Overvoltage27 Undervoltage81 Over and underfrequency50/27 Accidental energizationVTFF Voltage transformer fuse failure

DEVICE PROTECTION


6


Alternately, zone 1 can be used as agenerator-bus ground detector in ahigh impedance grounded orungrounded system.

The DGP uses two overlapping zones to detectstator ground faults

Loss of ExcitationThis feature is used to detect the lossof excitation on synchronousmachines. When a synchronous gener-ator loses excitation it will tend to actas an induction generator. It will thenrun above normal speed, operate atreduced power, and receive its excita-tion (vars) from the system. Theimpedance detected by a relayconnected to a generator will dependon the machine characteristics, theload flow prior to the loss of excitation,and the type of excitation failure.

The loss of excitation function includestwo mho characteristics, each withadjustable reach, offset, and timedelay. The DGP will block this functionif it detects a negative sequence volt-age, which would indicate a voltagetransformer fuse failure (VTFF), or anexternal VTFF signal.

The first zone mho function can be setto detect severe cases of excitation fail-ure with a short time delay. The secondzone mho function can be set to detectall the excitation failure cases with alonger time delay setting. This permitssystem security during stable powersystem swing conditions.

Over-excitationTo detect the over-excitation conditionthe DGP uses the quantity Volts/Hertz,which is proportional to magnetic fluxin the generator and step-up trans-former cores.

The over-excitation protection includestrip and alarm functions. The trip func-tion consists of an inverse function andan instantaneous function with timedelay characteristics. Both trip andalarm functions are computed for eachof the three phase voltages. The tripfunction incorporates a user config-urable linear reset characteristic tomimic machine cooling.

Over and UndervoltageThe undervoltage function consists of apositive sequence undervoltage with auser selectable inverse or definite timecharacteristic. The overvoltage functionconsists of a positive sequence over-voltage with an inverse characteristic.A linear reset characteristic is incorpo-rated for both functions. Theovervoltage function can be consideredas a backup to the over-excitation. Theundervoltage function inherentlyprovides voltage phase reversal protec-tion.

Over and UnderfrequencyThis function provides up to four stepsof over and under frequency protec-tion, each with an adjustable timedelay. The over and under frequencysteps are controlled by an adjustablepositive sequence voltage level.

Voltage Transformer FuseFailure (VTFF)The loss of excitation function and thetime overcurrent with voltage restraintfunction may operate for a full orpartial loss of AC potential caused byone or more blown fuses. When a fusefailure is detected the DGP will blocktripping by these functions.

Accidental EnergizationThe DGP system uses internal logic todetect accidental energization of thegenerator. When a generator is ener-gized while at standstill or reducedspeed it will behave and accelerate asan induction motor and this can bevery damaging to the machine. Themachine terminal voltage and currentduring such an event will be a functionof generator, transformer, and systemimpedance.

Configurable Inputs/OutputsThe DGP includes two general purposecontact converter inputs. These inputsallow easy connection of external tripor alarm contacts to take advantage ofthe sequence of events log and config-urable outputs of the DGP. An optionalconfiguration is also available for anadditional input to disable all protec-tions by the input.

The DGP offers a total of eight config-urable output relays, four trip and fouralarm relays. These outputs allow theuser to select any desired combinationof the functions.

Control functions of the DGP can selec-tively operate any of the output relayseither locally or remotely. This requiresa password to minimize unauthorizedaction. The remote control can also bedisabled by a hardwire jumper.

The control functions of the DGP can operateoutput relays locally or remotely

Configurable LogicThe DGP allows strategic modificationof internal logic to favor either securityor dependability. This can be accom-plished either by software settings orautomatically by a "Generator Off-line"contact input. This feature allowsdisabling of selected functions whenthe generator is off-line and modifyingof the Accidental Energization logic.

Contact Expansion UnitThe DEC 1000 unit is an intelligentcontact expansion unit. When thisoptional accessory is connected to theDGP serial printer port it provides anadditional 11 output relays, 5 withcontacts in ‘C’ configuration, and 6with normally open contacts. ElevenLED indicators are provided to registerthe operation of all contacts. A resetbutton is provided to test and reset theindicators. Available for “CA” modelonly.

The DEC 1000 expands the number of outputscontrolled by the DGP

PROTECTION AND CONTROL

95%

15%

704757A3.CDR

Neutral end

Terminal end

Zone 1

(64G1)

Zone 2

(64G2)

6



The DGP stores the last 100 events

Fault ReportsThe DGP stores up to the last threefault reports in its memory. A faultreport is generated by any protectivefunction trip or by an externally trig-gered input.

OscillographyThe DGP can capture and store 120cycles of oscillography data which canbe divided in to 1, 2, or 3 partitions.Prefault cycles captured can be set upto 20 cycles. In addition to 12 analogwaveforms (currents and voltages) theDGP captures internal logic flags andthe status of the contact inputs andoutputs. The DGP settings at the timeof the capture as well as the faultreport are also stored as part of thedata.

The DGP can store 120 cycles of oscillography

HARDWAREThe DGP system is packaged in a 8 RUhigh 19 inch rack mount case. Modelsare available with and without the testblocks. The drawout construction ofthe DGP case allows for all of the print-ed circuit boards, power supplies, andthe magnetic modules to be withdrawnfrom the front of the relay.

Self-Tests and DiagnosticsExtensive self-test routines areperformed by the DGP during power-up and continue to run in thebackground while the unit is in service.Any failure detected is categorized aseither a critical or non-critical alarm.Appropriate protective functions areautomatically disabled during a criticalalarm, helping to maintain the highsecurity of the DGP.

The DGP also has a RELAY TEST menuitem available via the front panelkeypad and display. This facilitatesinstallation by allowing testing of indi-vidual protective functions and outputrelays for effective trip testing of theprotection system.

Trip Circuit MonitorThe trip circuit monitor consists of thetrip voltage monitor (TVM) and the tripcurrent monitor (TCM) for up to fourtrip output contacts. The TVM detectsany discontinuity in the external tripcircuit and produces a non-criticalalarm. The TCM confirms energizing ofthe trip circuit when a trip is issued bythe DGP. To protect the output contactsthe TCM is also used to seal-in the tripoutput as long as the trip current is flowing.

MeteringThe DGP provides the following meter-ing values:

currents (Ia, Ib, Ic) voltages (Va, Vb, Vc, or Vab, Vbc, Vca) angles of I and V negative sequence current (%I2) third harmonic voltages (Ph./Neut.) watts (3 phase) vars (3 phase) frequency contact inputs (status)

The currents, voltages, watts, and varscan be metered as either primary orsecondary values and have an accuracyof 3%.

Sequence of Events RecordingThe last 100 events are time tagged tothe nearest millisecond and stored inthe DGP's memory. The event listincludes protective function opera-tions, self-test alarms, and operatoractions. The event data is available viathe RS232 ports as well as via theoptional printer port. The extensive listof events with accurate time stampingprovides the data for fast and effectiveanalysis of trip events to help minimizethe down time.

Keypad and DisplayA twenty button keypad and a 16 charac-ter LED display allow the user to easilyinterrogate the DGP and to changesettings. Metering data, trip event infor-mation, and settings can be displayed.To minimize unauthorized settingchanges or control action two distinctsecurity passwords are required.

A keypad and display are provided for local userinterface

LED IndicatorsOver eighteen LEDs are provided onthe front of the DGP for easy andimmediate indication of the fault typeand faulted phases.

A two color LED (red and green) is alsoprovided to indicate the relay status.

CommunicationTwo RS232 serial ports are provided onthe DGP, one on the front and one on therear. The port on the front allows easylocal user interface via a laptop computer.The rear port can be used to interfacewith a remote computer via a modem.There are three levels of security pass-word provided for remotecommunications. For added security hardwire jumpers can disable setting changesand control actions from a computer.

For remote link communications, DGPoffers choices of **GE-Modem or*ModBus® protocol. Each protocol issupplied with a copy of GE-LINK remotecommunication software. In addition tothe GE-LINK, a copy of the DGP-DATAsoftware is also supplied with the relayfor oscillography data analysis. It can beused to plot and analyze data filesretrieved from the DGP.

* Modbus® available with “CA” model only.Requires an optional RS485 to RS232converter.

** New Windows version of GE-LINK forModbus® protocol.

Time SynchronizationAn IRIG-B input is available whichpermits the relay to synchronize itsclock to the satellite time clock. Thisinsures that all event time stamping isconsistent across the entire system.

MONITORING AND METERING

File

Quit

Graphs Reports Setup eXit F1=Help

TEST_LOF.OSC:

LEFT RIGHTSAMPLE: 136 231 ELAPSED TIME: 132.7 MS (59.68 HZ)

VALUE: IAS +004.79IBS -010.05ICS +005.50VA -0035.9VB +0020.7VC +0016.4

-000.96 -001.41 +002.19-0048.8 +0035.2 +0014.1

DIFF: +005.75+008.64+003.31+0012.9+0014.5+0002.3

SEC AMPS

SEC VOLTS

20.0 AMPS

IAS

-20.0 AMPS

IBS

ICS

100.0 VOLTS

VA

-100.0 VOLTS

VB

VC

704755A1.CDR

704756A1.CDR

94G TRIP CIRCUIT OPEN ALARM OFF94G TRIP CIRCUIT OPEN ALARM ON94G2 TRIP SIGNAL RESET32-1 OFF32-2 OFF32-1 ONTURBINE INLET VALVE CLOSEDGENERATOR OFF-LINE94G2 TRIP SIGNAL ON32-2 ONGENERATOR ON-LINETURBINE INLET VALVE OPEN94G3 TRIP SIGNAL RESET64G1 OFFTURBINE INLET VALVE CLOSEDGENERATOR OFF-LINE94G3 TRIP SIGNAL ON64G1 ONGENERATOR ON-LINETURBINE INLET VALVE OPENREMOTE - SETTINGS CHANGE DONEREMOTE - SETTINGS CHANGE STARTED

GEN Simulator DGP

Station ID:MALVERN

Generator ID:MODEL GENERATOR

10/29/9310/29/9310/29/9310/29/9310/29/9310/29/9310/29/9310/29/9310/29/9310/29/9310/29/9310/29/9310/29/9310/29/9310/29/9310/29/9310/29/9310/29/9310/29/9310/29/9310/28/9010/28/93

14:40:42.27614:39:54.97114:33:35.66114:33:35.66014:33:35.63914:33:34.39614:33:31.99714:33:28.42314:33:26.45214:33:26.45114:27:09.87814:27:04.96814:26:54.26314:26:54.26214:26:50.91114:26:47.58414:26:42.60414:26:42.60314:25:44.44414:25:38.20216:32:31.64216:32:30.882

Events

USERINTERFACES


6


MAN MACHINE INTERFACE MODULE (MMI) 16 digit alpha-numeric LED display for fault report,

metering values, alarm messages, setting parameters etc. keypad includes 20 keys for user friendly

local interface with the DGP dual color LED indicates relay status RS232 port facilitates connection of lap-top PC

MODULESSystem Procesor (SSP),Analog Interface (ANI),Data Acquisition (DAP), &Digital Signal Processor(DSP) modules are plug-intype for ease of maintenanceand trouble-shooting.DIGITAL INPUT & TARGET

MODULE (DIT) LED targetsindicate ALL the functionsthat operated during atrip event.

POWER SUPPLY MODULES are located behind the cover plate. Module PS2 is optional.

OUTPUT RELAY CONTACTS 8 configurable relays 8 predefined relays

CONTROL POWERDC control power input

CT INPUTS 6 phase CT inputs 1 residual CT input 1 residual/neutral CT input

VT INPUTS: 3 phase VT inputs,

wye or delta 1 neutral VT input

RS232 PLUG (PL-1) provides connection to modem for remote communications or an interface to stationintegration system.

OPTIONAL SERIAL PORT (PL-2)Can be used to connect aprinter for automatic/manualprintout of data or a ContactExpansion Unit DEC1000.

OPTIONAL PLUG (PL-3) Available for IRIG-B signal input to synchronize the DGP internal clock to a common reference clock e.g. GPS receiver.

704752A8.CDR

1 2 3 4 5 6 7 8 9 10 11 12 13 14

1 2 3 4 5 6 7 8 9 10 11 12 13 14

1 2 3 4 5 6 7 8 9 10 11 12 13 14

1 2 3 4 5 6 7 8 9 10 11 12 13 14

1 2 3 4 5 6 7 8 9 10 11 12 13 14

1 2 3 4 5 6 7 8 9 10 11 12 13 14

DIGITAL INPUTS: 3 configurable contact

inputs 3 predefined contact

inputsAE

AF

AG

AH

BE

BF

BG

BH

SSP301 ANI301 DAP201 DSP401

SSP301MMI301

MGM781

DIT101

DIT101 MMI301

ANI301

PL-2PL-1 PL-3

DAP201 DSP401

MMI301

MGM781 TPM2

1

2

15

16

17

1

2

15

16

17

11

12

13

14

27

28

11

12

13

14

27

28

INVNFREQ

5 AMP100/140 VOLTS50/60 Hz

RATINGSINVNFREQ

5 AMP100/140 VOLTS50/60 Hz

RATINGS

PS2

VTFF

PS1

PS2PS1

TPM1

46

59

32

81-U 81-O

64G1 64G2

40G1 40G2

24A 24B 24C

51V-A 51V-B 51V-C

57A 57B 57C

MAGNETIC MODULES (MGM) Two identical modules contain CT’s, VT’s, output relays, etc. and areinterchangeable.

OPTIONAL TEST BLOCKSfacilitate injection of analog input signals and monitoring of DGP outputs for test purpose without disturbing field wiring.

FEATURES

Front View

Rear View

6



TYPICAL WIRING

GROUNDBUS

A

B

C

AH1

BG8

TRIP A (DRY)

TRIP B (DRY)

TRIP C (DRY)

TRIP D (DRY)

ALARM A

ALARM B

ALARM C

ALARM D

VT FUSE FAIL

TEST PICKUP

TEST TRIP

SPARE

SELF TESTNON CRITICAL

SELF-TESTCRITICAL

POWERSUPPLY

ALARM 1

POWERSUPPLYALARM 2

94G

94G1

94G2

94G3

74A

74B

74C

74D

74FF

DOR 12

DOR 13

DOR 9

74 NC

74 CR

TRIP A

TRIP B

TRIP C

TRIP D

704753A7.CDR

GENERATOROFF LINE

TURBINEINLET VALVE

LIMIT SWITCH

EXTERNALTRIP 1

INP

UT

S

OU

TP

UT

S

EXTERNALTRIP 2

OSCILLOGRAPHTRIGGER

EXT. VTFF/DISABLE PROT.

BG7

BG6

BG5

BG4

BG3

BG2

BE4

BE2

BG1

BE3

BE1

AH12

AG1 CONTROL

POWERAG2

BH14

BH1

BH9

AH2

AH11

BH2

BH10

AH3

BH3

BH11

AH4

BH4

BH12

AH5

BH5

AH9

AH6

BH6

AH10

AH7

BH7

AH8

BH8

IARGNDVOLT

IAS VAIBR IBS VBICR ICS VC

VOLTAGE

INPUTS

CURRENT

INR INS

AC(B)

B(C)

DB25

DB9

DB25

RS-232

DEC1000

or

ContactExpansion

Unit

IRIG-B

RS-232

PRINTER

(REAR)PL1

(FRONT)

(REAR)PL2

(REAR)PL3

BF5

AE7

BE5

BE6

BF6

BE10

BE9

BE8

BE14

BE13

BF10

BF9

BF14

BF13

BE7

AG13

AG12

AG11

AG10

AG6

AG5

AG9

AG8

AG7

BE12

AE13

AE12

AE10

AE6

AE5

AE9

AE8

BF8

BF7

AF14

AF13

AF11

AF10

AF6

AF5

AF9

AF8

AF7

BF12

BF11

AG14

BE11

AE14

AF12

AE11

(-)

(+)

(-)

(+)

(-)

(+)

(-)

(+)

PRINTER

DGPDigital Generator Protection

GE Power Management

APPROVALS

UL File No. E57838

PACKAGING

Net Weight: 51 lbs (23 kg)Dimensions:

Height: 14" (352 mm) 8 rack unitsWidth: 19" (484 mm) standard 19" rackDepth: 14" (356 mm)

TYPE TESTS

Insulation Test Voltage: 2kV 50/60 Hz, one min2.8k VDC, one min

Impulse Voltage Withstand: 5 kV peak, 1.2/50 µsec, 0.5 JInterference Test Withstand: SWC, per ANSI C37.90.1 &

IEC 255-5Vibration Test Withstand: IEC255-21-1

ENVIRONMENTAL

Ambient Temperature Range:Storage: -30°C to +70°COperation: -20°C to +55°C

Humidity: 95% without condensation

OUTPUTS

CONTACT DATATrip Outputs (4 programmable relays, 2 contacts each)Trip Contacts: Continuous Rating = 3 A

Make and Carry 30 A per ANSI C37.90Interrupting = 60 VA inductive,

maximum 250 V or 0.5 AAlarm Outputs(4 programmable & 5 predefined relays, 1 contact each)Alarm Contacts: Continuous Rating = 3 A

Make and Carry 5 A for 30 secInterrupting = 60 VA inductive,maximum 250 V or 0.5 A

Trip Current Monitor Sensitivity:150 mA

Trip Voltage Monitor: 38 - 300 VDCDigital Inputs: 38 - 300 VDC, 1 - 3 mA

COMMUNICATIONS

INTERFACE DATASystem Interface: DB25, RS232 port - rear panel

DB9, RS232 port - front panelIRIG-B port - rear panel (optional)Printer port - rear panel (optional)

INPUTS

BURDENS

Current Circuits: 0.022 Ω, 5° for In = 5 A0.12 Ω, 30° for In = 1 A@ 60 Hz 0.0507 < 4.738

Voltage Circuits: 0.30 VA, 60 Hz0.40 VA, 50 Hz

DC Battery:Power Supply: 19 W with 1 supply

25 W with 2 suppliesFor Contact Converters: 2.5 mA at rated voltage

POWER SUPPLY

DC Control Voltage:48 VDC 38.5 - 60 VDC110/125 VDC 88 - 150 VDC220/250 VDC 176 - 300 VDC

METERING

RATINGSNominal Frequency: 50 or 60 HzFrequency Tracking: 30 - 80 HzNominal Voltage (phase-phase): 100 - 210 VACRated Current: In = 1 or 5 AMaximum Permissible Current:

Continuous 2 x InThree Sec 50 x InOne Sec 100 x In

Maximum Permissible AC Voltage:Continuous 280 VACOne Min (once per hour) 490 VAC

ACCURACYRMS Measurements: ± 3%Phase Angle Measurements: ± 1 degreeFrequency Measurements: ± 0.01 HzTimers: ± 3% of settingData Time Tag Resolution: ± 1 ms

PROTECTION

In = 1 A In = 5 AGeneral Differential (87G):

Differential current pickup: 0.04 - 0.2 A 0.2 - 1.0 A% Slope factor: 1 - 10 1 - 10

Current Unbalance (46A, 46T):Neg. seq. current pickup: 0.01 - 0.60 A 0.5 - 2.99 AMachine constant (46T): 1 - 45 1 - 45Alarm time delay (46A): 1 - 9 sec 1 - 9 sec

Loss of Field (40):Zone 1 & Zone 2 Center: 12.5 - 300 Ω 2.5 - 60 ΩZone 1 & Zone 2 Radius: 12.5 -300 Ω 2.5 - 60 ΩZone 1 & Zone 2 Timer: 0.01 - 9.99 sec 0.01 - 9.99 sec

Anti-Motoring (32-1 & optional 32-2):Reverse power: 0.1 - 20.0 W 0.5 - 99.9 WTime delay: 1 - 120 sec

Stator Ground (64G1 & optional 64G2):Neutral OV pickup: 4 - 40 VTime delay (for 64G1): 0.1 - 9.9 secTime delay (for 64G2): 0.1 - 9.9 sec

3rd Harmonic Neutral Undervoltage (27TN):U/V setpoint: 0.1 - 9.9 VTime delay: 0.5 - 99.9 sec

Overexcitation, (24T, 24I, 24A):V/Hz Pickup: 1 - 1.99 PUTime factor (24T-Inverse): 0.1 - 99.99Time delay (Instantaneous): 0 - 9.9 secTime delay (24A-alarm): 0 - 9.9 secRate of reset: 0 - 999 sec

Undervoltage, optional (27):U/V set point: 40 - 120 VTime factor: 0.1 - 99.99 secCurve select: Inverse/Definite Time

Overvoltage (59):O/V set point: 100 - 225 VTime factor: 0.1 - 99.99 sec

Over & Underfrequency, up to 4 steps (81):O/F set point (each step): 45 -0 79.9 HzU/F set point (each step): 40 - 65 HzTime delay (each step): 0.05 - 99.99 secTime delay (U/F step 1): 0.1 - 999.9 sec

System Backup (51V):Overcurrent pickup: 0.1 - 3.2 A 0.5 - 16 ATime factor: 0.1 - 99.99 sec 0.1 - 99.99 sec


6


DGP TECHNICAL SPECIFICATIONS

DIMENSIONS

704751A3.DWG

CUTOUT

8 REQ'D.0.28" Dia.

(7)

*3.375"(86)

17.25"(438) 18.38"

(467)

13.94"(354)

4.00"(102)

4.00"(102)

2.94"(75)

1.50"(38)

1.0"(25)

13.03"(331)

0.31"(8)

13.88"(352)

* minimum to remove cable when req'd.

PLUG

TERMINALBLOCKS

19.00"(483)

SIDE VIEW PANEL CUTOUTFRONT VIEW

LATCH

Inches(mm)

DEC1000 MOUNTING

FRONT VIEW SIDE VIEW

CUTOUT & DRILLING PATTERN

19.00"(483)

3.40"(87)

8.1"(206) 1.20"

(30.4)

0.28" Dia.(7) 4 Pl.

18.32"(465)

17.35"(441)

3.54"(90)

3.00"(76)

0.26"(7)

INCHES(mm)

704759A2.dwg

CUTOUT

4


6



DGP * * * * * *DGP Digital Generator Protection

1 1 A rated5 5 A rated

0 One power supply, 48 VDC1 One power supply, 110/125 VDC2 One power supply, 220/250 VDC3 Two power supplies, 48 VDC4 Two power supplies, 110/125 VDC

A With test blocks, gray caseB Without test blocks, gray case

A GE-MODEM communication protocolB ModBus® communication protocol

(not available with Function Group A/B)A Function Group A See DGPB Function Group B SelectionC Function Group C Guide*

A Revision levelOptional RS485 to RS232 converter available for use with ModBus® version

GUIDEFORM SPECIFICATIONS

ORDERING

The primary protection for the AC gener-ator shall be an integrated digitalprotection system including protectionfunctions, control, monitoring, diagnosticand communication capabilities. A highdegree of dependability and security shallbe provided by extensive self-diagnosticroutines and an optional redundant DCpower supply.

The protection functions shall operateover the range of at least 31-79 Hz withthe same accuracy as at nominalsystem frequency.

The protection functions shall include: high speed generator stator differen-

tial (87G) negative sequence current unbalance

(46) loss of excitation (40) with two inde-

pendent zones anti-motoring (32) with two indepen-

dent steps 100% stator ground (64G) stator ground overcurrent (51GN) over-excitation (24) overvoltage (59) and undervoltage (27) over and underfrequency (81) with

four independent steps each system backup (51V) via time over-

current with voltage restraint accidental energization of the gener-

ator while on turning gear

Alarm functions shall be provided for: current unbalance over-excitation self-test failure AC potential failure (VT fuse failure) DC power supply failure

The protection equipment shall have sixcontact converter inputs including threeconfigurable inputs. Also it shall haveeight configurable relays and six assignedalarm relays which shall include:

4 configurable trip relays with 2contacts each

4 configurable alarm relays with onecontact each

1 critical self-test alarm 1 non-critical self-test alarm 1 VT fuse failure 1 for loss of each power supply 2 for individual protection function test

The protection equipment shall havemonitoring and metering functionswhich include:

the last 100 events, time tagged towithin one ms

fault report for the last three faults user configurable oscillography

which captures up to 120 cycles witha waveform sampling rate of at least12 samples per second

metering of currents, voltages,angles, negative sequence current,

3rd harmonic voltages, watts, vars,frequency, status of contact inputs

The protection equipment shall includethe following user interfaces:

individual target LEDs for eachprotection function, with a commonreset bush button on the front panel

20 button keypad to enter settings,access data, and test outputs

16 character LED display used with thekeypad for the above functions, and thedisplay of event summary informationand scrolled present AC values.

front and rear RS232 serial data portsfor local and remote communication,setting, data retrieval, and optionalbreaker control

local printer data port IRIG-B time synchronization port test and connection plugs for current

and voltage injection testing

The protection equipment shall usedrawout or plug-in modular constructionfor ease of maintenance. It will be suit-able for standard 19 inch rack mounting.

To order select the basic model and the desired features from the Selection Guide below.Note that DGP relay with special configuration of printer port is required for the DEC1000 to function properly.

*DGP Selection Guide FUNCTION GROUPFUNCTIONS AND FEATURES A B CStator differential 87G X X XCurrent unbalance 46 X X XLoss of excitation 40-1, -2 X X XOC – voltage restraint 51V X X XStator ground 64G1 (fundamental OV) X X XOverexcitation 24 (Volts/Hz) X X XOvervoltage 59 X X XAccidental energization logic X X XSequential trip logic X X XVT fuse failure X X XOscillography capture X X XIRIG-B input X X XAnti-motoring 32 2 setpoints 1 setpoint 2 setpointsStator ground 64G2 (3rd Harm. UV) X — XNeutral OC 51GN — X XUndervoltage 27 — X XStator GND 27TN — X XUnderfrequency 81-U 4 setpoints 2 setpoints 4 setpointsOverfrequency 81-0 4 setpoints 2 setpoints 2 setpointsPrinter output X — XDEC1000 compatible — — XCommunication ports 2-RS232 2-RS232 2-RS232

†DEC Selection GuideCODE R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11

001 32-2 59 81O1 81-2 81U1 81U2 40 46-2 46-1 32-1 —002 32-1 64G2 46-1 32-2 64G1 40-1 87G-A 87G-B 87G-C 46-2 40-2003 87G➀ 64G➁ 32-2 51GN 24➀ 87G➀ 64G➁ 32-2 51GN 24➀ 32-1004 46T 51V➀ 59 81O1 81U1 46T 51V➀ 59 81O1 81U1 40-1005 46T 51V➀ 59 64G1 87G➀ DI3 DI4 32-1 — — —➂➂

➀ Indicates any phase – A, B, or C ➂ Code assigned by GE➁ Indicates any zone – 1 or 2

DEC 1000A *** * 00CDEC

*** Select the three digit code from the DEC SelectionGuide† below or fill in desired function assignment forthe DEC1000 output relays R1-R11 using Table 1 andsubmit with the order. Codes 001 to 005 are alreadyassigned and are available as described. Any protectionfunction available in the companion DGP relay can beselected for the DEC output relay assignment

F Vps = 24-48 VDCH Vps = 110-250 VDC

Example: DGP54BBCA - DGP rated 5 amperes, 50/60 Hz, 110/125 VDC redundant power supplies, no built-in testblocks, ModBus® protocol, function group C, revision A.

The following special DGP™ systems are also available. Refer to factory for other special requirements.DGP***AAA-0101 - Similar to "AAA" except single-voltage rated Digital Inputs, special logic for function 51V andseparate terminals for power supply inputs.

See pages 15 - 18.

Online ordering is availablefor this product.


Last update June 16/00


MGCDigitalGeneratorProtection Relay

MGCDigitalGeneratorProtection Relay

Applications Small generators Component for bigger generator packages

Protection and Control Unbalance or current reversal Thermal protection Phase and ground faults

Features I1, I2, I0 metering and last trip data Part of a modular system Independent 4" modules 1/4 standard 19" rack cases available 3 digit display and reset button

Three phase protection forsmall generators.

DESCRIPTIONThe MGC1000 are microprocessorbased, digital type, generatorprotection relays which providethermal protection for three phasegenerators, phase fault, groundfault, and unbalanced currentprotection.

APPLICATIONSThe basic functions performed bythe MGC are:

46 - protection against unbalancedcurrent or current reversal(negative sequence)

49 - thermal protection51 - protection against phase faults51G - protection against ground

faults

The thermal image unit alsoprovides protection against exces-sive starts, given that once a trip hasbeen produced, the thermal unitdoes not reset until the temperatureof the generator decreases below agiven value.

CONSTRUCTION accurate and reliable, with low

power consumption rack mounting (case is 1/4 of a

rack wide, or 6.33") LED indicators for Pick-Up, Trip,

and System Availability three digit display, where the

following information is displayed:F0. present state of the equipmentF1. thermal state (%)F2. positive sequence current (xIs)F3. negative sequence current (xIs)F4. zero sequence current (xInGRN)F5. last trip (cause)F6. positive sequence current

during the tripF7. negative sequence current

during the tripF8. zero sequence current during

the trip anti-shock, flame resistant, sealed

plastic cover, which allows the tripindicator to be reset from outsidethe cover

elevated anti-seismic waveformresponse of the output relays

high reliability, solid state compo-nents

microprocessor system

STANDARDFUNCTIONS

Thermal Image UnitAdjustable between 0.55 and 1.3 times In insteps of 0.05 times In, through microswitcheslocated on the front of the relay.

Selectable operating curves as a function ofthe time constant (t1), adjustable between 1and 20 min in steps of one min.

Negative Sequence compensation (K1),adjustable from 1 to 6.

Cold time constant (t2) adjustable from 1 to 6times the warm time constant.

Positive Sequence Unit (I1)Adjustable between 1 and 8 times the valueselected for the thermal image unit.

Time delay of 0.05 to 10 sec in 0.05 sec steps.

Negative Sequence Unit (I2)The unit can operate either as an instanta-neous (adjustable time delay) or according toan inverse time curve; where the operatingmode can be selected by the user.

6

See pages 15 - 18.

Online ordering is availablefor this product.


APPROVALS

Compliant

PACKAGING

Approximate Weight:Net: 8.8 lbs (4 kg)Shipping: 11 lbs (5 kg)

TYPE TESTS

Insulation:Between Each Terminal and the Chassis:

2000 VAC for one min at industrial freq.Between Independent Circuits:

2000 VAC for one min at industrial freq.Between Terminals of Each Output Circuit:

1000 VAC for one min at industrial freq.Interference Test: 2.5 kV longitudinal, 1 kV transversal,

class 111, per IEC 255-4Impulse Test: 5 kV peak, 1.2/50 ms, 0.5 J, per IEC 255-4Electrostatic Discharge: Per IEC 801-2, class IIIRadio Interference: Per IEC 801-3, class III

ENVIRONMENTAL

Temperature:Operating: -10 to +55°CStorage: -40 to +70°C

Relative Humidity: to 95% without condensing

POWER SUPPLY

Auxiliary Voltage: 24-48 VDC/VAC, 48-125 VDC/VAC, 110-240 VDC/110-220 VAC (three models)

INPUTS

BURDENSBurden: Less than 1.5 W at all voltagesTHERMAL CAPACITY OF THE CURRENT CIRCUITSCurrent Capacity:

Continuous: 2 x In3 Sec: 50 x In1 Sec: 100 x In

Burdens:For Models: In = 5 A: 0.3 VA

In = 1 A: 0.3 VAIn = 0.2 A: 0.08 VA

METERING

ACCURACYOperating Value: 5%Operating Time: 5% or 0.025 sec, whichever is greaterClass E Error Index, Per BS142 for Current and Operating Times:

Class E-5

MONITORINGREPEATABILITYOperating Value: 1%Operating Time: 2% or 0.025 sec, whichever is greater

RATINGSNominal Frequency: 50 or 60 Hz, selectable by the userNominal Phase Current (In):

1 A or 5 ANominal Ground Current (InGRN):

5, 1 or 0.02 A (This last setting is recommended when used with toroidal current transformers)


MGC Digital Generator Protection RelayMGC Digital Generator Protection Relay

6 B10

B1

B9

B6

B3

B5

B4

B8

B7

720754A5.CDR

( - )

(+)

MANUALTRIP

MANUALCLOSE

SYST

EM

READ

YTR

IPTH

ERM

AL A

LARM 52/b

52/a

52/TC 52/CC

52

A

B

C

A9

A6

A8

A11

A12

A10

A7

A5

A3

A4

A2

A1

A

BC

GE Power Management

MGCDigital GeneratorProtection Relay

TYPICAL WIRING

Instantaneous Mode (adjustable timedelay): 0.5-8 x Is in steps of 0.1 x Is withtime delay of 0.05 to 10 sec in 0.05 secsteps.

Inverse Time Mode: Per the family ofcurves in Fig. 3, truncated for selec-table pick up settings between 0.1-1.0 xIs in steps of 0.1 x Is.

Zero Sequence Unit (I0) Adjustable between 0.06 and 0.24 xInGRN in steps of 0.01 x InGRN (InGRN = 5, 1 or 0.02 A).

Time Delay: 0.05 - 10 sec, adjustable insteps of 0.05 sec.

CONTACTCHARACTERISTICSMGC relays have two trip contacts, oneis normally open, and the other, electri-cally separate, is normally closed. Therelays incorporate two pre alarmtemperature contacts, electrically sepa-rate and with the same characteristicsas the trip contacts. They also include anormally closed contact for equipmentalarm.

Trip Contacts Closing: 3000 W resistive for 0.2 secwith a max of 30 A and 300 VDC.

Opening: 50 W resistive, with a max of2 A and 300 VDC.

Continuous: 5 A.

Alarm Contacts Closing: 5 A DC for 30 sec, at 250 VDCmaximum. Opening: 25 W inductiveand 250 VDC max.

Continuous: 3 A.

SETTINGSWith the exception of the current tap Is,the rest of the settings can be madethrough three push buttons located onthe front of the relay: ENTER; +; -; theselected setting value can be seen onthe display. A feature common to allthe units is the possibility for the userto disable them.

MGC TECHNICAL SPECIFICATIONS

MGC10 * 0D010 * 00 *MGC10 Three-pole tripping; 8 rack unit case

0 5 phase sec, 5 ground sec1 5 phase sec, 1 ground sec2 5 phase sec, 0.02 ground sec*3 1 phase sec, 1 ground sec*

F 24 - 48 VDC/VAC place auxiliary voltageG 48 -125 VDC/VAC place auxiliary voltageH 110 - 240 VDC/110-220 VAC place auxiliary voltage

C Individual drawout housingS As part of a MID† drawout system

* This model should be used only with toroidal current transformers for the neutralcurrent signal. For more details, refer to the instruction book.

† Modular Industrial Protection SystemExample: Microprocessor generator protection relay, with nominal phase current of In = 5 A, ground current InGRN = 1 A, standard type, with thermal alarm contact, andauxiliary voltage of 48-125 V.

ORDERINGTo order select the basic model and the desired features from the Selection Guide below.

STANDARDFUNCTIONS


generator protection relays

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