Z型接地变外接零序CT的选择
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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.
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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[2]贺家李,宋从矩.电力系统继电保护原理[M].北京:中国电力出版社,2004.
[3]DL/T 584-2007 3kV~110kV电网继电保护装置运行整定规程[S].
[4]GB/T 32900-2016并网光伏电站继电保护技术规范[S].
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[6]韩挺,胡德飞.Znyn曲折接线接地变压器的原理及试验方法[J].水利电力机械,2004,26(6):37-40.
[7]DL/T 620-1997交流电气装置的过电压保护和绝缘配合[S].
[8]GB/T 1094.6-2011电力变压器第6部分:电抗器[S].
[2]贺家李,宋从矩.电力系统继电保护原理[M].北京:中国电力出版社,2004.
[3]DL/T 584-2007 3kV~110kV电网继电保护装置运行整定规程[S].
[4]GB/T 32900-2016并网光伏电站继电保护技术规范[S].
[5]载靖波.浅析中性点经小电阻接地电网中Z形接地变压器[J].变压器,2005,42(2):18-21.
[6]韩挺,胡德飞.Znyn曲折接线接地变压器的原理及试验方法[J].水利电力机械,2004,26(6):37-40.
[7]DL/T 620-1997交流电气装置的过电压保护和绝缘配合[S].
[8]GB/T 1094.6-2011电力变压器第6部分:电抗器[S].