Sepam™ Generator Applications

Sepam Generator Applications

G40

G87/G88

Generator protection is broken into two sections Standard and Advanced. The Standard protection is covered with the Sepam G40 protection relay and covers a host of current, voltage, and frequency protection elements. The Advanced protection is covered with the Sepam G87/G88 and covers current, voltage, frequency, differential, and synchro check protection functions.

Standard Protection Relay (G40 – Sepam 40 Series)

Typical Part Number: SQ1G40A1B1A0A0 Series 40 - Generator Protection G40 (24-250Vdc & 120-240Vac), 1/5A CT inputs, 10In/8Out (110-125 Vdc, 110Vac), RS485

Advanced Protection Relay (G87/G88 – Sepam 80 Series)

Typical Part Number: SQ1G87P1J5A0B0 Series 80 – Generator Protection G87 (24-250Vdc), mimicBus Graphical Display, 1/5A CT inputs, 14In/11Out Digital Module (110-125Vdc/mid p.u.), 2 x RJ-45 ports (Modbus or IEC61850 with GOOSE), ladder logic firmware (PLC base).

Features

Feature

G40

G87

G88

Current Protection

Built in CB Control

Native Zone Selective Interlocking

Waveform Captures

Event Records

Voltage Protection

Frequency Protection

Field Expandable Communications

Synchro-check Protection (optional)

 

Native Automatic Throw over Scheme

 

Field expandable I/O

 

Ladder Logic PLC custom programming (optional)

 

Mimic-bus graphical display (optional)

 

Onboard data logging

 

Native Load Shedding and Motor Restart

 

Ability to incorporate a transformer into the same zone of protection (M88 only)

 

Built in Motor start and trending reports

 

Communications options

Modbus RTU

DPN

Modbus TCP/IP

IEC61850–MMS

IEC61850–MMS + GOOSE

 

Functions

ANSI Device Number

Description

G40

G87

G88

12/14

Speed Switch

 

21B

Underimpedance

 

24

Volts/Hertz

 

25

Synch Check

 

27

Phase-to-phase undervoltage

27D

Positive sequence undervoltage

 

27R

Remnant Undervoltage

 

27S

Phase-to-neutral undervoltage

27TN

Third Harmonic Neutral Undervoltage

 

32P

Directional Power

32Q/40/55

Directional Reactive Power

38

Bearing Temperature

40

Loss of Excitation

46

Negative Sequence Current/Unbalance

47

Negative Sequence undervoltage

49

Thermal Overload

49T

RTD Monitoring

50/27

Inadvertent energization

 

50BF

Breaker Failure

50

Instantaneous Phase Overcurrent

50G

Instantaneous Ground Overcurrent(Measured)

50N

Instantaneous Ground Overcurrent(Calculated)

50V

Voltage Restrained Instantaneous  overcurrent

51

Time Phase Overcurrent

51G

Time Ground Overcurrent(Measured)

51N

Time Ground Overcurrent(Calculated)

51V

Voltage Restrained Time Overcurrent

59

Phase-to-phase overvoltage

59N

Neutral Voltage Displacement

66

Starts per hour

 

 

64G

100% Stator Ground Fault

 

67

Directional Phase Overcurrent

 

67N

Directional Ground Overcurrent

 

78

Pole Slip

 

81H

Overfrequency

81L

Underfrequency

87M

Machine Differential

 

 

87T

2 Winding Transformer Differential

   

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