RRaghunath
Electrical
- Aug 19, 2002
- 1,731
This is about emergency standby generator in a power plant. The generator typically is rated 1000kVA or below and at 415V.
The generator is on standby duty as mentioned already and is started / synchronised with the 415V normal power supplies to load and confirm the healthiness / readiness periodically.
Normally, reverse power protection is provided for such a generator apart from other protections. But, I have come across in a plant recently the generator is provided with reverse reactive power protection.
1. Is the practice followed anywhere else? I think it may be relevant only for induction generators sites and that too with the relay set to look away from generator.
2. The relay is set 3% (fixed) and time delay of 5sec and looking towards generator. The plant engineers report that the relay maloperates when ever large reactive power is drawn from the generator suddenly. Any suggestions?
Thanks in anticipation.
The generator is on standby duty as mentioned already and is started / synchronised with the 415V normal power supplies to load and confirm the healthiness / readiness periodically.
Normally, reverse power protection is provided for such a generator apart from other protections. But, I have come across in a plant recently the generator is provided with reverse reactive power protection.
1. Is the practice followed anywhere else? I think it may be relevant only for induction generators sites and that too with the relay set to look away from generator.
2. The relay is set 3% (fixed) and time delay of 5sec and looking towards generator. The plant engineers report that the relay maloperates when ever large reactive power is drawn from the generator suddenly. Any suggestions?
Thanks in anticipation.