引用本文: | 杨建辉,杨建勇.一起一次接线原因导致的主变差动保护动作分析[J].电力系统保护与控制,2008,36(1):87-89.[点击复制] |
YANG Jian-hui,YANG Jian-yong.An analysis of malfunction on the differential protection of main transformer caused by inappropriate main electric connection[J].Power System Protection and Control,2008,36(1):87-89[点击复制] |
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摘要: |
在中性点非直接接地系统中发生单相接地时,因接地电流很小,一般不会导致电流保护动作。但在某变电站中因一次接线原因在发生单相接地时,导致了主变差动保护动作,在分析动作原因的基础上,对此种接线方式可能引起的危害进行了初步分析,提出了解决方法。 |
关键词: 中性点不接地系统 单相接地 差动保护 |
DOI:10.7667/j.issn.1674-3415.2008.01.020 |
投稿时间:2007-05-17修订日期:2007-08-31 |
基金项目: |
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An analysis of malfunction on the differential protection of main transformer caused by inappropriate main electric connection |
YANG Jian-hui1,YANG Jian-yong2 |
(1. Wujiang Electric Power Company Limited, Qianjiang 409000,China;2.Wanzhou Power Supply Bureau, Wanzhou 404100,China) |
Abstract: |
When single-phase-to-earth fault occurs in non-direct-grounding neutral system, the current relay generally will not operate since the amplitude of grounding current is too small. But when such fault occurred in a station discussed in this paper, the differential protection of main transformer operated because of its inappropriate main electric connection. Based on the malfunction analysis, the harm brought by such main electric connection is discussed primarily and a solution is proposed. |
Key words: non-direct-grounding neutral system single-phase-to-earth fault differential protection |