Abstract
The accident fan is the first-stage wind farm unit. From 2011 to 2019, the transformation of low-voltage crossing, lightning protection, grid switch, engine room grid cabinet and frequency converter cabinet are gradually carried out, and the original main control system is updated. One day in 2019, a fire accident happened to the generator, most of the engine room covers were burnt, the top section of the tower tube had traces of oil overflow after combustion, and a large area of combustion damaged parts scattered around the tower base. The cause of the accident is that the two phases of the stator contactor are not completely disconnected when the network is disconnected, and the main circuit breaker of the tower base is not tripped when the stator contactor is in fault, and the fault current is not cut off in time, which is a design defect.
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