SE Digest 178

MiCOM Protection Relays

MiCOM Generator Applications

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MiCOM Generator Applications

The Easergy™ MiCOM P34x generator protection relays provide flexible and reliable integration of protection, control, monitoring and measurement functions for small, medium and large generators.

Models available: • MiCOMP342 • MiCOMP343 • MiCOMP344 • MiCOMP345

P34x range covers small generators with all necessary industry standard protection and increasing through larger or more important generators with 100% stator ground fault protection via a 3rd harmonic measuring technique, pole slipping and unintentional energization at standstill protection. Advanced models in the range offer leading techniques for large generators including second neutral voltage inputs for ground fault/inter-turn protection and 100% stator ground fault protection via a low frequency injection technique.

P342 / P343 / P344 / P345

Table 5.38: Functions available for the different models of the Generator protection MiCOM range of relays ANSI Protection Function P342 P343

P344

P345

21 24 25

Under-impedance

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Overexcitation

Check synchronizing

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27TN/59TN

100% stator ground fault (3rd)

32L/O/R 37N/37P

Directional power

Sensitive phase and ground fault undercurrent

38/49

Thermal overload

40

Loss of field

460C

Negative sequence overcurrent Negative sequence thermal Negative sequence over voltage

46T

47

49T

Thermal overload

50/27

Unintentional energization Phase overcurrent Circuit breaker failure Interturn / split phase Voltage dependent O/C Under / over voltage Residual over voltage Restricted ground fault Wattmetric ground fault Ground fault

50/51P 50BF 50N/51N

50DT

51V

59/27

59N

64 5 PROTECTION, CONTROL, AND ENERGYAUTOMATION 64N/32N 64R 64S 67N 67P 67W

Rotor ground fault (MiCOM P391 option) 100% stator ground fault (low frequency)

Sensitive directional ground fault

Phase directional

Wattmetric sensitive ground fault

78

Pole slipping

81AB

Turbine abnormal frequency

81

Under / over frequency Generator differential

87G/87GT

CTS TCS VTS

Current transformer supervision

Trip circuit supervision

Voltage transformer supervision

Circuit breaker monitoring

Table 5.39: Typical Catalog Numbers Catalog Number

Description

Series 40 - Generator Protection, P342 (48-110Vdc), 1/5A CT inputs, 8In/7Out (user configurable voltage thresholds), 10 RTD's, 3xRJ-45, IEC61850, DNP3 Series 40 - Generator Protection, P342 (48-110Vdc), 1/5A CT inputs, 16In/14Out (user configurable voltage thresholds), 10 RTD's, 3xRJ-45, IEC61850, DNP3 Series 40 - Generator Protection, P345 (48-110Vdc), 1/5A CT inputs, 24In/24Out (user configurable voltage thresholds), 10 RTD's, 3xRJ-45, IEC61850, DNP3

Basic

P34221RBBM0B38L

Standard

P34321RBBM0B38M

Advanced

P34521RBBM0B38M

5-22

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11/20/2019