基于同轴电容的过电压传感器研究  

Research on Overvoltage Sensor Based on Coaxial Capacitor

作　　者：王永强[1] 谢迎天[1] 燕迎祥[1] 施超[1] 

机构地区：[1]华北电力大学河北省输变电设备安全防御重点实验室,河北保定071003

出　　处：《电测与仪表》2013年第9期109-113,共5页Electrical Measurement & Instrumentation

摘　　要：针对过电压在线监测系统难以准确实时获取过电压波形的问题,提出一种基于同轴电容的电子式电压互感器设计方案,通过ANSYS仿真验证了建立的同轴电容器模型是可行的。对比了采用ANSYS的CMATRIX宏命令求得的电容值与采用公式法求解电容值的差异,而且用仿真结果指导了同轴电容的结构设计。该电子式电压互感器内绝缘采用了复合绝缘技术,保证了同轴电容具有良好的温度特性与频率特性。此外,建立了该测量系统的电路模型,并确定了决定分压比的主要因素。To address the difficulty of getting accurate and real-time over-voltage signal from power system at on-line o- ver-vohage monitoring system, this paper presents a design description of Electronic Voltage Transformer based on co- axial capacitor. It proves that the structure of coaxial capacitor is feasible through the ANSYS simulation. And it states the difference of capacitance value between method of CMATRIX and method of formula. Inner insulation adopts the composite insulation technology to ensure that the coaxial capacitor has excellent temperature characteristic and fre- quency characteristic. Measurement system of the circuit model is built, which determines the main factors that decid- ed the pressure ratio.

关 键 词：同轴电容 ANSYS 复合绝缘 分压单元 

分 类 号：TM86[电气工程—高电压与绝缘技术]