空心线圈电流互感器传变特性及其对继电保护的适应性分析

Analysis on Transfer Characteristics of Air-Core Current Transformer and Its Adaptability to Relay Protection

为了系统地分析空心线圈电流互感器传变特性及其对继电保护的影响,针对具体的互感器物理结构,采用理论、实验和仿真分析的手段,研究空心线圈电流互感器传感头和整体的频率特性和暂态特性。揭示了互感器较宽的频带特性有利于提高继电保护性能,频带宽度主要由Rogowski传感头和信号处理电路特性参数决定;暂态电流的测量误差关键取决于互感器对衰减非周期分量的刻画能力,即主要由非周期分量衰减时间常数和积分单元特性参数决定。最后,进一步从结构设计和测试标准方面提出空心线圈电流互感器应用于继电保护系统的适应性措施。

Based on concrete physical structure of air-core current transformer, both frequency characteristics and transient characteristics of its sensing head and the whole transformer are researched by theoretical analysis, experiments and simulation to analyze its transfer characteristics systemically and its impacts on protective relayings. It is revealed that the wider band characteristics of air-core current transformer is favorable to improve the performance of protective relayings, and the bandwidth is mainly dependent on Rogowski sensing head and characteristic parameters of signal processing circuit; the measuring error of transient current is mainly dependent on the transformer＇s ability of depicting the decaying aperiodic component, namely it is mainly dependent on the decay time constant of aperiodic component and the characteristic parameters of integral unit. Finally, in the aspects of structural design and testing standard the adaptive measures for applying air-core current transformer to relay protection system are proposed.