局部放电在线监测系统之隔离保护单元的研究

Study on Insulating and Protecting Unit of An on-line Monitoring System of Partial Discharge

随着局部放电在线监测系统在电力设备中大量使用,如何解决大型电力设备一次侧过电压、大电流信号对在线监测系统的干扰及破坏难题成为亟待解决的问题。通过对不同尺寸、不同匝数比和不同匹配阻抗下的锰锌铁氧体线圈的频带性能、方波响应性能测试实验,结果表明:适当匝数比和匹配阻抗的锰锌铁氧体线圈可以有效地抑制系统过电压和大电流信号对在线监测系统干扰和破坏。

With the widely used of an on-line monitoring system of PD in the large electric equipments, how to deal with the interference and damage which the large electric equipment primary lateral over-voltage and large-current signals do to an on-line monitoring system, is becoming an imperative problem. Through the monitoring on the frequency performance and square-wave response performance of Manganese-Zinc ferrite coil withdifferent sizes, different ratios of winding and different matching impedances, the result shows that Manganese-Zinc ferrite coil with proper ratio of winding and matching impedance can effectively restrain the interference and damage which the over-voltage and large-current signals of the power system do to the on-line monitoring system.