摘要
分析了Z型接地变高压侧发生接地故障时接地变两处CT感受到的故障电流,探讨接地变零序电流保护外接零序CT类型的选择,以避免因外接零序CT选择错误而引发保护拒动情况。
In this paper,two CT fault currents of grounding transformer in the case of high voltage side grounding fault of Z type grounding transformer were analyzed.The problem of external zero-sequence CT used in the zero-sequence current protection of grounded transformer was discussed,so as to avoid the protection failure due to the wrong selection of external zero-sequence CT.
引文
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