1g Digital Energy

Gen

erat

ion

• Detectgroundfaultsthrough100%ofthestatorwindingincludingneutralpoint

• Sub-harmonicinjectionbasedstatorgroundprotectionprovidesearlydetectionofgroundfaultconditions

• DesignedtooperatewithMultilin’sindustryleadingG60UniversalRelayGeneratorProtectionSystem

• Activeprotectionofthegeneratorevenundermachineshutdownconditionsforincreasedassetlife

• Providingawiderangeoffaultresistancecoveragewhichallowsforsuperiorgeneratorprotection

• IncreasegeneratorlifespanbyeasilyupgradingyourcurrentG60generatorprotectionrelaywiththe100%StatorGroundProtectionModule

• SimplifiedsetupandconfigurationusingEnerVistasetupsoftware

Protection• Twostagestatorgroundresistancebasedelement–64S• Widerangefaultresistancecoverage(1-20Kohms)• Overcurrentelementforlowresistancefaults• CTphaseangleerrorcompensation

Diagnostics• Sub-harmonicvoltagesupervision• Sub-harmoniccurrentsupervision• Extensiveinternaldiagnosticswithcritical-failrelay

• Mediumtolargegeneratorapplications• Generatorswithhighimpedancegrounding

• Deployablewithredundantgeneratorprotectionsystems• Suitableforunittransformerconnectedsystems

FEATURES

APPLICATIONS

KEY BENEFITS

GPM-S100% STATOR GROUND

PROTECTION MODULECompleteGeneratorSystemProtection

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Protection & Control

Stator Ground Protection Module:

Stator ground module works incombination with UR G60 to provide a100%statorgroundfaultprotectionthatisoperationalduringgenerator start-up,running and stopped conditions. In the100%statorgroundfaultprotectionbasedonsub-harmonicinjection,a20Hzvoltageis injectedtodetectgroundfaultsatanypointacross100%ofthewindingtherebyprotecting the complete stator windingand allowing early detection of statorgroundfaultconditions.

Key components of the ground protection scheme:

• G60GeneratorProtectionSystem

• 20HzInjectionModule:GPM-S-G

• CouplingFilter:GPM-S-B

• CT:ITIPart#204-SD-43737

• SensitivegroundCT/VTmoduleinG60

G60 Generator Protection System

The G60 Generator Protection Systemprovides comprehensive protection formediumand largegenerators, includinglarge steam and combustion turbines,combined-cycle generators and multi-circuit hydro units. The G60 includesadvancedautomationandcommunicationcapabilities, extensive I/O options, andpowerfulfaultrecordingfeaturesthatcansimplifypostmortemdisturbanceanalysisandhelpminimizegeneratordowntime.

20Hz Injection Module

Using sub-harmonic injection providesearly detection of stator ground faultconditions. This isaccomplishedby theinjection module generating a squarewave pulse of 20Hz with a magnitudeof +/-26V into the stator winding. Theinjectionmodulemonitorsthefrequencyandmagnitudeofthesignalitgenerates,which allows for the Stator module todetermineifagroundfaulthasoccurredinthestatorwinding.Inaddition,thestatormoduleisalsoequippedwithacritical-failrelaythatcanbewiredtoalarmfailure.

Coupling filter

The coupling filter is used to meet twofunctions: to smooth the square waveand convert it into a sine wave and toprotect the injection module from ACvoltageimpressedfromthesecondaryofneutral grounding transformer. Couplingfiltercontainsonlypassivecomponents.ItalsocontainsvoltagedividercircuitstobeusedonapplicationswithNGTsecondaryvoltagegreaterthan500V.

100% Stator Ground Fault Detection

• The100%statorgroundfaultprotectionisbasedonsub-harmonicinjection• 20Hzvoltageisinjectedtodetectgroundfaultsatanypointacross100%ofthewinding• ThestatorgroundmoduleworksincombinationwiththeG60toprovide100%statorgroundfaultprotection• Operationalduringgeneratorstart-up,runningandstoppedconditions

StatorBus Duct Rotor Slip Rings

G60 Generator Protection Integration

•TheG60,GPM-S,andGPM-Fmodulesprovidecompletegeneratorprotection

•GPM-S&GPM-FProtectionunitsareconnecteddirectlytotheG60relay

•AllconfigurationandmonitoringisperformedthroughtheG60

NeutralGroundingTransformerCT

R

Band Pass Filter

Stator Module

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GPM-S 100% Stator Ground Protection Module

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Stator Module Band Pass Filter Module

Device Number Function

21P PhaseDistanceBackup24 VoltsPerHertz25 SynchronismCheck27P PhaseUndervoltage27TN ThirdHarmonicNeutralUndervoltage27X AuxiliaryUndervoltage32 SensitiveDirectionalPower40 LossofFieldRelay46 GeneratorUnbalance49 ThermalOverloadRTD50G GroundInstantaneousOvercurrent50N NeutralInstantaneousOvercurrent50P PhaseInstantaneousOvercurrent50SP SplitPhaseInstantaneousOvercurrent50/27 AccidentalEnergization51G GroundTimeOvercurrent51P PhaseTimeOvercurrent59N NeutralOvervoltage59P PhaseOvervoltage59X AuxiliaryOvervoltage59_2 NegativeSequenceOvervoltage64F Fieldgroundprotection64S Sub-harmonicstatorgroundprotection64TN 100%statorground67_2 NegativeSequenceDirectionalOvercurrent67N NeutralDirectionalOvercurrent67P PhaseDirectionalOvercurrent68 PowerSwingBlocking78 Out-of-StepProtection81O Overfrequency81R RateofChangeofFrequency81U Underfrequency87G Restrictedgroundfault87S GeneratorStatorDifferential

ANSIDeviceNumbers&Functions

G15G78 G05

64TN

51P 51N 46 2_76 N76P76 68 78

24 59P27P 59_2

25

Metering

Trip

Close

32 50/2740

59N 81U81O

27TN X72 X95

G60 Generator Protection System

52

R

87S

50N

81R

50P21P

G

49

64S

EX GPM-F 64F

Dimensional Data

Functional Block Diagram

19.160

5.250

7.250

8.451

17.760

19.160

5.250

7.250

8.451

17.760

11.870

7.500

7.310

9.370

7.869

8.300

11.870

7.500

7.310

9.370

7.869

8.300

Top Top

Front Front

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OrderingGPM-S DescriptionIncluded Components: 20HzGenerator

BandPassFilterCurrentTransformer

Protection Specifications

Sub-Harmonic 100% Stator Ground (64S)Statorgroundresistancepickupaccuracy:

+/-5%ofreadingovertherangefrom1kΩ-10kΩand+/-10%ofreadingovertherangeof10-20kΩ

TotalStatorCapacitancetoGround:

200nF–2µF

Sub-harmonicvoltagemeteringaccuracy:

+/-2%ofreadingor0.2Vovertherange0.5Vto25Vac

Sub-harmoniccurrentmeteringaccuracy:

+/-2%ofreadingor5mAovertherange5mAto200mA

Sub-harmonicelementoperatingtime:

0.6–1.2sec

Sub-harmonicelementdropoutlevelaccuracy:

102-103%ofpickup

Timedelayaccuracy: +/-3%oftimedelaysettingor+/-4mswhicheverisgreater

TestsDielectricvoltagewithstand

EN60255-5

Impulsevoltagewithstand

EN60255-5

Insulationresistance EN60255-5Dampedoscillatory IEC61000-4-18/IEC

60255-22-1Electrostaticdischarge EN61000-4-2/IEC60255-22-2RFimmunity EN61000-4-3/IEC60255-22-3Fasttransientdisturbance

EN61000-4-4/IEC60255-22-4

Surgeimmunity EN61000-4-5/IEC60255-22-5ConductedRFimmunity

EN61000-4-6/IEC60255-22-6

VoltageinterruptionandrippleDC

IEC60255-11

Radiatedandconductedemissions

CISPR11/CISPR22/IEC60255-25

Sinusoidalvibration IEC60255-21-1Shockandbump IEC60255-21-2Seismic IEC60255-21-3Powermagneticimmunity

IEC61000-4-8

Pulsemagneticimmunity

IEC61000-4-9

Dampedmagneticimmunity

IEC61000-4-10

Voltagedipandinterruption

IEC61000-4-11

Voltageripple IEC61000-4-17Ingressprotection IEC60529Environment(Cold) IEC60068-2-1Environment(Hot) IEC60068-2-2Humidity IEC60068-2-30SWCoscillatory IEEE/ANSIC37.90.1SWCtransients IEEE/ANSIC37.90.1RFimmunity IEEE/ANSIC37.90.2ESD IEEE/ANSIC37.90.3Safety UL508Safety ULC22.2-14Safety UL1053

EnvironmentalsTemperature: Storage:-40Cto+85C

Operating:-40Cto+70CHumidity: Upto95%(noncondensing)

@55C(asperIEC60068-2-30Variant1,6days)

Altitude: 2000m(maximum)PollutionDegree: IIOvervoltageCategory: IIIngressProtection: IP10

ApprovalsCEcompliance EN60255-5

EN60255-27EN60255-26EN50263

NorthAmerica UL508UL1053C22.2No.14

ISO ISO9001CEcompliance EN60255-5

EN60255-27EN60255-26EN50263

NorthAmerica UL508UL1053C22.2No.14

ISO ISO9001

• ViewGuideformspecifications

• Downloadtheinstructionmanual

• ReviewapplicationsNotesandsupportdocuments

• Buy100%statorgroundprotectiononline

• View/downloadthefieldgroundprotectionbrochure

Visit www.GEMultilin.com/GPM to: • URApplicationsIlearningCD TRCD-URA1-C-S-1

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