罗氏线圈电子式电流互感器的宽频域传变特性研究

Ｒesearch on Wide － frequency － domain Transfer Characteristics of Electronic Current Transformer with Ｒogowski Coil

摘要:

智能变电站的大量投运,使得罗氏线圈电子式电流互感器的运用也愈发广泛。在阐述罗氏线圈传感单元原理基础上分析其传变特性影响因素,计算了传感单元以及外积分环节的传递函数,得到了其频率响应特性。在Matlab和PSCAD仿真平台上分别搭建了理想实验模型和实际电网模型,验证了理论推导正确性,为改进罗氏线圈电子式电流互感器传变性能提供了理论指导。

关键词:罗氏线圈;电流互感器;传变特性;频率响应特性;空载合闸;

Abstract:

The large － scale commissioning of intelligent substations has made electronic current transformer with Ｒogowski coil more widely used． Based on the principle of sensing unit of Ｒogowski coil ，the influencing facfors of its transfer characteristics are analyzed，the transfer function of sensing unit and external integration link is calculated，and its frequency response characteristics are obtained． The ideal experimental model and the actual power grid model are established respectively with Matlab and PSCAD simulation platform． The correctness of the theoretical derivation provides a theoretical guidance for improving the transfer characteristics of electronic current transformer with Ｒogowski coil．

Key words:Ｒogowski coil; current transformer; transfer characteristics; frequency response characteristics; unloaded switching