Sepam™ Generator Applications
Sepam Generator Applications
 G87/G88 |
Advanced generator protection is covered with the Sepam G87/G88 and covers current, voltage, frequency, differential, and synchro check protection functions.
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 |
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 |
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 |
● |