110 kV全绝缘变压器中性点过电压保护
黄燕飞,齐茜茜,夏子路,付薇
(中国石油集团工程设计有限责任公司华北分公司,河北 任丘 062552)
摘 要:介绍了110 kV 系统接地运行和全绝缘变压器的使用情况,分析了110 kV 变压器中性点的过电压水平,通过研究相关规范资料,结合以往设计经验,对110 kV 全绝缘变压器中性点的过电压保护提出解决办法,其中性点采用二次继电保护和避雷器作为过电压保护措施,避雷器的参数选择,应根据其过电压水平确定。
关键词:全绝缘变压器;不接地运行;中性点;过电压保护;避雷器
中图分类号:TM63;TM415 文献标识码:B 文章编号:1007-3175(2015)11-0036-02
Neutral Point Overvoltage Protection of 11 0 kV All-Insulating Transformer
HUANG Yan-fei, QI Qian-qian, XIA Zi-lu, FU Wei
(North China Branch of China Petroleum Engineering Design Co., Ltd, Renqiu 062552, China)
Abstract: Introduction was made to the 11 0 kV system grounding operation and the service condition of all-insulating transformers. This paper analyzed the overvoltage level of 11 0 kV transformer neutral point. By researching the relevant standard information and combining formerly design experience, this paper proposed the solution to solve the problem of 11 0 kV transformer neutral point overvoltage protection.The neutral point took the secondary relaying protection and arrester as overvoltage protection measures and the arrester parameters selection should be determined by the overvoltage level.
Key words: all-insulating transformer; earth-free operation; neutral point; overvoltage protection; arrester
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