电网电容电流外加信号单频测量法的研究与应用  

Research and application of power grid capacitance current plus signal single-rate measuring method

作　　者：王志金[1] 王宗信[1] 

机构地区：[1]河北工程大学基建处,河北邯郸056038

出　　处：《机电工程》2012年第1期97-99,共3页Journal of Mechanical & Electrical Engineering

摘　　要：针对高压电力系统发生单相接地时,流经故障点的电流急剧增加,产生很强的间隙弧光接地过电压问题,对电网电容电流外加信号测量控制器的方法进行了详细的分析,充分论证了测量电网电容电流的必要性,对电网电容电流外加信号单频测量控制器的方法进行了研究,将外加信号单频测量法的原理计算分析与其他测量方法进行了比较。研究结果表明,电容电流外加信号单频测量法具有测量准确,特别是电网系统阻尼大,回路Q值低或位移电压很小时,更能显示外加信号单频测量法的优势,为进一步进行优化电网电容电流测量法的设计与应用奠定了基础。When high-voltage power system grounded for single-phase ,the current flowing through the point of failure increases dramatically, this resulted in a very strong ground over-voltage arc gap. In order to solve this problem,the method of capacitive current plus signal power measurement was analyzed in detailed, the necessity of measurement of the power capacitor current was fully demonstrated and the additional signal power single-frequency capacitive current method of measuring the controller was reserved, the plus single-frequency signal measurement with the other methods of measure was compared. The results show that the capacitive current plus single-frequency signal measurement is more accurate, especially when the large power system damping, or the displacement of low-Q circuit voltage is very small, sing/e-frequen- cy signal is applied to show the advantages of measurement better,laying the foundation for the design and application of the grid capacitive current measurement.

关 键 词：电网 电容电流 外加信号 单频测量 

分 类 号：TM712[电气工程—电力系统及自动化]