某海上风电场35 kV集电线跳闸故障的处理

Handling of 35 kV Collector Line Tripping in a Certain Offshore Wind Farm

通过对某海上风电场35 kV集电线跳闸进行检查分析,确定集电线断路器跳闸的原因是集电线上连接的3#风机海缆终端头被击穿,造成单相接地故障。3#风机海缆终端头更换后送电时3#风机断路器跳闸,检查发现3#风机断路器TA二次接线端子松动,引起自产零序电流过流,造成零序保护误动,使断路器跳闸。

This article analyzes and inspects the tripping of the 35 kV collector line of a certain offshore wind farm,and determines that the cause of the circuit breaker tripping of the collector line is the breakdown of the submarine cable terminal of the 3#wind turbine connected to the collector line,causing a single-phase grounding fault.After replacing the submarine cable terminal of the 3#wind turbine,the circuit breaker of the 3#wind turbine tripped during power transmission.Upon inspection,it was found that the CT secondary wiring terminal of the 3#wind turbine circuit breaker was loose,causing the self-produced zero sequence current to overcurrent,resulting in misoperation of the zero sequence protection and causing the circuit breaker to trip.