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.
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