摘要
为了解决光学电压互感器中晶体材料的耐压问题,提出了采用分布式精密电容分压器的解决方案,并结合互感器使用环境建立了电力系统中高压电容分压器的数学模型,然后利用该模型与分压器误差特性的联系,重点分析了温度变化、杂散电容、相间干扰等误差因素对电容分压器的影响,并对这些误差因素的影响进行了合成。基于以上理论和误差分析方法应用有限元软件对220 kV电容分压器进行了仿真计算,分析结果表明,合理选择电容分压器的主电容值可以使电容分压器的精度在0.1%以内,这为精密电容分压器的设计提供了理论依据。
In order to solve the enduring voltage problem of crystal materials in optical voltage transformers （OVT）, a scheme is proposed based on distributed precise capacitive divider. The mathematical model of a high-voltage capacitive divider in power system is established in consideration of application environment of the transformer. Based on the relationship between the model and error characteristics of the capacitive divider, the impacts of error factors such as temperature changes, the stray capacitance and inter phase interference etc. to capacitive voltage dividers are particularly analyzed and synthesized. Based on above theory and error analysis method, a simulation is completed for 220 kV capacitor divider with the finite element software. The simulated results show that the accuracy of capacitive divider smaller than 0.1 percent if main capacitive value of capacitive divider is properly selected, which provides theoretical basis for designing capacitive divider.
出处
《电力系统自动化》
EI
CSCD
北大核心
2009年第8期72-76,80,共6页
Automation of Electric Power Systems
关键词
光学电压互感器
电容分压器
杂散电容
相间干扰
误差综合
optical voltage transformer
capacitive voltage divider
stray capacitance
inter phase interference
error synthesis
