摘要
为改善特高压电容式电压互感器(CVT)的工艺结构,提高其瞬态性能和可靠性,研究了其宽频阻抗特性的测量和建模方法。首先,通过不同的测量方法获得了压接型和焊接型工艺结构的1 000 kV特高压CVT电容分压器的宽频阻抗特性,并相互验证了测量方法的有效性;其次,基于特高压CVT电容分压器的宽频阻抗测量数据,建立了具有物理意义的宽频等效电路模型,通过宽频阻抗仿真结果与测量结果的比较验证了模型的正确性和有效性;最后,定义了评价CVT性能的网络函数,并对特高压CVT电容分压器的蓄积电阻与蓄积电感、电容器电容与电导、均压环对地电容等电路参数进行了灵敏度分析,为特高压CVT的优化设计、瞬态分析和工艺改进等提供了依据。
To improve the manufacture technique, transient performance, and reliability of ultra high voltage（UHV） capacitor voltage transformers（CVT）, we studied its impedance measurement and wideband circuit modeling method based on frequency-domain data. In order to obtain the frequency-dependent impedance, we adopted various methods to measure the impedance of two types of CVT capacitor voltage dividers, namely, the compression type and the welding type. The wideband impedance measurement results were validated using the two different impedance measurement methods. Thereby, we developed a CVT wideband equivalent circuit model with physical denotation, which was verified through comparing with the measurements. Furthermore, we defined several electrical network functions and analyzed the sensitivity of CVT circuit parameters, such as accumulation resistance, accumulation inductance, capacitor capacitance, capacitor conductance, and ground capacitance of grading ring. The results could be used as references for optimizing design, fabrication technology and transient performance analysis for UHV CVTs.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2014年第6期1828-1838,共11页
High Voltage Engineering
基金
国家"十二五"科技支撑计划(2011BAA01B01)
国家电网公司科技项目(SGTGYJSFW[2012]304)~~
关键词
特高压
电容式电压互感器
电容分压器
阻抗测量
参数灵敏度分析
矢量匹配法
宽频电路
ultra high voltage
capacitor voltage transformer
capacitor voltage divider
impedance measurement
parameter sensitivity analysis
vector fitting
wideband circuit
