摘要
在6-66kV中压供电系统中,单相接地故障约占配电网故障的70%以上,由于单相接地时故障点电流很小,尤其是中性点经消弧线圈接地的配电网中故障选线很困难,因此,单相接地故障选线是一个复杂而又艰巨的现实难题。传统的单一选线方案很难正确选线,而采用暂态首半波选线方案和7次谐波选线方案相结合的综合选线方案,巧妙利用了故障的暂稳态特征量,减小了单一判据而导致的误判。本文从7次谐波不受消弧线圈的影响,采用暂稳态结合的首半波和7次谐波综合选线方案进行分析,以解决小电流接地系统故障选线困难的问题。
In the 6 - 66kV medium voltage power supply system, single phase grounding fault for more than 70% of distribution network fault, due to single phase grounding fault current is very small, especially fault line selection is very difficult that for neutral grounding via arc suppression coil in distribution network, therefore, the single phase grounding fault line selection is a complex and difficult problem. The traditional single line selection scheme is very difficult to correctly select lines, but using the composite line selection scheme that combination of first half transient wave line selection scheme and the 7 harmonic line selection scheme, the clever use of fault transient characteristic quantity, reduces the misjudgment that because of the single criterion. This article from the 7 harmonic is not affected by an extinction coil, line selection have high reliability, use of transient combined first half wave, the 7 harmonic comprehensive fault line selection scheme, was analyzed to solve the small current grounding system fault line selection problem.
出处
《自动化与仪器仪表》
2013年第4期19-21,225,共3页
Automation & Instrumentation
基金
兰州石化职业技术学院科研基金项目(K06-07)
关键词
小电流接地系统
故障选线
7次谐波
消弧线圈
首半波
Small Current Grounding System
Fault Line Selection
the 7 Harmonic
Arc Suppression Coil
First Half Wave
