Analysis on Action Behavior of Protective Relay against an Actual Cable Failure and Countermeasures
This paper analyzes the action behavior of protective relay after an actual event of internal 10 kV electrical cable joint failure in a hydropower plant. It reports methods of observing the problems such as sampling errors of grounding ze-ro-sequence current of protective relays,protective action dead zone,etc. It also proposes effective countermeasures inclu-ding adjusting cable zero-sequence CT installation position,optimizing installation position of 10 kV bus incoming circuit breaker,and adding live display devices.
cable failureprotective actionaction dead zoneinstrument transformercircuit breaker
万方数据
维普
