偏置电容法测量中压电网电容电流的误差分析-电网技术.PDF

29 卷 14 期 电 网 技 术 Vol. 29 No. 14 2005 年7 月 Power System Technology Jul. 2005 文章编号：1000-3673 （2005 ）14-0054-05 中图分类号：TM930.1 文献标识码：A 学科代码：470 4017 偏置电容法测量中压电网电容电流的误差分析 连鸿波，杨以涵，谭伟璞，曲轶龙，齐 郑 （华北电力大学 电气工程学院，北京市 昌平区 102206） ANALYSIS ON MEASURING ERROR OF CAPACITANCE CURRENT IN MEDIUM-VOLTGAE POWER NETWORK BY BIASED CAPACITANCE METHOD LIAN Hong-bo ，YANG Yi-han，TAN Wei-pu ，QU Yi-long，QI Zheng （School of Electrical Engineering，North China Electric Power University， Changping District，Beijing 102206 ，China ） ABSTRACT ：The system capacitance current in medium 接地系统。当系统电容电流大于规程要求的限值 voltage (MV) power networks is a very important parameter, 时，要确保电网中出现的各种接地电弧能可靠熄 which is required in arc suppression coil installation, [1] 灭，须安装消弧线圈以补偿接地电容电流 。系统 ferromagnetic resonance research and analysis of the reason 的电容电流值也是分析中性点不接地系统发生铁 causing fuse-blown in the high voltage (HV) side of PT. Here, the principle of indirect measurement of capacitance current in 磁谐振以及电压互感器（PT ）高压侧保险经常熔断 MV power network, i.e., biased capacitor method, is presented 原因的一个重要技术参数。对于中性点经电阻接地 and the reason of measuring error caused by biased capacitor 系统，要正确选择中性点电阻器的阻值，也需要知 method is analyzed in detail. The quantitative expression for the [2] 道电网单相接地时的电容电流值 。因此对于小电 relation between the relative error in m