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Hi everyone!!
Here in a process plant we have been dealing with a severe problem. A 315kW, 6.6kV fed compressor motor is very frequently Tripping on Earth Fault while starting by 7SJ600 O/C relay. We have checked everything we could do. We have changed CT's, relay everything. The settings are same for another same rating motor which is running continuously without any problem. Both of its settings match to every protection including dynamic settings.
If any one could come up with any suggestion Please!!!
Here in a process plant we have been dealing with a severe problem. A 315kW, 6.6kV fed compressor motor is very frequently Tripping on Earth Fault while starting by 7SJ600 O/C relay. We have checked everything we could do. We have changed CT's, relay everything. The settings are same for another same rating motor which is running continuously without any problem. Both of its settings match to every protection including dynamic settings.
If any one could come up with any suggestion Please!!!