Coordination with Utility and generator
Coordination with Utility and generator
(OP)
I am doing a design for a compressor station. After I did calculaton, I found out the short circuit level when it is connected to utility side is much higher than the short circuit level when it is connected to the on site generator side.The main CB on SWGR is controled by SR750 Relay. I am not sure how to setup the OC. Which S-C I should base on? My understanding is, we should protect the system based on normal running scenaio.We should allow the system running under emergency state without proyection.I know there is another way of solving the problem in SR750. That is, to set up two setting groups by control fuction of Realy which are controled by the aux contacts from the breakers of both sides respectively.I argued with my superviser about this. He insited on protecting Geneartor side so that the utility side can be protected as well. The problem is, the settings are too low, causing unecessry trippings sometimes.






RE: Coordination with Utility and generator
RE: Coordination with Utility and generator
Current limiting reactor may be an option to balance the SC level when operated connected to the utility and disconnected otherwise.
RE: Coordination with Utility and generator
RE: Coordination with Utility and generator
Changing setting groups works, but I advise investigating how long the relay is out of service during a setting group change.
RE: Coordination with Utility and generator
RE: Coordination with Utility and generator
RE: Coordination with Utility and generator
Thank you for these valuable inputs.
RE: Coordination with Utility and generator
RE: Coordination with Utility and generator