外加信号法测量配电网电容电流  

Method of capacitance current measuring

作　　者：董涛[1] 夏小飞[1] 刘铁[1] 鲁铁成[1] 

机构地区：[1]武汉大学电气工程学院,湖北武汉430072

出　　处：《电力自动化设备》2005年第11期38-40,共3页Electric Power Automation Equipment

摘　　要：介绍一种从电压互感器(TV)二次侧测量电容电流的方法。在TV开口三角端注入频率不同但幅值相同的恒定电压,测得TV开口端对地电容电流i0,求出电网电容的电流值。对注入电压频率的选取直接影响到测量的准确度,选取的频率为45Hz,48Hz,52Hz。采用10kV现场用TV,用不同集中电容代替线路对地电容,从TV开口三角形侧注入幅值以及频率不等的电压进行模拟实验,从实测数据的计算结果说明,该测量方法是可行的。A method to measure the capacitance current at the secondary winding of PT is introduced. Constant voltages with same amplitude but different frequencies are injected into the open-delta of PT to get its grounding capacitance current i0 and then to calculate the capacitance current of network. The selected frequencies of injected voltage influence the measurement accuracy,which are 45Hz, 48 Hz and 52 Hz in this paper. A simulative test is carried out with a field 10kV PT,vohages of different amplitudes and frequencies are injected into the open-delta of PT with different concentrated capacitances instead of grounding Capacitance. The ealeulative results from measured data show its feasibility.

关 键 词：频率 电磁式电压互感器 电容电流测量 

分 类 号：TM835.2[电气工程—高电压与绝缘技术]