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某平台发生下级变压器空载合闸引起发电机纵联差动保护误动作事件,直接原因是下级变压器额定容量与发电机额定容量较为接近,变压器空载合闸相对较大,电流互感器暂态特性有一定差异。通过对误动作事件的分析,找出误动发生的原因,给出在发电机纵联差动保护中加入二次谐波闭锁的解决措施,通过调试和长期运行验证了解决措施的可行性,为今后的海油平台电力系统设计和运行提供参考。
A platform subordinate transformer no-load closing caused by generator longitudinal differential protection malfunction, the direct reason is that the lower transformer rated capacity and generator rated capacity is relatively close, the transformer no-load closing is relatively large, the current transformer transient There are some differences in characteristics. Through the analysis of misoperation events, find out the reasons for the misoperation, given the solution of adding second harmonic blockade in the longitudinal differential protection of generator, and verify the feasibility of the solution through debugging and long-term operation, It provides a reference for the design and operation of the offshore power system in the future.