500kV电容式电压互感器现场自激测试法分析  

Analysis on 500kV Capacitor Voltage Transformer Site Testing By Self-excitation Method

作　　者：岳永刚 尹建波 王亚平 

机构地区：[1]内蒙古超高压供电局,内蒙古自治区呼和浩特010080

出　　处：《电力电容器与无功补偿》2010年第4期47-52,共6页Power Capacitor & Reactive Power Compensation

摘　　要：结合无中间抽压端子的叠装式电容式电压互感器(CVT)原理,阐述了串联法测试CVT下节耦合电容C11和C2介损及电容值存在的问题。基于目前普遍使用的数字电桥,全面地分析了现场采用自激测试法(自激法)对CVT介损、电容值测试所涉及到的各方面值得注意的问题,如拆高压引线、拆二次回路、选择二次试验端子、选择合适试验电压等,并提出一定建议。同时对比了自激法与常规法测试结果,对CVT现场自激法测试的准确性进行验证。The problems existed in measuring the lower segment coupling capacitor C11 and C2 and capacitance of capacitor voltage transformer（CVT） by way of series connection method are introduced based on the principle of superposition CVT without intermediate voltage leading-off terminal.Also,issues needing attention in every aspect and related to the test of capacitance and dielectric loss of CVT by way of self-excitation method are firstly and comprehensively analyzed,such as removal of high voltage lead and of secondary circuit,selection of secondary test terminal and of appropriate test voltage,etc,suggestions are proposed.The test results of self-excitation and conventional method are compared and the correctness of CVT self-excitation method at site is verified.

关 键 词：电容式电压互感器(CVT) 试验方法 自激法 

分 类 号：TM451.2[电气工程—电器]