8-8 G30 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUALSETTINGS CHAPTER 8: APPLICATION OF SETTINGS88.2.4 Generator unbalanceStage 1 of the generator unbalance element is typically used to trip the generator. In this example, the I2 capability of themachine is 8% and the I 22 T capability is 10. The generator nominal current is:Eq. 8-5The minimum operate time of stage 1 is to be set to 0.25 seconds, the maximum operating time is to be 10 minutes, andthe 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 normallycleared by system protection. For the application example, the pickup setting is:Eq. 8-6Source 2 is to be chosen for this element. The settings are as follows.
