用超高频局部放电测量法实现电力变压器局部放电的在线监测

高频局部放电测量法(UHF法)与传统的脉冲电流法完全不同，它采集的被测信号为局部放电过程所产生的超高频电磁波：利用UHF法可有效解决电力变压器局部放电在线监测中的抗干扰问题。文中结合变压器结构设计的放油阀式和人孔／手孔盖式超高频信号传感器安装在220kV和110kV电压等级变压器上，成功地捕捉到变压器内部局部放电产生的超高频信号。对变压器局部放电故障诊断的判据等问题进行讨论，为变压器超高频局部放电在线监测方法的应用积累了经验。

Partial discharge detection on-line in transformer using UHF

The partial discharge measurement with ultrahigh frequency (UHF) is completely different from conventional impulse-currentmeasurement, which collects the measured signal of ultrahigh frequency electromagnetic wave produced in the course of partial discharge.To use UHF can efficiently solve the problem of anti--interference in online monitoring of power transformer partial discharge. The paperintroduces that the ultrahigh frequency signal produced by partial discharge in internal transformer can be found successfully, combinedwith the transformer structural design that the ultrahigh frequency signal sensors with the types of oil drain valve and manhole/hand holecover are installed in 220 kV and 110 kV transformers. The paper discusses the problems such as criterion for the fault diagnosis of transformerpartial discharge, Which accumulates the experiences for the application of online monitoring method of ultrahigh frequency partial dischargeof transformer.