基于振荡波的干式空心电抗器局部放电检测方法

摘要

干式空心电抗器在电网的无功功率调节方面发挥着重要的作用,但是干式空心电抗器在工作过程中,由于绝缘材料老化,局部过热等原因可能导致电抗器出现短路故障,产生恶性事故,造成巨大的经济损失.目前检测空心电抗器绝缘性能检测方法是通过比较故障电抗器的电感量的变化而引起的电抗器两端电压振荡波的衰减情况及频率的变化,从而判断空心电抗器是否存在故障.本文通过建立振荡波系统仿真模型,确定振荡回路参数,在振荡过程中检测空心电抗器局部放电量,其中局部放电检测包括特高频法,高频法,脉冲电流法,超声波法及综合检测电抗器的局部放电,经过试验表明能够发现空心电抗器潜在故障,避免恶性事故的发生.%Dry-type air-core reactor plays an important role in regulating reactive power of grid.However, during the operation period of the reactor, the short circuit fault can caused by such reasons as aging of insulation material, partial over heat etc, resulting in serious accident and causing huge economic losses.At present, the insulation performance detection method of the air-core reactor is to judge whether the reactor has fault by way of comparing both decay and frequency variation of the voltage oscillation wave on both sides of the reactor which is caused by the inductance variation of the reactor.In this paper, the parameters of oscillation circuit is determined by setting up the simulation model of the oscillation wave system so to detect the partial discharge during the oscillation period, in which the partial discharge detection contains such method as ultra-high frequency method, high frequency method, pulse current method and ultrasonic method as well as comprehensive detection.It is shown by the test that the potential fault of the air core reactor can be found and the occurrence of malignant accident can be avoided.