Generator Unbalance - GE G30 Instruction Manual

SETTINGS

8.2.4 Generator unbalance

Stage 1 of the generator unbalance element is typically used to trip the generator. In this example, the I
machine is 8% and the I
The minimum operate time of stage 1 is to be set to 0.25 seconds, the maximum operating time is to be 10 minutes, and
the reset time is to be set to 4 minutes.
Stage 2 is typically set lower than stage 1 with a time delay to prevent nuisance alarms for external faults that are normally
cleared by system protection. For the application example, the pickup setting is:
Source 2 is to be chosen for this element. The settings are as follows.
8
8-8
2
T capability is 10. The generator nominal current is:
2
CHAPTER 8: APPLICATION OF SETTINGS
G30 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
capability of the
2
Eq. 8-5
Eq. 8-6