Instruction Book M-3425A Generator Protection...Pickup is based on the generator nominal current...

Instruction Book

M-3425AGenerator Protection

Generator Protection M‑3425AIntegrated Protection System® for Generators of All Sizes

PROTECTION

Unit shown with optional M‑3925A Target Module and M‑3931 HMI (Human‑Machine Interface) Module

• ExceedsIEEEC37.102andStandard242requirementsforgeneratorprotection

• Protectsgeneratorsofanyprimemover,groundingandconnectiontype

• Providesallmajorprotectivefunctionsforgeneratorprotection includingOut-of-Step(78),Split-PhaseDifferential(50DT), UnderFrequencyTimeAccumulation(81A),Inadvertent Energizing(50/27)andTurn-to-TurnFault(59X)

• ExpandedIPScom®CommunicationsSoftwareprovidessimpleand logicalsettingandprogramming,includinglogicschemes

• SimpleapplicationwithBaseandComprehensiveprotectionpackages

• Loadencroachmentblindersandpowerswingblockingfor systembackupprotection(21)toenhancesecurityduring systemabnormalconditions

• Options:EthernetConnection,FieldGround/BrushLift-OffProtection(64F/B),SyncCheck(25),100%StatorGroundFaultProtectionbylowfrequencyinjection(64S)andExpandedI/O(15additionalOutputContactsand8additionalControl/StatusInputs)

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M‑3425A Generator Protection Relay

Optional Protective Functions • SyncCheckwithPhaseAngle,∆Vand∆F

withdeadline/deadbusoptions(25) • FieldGround(64F)andBrushLiftOff(64B)

(IncludesM-3921FieldGroundCoupler) • 100% Stator Ground protection by low

frequency injection (64S). The followingequipmentisrequiredwiththe64Soption:

–20Hzsignalgenerator(430-00426) –Band-passFilter(430-00427)

–400/5A20HzCT(430-00428)

Standard Features • Eight programmable outputs and six

programmableinputs • Oscillographic recordingwithCOMTRADE

orBECOformat • Time-stampedtargetstoragefor32events • Metering of all measured parameters and

calculatedvalues • Three communications ports (two RS-232

andoneRS-485) • M-3820DIPScom®CommunicationsSoftware • IncludesMODBUSandBECO2200protocols • Standard 19" rack-mount design (vertical

mountingavailable) • Removableprintedcircuitboardandpowersupply • 50and60Hzmodelsavailable • Both1Aand5AratedCTinputsavailable • Additionaltripinputsforexternallyconnected

devices • IRIG-Btimesynchronization • OperatingTemperature:–20°Cto+70°C • SequenceofEventsLog • TripCircuitMonitoring • BreakerMonitoring • FourSetpointGroups

Optional Features • Redundantpowersupply • M-3925ATargetModule • M-3931 Human-Machine Interface (HMI)

Module • RJ45 Ethernet port utilizing MODBUS over

TCP/IP and BECO2200 over TCP/IP pro-tocols

• RJ45EthernetportutilizingIEC61850Pro-tocol

• M-3801D IPSplot® PLUS Oscillograph AnalysisSoftware

• Expanded I/O (15 additional outputs and 8additionalinputs)

• StandardandExpandedI/OModelsavailableinverticalpanelmount

Protective FunctionsBase Package • Overexcitation(V/Hz)(24) • PhaseUndervoltage(27) • Directional power sensitive triple-setpoint

Reverse Power, Low Forward Power or Overpowerdetection,oneofwhichcanbeusedforsequentialtripping(32)

• Dual-zone, offset-mho Loss of Field (40),which may be applied with undervoltagecontrolledacceleratedtripping

• Sensitive Negative Sequence Overcurrent protectionandalarm(46)

• InstantaneousPhaseOvercurrent(50) • InadvertentEnergizing(50/27) • GeneratorBreakerFailure(50BF) • InstantaneousNeutralOvercurrent(50N) • InverseTimeNeutralOvercurrent(51N) • Three-phase Inverse Time Overcurrent

(51V) with voltage control and voltage re-straint.

• PhaseOvervoltage(59) • NeutralOvervoltage(59N) • Multi-purposeOvervoltage(59X) • VTFuse-LossDetectionandblocking

(60FL) • ResidualDirectionalOvercurrent(67N) • Four-stepOver/Underfrequency(81) • PhaseDifferentialCurrent(87) • Ground (zero sequence) Differential

Current(87GD) • IPSlogictakesthecontactinputstatusand

function status and generates outputs byemploying (OR, AND, and NOT) booleanlogicandatimer.

Protective FunctionsComprehensive PackageTheComprehensivePackageincludesallBasePack-agefunctions,aswellasthefollowing:

• Three-zone Phase Distance protection forphase fault backup protection (21). ZonethreecanbeusedforOut-of-StepBlocking.Loadencroachmentblinderscanbeapplied.

• 100% Stator Ground Fault protection usingThirdHarmonicNeutralUndervoltage(27TN)or(59D)ThirdHarmonicVoltageDifferential(ratio)

• Stator Overload (49) (Positive SequenceOvercurrent)

• Definite Time Overcurrent (50DT) can beusedforsplitphasedifferential

• Out-of-Step(78) • UnderFrequencyAccumulation(81A) • RateofChangeofFrequency(81R)

–3–


PROTECTIVE FUNCTIONSDevice Setpoint Number Function Ranges Increment Accuracy†

Phase Distance (three‑zone mho characteristic) CircleDiameter#1,#2,#3 0.1to100.0Ω 0.1Ω 0.1Ωor5% (0.5to500.0Ω) (0.5Ωor5%)

Offset#1,#2,#3 –100.0to100.0Ω 0.1Ω 0.1Ωor5% (–500.0to500.0Ω) (0.5Ωor5%)

ImpedanceAngle#1,#2,#3 0°to90° 1° 1°

Load Encroachment Blinder #1,#2,#3 Angle 1°to90° 1° 1° RReach 0.1to100Ω

TimeDelay#1,#2,#3 1to8160Cycles 1Cycle 1Cycleor1%

Out-of-StepDelay 1to8160Cycles 1Cycle 1Cycleor1%

OvercurrentSupervision 0.1to20A 0.1A 0.1Aor2% (0.02to4A) 0.01A 0.02Aor2%

When out-of-step blocking on Zone 1 or Zone 2 is enabled, Zone 3 will not trip and it will be used to detect the out-of-step condition for blocking Function 21 #1 and/or 21 #2.

Volts / Hz Definite Time Pickup#1,#2 100to200% 1% 1%

TimeDelay#1,#2 30to8160Cycles 1Cycle 25Cycles

Inverse Time

Pickup 100to200% 1% 1% CharacteristicCurves InverseTime#1–#4 — —

TimeDial: Curve#1 1to100 1 1% TimeDial: Curves#2–#4 0.0to9.0 0.1 1%

ResetRate 1to999Sec. 1Sec. 1Secondor1% (fromthresholdoftrip)

The percent pickup is based on nominal VT secondary voltage and nominal system frequency settings. The pickup accuracy stated is only applicable from 10 to 80 Hz, 0 to 180 V, 100 to 150% V/Hz and a nominal voltage setting of 120 V.

Phase Undervoltage

Pickup#1,#2,#3 5to180V 1V 0.5Vor0.5% 0.8Vor0.75%*

TimeDelay#1,#2,#3 1to8160Cycles 1Cycle 1Cycleor0.5%**

* When both RMS and Line-Ground to Line-Line VT connection is selected.

**When RMS (total waveform) is selected, timing accuracy is O20 cycles or 1%.

†Selectthegreateroftheseaccuracyvalues. Valuesinparenthesesapplyto1ACTsecondaryrating.

21

24

27

–4–


PROTECTIVE FUNCTIONS (cont.)Device Setpoint Number Function Ranges Increment Accuracy†

Third‑Harmonic Undervoltage, Neutral

Pickup#1,#2 0.10to14.00V 0.01V 0.1Vor1%

PositiveSequence VoltageBlock 5to180V 1V 0.5Vor0.5%

ForwardUnderPowerBlock 0.01to1.00PU 0.01PU 0.01PUor2%

ReverseUnderPowerBlock–1.00to–0.01PU 0.01PU 0.01PUor2%

LeadUnderVArBlock –1.00to–0.01PU 0.01PU 0.01PUor2%

LagUnderVArBlock 0.01to1.00PU 0.01PU 0.01PUor2%

LeadPowerFactorBlock 0.01to1.00 0.01 0.03PUor3%

LagPowerFactorBlock 0.01to1.00 0.01 0.03PUor3%

HighBandForward PowerBlock 0.01to1.00PU 0.01PU 0.01PUor2%

LowBandForward PowerBlock 0.01to1.00PU 0.01PU 0.01PUor2%

TimeDelay#1,#2 1to8160Cycles 1Cycle –1to+5Cyclesor1%

Directional Power

Pickup#1,#2,#3 –3.000to+3.000PU 0.001PU 0.002PUor2%

TimeDelay#1,#2,#3 1to8160Cycles 1Cycle +16Cyclesor1%

The minimum Pickup limits are –.002 and +.002 respectively.

The per-unit pickup is based on nominal VT secondary voltage and nominal CT secondary current settings. This function can be selected as either overpower or underpower in the forward direction (positive setting) or reverse direction (negative setting). Element #3 can be set as real power or reactive power. This function includes a pro-grammable target LED that may be disabled.

Loss of Field (dual‑zone offset‑mho characteristic)

CircleDiameter#1,#2 0.1to100.0Ω 0.1Ω 0.1Ωor5% (0.5to500.0Ω) (0.5Ωor5%)

Offset#1,#2 –50.0to50.0Ω 0.1Ω 0.1Ωor5% (–250.0to250.0Ω) (0.5Ωor5%)

TimeDelay#1,#2 1to8160Cycles 1Cycle 1Cycleor1%

TimeDelaywith VoltageControl#1,#2 1to8160Cycles 1Cycle 1Cycleor1%

VoltageControl 5to180V 1V 0.5Vor0.5% (positivesequence)

DirectionalElement 0°to20° 1° —

Time delay with voltage control for each zone can be individually enabled.


40

32

27TN

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Negative Sequence Overcurrent

Definite Time Pickup 3to100% 1% 0.5%of5A (0.5%of1A)

TimeDelay 1to8160Cycles 1Cycle 1Cycleor1%

Inverse Time Pickup 3to100% 1% 0.5%of5A (0.5%of1A)

TimeDialSetting 1to95 1 3Cyclesor3% (K=I2

2t)

DefiniteMaximum TimetoTrip 600to65,500Cycles 1Cycle 1Cycleor1%

DefiniteMinimumTime 12Cycles — fixed

ResetTime(Linear) 1to600Seconds 1Second 1Secondor1% (fromthresholdoftrip)

Pickup is based on the generator nominal current setting.

Stator Overload Protection

TimeConstant#1,#2 1.0to999.9minutes 0.1minutes

MaximumOverloadCurrent 1.00to10.00A 0.01A 0.1Aor2% (0.20to2.00A)

Instantaneous Phase Overcurrent

Pickup#1,#2 0.1to240.0A 0.1A 0.1Aor3% (0.1to48.0A) (0.02Aor3%) TimeDelay#1,#2 1to8160Cycles 1Cycle 1Cycleor1%

When frequency f is < (fnom –5 ) Hz add an additional time of (1.5/f + 0.033) sec to the time delay accuracy.

Breaker Failure

Pickup PhaseCurrent 0.10to10.00A 0.01A 0.1Aor2% (0.02to2.00A) (0.02Aor2%)

NeutralCurrent 0.10to10.00A 0.01A 0.1Aor2% (0.02to2.00A) (0.02Aor2%)


50BF can be initiated from designated M-3425A output contacts or programmable control/status inputs.

Definite Time Overcurrent

PickupPhaseA#1,#2 0.20Ato240.00A 0.01A 0.1Aor3% (0.04Ato48.00A) (0.02Aor3%)

PickupPhaseB#1,#2 (sameasabove)

PickupPhaseC#1,#2 (sameasabove)


This function uses generator line-side currents.

When 50DT function is used for split-phase differential protection, 50BF, 87, and 87GD functions should not be used, and the IA, IB and IC inputs must be connected to the split phase differential currents.


50DT

50

50BF

50BF-Ph

50BF-N

46

49

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Instantaneous Neutral Overcurrent

Pickup 0.1to240.0A 0.1A 0.1Aor3% (0.1to48.0A) (0.02Aor3%) TimeDelay 1to8160Cycles 1Cycle 1Cycleor1%

When the frequency f is < (fnom –5) Hz add an additional time of (1.5/f + 0.033) sec to the time delay accuracy.

Inadvertent Energizing

Overcurrent Pickup 0.5to15.00A 0.01A 0.1Aor2% (0.1to3.00A) (0.02Aor2%)

Undervoltage Pickup 5to130V 1V 0.5V

Pick-upTimeDelay 1to8160Cycles 1Cycle 1Cycleor1%

Drop-outTimeDelay 1to8160Cycles 1Cycle 1Cycleor1%

When RMS (total Waveform) is selected, timing accuracy is O20 cycles or 1%.

Inverse Time Neutral Overcurrent

Pickup 0.25to12.00A 0.01A 0.1Aor1% (0.05to2.40A) (0.02Aor1%)

CharacteristicCurve DefiniteTime/Inverse/VeryInverse/ExtremelyInverse/IECCurves ModeratelyInverse/VeryInverse/ExtremelyInverse/IEEECurves

TimeDial 0.5to11.0 0.1 3Cyclesor3%* 0.05to1.10(IECcurves) 0.01 0.5to15.0(IEEEcurves) 0.01

* For IEC Curves the timing accuracy is 5%.

When the frequency f is < (fnom –5 )Hz add an additional time of (1.5/f + 0.033) sec to the time delay accuracy.

Inverse Time Phase Overcurrent, with Voltage Control or Voltage Restraint



TimeDial 0.5to11.0 0.1 3Cyclesor3%* 0.05to1.10(IECcurves) 0.01 0.5to15.0(IEEEcurves) 0.01

VoltageControl(VC) 5to180V 1V 0.5Vor0.5% or VoltageRestraint(VR) LinearRestraint — —

* For IEC Curves the timing accuracy is 5%.

51V

51N

50N

50/27

50

27


–7–



Phase Overvoltage

Pickup#1,#2,#3 5to180V 1V 0.5Vor0.5% 0.8Vor0.75%*

TimeDelay#1,#2,#3 1to8160Cycles 1Cycle 1Cycleor1%**

InputVoltageSelect Phase,PositiveorNegativeSequence***

* When both RMS and Line-Ground to Line-Line is selected.

** When RMS (total waveform) is selected, timing accuracy is O20 cycles or 1%.

*** When positive or negative sequence voltage is selected, the 59 Function uses the discrete Fourier transform (DFT) for magnitude calculation, irrespective of the RMS/DFT selection, and timing accuracy is 1 Cycle or 1%. Positive and negative sequence voltages are calculated in terms of line-to-line voltage when Line to Line is selected for V.T. Configuration.

Third‑Harmonic Voltage Differential Ratio

Ratio(Vx/VN) 0.1to5.0 0.1


PositiveSeqVoltageBlock 5to180V 1V 0.5Vor0.5%

LineSideVoltage VXor3V0(calculated)

The 59D function has a cutoff voltage of 0.5 V for 3rd harmonic VX voltage. If the 180 Hz component of VN is exp-tected to be less than 0.5 V the 59D function can not be used.

The 59D function with VX cannot be enabled if the 25 function is enabled. The line side voltage can be selected as the third harmonic of 3V0 (equivalent to VA + VB + VC) or VX.

3V0 selection for line side voltage can only be used with line-ground VT configuration.

Neutral Overvoltage

Pickup#1,#2,#3 5.0to180.0V 0.1V 0.5Vor0.5%

TimeDelay#1,#2,#3 1to8160Cycles 1Cycle 1Cycleor1%

When 64S is purchased, the 59N Time Delay Accuracy is –1 to +5 cycles.

Multi‑purpose Overvoltage

Pickup#1,#2 5.0to180.0V 0.1V 0.5Vor0.5%


Multi-purpose input that may be used for turn-to-turn stator ground protection, bus ground protection, or as an extra Phase-Phase, or Phase-Ground voltage input.

When 64S is purchased, the 59N Time Delay accuracy is –1 to +5 cycles.

VT Fuse‑Loss Detection

A VT fuse‑loss condition is detected by using the positive and negative sequence components of the voltages and currents. VT fuse‑loss output can be initiated from internally generated logic, and/or from input contacts.

AlarmTimeDelay 1to8160Cycles 1Cycle 1Cycleor1%

ThreePhaseVT FuseLossDetection Enable/Disable

59

59N

60FL

59X

59D


–8–



Residual Directional Overcurrent

Definite Time* Pickup 0.5to240.0A 0.1A 0.1Aor3% (0.1to48.0A) (0.02Aor3%)

TimeDelay 1to8160Cycles 1Cycle –1to+3Cyclesor1%

Inverse Time* Pickup 0.25to12.00A 0.01A 0.1Aor3% (0.05to2.40A) (0.02Aor3%)


TimeDial 0.5to11.0 0.1 3Cyclesor5% 0.05to1.10(IECCurves) 0.01 0.5to15.0(IEEEcurves) 0.01

Directional Element MaxSensitivityAngle(MSA) 0to359° 1°

PolarizingQuantity 3Vo(calculated),VNorVX*Directional control for 67NDT or 67NIT may be disabled.VX polarization cannot be used if 25 function is enabled.3Vo polarization can only be used with line-ground VT configuration.Operating current for 67N can be selected as 3Io (calculated) or IN (Residual CT).

If 87GD is enabled, 67N with IN (Residual CT) operating current will not be available.

Out of Step (mho characteristic)

CircleDiameter 0.1to100.0Ω 0.1Ω 0.1Ωor5% (0.5to500.0Ω) (0.5Ωor5%)

Offset –100.0to100.0Ω 0.1Ω 0.1Ωor5% (–500.0to500.0Ω) (0.5Ωor5%)

ImpedanceAngle 0°to90° 1° 1°

Blinder 0.1to50.0Ω 0.1Ω 0.1Ωor5% (0.5to250.0Ω) (0.5Ωor5%)


TriponmhoExit Enable/Disable

PoleSlipCounter 1to20 1

PoleSlipReset 1to8160Cycles 1Cycle 1Cycleor1%

Frequency

Pickup#1,#2,#3,#4 50.00to67.00Hz 0.01Hz 0.02Hz 40.00to57.00Hz*

TimeDelay#1–#4 3to65,500Cycles 1Cycle 2Cyclesor1%

The pickup accuracy applies to 60 Hz models at a range of 57 to 63 Hz, and to 50 Hz models at a range of 47 to 53 Hz. Beyond these ranges, the accuracy is 0.1 Hz.

* This range applies to 50 Hz nominal frequency models.


81

78

67N

–9–



Frequency Accumulation

Bands#1,#2,#3,#4,#5,#6 HighBand#1 50.00to67.00Hz 0.01Hz 0.02Hz 40.00to57.00Hz*

LowBand#1–#6 50.00to67.00Hz 0.01Hz 0.02Hz 40.00to57.00Hz*

Delay#1–#6 3to360,000Cycles 1Cycle 2Cyclesor1%

When using multiple frequency bands, the lower limit of the previous band becomes the upper limit for the next band, i.e., Low Band #2 is the upper limit for Band #3, and so forth. Frequency bands must be used in sequential order, 1 to 6. Band #1 must be enabled to use Bands #2–#6. If any band is disabled, all following bands are disabled.

When frequency is within an enabled band limit, accumulation time starts (there is an internal ten cycle delay prior to accumulation) and allows the underfrequency blade resonance to be established to avoid unnecessary accumulation of time. When duration is greater than set delay, the alarm asserts and a target log entry is made.

The pickup accuracy applies to 60 Hz models at a range of 57 to 63 Hz, and 50 Hz models at a range of 47 to 53 Hz. Beyond these ranges, the accuracy is 0.1 Hz.

* This range applies to 50 Hz nominal frequency models.

Rate of Change of Frequency

Pickup#1,#2 0.10to20.00Hz/Sec. 0.01Hz/Sec. 0.05Hz/Sec.or5%

TimeDelay#1,#2 3to8160Cycles 1Cycle +20Cycles

NegativeSequence VoltageInhibit 0to99% 1% 0.5%

Phase Differential Current

Pickup#1,#2 0.20Ato3.00A 0.01A 0.1Aor5% (0.04to0.60A) (0.02Aor5%)

PercentSlope#1,#2 1to100% 1% 2%

TimeDelay*#1,#2 1to8160Cycles 1Cycle 1Cycleor1%

CTCorrection** 0.50to2.00 0.01

*When a time delay of 1 cycle is selected, the response time is less than 1–1/2 cycles.

**The CT Correction factor is multiplied by IA,IB,IC.

Ground (zero sequence) Differential Current


TimeDelay 1to8160Cycles* 1Cycle +1to-2Cyclesor1%

CTRatioCorrection(RC) 0.10to7.99 0.01

*The Time Delay Setting should not be less than 2 Cycles.

The 87GD function is provided primarily for low-impedance grounded generator applications. This function oper-ates as a directional differential. If 3I0 or In is extremely small (less than 0.2 secondary Amps), the element be-comes non-directional.

If 67N function with IN (Residual) operating current is enabled, 87GD will not be available. Also, if 50DT is used for split-phase differential, 87GD function will not be available.


87

87GD

81R

81A

–10–



IPSlogicTM

IPSlogic uses element pickups, element trip commands, control/status input state changes, output contact close signals to develop 6 programmable logic schemes.

TimeDelay#1–#6 1to8160Cycles 1Cycle 1Cycleor1%

Breaker Monitoring

Pickup 0to50,000kACycles 1kACycles 1kACycles orkA2Cycles orkA2Cycles orkA2Cycles

TimeDelay 0.1to4095.9Cycles 0.1Cycles 1Cycleor1%

TimingMethod ITorI2T

PresetAccumulators 0to50,000kACycles 1kACycle PhaseA,B,C

The Breaker Monitor feature calculates an estimate of the per-phase wear on the breaker contacts by measuring and integrating the current (or current squared) through the breaker contacts as an arc.

The per-phase values are added to an accumulated total for each phase, and then compared to a user-pro-grammed threshold value. When the threshold is exceeded in any phase, the relay can set a programmable output contact.

The accumulated value for each phase can be displayed.

The Breaker Monitoring feature requires an initiating contact to begin accumulation, and the accumulation begins after the set time delay.

Trip Circuit Monitoring


The AUX input is provided for monitoring the integrity of the trip circuit. This input can be used for nominal trip coil voltages of 24 V dc, 48 V dc, 125 V dc and 250 V dc.

Nominal Settings

NominalVoltage 50.0to140.0V 0.1V —

NominalCurrent 0.50to6.00A 0.01A —

VTConfiguration Line-Line/Line-Ground/ Line-GroundtoLine-Line* Delta/WyeUnit Transformer Disable/DeltaAB/DeltaAC

Seal-InDelay 2to8160Cycles 1Cycle 1Cycleor1%

*When Line-Ground to Line-Line is selected, the relay internally calculates the line-line voltages from the line-ground voltages for all voltage-sensitive functions. This Line-Ground to Line-Line selection should only be used for a VT connected Line-Ground with a secondary voltage of 69 V (not 120 V).


IPS

BM

TC

–11–


64F

64B

25

25S

25D

64S

OPTIONAL PROTECTIVE FUNCTIONSDevice Setpoint Number Function Ranges Increment Accuracy†

Sync Check

Dead Check DeadVoltageLimit 0to60V 1V 0.5Vor±0.5%

DeadTimeDelay 1to8160Cycles 1Cycle –1to+3Cyclesor1%

Sync Check PhaseAngleLimit 0°to90° 1° 1°

UpperVoltageLimit 60to140V 1V 0.5Vor±0.5%

LowerVoltageLimit 40to120V 1V 0.5Vor±0.5%

DeltaVoltageLimit 1.0to50.0V 0.1V 0.5Vor±0.5%

DeltaFrequencyLimit 0.001to0.500Hz 0.001Hz 0.0007Hzor±5%

SyncCheckTimeDelay 1to8160Cycles 1Cycle –1to+3Cyclesor±1%

Various combinations of input supervised hot/dead closing schemes may be selected. The 25 function cannot be enabled if the 59D function with VX or 67N function with VX is enabled.

Field Ground Protection

Pickup#1,#2 5to100KΩ 1KΩ 10%or±1KΩ TimeDelay#1,#2 1to8160Cycles 1Cycle (2IF+1)Sec.

InjectionFrequency(IF) 0.10to1.00Hz 0.01Hz

Brush Lift‑Off Detection(measuringcontrolcircuit) Pickup 0to5000mV 1mV

TimeDelay 1to8160Cycles 1Cycle (2IF+1)Sec.

When 64F is purchased, an external Coupler Module (M-3921) is provided for isolation from dc field voltages.

Figure 10, Field Ground Protection Block Diagram, illustrates a typical connection utilizing the M-3921 Field Ground Coupler. Hardware dimensional and mounting information is shown in Figure 11, M-3921 Field Ground Coupler Mounting Dimensions.

100% Stator Ground Protection by low frequency injection

TotalCurrentPickup 2to75mA 0.1mA 2mAor10% RealComponentof TotalCurrentPickup 2to75mA 0.1mA 2mAor10% TimeDelay 1to8160Cycles 1Cycle 1Cycle*or1%

An external Low Frequency Generator, Band Pass Filter and Current Transformer are required for this function. Figure 13, 64S Function Component Connection Diagram, illustrates a typical 100% Stator Ground Protection by Low Frequency Injection application. Hardware dimensional and mounting information is illustrated in Figures 14 and 15.

59D and 27TN function should be disabled when the 64S function is enabled. 59N may be applied when this func-tion is enabled.

* Time Delay accuracy in cycles is based on 20 Hz frequency.


–12–


DescriptionTheM-3425AGeneratorProtectionRelayissuitableforallgeneratorratingsandprimemovers.Typicalcon-nectiondiagramsare illustrated inFigure4,M-3425AOne-LineFunctionalDiagram(configured forphasedifferential),andFigure5,One-LineFunctionalDiagram(configuredforsplit-phasedifferential).

Configuration OptionsTheM-3425AGeneratorProtectionRelayisavailableineitheraBaseorComprehensivepackageofprotec-tivefunctions.Thisprovidestheuserwithflexibilityinselectingaprotectivesystemtobestsuittheapplication.AdditionalOptionalProtectiveFunctionsmaybeaddedatthetimeofpurchaseatper-functionpricing.

TheHuman-MachineInterface(HMI)Module,TargetModule,orredundantpowersupplycanbeselectedattimeofpurchase.

WhentheFieldGround(64F)PremiumProtectiveFunctionispurchased,anexternalcouplermodule(M-3921)isprovidedforisolationfromthedcfieldvoltages.

When100%StatorGround(64S)protectionusinglow-frequencyinjectionispurchased,anexternalbandpassfilterandfrequencygeneratorisprovided.

Multiple Setpoint Profiles (Groups)Therelaysupportsfoursetpointprofiles.Thisfeatureallowsmultiplesetpointprofilestobedefinedfordifferentpowersystemconfigurationsorgeneratoroperatingmodes.ProfilescanbeswitchedeithermanuallyusingtheHuman-MachineInterface(HMI),bycommunications,programmablelogicorbycontrol/statusinputs.

NOTE: Duringprofileswitching,relayoperationisdisabledforapproximately1second.

MeteringTherelayprovidesmeteringofvoltages(phase,neutralandsequencequantities),currents(phase,neutralandsequencequantities),realpower,reactivepower,powerfactorandimpedancemeasurements.

Meteringaccuraciesare:

Voltage: 0.5Vor0.5%,whicheverisgreater 0.8Vor0.75%,whicheverisgreater(whenbothRMSandLine-GroundtoLine-Lineare selected)

Current: 5Arating,0.1Aor3%,whicheverisgreater 1Arating,0.02Aor3%,whicheverisgreater

Power: 0.01PUor2%ofVAapplied,whicheverisgreater

Frequency: 0.02Hz(from57to63Hzfor60Hzmodels;from47to53Hzfor50Hzmodels) 0.1Hzbeyond63Hzfor60Hzmodels,andbeyond53Hzfor50Hzmodels

Volts/Hz: 1%

Oscillographic RecorderTheoscillographicrecorderprovidescomprehensivedatarecordingofallmonitoredwaveforms,storingupto416cyclesofdata.Thetotalrecordlengthisuser-configurablefrom1to16partitions.Thesamplingrateis16timesthepowersystemnominalfrequency(50or60Hz).Therecordermaybetriggeredusingeitherthedesignatedcontrol/statusinputs,tripoutputs,orusingserialcommunications.Whenuntriggered,therecordercontinuouslystoreswaveformdata, therebykeeping themost recentdata inmemory.When triggered, therecorderstorespre-triggerdata,thencontinuestostoredatainmemoryforauser-defined,post-triggerdelayperiod.ThedatarecordscanbestoredineitherBeckwithElectricformatorCOMTRADEformat.

Target StorageInformationassociatedwiththelast32tripsisstored.Theinformationincludesthefunction(s)operated,thefunctionspickedup,input/outputstatus,timestamp,andphaseandneutralcurrentsatthetimeoftrip.

–13–


Sequence of Events LogTheSequenceofEventsLogrecordsrelayelementstatus,I/Ostatus,measuredvaluesandcalculatedvaluestimestampedwith1msresolutionatuser-definedevents.TheSequenceofEventsLogincludes512ofthemostrecentlyrecordedrelayevents.TheeventsandtheassociateddataisavailableforviewingutilizingtheM-3820DIPScomCommunicationsSoftware.

CalculationsCurrent and Voltage RMS Values: UsesDiscreteFourierTransformalgorithmonsampledvoltageandcurrentsignalstoextractfundamentalfrequencyphasorsforrelaycalculations. RMScalculationforthe50,51N,59and27functions,andthe24functionareobtainedusingthetimedomainapproachtoobtainaccuracyoverawidefrequencyband.WhentheRMSoptionisselected,themagnitudecalculationfor59and27functionsisaccurateoverawidefrequencyrange(10to80Hz).WhentheDFToptionisselected,themagnitudecalcula-tionisaccuratenearnominalfrequency(50Hz/60Hz)butwilldegradeoutsidethenominalfrequency.For50and51NfunctionstheDFTisusedwhenthefrequencyis55Hzto65Hzfor60Hz(nominal)and45Hzto55Hzfor50Hz(nominal),outsideofthisrangeRMScalculationisused.

Power Input OptionsNominal110/120/230/240Vac,50/60Hz,ornominal110/125/220/250Vdc.Operatesproperlyfrom85Vacto265Vacandfrom80Vdcto312.5Vdc.Withstands300Vacor315Vdcfor1second.Nominalburden40VAat120Vac/125Vdc.

Nominal24/48Vdc,operatesproperlyfrom18Vdcto56Vdc,withstands65Vdcfor1second.Burden25VAat24Vdcand30VAat48Vdc.

AnoptionalredundantpowersupplyisavailableforunitsthatarepurchasedwithouttheexpandedI/O.

ForthoseunitspurchasedwiththeexpandedI/O,theunitincludestwopowersupplieswhicharerequiredtopowertherelay.Burden(nominal)46VA@120Vac.

Sensing InputsFive Voltage Inputs: Ratedforanominalvoltageof50Vacto140Vacat60Hzor50Hz.Willwithstand240Vcontinuousvoltageand360Vfor10seconds.Sourcevoltagesmaybeline-to-groundorline-to-lineconnected.PhasesequenceABCorACBissoftwareselectable.Voltagetransformerburdenlessthan0.2VAat120Vac.

Seven Current Inputs: Ratednominal current (IR) of 5.0Aor1.0Aat 60Hzor50Hz.Willwithstand3IR continuouscurrentand100IRfor1second.Currenttransformerburdenislessthan0.5VAat5A,or0.3VA at1A.

Control/Status InputsThecontrol/statusinputs,INPUT1throughINPUT6,canbeprogrammedtoblockanyrelayprotectivefunction,totriggertheoscillographrecorder,tooperateoneormoreoutputsorcanbeaninputintoIPSlogic.ToprovidebreakerstatusLEDindicationonthefrontpanel,theINPUT1control/statusinputcontactmustbeconnectedtothe52bbreakerstatuscontact.Theminimumcurrentvaluetoinitiate/pickupanInputis>25mA.

TheoptionalexpandedI/Oincludesanadditional8programmablecontrol/statusinputs(INPUT7throughINPUT14).

▲ CAUTION:Thecontrol/statusinputsshouldbeconnectedtodrycontactsonly,andareinternallyconnected(wetted)witha24Vdcpowersupply.

Output ContactsAnyofthefunctionscanbeindividuallyprogrammedtoactivateanyoneormoreoftheeightprogrammableoutputcontactsOUTPUT1throughOUTPUT8.Anyoutputcontactcanalsobeselectedaspulsedorlatched.IPSlogiccanalsobeusedtoactivateanoutputcontact.

TheoptionalexpandedI/Oincludesanadditional15programmableoutputcontacts(OUTPUT9throughOUT-PUT23).ThesecontactsareconfigurableonlyusingIPScomsoftware.

Theeightoutputcontacts(sixform‘a’andtwoform‘c’),thepowersupplyalarmoutputcontact(form‘b’),the self-testalarmoutputcontact(form‘c’)andtheoptional15expandedI/Ooutputcontacts(form'a')areallratedperANSI/IEEEC37.90-1989fortripping.Make30Afor0.2seconds,carry8A,break6Aat120Vac,break0.5Aat48Vdc;0.3A,125Vdc;0.2A,250VdcwithL/R=40mSec.

–14–


IPSlogicThisfeaturecanbeprogrammedutilizingtheIPScom®CommunicationsSoftware.IPSlogictakesthecontactinputstatusandfunctionstatus,andbyemploying(OR,AND,andNOT)booleanlogicandatimer,canactivateanoutputorchangesettingprofiles.

Target/Status Indicators and ControlsTheRELAY OK LEDrevealspropercyclingofthemicrocomputer.TheBRKR CLOSEDLEDwillilluminatewhenthebreakerisclosed(whenthe52bcontactinputisopen).TheOSC TRIGLEDindicatesthatoscillographicdatahasbeenrecordedintheunit'smemory.TheTARGETLEDwillilluminatewhenanyoftherelayfunctionsoperate.PressingandreleasingtheTARGET RESETbuttonresetsthetargetLEDiftheconditionscausingtheoperationhavebeenremoved.HoldingtheTARGET RESETpushbuttondisplaysthepresentpickupstatusoftherelayfunctions.ThePS1andPS2LEDswillremainilluminatedaslongaspowerisappliedtotheunitandthepowersupplyisoperatingproperly.TIME SYNCLEDilluminateswhenvalidIRIG-Bsignalisappliedandtimesynchronizationhasbeenestablished.

CommunicationCommunicationsportsincluderearpanelRS-232andRS-485ports,afrontpanelRS-232port,arear-panelIRIG-BportandanEthernetport(optional).Thecommunicationsprotocolimplementsserial,byte-oriented,asynchronouscommunication,providing the following functionswhenusedwith theWindows™-compatibleM-3820DIPScom®CommunicationsSoftware.MODBUSandBECO2200protocolsaresupportedproviding:

• Interrogationandmodificationofsetpoints

• Time-stampedinformationforthe32mostrecenttrips

• Real-timemeteringofallquantitiesmeasured

• DownloadingofrecordedoscillographicdataandSequenceofEventsRecorderdata.

TheoptionalEthernetportcanbepurchasedwithMODBUSoverTCP/IPandBECO2200overTCP/IPprotocolsorwiththeIEC61850protocol.

IRIG-BTheM-3425AGeneratorProtectionRelaycanaccepteithermodulatedordemodulatedIRIG-Btimeclocksyn-chronizationsignal.TheIRIG-Btimesynchronizationinformationisusedtocorrectthehour,minutes,seconds,andmillisecondsinformation.

HMI Module (optional)Local access to the relay is provided through an optionalM-3931HMI (Human-Machine Interface)Mod-ule,allowing foreasy-to-use,menu-drivenaccess toall functionsutilizingsixpushbuttonsanda2-lineby 24characteralphanumericvacuumflorescentdisplay.FeaturesoftheHMIModuleinclude:

• User-definableaccesscodesthatallowthreelevelsofsecurity

• Interrogationandmodificationofsetpoints

• Time-stampedinformationforthe32mostrecenttrips

• Real-timemeteringofallquantitiesmeasured

Target Module (optional)AnoptionalM-3925ATargetModuleprovides24targetand8outputLEDs.AppropriatetargetLEDswillillumi-natewhenthecorrespondingfunctionoperates.ThetargetscanberesetwiththeTARGET RESETpushbutton.TheOUTPUTLEDsindicatethestatusoftheprogrammableoutputrelays.

–15–


Temperature Controller MonitoringAnyTemperatureControllerequippedwithacontactoutputmaybeconnectedtotheM-3425Aandcontrolledby the relay'sprogrammable IPSlogic function.Figure1 isanexampleofa typicalTemperatureControllerMonitoring application.TheOmron E5C2Temperature Controller is a DIN rail mounted RTD interface totheM-3425AGeneratorProtectionrelay.TheE5C2acceptstypeJorKthermocouples,platinumRTDsor thermistorsas its input.Supplyvoltage for theE5C2accepts110/120Vac,50/60Hz,or220/240Vac 50/60Hzor24Vdc.

TemperatureController

Omron E5C2P.D. 750

or equivalent

IN X

IN RTN

M-3425A

IPSlogic

Alarm/TripR1C

R2

Figure 1 Typical Temperature Controller Monitoring Application

I/O Expansion (optional)OptionalI/OExpansionprovidesanadditional15form'a'outputcontactsandanadditional8control/statusinputs.OutputLEDsindicatethestatusoftheoutputrelays.

Tests and StandardsTherelaycomplieswiththefollowingtypetestsandstandards:

Voltage Withstand

Dielectric WithstandIEC60255-5 3,500Vdcfor1minuteappliedtoeachindependentcircuittoearth 3,500Vdcfor1minuteappliedbetweeneachindependentcircuit 1,500Vdcfor1minuteappliedtoIRIG-Bcircuittoearth 1,500Vdcfor1minuteappliedbetweenIRIG-Btoeachindependentcircuit 1,500Vdcfor1minuteappliedbetweenRS-485toeachindependentcircuit

Impulse VoltageIEC60255-5 5,000Vpk,+/-polarityappliedtoeachindependentcircuittoearth 5,000Vpk,+/-polarityappliedbetweeneachindependentcircuit 1.2by50µs,500ohmsimpedance,threesurgesat1every5seconds

Insulation ResistanceIEC60255-5 >100Megaohms

–16–


Electrical Environment

Electrostatic Discharge TestEN60255-22-2 Class4(8kV)—pointcontactdischarge

EN60255-22-2 Class4(15kV)–airdischarge

Fast Transient Disturbance TestEN60255-22-4 ClassA(4kV,2.5kHz)

Surge Withstand CapabilityANSI/IEEE 2,500Vpk-pkoscillatoryappliedtoeachindependentcircuittoearthC37.90.1- 2,500Vpk-pkoscillatoryappliedbetweeneachindependentcircuit1989 5,000VpkFastTransientappliedtoeachindependentcircuittoearth 5,000VpkFastTransientappliedbetweeneachindependentcircuit

ANSI/IEEE 2,500Vpk-pkoscillatoryappliedtoeachindependentcircuittoearthC37.90.1- 2,500Vpk-pkoscillatoryappliedbetweeneachindependentcircuit2002 4,000VpkFastTransientburstappliedtoeachindependentcircuittoearth 4,000VpkFastTransientburstappliedbetweeneachindependentcircuit

NOTE: Thesignalisappliedtothedigitaldatacircuits(RS-232,RS-485,IRIG-B,Ethernetcommunicationportandfieldgroundcouplingport)throughcapacitivecouplingclamp.

Radiated SusceptibilityANSI/IEEE 25-1000Mhz@35V/mC37.90.2

Output ContactsANSI/IEEE Make30Afor0.2seconds,offfor15secondsfor2,000operations,perSection6.7.1,TrippingC37.90.0 OutputPerformanceRequirements

Atmospheric Environment

TemperatureIEC60068-2-1 Cold,–20°CIEC60068-2-2 DryHeat,+70°CIEC60068-2-3 DampHeat,+40°C@93%RH

Mechanical Environment

VibrationIEC60255-21-1 VibrationresponseClass1,0.5g VibrationenduranceClass1,1.0g

IEC60255-21-2ShockResponseClass1,5.0g ShockWithstandClass1,15.0g BumpEnduranceClass1,10.0g

Compliance UL-Listedper508 – IndustrialControlEquipment

–17–


UL-ListedComponentper508ATableSA1.1IndustrialControlPanels

CSA-CertifiedperC22.2No.14-95 – IndustrialControlEquipment

CESafetyDirective–EN61010-1:2001,CATII,PollutionDegree2

PhysicalWithout Optional Expanded I/O

Size: 19.00"widex5.21"highx10.20"deep(48.3cmx13.2cmx25.9cm)

Mounting: Theunitisastandard19",semiflush,three-unithigh,rack-mountpaneldesign,conformingtoANSI/EIARS-310CandDIN41494Part5specifications.Verticalorhorizontalpanel-mountoptionsareavailable.

Approximate Weight: 17lbs(7.7kg)

Approximate Shipping Weight: 25lbs(11.3kg)

With Optional Expanded I/O

Size: 19.00"widex6.96"highx10.2"deep(48.3cmx17.7cmx25.9cm)

Mounting: Theunitisastandard19",semiflush,four-unithigh,rack-mountpaneldesign,conformingtoANSI/EIARS-310CandDIN41494Part5specifications.Verticalorhorizontalpanel-mountoptionsareavailable.

Approximate Weight: 19lbs(8.6kg)

Approximate Shipping Weight: 26lbs(11.8kg)

Recommended Storage Parameters

Temperature: 5°Cto40°C

Humidity:Maximumrelativehumidity80%fortemperaturesupto31°C,decreasingto31°Clin-earlyto50%relativehumidityat40°C.

Environment:Storageareatobefreeofdust,corrosivegases,flammablematerials,dew, percolatingwater,rainandsolarradiation.

See M-3425A Instruction Book, Appendix E, Layup and Storage for additional information.

Patent & WarrantyTheM-3425AGeneratorProtectionRelayiscoveredbyU.S.Patents5,592,393and5,224,011.

TheM-3425AGeneratorProtectionRelayiscoveredbyafiveyearwarrantyfromdateofshipment.

Specification subject to change without notice.

External ConnectionsM-3425AexternalconnectionpointsareillustratedinFigures2and3.

–18–


Figu

re 2

Ex

tern

al C

onne

ctio

ns (W

ithou

t Opt

iona

l Exp

ande

d I/O

)

N

OT

ES:

1.SeeM-3425AInstructionBookSection2.3,SetpointsandTimeSettings,subsectionfor64B/FFieldGroundProtection.

2.BeforemakingconnectionstotheTripCircuitMonitoringinput,seeM-3425AInstructionBookSection5.5,CircuitBoardSwitchesandJumpers,

fortheinformationregardingsettingTripCircuitMonitoringinputvoltage.Connectingavoltageotherthanthevoltagethattheunitisconfigured

tomayresultinmis-operationorpermanentdamagetotheunit.

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8 W

AR

NIN

G: O

NLY

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Y C

ON

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st b

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ause

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ese

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xpan

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N

OT

ES:

1.SeeM-3425AInstructionBookSection2.3,SetpointsandTimeSettings,subsectionfor64B/FFieldGroundProtection.

2.BeforemakingconnectionstotheTripCircuitMonitoringinput,seeM-3425AInstructionBookSection5.5,CircuitBoardSwitchesandJumpers,

fortheinformationregardingsettingTripCircuitMonitoringinputvoltage.Connectingavoltageotherthanthevoltagethattheunitisconfigured

tomayresultinmis-operationorpermanentdamagetotheunit.

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AR

NIN

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Y C

ON

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–20–


50DT

Utility System

52Unit

52Gen

50BFPh

87

492132 504078 60FL 51V 50/27

27

81R 81 27 59 24

64F 64B

M-3921+

-

CT

VT

M-3425A

87GD 50N

50BFN 51N

R

64S27TN27

32R

High-impedance Grounding with ThirdHarmonic 100% Ground Fault Protection

Low-impedance Grounding with Ground Differentialand Overcurrent Stator Ground Fault Protection

These functions are available inthe Comprehensive Package. Asubset of these functions are alsoavailable in a Base Package.

This function is available as aoptional protective function.

This function provides control forthe function to which it points.

M-3425A TypicalConnection Diagram

25

59D

VT (Note 1)

Targets(Optional)

Integral HMI(Optional)

Metering

Waveform Capture

IRIG-B

Front RS232Communication

Multiple SettingGroups

Programmable I/O

Self Diagnostics

Dual Power Supply(Optional)

Rear Ethernet Port (Optional)

Rear RS-485Communication

BreakerMonitoring

Trip CircuitMonitoring

67N67N Polarization(Software Select)

81A

50N50BFN 51N

46

59X

59N

3VO (Calculated)VX

VN

3IO

IN

67N Operating Current(Software Select)

VT (Note 1)

(Note 3)

(Note 5)

CT (Residual)(Note 4)

59D Line SideVoltage

(Software Select)

VX3VO (Calculated)

CT (Neutral)(Notes 2 & 5)

CTM

(Metering)

M

(Metering)

Rear RS232Communication

Event Log

NOTES: 1. When25functionisenabled,59X,59DwithVXand67NwithVXarenotavailable,andviceversa. 2. When67NfunctionwithIN(Residual)operatingcurrentisenabled,87GDisnotavailable,andvice

versa. 3. WhenVTsourceisusedasaturn-to-turnfaultprotectiondevice(SeeM-3425AInstructionBook,

Chapter2,Application,foradditional59Xapplications.) 4. ThecurrentinputINcanbeconnectedeitherfromneutralcurrentorresidualcurrent. 5. The50BFN,50N,51N,59D,67N(withINorVN)and87GDfunctionsareunavailablewhenthe64S

functionhasbeenpurchased.SeetheM-3425AInstructionBookforconnectiondetails.

Figure 4 One‑Line Functional Diagram (Configured with Phase Differential)

–21–


Utility System

52Unit

52Gen

81R 81 59 27 24

M-3921+

-

VT

CT

M-3425A

50N 51N

R

CT27

32R

High-impedance Grounding with ThirdHarmonic 100% Ground Fault Protection

Low-impedance Grounding withOvercurrent Stator Ground Fault Protection

These functions are available inthe Comprehensive Package. Asubset of these functions are alsoavailable in a Base Package.

This function is available as aoptional protective function.

This function provides control forthe function to which it points.

M-3425A TypicalConnection Diagram(Configured for Split-Phase Differential)

25

59D

50DT

67N

Targets(Optional)

Integral HMI(Optional)

Metering

Waveform Capture

IRIG-B

Front RS232Communication

Multiple SettingGroups

Programmable I/O

Self Diagnostics

Dual Power Supply(Optional)

Rear EthernetPort (Optional)

Rear RS-485Communication

BreakerMonitoring

Trip CircuitMonitoring

27TN

81A

46492132 504078 60FL 51V 50/27

2764F 64B

59X

64S 59N

CT (Residual)(Note 5)

VT (Note 1)

VT (Note 1)

67N Polarization(Software Select)

3VO (Calculated)

VX

VN

(Note 2)

CT (Note 3)

(Note 4)

59D Line SideVoltage

(Software Select)

VX 3VO (Calculated)

CT (Neutral)(Note 5)

M

(Metering)

M

(Metering)

Rear RS232Communication

Event Log

NOTES:

1. When25functionisenabled,59X,59DwithVXand67NwithVXarenotavailable,andviceversa.

2. Whenusedasaturn-turnfaultprotectiondevice.

3. CTsareconnectedforsplit-phasedifferentialcurrent.

4. 67NoperatingcurrentcanonlybeselectedtoIN(Residual)forthisconfiguration.

5. Thecurrentinput(IN)canbeconnectedeitherfromneutralcurrentorresidualcurrent.

6. The50BFN,50N,51N,59D,67N(withINorVN)and87GDfunctionsareunavailablewhenthe64Sfunctionhasbeenpurchased.SeetheM-3425AInstructionBookforconnectiondetails.

Figure 5 One‑Line Functional Diagram (configured for split‑phase differential)

–22–


Standard 19" Horizontal Mount Chassis

19.00[48.26]

17.50[44.45]

17.50[44.45]

ACTUAL

5.21[13.23]

ACTUAL

0.40 [1.02] X 0.27[0.68] Slot (4X)

10.20[25.91]

19.00[48.26]

18.31[46.51]

0.35[0.89]

1.48[3.76]

2.25[5.72]

NOTE: Dimensions in brackets are in centimeters. NOTES:1.Dimensionsinbracketsareincentimeters.

2.SeeInstructionBookChapter5forMountingandCutoutinformation.

Figure 6 Horizontal Unit Dimensions Without Expanded I/O (H1)

–23–


1.67[4.24]

19.00[48.26]

18.31[46.51]

2.25[5.72]

0.28 [0.71]Dia. (4X)

17.68[44.91]

5.59[14.20]Actual

1.67[4.24]

2.25[5.72]

10.20[25.91]

COM 1

TARGETS

OUT 1

OUT 2

OUT 3

OUT 4

OUT 5

OUT 6

OUTPUTSOUT 7

OUT 8

EXIT ENTER

TARGET DIAG

TIME

OSC.TRIG

SYNC

BRKRCLOSED

OKRELAY

TARGETRESET

PS 2 PS 1

17.5[44.45]

ACTUAL

5.65[14.40]

Recommended cutout when relay is not used asstandard rack mount and is panel cut out mounted.

19.00[48.26]

17.50[44.45]

0.35[0.89]

0.03[0.076]

NOTE: Dimensions in brackets are in centimeters. NOTES:1.Dimensionsinbracketsareincentimeters.


Figure 7 Vertical Unit Dimensions Without Expanded I/O (H2)

–24–


Figure 8 M-3425A Vertical Unit Layout

50

Hz

60

Hz

SE

RIA

LN

O.

MO

DE

L: M-3425A

FIRM

WA

RE

: D-0150

659

IRIG- B

35

36

6 4 F

RA

TE

DV

OL

TA

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PS 1

OSC.TRIG

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M-3425AGENERATORPROTECTION

250V,

–25–


0.35[0.89]

18.31[46.51]

NOTES:1.Dimensionsinbracketsareincentimeters.


Figure 9 Horizontal and Vertical Unit Dimensions With Expanded I/O (H5 and H6)

–26–


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IN 7

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IN 13

IN 12

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INPUTS

OUTPUTS

15

16

17

18

19

20

21

22

23

9

10

11

12

13

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CHIWK T

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Made in U.S.A.

M-3425AGENERATORPROTECTION

NOTES:1. The M-3425A Expanded I/O vertical panel is the same physical size as the M-3425A Expanded I/O horizontal panel. See Figure 7 for dimennsions.2. See Instruction Book Section 5 for Mounting and Cutout information.

U.S. PATENT5,592,3935,224,011

Figure 10 M-3425A Expanded I/O Vertical Unit Layout

–27–


M-3921 Field Ground Coupler

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Figure 11 Field Ground Protection Block Diagram

NOTES: 1. Theabovecircuitmeasuresinsulationresistance(Rf)betweenrotorfieldwindingandground(64F).

2. Relayinjects15Vsquarewave(Vout)andmeasuresreturnsignal(Vf)tocalculateRf.

3. Theinjectionfrequencycanbeset(0.1to1.0Hz)basedontherotorcapacitance,inordertoimproveaccuracy.

4. Thesignalrisetimeisanalyzedtodetermineifshaftbrushesareliftingoropen(64B).

5. Mayalsobeappliedongeneratorswithbrushlessexcitationwithagroundingbrushandpilotgroundfaultdetectionbrush.

Function SpecificationField/Exciter Supply Voltage Rating(Terminal(3)to(2)):

• 60to1200Vdc,continuous

• 1500Vdc,1minute

Operating Temperature:–20°to+70°,Centigrade

Patent & WarrantyTheM-3921FieldGroundCoupleriscoveredbyafive-yearwarrantyfromdateofshipment.

–28–


Tests and StandardsM-3921FieldGroundCouplercomplieswiththefollowingtestsandstandards:

Voltage Withstand

Isolation5kVacfor1minute,allterminalstocase

Impulse VoltageIEC60255–5, 5,000 V pk, 1.2 by 50 µs, 0.5 J, 3 positive and 3 negative impulses at 5 second intervalsperminute

Electrical InterferenceElectrostatic Discharge TestEN60255-22-2 Class4(8kV)—pointcontactdischarge Class4(15kV)—airdischarge

Fast Transient Disturbance TestsIEC61000-4-4 Class4(4kV,2.5kHz)

Surge Withstand CapabilityANSI/IEEE 2,500Vpk-pkoscillatoryappliedtoeachindependentcircuittoearthC37.90.1- 2,500Vpk-pkappliedbetweeneachindependentcircuit1989 5,000VpkFastTransientappliedtoeachindependentcircuittoearth 5,000VpkFastTransientappliedbetweeneachindependentcircuit

ANSI/IEEE 2,500Vpk-pkoscillatoryappliedtoeachindependentcircuittoearthC37.90.1- 2,500Vpk-pkappliedbetweeneachindependentcircuit2002 4,000VpkFastTransientappliedtoeachindependentcircuittoearth 4,000VpkFastTransientappliedbetweeneachindependentcircuit

NOTE: Thesignalisappliedtothedigitaldatacircuits(RS-232,RS-485,IRIG-B,Ethernetcommunicationportandfieldgroundcouplingport)throughcapacitivecouplingclamp.

Radiated SusceptibilityANSI/IEEE 25-1000Mhz@35V/mC37.90.2

Atmospheric EnvironmentIEC60068–2–1Cold,–20°CIEC60068–2–2 DryHeat,+70°CIEC60068–2–3DampHeat,+40°C@93%RH

Enclosure ProtectionNEMA1,IECIPC-65

–29–


.18

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Figure 12 M-3921 Field Ground Coupler Mounting Dimensions

–30–


64S 100% Stator Ground Protection by Low Frequency Signal Injection NOTE: TheStatorGroundProtectionfunction(64S)mustbeselectedwhentheM-3425Aisinitiallyordered.

The100%statorgroundfaultprotectionisprovidedbyinjectinganexternal20Hzsignalintotheneutralofthegenerator.Theprotectionisprovidedwhenthemachineison-lineaswellasoff-line(providedthatthe20Hzgeneratorandrelayarepoweredon.)ThisschemerequiresthefollowingexternalcomponentsinadditiontoM-3425Aprotectionsystem:

• 20HzSignal-generator(BECOSurfaceMount/FlushPartNo.430-00426)(Siemens7XT33)

• Band-passfilter(BECOSurfaceMount/FlushPartNo.430-00427)(Siemens7XT34)

• 20 Hz Measuring Current Transformer, 400/5 A CT (BECO Par t No. 430-00428) (ITI-CTW3-60-T50-401)

Thevoltagesignalgeneratedbythe20Hzsignal-generatorisinjectedintothesecondaryofthegeneratorneu-tralgroundingtransformerthroughaband-passfilter.Theband-passfilterpassesthe20Hzsignalandrejectsout-of-bandsignals.Theoutputofthe20Hzband-passfilterisconnectedtotheVNinputoftheM-3425Arelaythroughasuitablevoltagedivider,thatlimitstheM-3425AtoO200Vac(thevoltagegeneratormaybebypassediftheexpected50/60Hzvoltageduringaphase-to-groundfaultofthegeneratorisO 200V.)The20HzcurrentisalsoconnectedtotheINinputoftheM-3425A,throughthe20Hzcurrenttransformer.

Whenthegeneratorisoperatingnormally(nogroundfault)onlyasmallamountof20Hzcurrentwillflowasaresultofthestatorcapacitancetoground.Whenagroundfaultoccursanywhereonthegeneratorstatorwindingsthe20Hzcurrentwillincrease.The64Sfunctionwillissueatripsignalafterasettimedelaywhenthemeasured20Hzcurrentexceedsthepickupcurrent.

ForcaseswheretheLoadResistor(RN)issmall,theUndervoltageInhibitshouldnotbeenabled,asthevolt-agewillbesmall.

The59Nfunction(90to95%)shouldalsobeusedinconjunctionwith64Sprotectiontoprovidebackup.

–31–


RN

1B1

1A1

1B4

1A3

1A4

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Figure 13 64S Function Component Connection Diagram (Model A00/EE 20 Hz Signal Generator)

–32–


20 Hz Signal Generator Function Specifications

Auxiliary VoltageRatedauxiliaryvoltageUHac 3x(100/120Vac),50/60Hz1x(100to120Vac),50/60Hz

Permissiblevariationsac 88to230Vac

OR

RatedauxiliaryvoltageUHdc 110to220Vdc

PermissibleVariationsdc 88to250Vdc

Permissibleconsumptionat8Ohmimpendance O100VA

NOTE: 230VACispermissibleforcommissioningonly,whichislimitedintime.

20 Hz Output VoltageConnections(11and12)

OutputVoltage approx.26V±10%,rectangular;20Hz0.1Hz

PowerOutput,permanently 100VAoverallranges

NOTE: Outputisnotresistanttoshort-circuits.

Binary Input for BlockingConnections(6and8)

SwitchingThreshold Adjustablevoltagerangewithjumper

–Forcontrolvoltages 24V 48V 60V DC19V:Uhigh P DC19V,Ulow O DC10V

–Forcontrolvoltages 110V 125V 220V 250V DC88V:Uhigh P DC88V,Ulow O DC44V

Permissiblevoltage,continuous 300Vdc

Life ContactConnections(5,7and9)

SwitchingcapacityMAKE 30W/VA BREAK 20VA 30Wresistanceload 25W@L/RO50ms

Switchingvoltage DC24VtoDC250V AC24toAC230V

Permissiblecurrent 1Apermanent

Permissible Ambient TemperaturesRLdescribestheloadresistanceattheBandPassoutput.

withRL 5Ohm O700CorO1580F

NOTE: Withmaximumpoweroutput,thedevicehasapowerlossofapproximately24W.Toensureunhin-deredheatdissipationthroughtheventholes,thedistancetootherdeviceslocatedatthetopandbottommustbeatleast100mm.Thisdevicemustthereforealwaysbemountedinthebottompartofthecabinet.

–33–


NOTE: DetailedMountinginformationiscontainedintheM-3425AInstructionBookChapter5,InstallationSection5.6.

Figure 14 20Hz Signal Generator Dimensions

Dimensions in mm

–34–


Band-pass Filter Specifications

Load Capacity of the 20 Hz Band-pass FilterConnections(1B1-1B4)

Permissiblevoltage,continuous 55Vac

PermissiblevoltageforO30s 550Vac

Frequencyofsuperimposedacvoltage P45Hz

Overloadcapability,continuous 3.25Aac

TestVoltage 2.8kVdc

Load Capability of the Voltage Divider CircuitConnections(1A1-1A4):

Permissiblevoltage,continuous 55Vac

PermissiblevoltageforO30s 50Vac

TestVoltage 2.8kVdc

Permissible Ambient TemperatureswithRL 5Ωburden O550CorO1310F

NOTE: Thedevicemayproduceupto75Wpowerlossesduringservice.Inordertopreventheatpockets,thedissipationofthelossesmustnotberestricted.Theminimumclearanceaboveandbelowthedevicetootherunitsorwallsis100mmor4inches.Incubicles,thedeviceshallbeinstalledinthebottomarea.

–35–


Figure 16 20 Hz Measuring Current Transformer 400‑5 A CT

NOTE: DetailedMountinginformationiscontainedintheM-3425AInstructionBookChapter5,InstallationSection5.

Figure 15 Band‑pass Filter Dimensions

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DANGER! HIGH VOLTAGE

– This sign warns that the area is connected to a dangerous high voltage, and youmust never touch it.

PERSONNEL SAFETY PRECAUTIONSThe following general rules and other specific warnings throughout the manual must be followed during application,test or repair of this equipment. Failure to do so will violate standards for safety in the design, manufacture, and intendeduse of the product. Qualified personnel should be the only ones who operate and maintain this equipment. BeckwithElectric Co., Inc. assumes no liability for the customer’s failure to comply with these requirements.

– This sign means that you should refer to the corresponding section of the operation

manual for important information before proceeding.

Always Ground the Equipment

To avoid possible shock hazard, the chassis must be connected to an electrical ground. When servicingequipment in a test area, the Protective Earth Terminal must be attached to a separate ground securelyby use of a tool, since it is not grounded by external connectors.

Do NOT operate in an explosive environmentDo not operate this equipment in the presence of flammable or explosive gases or fumes. To do so wouldrisk a possible fire or explosion.

Keep away from live circuitsOperating personnel must not remove the cover or expose the printed circuit board while power is ap-plied. In no case may components be replaced with power applied. In some instances, dangerous volt-ages may exist even when power is disconnected. To avoid electrical shock, always disconnect power anddischarge circuits before working on the unit.

Exercise care during installation, operation, & maintenance proceduresThe equipment described in this manual contains voltages high enough to cause serious injury or death.Only qualified personnel should install, operate, test, and maintain this equipment. Be sure that all per-sonnel safety procedures are carefully followed. Exercise due care when operating or servicing alone.

Do not modify equipmentDo not perform any unauthorized modifications on this instrument. Return of the unit to a BeckwithElectric repair facility is preferred. If authorized modifications are to be attempted, be sure to followreplacement procedures carefully to assure that safety features are maintained.

PRODUCT CAUTIONSBefore attempting any test, calibration, or maintenance procedure, personnel must be completely familiarwith the particular circuitry of this unit, and have an adequate understanding of field effect devices. If acomponent is found to be defective, always follow replacement procedures carefully to that assure safetyfeatures are maintained. Always replace components with those of equal or better quality as shown in theParts List of the Instruction Book.

Avoid static chargeThis unit contains MOS circuitry, which can be damaged by improper test or rework procedures. Careshould be taken to avoid static charge on work surfaces and service personnel.

Use caution when measuring resistancesAny attempt to measure resistances between points on the printed circuit board, unless otherwise notedin the Instruction Book, is likely to cause damage to the unit.

NOTE

The following features, described in this Instruction Book, are only available for firmware versionD-0150-V01.00.34 and later:

59N 20 Hz Injection Mode (Page 2-58)

IEEE curves for 51N, 51V, and 67N functions (Appendix D)

Sequence of Events Recorder (Page 4-18)

Dropout/Reset Time Delay added to IPSlogic (Page 2-91)

Response Time Delay for Communications (Page 4-3)

25 Function (does not produce a target) (Page 2-21)

This Page Left Intentionally Blank

i

Table of Contents

Chapter 1 Introduction

1.1 Instruction Book Contents ............................................................................1–1

1.2 M-3425A Generator Protection Relay ...........................................................1–2

1.3 Accessories ..................................................................................................1–4

Chapter 2 Application

2.1 Configuration .....................................................................................................2–2 Profiles ...............................................................................................................2–3 Functions ...........................................................................................................2–3 Special Considerations ......................................................................................2–3 Relay System Setup ..........................................................................................2–3

2.2 System Diagrams ..............................................................................................2–8

2.3 Setpoints and Time Settings ............................................................................2–14 21 Phase Distance ..........................................................................................2–14 24 Overexcitation Volts/Hz ...............................................................................2–18 M-3425A Firmware Versions D-0114VXX.XX.XX and Earlier .........................2–19 M-3425A Firmware Version D-0150V 01.00.34 ...............................................2–19 M-3425A Firmware Version D-0150V 01.04.00 ...............................................2–19 25 Sync Check.................................................................................................2–21 Phase Angle Check .........................................................................................2–21 Delta Voltage and Delta Frequency Check ......................................................2–21 27 Phase Undervoltage ...................................................................................2–25 27TN #2 Screens are identical to 27TN #1. .....................................................2–28 32 Directional Power ........................................................................................2–29 Protection from Generator Motoring ................................................................2–29 Protection from Generator Overload................................................................2–29 Protection from Excessive Reactive Power .....................................................2–29 40 Loss of Field ...............................................................................................2–33 46 Negative Sequence Overcurrent ................................................................2–37 49 Stator Overload Protection ........................................................................2–39 50/50N Instantaneous Overcurrent, Phase and Neutral Circuits .....................2–42 50BF Generator Breaker Failure/HV Breaker Flashover .................................2–44 50DT Definite Time Overcurrent (for split-phase differential) ...........................2–46 50/27 Inadvertent Energizing ...........................................................................2–47 51N Inverse Time Neutral Overcurrent ............................................................2–49 51V Inverse Time Phase Overcurrent with Voltage Control/Restraint ..............2–50 59 Phase Overvoltage .....................................................................................2–52 59D Third Harmonic Voltage Differential (Ratio) ..............................................2–53 59N Overvoltage, Neutral Circuit or Zero Sequence .......................................2–55 59X Multipurpose Overvoltage (Turn-to-Turn Stator Fault Protection or Bus Ground Protection) ...............................................................................2–56

TABLE OF CONTENTSM-3425A Generator Protection

Instruction Book

ii

M-3425A Instruction Book

Chapter 2 Application (Cont.'d)

60FL VT Fuse Loss .........................................................................................2–58 Internal Fuse Loss Detection Logic .................................................................2–58 External Fuse-Loss Function ...........................................................................2–58 60FL VT Fuse Loss Alarm Function ................................................................2–58 64B/F Field Ground Protection ........................................................................2–61 64F Field Ground Detection ............................................................................2–61 Factors Affecting 64F Performance .................................................................2–61 64B Brush Lift-Off Detection ............................................................................2–63 64S 100% Stator Ground Protection by Low Frequency Signal Injection .......2–65 67N Residual Directional Overcurrent .............................................................2–71 78 Out-of-Step .................................................................................................2–74 81 Frequency ...................................................................................................2–77 81A Frequency Accumulator ...........................................................................2–79 81R Rate of Change of Frequency ..................................................................2–81 87 Phase Differential .......................................................................................2–82 87GD Ground (Zero Sequence) Differential ....................................................2–84 Breaker Monitoring ..........................................................................................2–85 Trip Circuit Monitoring ......................................................................................2–86 IPSlogic™ ........................................................................................................2–87 Settings and Logic Applicable when IPSlogic™ Function(s) programmed using IPScom® ..........................................................................2–89 DO/RST (Dropout/Reset) Timer Feature .........................................................2–91 Reset Delay Timer ...........................................................................................2–91 Dropout Delay Timer ........................................................................................2–91

Chapter 3 Operation

3.1 Front Panel Controls ..........................................................................................3–1 Alphanumeric Display ........................................................................................3–1 Screen Blanking ................................................................................................3–1 Arrow Pushbuttons ............................................................................................3–1 Exit Pushbutton..................................................................................................3–1 Enter Pushbutton ...............................................................................................3–1 Target & Status Indicators and Controls ............................................................3–1 Power Supply #1 (#2) LED ................................................................................3–2 Relay OK LED ...................................................................................................3–2 Oscillograph Recorded LED ..............................................................................3–2 Breaker Closed LED ..........................................................................................3–2 Target Indicators and Target Reset ....................................................................3–2 Time Sync LED ..................................................................................................3–2 Diagnostic LED ..................................................................................................3–2 Accessing Screens ............................................................................................3–2 Default Message Screens ............................................................................3–2

3.2 Initial Setup Procedure/Settings ...................................................................3–5

3.3 Setup Unit Data .................................................................................................3–5 Setup Unit Data Entry ........................................................................................3–5 Setu

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