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

PROTECTION

• Provides all major protective functions for generator protection, including Field Ground (64F), Out-of-Step (78), and Split-Phase Differential (50DT)

• Expanded IPScom® Communications Software provides simple and logical setting and programming

• Enhanced "pick and choose" functionality provides tailored applications at the lowest possible cost

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

–2–

M‑3425 Generator Protection Relay

Standard Protective Functions • Dual‑zone phase distance protection for phase

fault backup (21)

• Overexcitation (V/Hz) protection (24)

• Phase Undervoltage (27) protection

• 100% Stator Ground Fault protection via third harmonic neutral undervoltage (27TN)

• Sensitive dual‑setpoint Reverse Power, Low Forward Power or Overpower detection, one of which can be used for sequential tripping (32)

• Dual‑zone, offset‑mho Loss‑of‑Field protection (40)

• Sensitive Negative Sequence Overcurrent protection and alarm (46)

• Instantaneous Overcurrent (50) protection

• Inadvertent Generator Energizing protection (50/27)

• Generator Breaker Failure protection (50BF)

• Definite Time Overcurrent (50DT) can be used for split phase differential

• Instantaneous Overcurrent (50N) protection

• Neutral Inverse Time Overcurrent (51N)

• Three‑phase Inverse Time Overcurrent (51V)

• Phase Overvoltage (59)

• Generator Ground Fault protection (59N)

• VT Fuse‑Loss detection and blocking (60FL)

• Out‑of‑Step protection (78)

• Four‑step Over/Underfrequency (81) protection

• Two‑step Rate of Change of Frequency (81R)

• Generator Phase Differential protection (87)

• Ground Differential (87GD) protection

• External Function allows external devices to trip through M‑3425 Generator Protection Relay

Optional Protective Functions • Stator Thermal protection using positive

sequence inverse time overcurrent (51T)

• Field Ground protection (64F)

Standard Features • Eight programmable outputs and s ix

programmable inputs

• Oscillography recording

• Time‑stamped target storage for 24 events

• Metering of all measured parameters

• Three communications ports (two RS‑232 and one RS‑485)

• M‑3820C IPScom® Communications Software

• Includes MODBUS and BECO 2200 protocols

• Standard 19" rack‑mount design

• Removable printed circuit board and power supply

• Both 50 and 60 Hz models available

• Both 1A and 5 A rated CT inputs available

• Additional trip inputs for externally connected devices

• IRIG‑B time synchronization

• Operating Temperature: –20° C to +70° C

Optional Features • Redundant power supply

• M‑3925 Target Module

• M‑3931 Human‑Machine Interface (HMI) Module

• M‑3801D IPSplot® PLUS Oscillograph Analysis Software

–3–


STANDARD PROTECTIVE FUNCTIONSDevice Setpoint Number Function Ranges Increment Accuracy†

Phase Distance (dual‑zone mho characteristic)

Circle Diameter #1, #2 0.1 to 100.0 Ω 0.1 Ω 0.1 Ω or 5% (0.5 to 500.0 Ω) (0.5 Ω or 5%)

Offset #1, #2 –100.0 to 100.0 Ω 0.1 Ω 0.1 Ω or 5% (–500.0 to 500.0 Ω) (0.5 Ω or 5%)

Impedance Angle #1, #2 0° to 90° 1° 1°

Time Delay #1, #2 1 to 8160 Cycles 1 Cycle 1 Cycle or 1%

Volts / Hz

Definite Time Pickup #1, #2 100 to 200% 1% 1%

Time Delay #1, #2 30 to 8160 Cycles 1 Cycle 25 Cycles

Inverse Time Characteristic Curves Inverse Time #1–#4 — —

Pickup 100 to 200% 1% 1%

Time Dial: Curve #1 1 to 100 1 Time Dial: Curves #2–#4 0.0 to 9.0 0.1

Reset Rate 1 to 999 Sec. 1 Sec. .02 Sec. or 1% (from threshold of trip)

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.

Third‑Harmonic Undervoltage, Neutral

Pickup #1, #2 0.3 to 20.0 V 0.1 V 0.15 V or 1%


Undervoltage Inhibit #1,#2 5 to 180 V 1 V 0.5 V or 0.5% (positive sequence)

Underpower Inhibit #1,#2 0.002 to 3.000 PU 0.001 PU 0.002 or 2%

RMS Undervoltage

Pickup #1, #2 5 to 180 V 1 V 0.5 V or 0.5% 0.8 V or 0.75%*

Time Delay #1, #2 1 to 8160 Cycles 1 Cycle 1 Cycle or 0.5%**

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

** When RMS (total waveform) is selected, timing accuracy is +20 cycles or 1%†.

Directional Power

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

Time Delay #1, #2 1 to 8160 Cycles 1 Cycle +16 Cycles or 1%

The per‑unit pickup is based on nominal VT secondary voltage and nominal CT secondary current settings. The 32 function can be selected as low forward power, reverse power, or overpower function.

†Select the greater of these accuracy values. Values in parentheses apply to 1 A CT secondary rating.

27

32

21

24

27TN

27

32

–4–


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

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

Circle Diameter #1, #2 0.1 to 100.0 Ω 0.1 Ω 0.1 Ω or 5%

(0.5 to 500.0 Ω) (0.5 Ω or 5%)

Offset #1, #2 –50.0 to 50.0 Ω 0.1 Ω 0.1 Ω or 5%

(–250.0 to 250.0 Ω) (0.5 Ω or 5%)


Voltage Control 5 to 180 V 1 V 0.5 V or 0.5% (positive sequence)

Directional Element Fixed at –13° — —

Voltage control for each zone can be individually enabled.

Negative Sequence Overcurrent

Definite Time Pickup 3 to 100% 1% 0.5% of 5 A (0.5% of 1 A)

Time Delay 1 to 8160 Cycles 1 Cycle 1 Cycle or 1%

Inverse Time Pickup 3 to 100% 1% 0.5 % of 5 A (0.5% of 1 A)

Time Dial Setting 1 to 95 1 3 Cycles or 3% (K= I2

2t)

Definite Maximum Time to Trip 600 to 65,500 Cycles 1 Cycle 1%

Definite Minimum Time 12 Cycles — fixed

Reset Time (Linear) 4 minutes — — (from threshold of trip)

Pickup is based on the generator nominal current setting.

Breaker Failure

Pickup Phase Current 0.10 to 10.00 A 0.01 A 0.1 A or 2% (0.02 to 2.00 A) (0.02 A or 2%)

Neutral Current 0.10 to 10.00 A 0.01 A 0.1 A or 2% (0.02 to 2.00 A) (0.02 A or 2%)


50BF can be initiated from designated M‑3425 output contacts or programmable inputs.

Instantaneous Overcurrent

Pickup 0.1 to 240.0 A 0.1 A 0.1 A or 3%

(0.1 to 48.0 A) (0.02 A or 3%)

Trip Time Response < 2 Cycles

40

46

50BF

50

50BF‑Ph

50BF‑N


–5–



Instantaneous Overcurrent, Neutral

Pickup 0.1 to 240.0 A 0.1 A 0.1 A or 3%

(0.1 to 48.0 A) (0.02 A or 3%)

Trip Time Response < 2 Cycles

Definite Time Overcurrent

Pickup Phase A #1, #2 0.20 A to 240.00 A 0.01 0.1 A or 3% (0.04 A to 48.00 A) (0.02 A or 3%)

Pickup Phase B #1, #2 (same as above)

Pickup Phase C #1, #2 (same as above)


When 50DT function is used for split‑phase differential protection, 50BF, 87, and 87GD functions are not available.

Inadvertent Energizing

Overcurrent Pickup 0.5 to 15.00 A 0.01 A 0.1 A or 2%

(0.1 to 3.00 A) (0.02 A or 2%)

Undervoltage Pickup 40 to 130 V 1 V 0.5 V

Pick‑up Time Delay 1 to 8160 Cycles 1 Cycle 1 Cycle or 1%

Drop‑out Time Delay 1 to 8160 Cycles 1 Cycle 1 Cycle or 1%

Inverse Time Neutral Overcurrent

Pickup 0.25 to 12.00 A 0.01 A 0.1 A or 1%

(0.05 to 2.40 A) (0.02 A or 1%)

Characteristic Curve Definite Time/Inverse/Very Inverse/Extremely Inverse/IEC Curves

Time Dial 0.5 to 11.0 0.1 3% or 3 Cycles 0.05 to 1.10 (IEC curves) 0.01

Inverse Time Overcurrent, with Voltage Control or Voltage Restraint

Pickup 0.5 to 12.0 A 0.01 A 0.1 A or 1% (0.10 to 2.40 A) (0.02 A or 1%)

Characteristic Curve Definite Time/Inverse/Very Inverse/Extremely Inverse/IEC Curves

Time Dial 0.5 to 11.0 0.1 3% or 3 Cycles 0.05 to 1.10 (IEC curves) 0.01

Voltage Control (VC) 5 to 180 V 1 V 0.5 V or 0.5% or Voltage Restraint (VR) Linear Restraint — —

51V

51N

50/27

50DT

50N

50

27


–6–



RMS Overvoltage

Pickup #1, #2 5 to 180 V 1 V 0.5 V or 0.5% 0.8 V to 0.75%*

Time Delay #1, #2 1 to 8160 Cycles 1 Cycle 1 Cycle or 1%**

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

** When RMS (total waveform) is selected, timing accuracy is +20 cycles or 1%.

RMS Overvoltage, Neutral

Pickup #1, #2 5.0 to 180.0 V 0.1 V 0.5 V to 0.5%


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 or from input contacts.


Out of Step (mho characteristic)

Circle Diameter 0.1 to 100.0 Ω 0.1 Ω 0.1 Ω or 5% (0.5 to 500.0 Ω) (0.5 Ω or 5%)

Offset –100.0 to 100.0 Ω 0.1 Ω 0.1 Ω or 5% (–500.0 to 500.0 Ω) (0.5 Ω or 5%)

Impedance Angle 0° to 90° 1° 1°

Blinder 0.1 to 50.0 Ω 0.1 Ω 0.1 Ω or 5% (0.5 to 250.0 Ω) (0.5 Ω or 5%)


Trip on mho Exit Enable/Disable

Pole Slip Counter 1 to 20 1

Pole Slip Reset 1 to 8160 Cycles 1 Cycle 1 Cycle or 1%

Frequency

Pickup #1,#2,#3,#4 50.00 to 67.00 Hz 0.01 Hz 0.02 Hz 40.00 to 57.00 Hz*

Time Delay #1–#4 2 to 65,500 Cycles 1 Cycle 2 Cycles or 1%

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.

59

59N

60FL

81

78


–7–



Rate of Change of Frequency

Pickup #1, #2 0.10 to 20.00 Hz/Sec. 0.01 Hz/Sec. 0.05 Hz/Sec. or 5%

Time Delay #1, #2 1 to 8160 Cycles 1 Cycle 20 Cycles

Negative Sequence Voltage Inhibit 0 to 99% 1% 0.5%

Phase Differential Current

Pickup 0.20 A to 3.00 A 0.01 A 0.1 A or 5%

(0.04 to 0.60 A) (0.02 A or 5%)

Percent Slope 1 to 100% 1% 2%

Time Delay* 1 to 8160 Cycles 1 Cycle 1 Cycle or 1%

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

Ground (zero sequence) Differential

Pickup 0.20 to 10.00 A 0.01 A 0.1 A or 5% (0.04 to 2.00 A) (0.02 A or 5%)

Time Delay 1 to 8160 Cycles* 1 Cycle +1 to ‑2 Cycles or 1%

CT Ratio Correction (RC) 0.10 to 7.99 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 operates as a directional differential. If 3I0 or In is extremely small (less than 0.2 secondary Amps), the directional element is disabled.

External Functions

Two functions are provided for externally connected devices to trip through the relay to provide additional logic and target information. Any one or more of the input contacts (IN1–IN6) can be programmed to activate designated output contacts after a selected time delay.


Nominal Settings

Nominal Voltage 50 to 140 V 1 V —

Nominal Current 0.50 to 6.00 A 0.01 A —

VT Configuration Line‑Line/Line‑Ground/ Line‑Ground to Line‑Line*

Seal‑In Delay 2 to 8160 Cycles 1 Cycle 1 Cycle or 1%

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

81R

87

87GD

EXT


–8–


OPTIONAL PROTECTIVE FUNCTIONSDevice Setpoint Number Function Ranges Increment Accuracy†

Inverse Time Positive Sequence Overcurrent (I2t=K), for Stator Thermal Protection

Pickup 0.50 to 15.00 A 0.01 A 0.1 A (0.10 to 3.00 A) (0.02 A)

Time Delay @6X* 0.10 to 10.00 Sec 0.01 Sec 3% or 3 Cycles

Reset Characteristics 4 minutes — 3% (Linear) (from threshold of trip)

* This time delay setting is at six times the pickup current.

Field Ground Protection

Pickup #1, #2 5 to 100 KΩ 1 KΩ 10% or ±1KΩ

Time Delay #1, #2 1 to 8160 Cycles 1 Cycle ( 2IF +1) Sec.

Injection Frequency (IF) 0.10 to 1.00 Hz 0.01 Hz

Brush Lift‑Off Detection (measuring control circuit)

Pickup 0 to 5000 mV 1 mV

Time Delay 1 to 8160 Cycles 1 Cycle ( 2IF +1) Sec.

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

Figure 7, Typical Field Ground Connection Diagram, illustrates a typical connection utilizing the M‑3921 Field Ground Coupler. Hardware dimensional and mounting information is shown in Figure 8, M‑3921 Field Ground Cou‑pler Mounting Dimensions.

64F

64B

51T


–9–


DescriptionThe M‑3425 Generator Protection Relay is suitable for all generator ratings and prime movers. Typical con‑nection diagrams are illustrated in Figure 2, M‑3425 Typical One‑Line Connection Diagram, Figure 3, M‑3425 Typical One‑Line Connection Diagram (Configured for Split‑Phase Differential), and Figure 4, M‑3425 Typical Three‑Line Connection Diagram.

Configuration OptionsThe M‑3425 Generator Protection Relay is available with Standard Protective Functions, Optional Protective Functions, and Optional Features. This provides the user flexibility in selecting a protective system to best suit the application. The relay may be purchased as a Protection System which includes all Standard Protective Functions. Additional Optional Protective Functions may be added at the time of purchase at per‑function pricing.

The relay may also be purchased as a Base System, with the user selecting any ten (10) Standard Protective Functions. Additional Standard Functions and/or Premium Protective Functions may be added at the time of purchase at per‑function pricing.

The user can select the Human‑Machine Interface (HMI) Module, Target Module, or redundant power supply at time of purchase for either the Protective System or Base System options.

When the user purchases the Field Ground (64F) Premium Protective Function, an external coupler module (M‑3921) is provided for isolation from the dc field voltages.

MeteringThe relay provides metering of voltages (phase, neutral and sequence quantities), currents (phase, neutral and sequence quantities), real power, reactive power, power factor and impedance measurements.

Metering accuracies are:

Voltage: 0.5 V or 0.5%, whichever is greater 0.8 V or 0.75%, whichever is greater (when both RMS and Line‑Ground to Line‑Line are selected)

Current: 5 A rating, 0.1 A or 3%, whichever is greater 1 A rating, 0.02 A or 3%, whichever is greater

Power: 0.01 PU or 2%, whichever is greater

Frequency: 0.02 Hz (from 57 to 63 Hz for 60 Hz models; from 47 to 53 Hz for 50 Hz models)

Oscillographic RecorderThe oscillographic recorder provides comprehensive data recording of all monitored waveforms, storing up to 170 cycles of data. The total record length is user‑configurable for 1, 2, 3 or 4 partitions. The sampling rate is 16 times the power system nominal frequency (50 or 60 Hz). The recorder may be triggered either via the desig‑nated status inputs, trip outputs, or via serial communications. The recorder continuously stores waveform data, keeping the most recent data in memory. When triggered, the recorder stores pre‑trigger data, then continues to store data in memory for a user‑defined, post‑trigger delay period.

The records may be analyzed or viewed using Beckwith Electric M‑3801D IPSplot® PLUS Oscillograph Analysis software or M‑3813 ComVert software, which converts Beckwith Electric oscillographic files to COMTRADE format.

Target StorageA total of 24 targets can be stored. The information will include the function(s) operated, the functions picked up, input/output status, time stamp, and phase and neutral currents at the time of trip.

CalculationsCurrent and Voltage RMS Values: Uses discrete Fourier transform algorithm on sampled voltage and current signals to extract fundamental frequency phasors for relay calculations. RMS phase voltages for the 59 and 27 functions (when total RMS is selected), and the 24 function are obtained using the time domain approach to obtain accuracy over a wide frequency band. When the RMS option is selected, the magnitude calculation is accurate over a wide frequency range (10 to 80 Hz). When the DFT option is selected, the magnitude calculation is accurate near nominal frequency (50 or 60 Hz).

–10–


Power Input OptionsNominal 110/120/230/240 V ac, 50/60 Hz, or nominal 110/125/220/250 V dc. UL/CSA rating 85 V ac to 265 V ac and from 80 V dc to 288 V dc. Burden 20 VA at 120 V ac/125 V dc. Withstands 300 V ac or 300 V dc for 1 second.

Nominal 24/48 V dc, operating range from 18 V dc to 56 V dc. Burden 20 VA at 24 V dc and 20 VA at 48 V dc. Withstands 65 V dc for 1 second.An optional redundant power supply is available.

Sensing InputsFour Voltage Inputs: Rated nominal voltage of 60 V ac to 140 V ac at 60 Hz or 50 Hz. Will withstand 240 V continuous voltage and 360 V for 10 seconds. Source voltages may be line‑to‑ground or line‑to‑line connected. Phase sequence ABC or ACB is selectable. Voltage transformer burden less than 0.2 VA at 120 V ac.

Seven Current Inputs: Rated nominal current (IR) of 5.0 A or 1.0 A at 60 Hz or 50 Hz. Will withstand 2IR continuous current and 100IR for 1 second. Current transformer burden is less than 0.5 VA at 5 A, or 0.3 VA at 1 A.

Control/Status InputsThe control/status inputs, INPUT1 through INPUT6, can be programmed to block any relay functions, to trigger the oscillographic recorder, or to operate one or more outputs. The control/status inputs should be dry contacts and are internally connected (wetted) to a 24 V dc power supply. To provide breaker status LED indication on the front panel, the INPUT1 control/status input must be connected to the 52b breaker status contact. The minimum current value to initiate/pickup an Input is >25 mA.

Output ContactsThe eight programmable output contacts (six form ‘a’ and two form ‘c’), the power supply alarm output contact (form ‘b’), and the self‑test alarm output contact (form ‘c’) are all rated per IEEE C37.90 (See Tests and Stan‑dards section for details).

Any of the functions can be individually programmed to activate any one or more of the eight programmable output contacts.

Target/Status Indicators and ControlsThe RELAY OK LED reveals proper cycling of the microcomputer. The BRKR CLOSED LED will turn on when the breaker is closed (when the 52b contact input is open). The OSC TRIG LED indicates that oscillographic data has been recorded in the unit's memory. The TARGET LED will turn on when any of the relay functions operate. Pressing and releasing the TARGET RESET button resets the target LED if the conditions causing the operation have been removed. Holding the TARGET RESET button displays the present pickup status of the relay functions. The PS1 and PS2 LEDs will remain on as long as power is applied to the unit and the power supply is operating properly.

CommunicationCommunications ports include rear panel RS‑232 and RS‑485 ports, a front panel RS‑232 port, and a rear‑panel IRIG‑B port. The communications protocol implements serial, byte‑oriented, asynchronous communication, providing the following functions when used with the Windows™‑compatible M‑3820C IPScom® Communications Software package. MODBUS and BECO 2200 protocols are supported providing:

• Interrogation and modification of setpoints

• Time‑stamped trip target information for the 24 most recent events

• Real‑time metering of all quantities measured

• Downloading of recorded oscillographic data

–11–


IRIG‑BThe M‑3425 Generator Protection Relay can accept either modulated or demodulated IRIG‑B time clock syn‑chronization signal. The IRIG‑B time synchronization information is used to correct the hour, minutes, seconds, and milliseconds information.

HMI Module (optional)Local access to the relay is provided through an optional M‑3931 HMI (Human‑Machine Interface) Module, allow‑ing for easy‑to‑use, menu‑driven access to all functions via six buttons and a 2‑line by 24 character alphanumeric LED. Features of the HMI Module include :

• User‑definable access codes allow three levels of security

• Interrogation and modification of setpoints

• Time‑stamped trip target information for the 24 most recent events

• Real‑time metering of all quantities measured

Target Module (optional)An optional M‑3925 Target Module provides 24 target and 8 output LEDs. Appropriate target LEDs will light when the corresponding function operates. The targets can be reset with the TARGET RESET pushbutton. The OUTPUT LEDs indicate the status of the programmable output relays.

Tests and StandardsThe relay complies with the following type tests and standards:

Voltage Withstand

Dielectric WithstandIEC 255‑5 3,500 V dc for 1 minute applied to each independent circuit to earth 3,500 V dc for 1 minute applied between each independent circuit 1,500 V dc for 1 minute applied to IRIG‑B circuit to earth 1,500 V dc for 1 minute applied between IRIG‑B to each independent circuit 1,500 V dc for 1 minute applied between RS‑485 to each independent circuit

Impulse VoltageIEC 255‑5 5,000 V pk, +/‑ polarity applied to each independent circuit to earth 5,000 V pk, +/‑ polarity applied between each independent circuit 1.2 by 50 µs, 500 ohms impedance, three surges at 1 every 5 seconds

Insulation ResistanceIEC 255‑5 > 40 Megaohms

Electrical Environment

Electrostatic Discharge TestIEC 1000‑4‑2 Class 4 (8 kV)—point contact discharge

Fast Transient Disturbance TestIEC 1000‑4‑4 Class 4 (4 kV, 2.5 kHz)

–12–


Surge Withstand CapabilityANSI/IEEE 2,500 V pk‑pk oscillatory applied to each independent circuit to earthC37.90.1 2,500 V pk‑pk applied between each independent circuit 5,000 V pk Fast Transient applied to each independent circuit to earth 5,000 V pk Fast Transient applied between each independent circuit

Radiated SusceptibilityANSI/IEEE 25‑1000 Mhz @ 35 V/m (with 64F option, 20 V/m)C37.90.2

Output Contacts RatingsIEEE C37.90 30 A make for 0.2 seconds at 250 Vdc resistiveUL 508 8 A carry at 120 Vac, 50/60 HzCSA C22.2 No. 14 6 A break at 120 Vac, 50/60 Hz 0.1 A break at 125 Vdc 0.1 A break at 120 Vac

Atmospheric Environment

TemperatureIEC 68‑2‑1 Cold, –20° C for 96 hoursIEC 68‑2‑2 Dry Heat, +70° C for 96 hoursIEC 68‑2‑3 Damp Heat, +40° C @ 93% RH, for 96 hours

Mechanical Environment

VibrationIEC 255‑21‑1 Vibration response Class 1, 0.5 g Vibration endurance Class 1, 1.0 g

Compliance UL‑Listed per 508 – Industrial Control Equipment

CSA‑Certified per C22.2 No. 14‑95 – Industrial Control Equipment

PhysicalSize: 19.00" wide x 5.21" high x 10.20" deep (48.3 cm x 13.2 cm x 25.9 cm)

Mounting: The unit is a standard 19", semiflush, three‑unit high, rack‑mount panel design, conforming to ANSI/EIA RS‑310C and DIN 41494 Part 5 specifications. Vertical or horizontal panel‑mount options are available.

Approximate Weight: 17 lbs (7.7 kg)

Approximate Shipping Weight: 25 lbs (11.3 kg)

Recommended Storage Parameters

Temperature: 5° C to 40° C

Humidity: Maximum relative humidity 80% for temperatures up to 31° C, decreasing to 31° C lin‑early to 50% relative humidity at 40° C.

Environment: Storage area to be free of dust, corrosive gases, flammable materials, dew, percolating water, rain and solar radiation.

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

–13–


Patent & WarrantyThe M‑3425 Generator Protection Relay is covered by U.S. Patents 5,592,393 and 5,224,011.

The M‑3425 Generator Protection Relay is covered by a five year warranty from date of shipment.

External ConnectionsM‑3425 external connection points are illustrated in Figure 1, External Connections, on the facing page.

–14–


s CAUTION: Application of external voltages to the IN‑PUTS terminals may result in damage to the unit.

NOTES:

1. All relays are shown in the de‑energized state.

2. Output contacts #1 through #4 are high speed operation contacts.

3. The power supply relay (P/S) is energized when the power supply is OK.

4. The self‑test relay is energized when the relay has performed all self‑tests successfully.

To fulfill requirements for UL and CSA listing, terminal block connections must be made with No. 22–12 AWG solid or stranded copper wire inserted in an AMP #324915 (or equivalent) connector and wire insulation used must be rated at 75° C minimum.

Torque Requirements:

• Terminals 1–34: 12.0 in‑lbs

• Terminals 35–63: 8.0 in‑lbs, minimum, and 9.0 in‑lbs, maximum.

s CAUTION: Over torquing may result in terminal damage.

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910

61

90

11

8t

hA

VE

NO

.

F2

F4

F3

F1

-

Dan

ger!

Con

tact

ave

c le

s te

rmin

aux

peut

cau

ser u

n ch

oc e

lect

rique

Figure 1 External Connections

–15–


50DT

Utility System

52Unit

52Gen

50BFPh

87

5050/2740 51T 4651V60FL 21 78 32

27

81R 81 27 59 24

64F 64B

M-3921+

-

CT

VT

CT

M-3425

87GD 50N50

BFN 51N

R

CT

VT

59N27TN

27

32

R

M-3425 M-3425

High‑impedance Grounding with ThirdHarmonic 100% Ground Fault Protection

Low‑impedance Grounding withOvercurrent Stator Ground Fault Protection

This function is available as astandard protective function.

This function is available as aoptional protective function.

This function provides control forthe function to which it points.

NOTE: Some functions aremutually exclusive; seeInstruction Book for details.

M-3425 TypicalConnection Diagram

Figure 2 One‑Line Connection Diagram

–16–


50DT

Utility System

52Unit

52Gen

5050/2740 51T 4651V60FL 21 78 32

27

81R 81 27 59 24

64F 64B

M-3921+

-

CT

VT

CT

M-3425

50N 51N

R

CT

VT

59N27TN

27

32

R

M-3425 M-3425

High‑impedance Grounding with ThirdHarmonic 100% Ground Fault Protection

Low‑impedance Grounding withOvercurrent Stator Ground Fault Protection

This function is available as astandard protective function.

This function is available as aoptional protective function.

This function provides control forthe function to which it points.

NOTE: Some functions aremutually exclusive; seeInstruction Book for details.

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

Figure 3 Typical One‑Line Connection Diagram (configured for split‑phase differential)

–17–


Example of Control / Output Connections

+

‑61 11 10

60

16 15

52b 60FL

POWERSUPPLY

SELF‑TESTFAILUREALARM

+

‑

DC: 24 V 48 V

EXTERNAL INPUTS ALARM OUTPUTS CONTROLOUTPUTS

TRIPALARM

12 13

POWEROK

STATUSALARM

VT FUSE LOSS

TRIP

52G

TRIP OUTPUT

OSCILLOGRAPHRECORDERINITIATE

BREAKERFAILUREINITIATE

M-3425

ORDC: 110 V 125 V 220 V 250 VAC: 110 V 120 V 230 V 240 V

62

63

UTILITY SYSTEM

ABC

48 49

46 47

OtherRelays M-3425

50 51

Generator

OtherRelays

52Gen

A B C

Three VT Wye-WyeConnection

40

41

38

39

42

43

M-3

425

OR

OR

45

44

High Impedance Grounding

M-3425

58 59

56 57

54 55

M-3425

57 56

55 54

M-3425

59 58

57 56

55 54

M-3425

59 58

OR OR

M-34255352

A B C

A B C A B CA B C

M‑3921Field Ground

CouplerModule

10

1152b

M-3425

OR

Low Impedance Grounding

M-3

42542

43

40

41

38

39

Two VT Open-DeltaConnection

A B C

40

41

38

39

42

43

M-3

425

Three VT Wye-WyeConnection - Alternate

A B C

Figure 4 M‑3425 Typical Three‑Line Connection Diagram

NOTE: M‑3425 current terminal polarity marks (•) indicate "entering" current direction when primary current is "from" the generator. If CT connections differ from those shown, adjust input terminals.

NOTE: Wire to split phase differential CTs for use with 50DT split phase function.

–18–


Figure 5 Horizontal Mounting Dimensions

NOTE: Panels for vertical mounting are available. When mounted vertically, the target module will be located at the top and all front‑panel text will be horizontally aligned. Consult Beckwith Electric Co. for details.

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]

18.31[46.51]

0.35[0.89]

1.48[3.76]

2.25[5.72]

17.68[44.91]

RECOMMENDED CUTOUT WHEN RELAY ISNOT USED AS STANDARD RACK MOUNT

5.28[13.41]

NOTE: Dimensions in brackets are in centimeters.

–19–


Figure 6 Vertical Mounting Dimensions

1.97[5.0]

19.00[48.26]

18.30[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.

6.19[15.7]

–20–


M‑3921 Field Ground Coupler NOTES: 1. The above circuit measures insulation resistance (Rf) between rotor field winding and ground (64F).

2. Relay injects 15 V squarewave (Vout) and measures return signal (Vf) to calculate Rf.

3. The injection frequency can be set (0.1 to 1.0 Hz) based on the rotor capacitance, in order to improve accuracy.

4. Analyzing signal rise time can determine if shaft brushes are open (64B).

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

• 60 to 1200 V dc, continuous

• 1500 V dc, 1 minute

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

Patent & WarrantyThe M‑3921 Field Ground Coupler is covered by a five year warranty from date of shipment.

Tests and StandardsM‑3921 Field Ground Coupler complies with the following tests and standards:

Voltage Withstand

Isolation4 kV ac for 1 minute, all terminals to case

Impulse VoltageIEC 255–5, 5,000 V pk, 1.2 by 50 ms, 0.5 J, 3 positive and 3 negative impulses at 5 second part 5 intervals per minute

–21–


Electrical Interference

Electrostatic Discharge TestIEC 1000‑4‑2 Class 4 (8 kV)—point contact discharge

Fast Transient Disturbance TestsIEC 1000‑4‑4 Class 4 (4 kV, 2.5 kHz)

Surge Withstand CapabilityANSI/IEEE 2,500 V pk‑pk oscillatory applied to each independent circuit to earthC37.90.1 2,500 V pk‑pk applied between each independent circuit 5,000 V pk Fast Transient applied to each independent circuit to earth 5,000 V pk Fast Transient applied between each independent circuit

Radiated SusceptibilityANSI/IEEE 25‑1000 Mhz @ 20 V/mC37.90.2

Atmospheric EnvironmentIEC 68–2–1 Cold, –20° C for 96 hoursIEC 68–2–2 Dry Heat, +70° C for 96 hoursIEC 68–2–3 Damp Heat, +40° C @ 93% RH, for 96 hours

Enclosure ProtectionNEMA 1, IEC IPC‑65

–22–


PR

OT

EC

TIO

N R

ELA

YM

-3425

PR

OC

ES

SO

R

Field G

roundD

etection

Squarew

aveG

enerator

Signal

Measurem

entand P

rocessingR

f.Cf

CO

UP

LING

NE

TW

OR

K(M

-3921)

Ground/M

achine Fram

e

Shaft

Ground

Brush

SU

PP

LYV

OLT

AG

E

Gen.

Rotor

3735

36

TB

5

Rear T

erminal

Block P

in No.

Shield

Cable

TB

4

TB

1T

B1

Vf

Vout

Brushes

TB

3

TB

2

Figure 7 Typical Field Ground Connection Diagram

–23–


.18

DIA

[0.4

6] 4

HO

LES

MO

UN

TIN

G P

AT

TE

RN

WIT

HO

UT

TA

BS

Fie

ld G

roun

dC

oupl

er4.

72 [1

1.99

]

7.87

[19.

99]

2.96

RE

F [7

.52]

3.54

[9.0

]

N

OT

E: D

imen

sion

s in

bra

cket

s ar

e in

cen

timet

ers.

7.40

[18.

79]

9.06

[23.

01]

3.54

[9.0

]

.18

DIA

[0.4

6] 4

X

M-3

921

Figure 8 M‑3921 Field Ground Coupler Mounting Dimensions

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