摘要
与常规电压互感器相比,电子式电压互感器对暂态电压具有潜在的传变优势。通过建立典型电子式电压互感器的等值电路,构建传递函数并分析其频率响应特性;基于传递函数,建立典型电子式电压互感器的PSCAD仿真模型,仿真分析其暂态响应特性;从故障暂态、冲击响应、阶跃响应等方面分析比较电子式电压互感器与电容式电压互感器对不同暂态电压信号的传变性能。分析表明,电子式电压互感器比常规电压互感器具有较好的频率响应和暂态响应特性。其中,光学电压互感器性能最为优异,是宽频电压感知的理想互感器;电容分压型电子式电压互感器不能传变直流分量,一般只用于交流电压测量;电阻分压型电子式电压互感器受杂散电容影响较大,其测量频带受限,一般只在中低压等级电网使用。仿真分析结果对用于电网电压测量的互感器选型具有一定的指导意义。
Compared with conventional voltage transformers,electronic voltage transformers(EVTs)have potential transfer advantages in transmitting transient voltage.Firstly,the equivalent circuit of typical electronic voltage transformer was established,the transfer function was constructed to analyze its frequency response characteristics.Then,the PSCAD simulation model of typical electronic voltage transformer was established based on the transfer function to simulate and analyze its transient response characteristics.Lastly,the transmission performance of electronic voltage transformer and capacitive voltage transformer for different transient voltage signals was analyzed and compared from the aspects of fault transient,impulse response and step response.The analysis shows that the electronic voltage transformers have better frequency response and transient response characteristics than the conventional voltage transformers.The optical voltage transformer has the best performance and is the ideal voltage transformer for broadband voltage sensing.The capacitive divider type electronic voltage transformer can not transfer DC component,so it is generally only used for AC voltage measurement.Due to the great influence of stray capacitance,the measurement frequency band of the resistive divider type electronic voltage transformer is limited,and it is generally only used in the middle and low voltage power grid.The results of simulation analysis have a certain guiding significance for the selection of voltage transformer used for voltage measurement in power grid.
作者
李其莹
尹东
刘祥国
万斌
于文斌
LI Qiying;YIN Dong;LIU Xiangguo;WAN Bin;YU Wenbin(State Grid Shandong Electric Power Company Taian Power Supply Company,Taian 271000,China;State Grid Shandong Electric Power Company,Jinan 250001,China;Harbin Institute of Technology,Harbin 150001,China)
出处
《山东电力技术》
2022年第10期44-52,共9页
Shandong Electric Power
基金
国网山东省电力公司科技项目“GIS暂态壳体电压光学在线监测技术研究与装置研制”(5206091900GJ)。
