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Protection and Control
Current differential protection (87S)
The switchover of 3-terminal and 2-terminal current differential protection can be automatically implemented according to the open/close state of feeder disconnector.
Two stage feeder end fault protection (50FLE)
This protection is only valid when the feeder disconnector is opened. It is used to clear the faults between CT and the opened disconnector. It will send a transfer trip command to remote end and keep the local breakers in service.
Sum overcurrent protection (50P)
Phase overcurrent protection is based on the summed current of two CTs. It can be used as the energizing protection or feeder backup protection.
Current drift auto adjustment
The relay continually and automatically traces the voltage and current drifts and adjusts the zero point to acquire accurate measurements.
