单极电容式电压互感器的试验研究  

Experimental Research of Unipolar Capacitive Voltage Transformer

作　　者：周强[1] 何为[1] 李松浓[2] 侯兴哲[2] 李登云[3] 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400030 [2]国网重庆市电力公司电力科学研究院,重庆400044 [3]中国电力科学研究院,武汉430074

出　　处：《高电压技术》2016年第6期1781-1789,共9页High Voltage Engineering

摘　　要：电力系统中传统电压互感器存在体积大、对绝缘水平要求高等问题。针对上述问题,旨在研究一种新式的非接触式电压互感器,以降低电压互感器的绝缘设计难度、扩大电压互感器的使用场合等,其互感器设计采用基于电场耦合原理,设计单极式的结构解决了传统电压互感器由于接地极导致的绝缘设计难度大、成本高的问题;检测电路采用差动式的信号输入结构,有效抑制了共模干扰信号的影响;通过对互感器的建模仿真计算,优化了互感器电极的结构设计,实现了互感器的小型化,提高了互感器的分压比并有效减小了互感器测量的相位差。将电压互感器应用于单相10 k V电压等级下进行试验,试验结果表明,所设计的互感器可以满足对带电导体电压准确、实时的测量要求,能够为电力系统中防窃电及电网在线监测提供新的设计方法。In the power system, the traditional voltage transformer has a large size and a high level of insulation. In view of the above questions, we researched a new non-contact voltage transformer, which could reduce difficulty in voltage transformer insulation design and expand the application of voltage transformer. On the basis of the electric field coupling principle, we designed a new voltage transformer. The design of unipolar structure has solved problems of traditional voltage transformer such as great difficulty in insulation design and high cost caused by grounding electrode. Differential signal input structure is adopted for the detection circuit, which has effectively restrained the influence of common-mode interference signal. The voltage transformer is applied to the single-phasevoltage class of 10 k V for test. According to the test results, the designed transformer can meet the requirements of accurate and real-time measurement for voltage of the charged conductor as well as provide a new method for electricity larceny prevention and on-line monitoring of power grid in electric system.

关 键 词：电压互感器 绝缘设计 工频电场 电场数值仿真 空间电场强度 

分 类 号：TM451[电气工程—电器]