基于电容分压原理的电子式TV一次侧设计  

Design of Primary Converter for Electronic Voltage Transformers Based on Capacitive Divider

作　　者：肖霞[1] 张忠学 徐雁[1] 叶妙元[1] 韩世忠[1] 向珂[1] 

机构地区：[1]华中科技大学电气与电子工程学院,武汉430074 [2]广州番禺明珠电器有限公司,广州511400

出　　处：《高电压技术》2006年第5期15-18,共4页High Voltage Engineering

摘　　要：介绍了CEVT的工作原理及系统组成,研究了基于电容分压原理的电子式电压互感器(CEVT)一次侧系统,分析了二次电阻分压电路对电容分压系统的幅值和相位影响。结果表明,二次分压电阻的引入不会对分压比造成影响,但所引入的相位误差不能忽视。详尽研究了A/D转换及驱动电路后实现了用同步时钟速率模拟异步发送的方式实现数据的单光纤发送。所研制CEVT一次侧系统的温度特性试验结果表明,在-40°C^+40°C的范围内,其温度稳定性优于±0.2%。整个CEVT系统的型式试验表明,其线性度优于0.2级。The primary converter of the electronic voltage transformer （CEVT） based on the capacitive divider is described. The principle and the system constituted of CEVT are expatiated. The secondary resistive divider of the transducer affects the phase error of CEVT but no affection on the divider coefficient. The A/D converter is the critical component for designing the primary side circuit. It analyzes A/D converter and its driver circuit in detail, which uses ADS8325 as A/D converter and provides excellent performances, such as high resolution, low temperature coefficient and low power consumption. It realizes the single optical fiber data transmitting through imitating asynchronous transmitting with synchronous clock rate. The temperature tests show that the temperature characteristic is within ±0. 2% with the range -40℃～＋40℃. The type tests of the CEVT show that the linearity characteristic is within ±0. 2%.

关 键 词：电容分压器 电子式电压互感器 A/D转换 FPGA 电光转换 

分 类 号：TM451[电气工程—电器]