超高频扫描比较式局部放电在线监测系统

根据工频电压作用下局部放电具有工频周期重复性的特征,设计出一种新型的超高频扫描式局部放电监测系统。该系统运用高频放大滤波器、复杂可编程逻辑器件和高频比较器构成超高频局部放电智能监测单元,通过电平扫描的方法实现局部放电φ-q、φ-n、φ-q-n谱图及放电特征的提取,并通过网络将数据传送至后台主机。该系统不需要A/D采集卡,数据处理量少,扩展性好,成本低。实验表明该系统可进行实时在线监测,提取局部放电信号的放电幅值、放电次数等特征量。

Online partial discharge monitoring system by UHF scanning and comparison

The partial discharge under power frequency voltage has the characteristic repeatability of power frequency,according to which,a UHF-scanning-type of partial discharge monitoring system is designed.Its intelligent partial discharge monitoring unit is composed of the high frequency filter and amplifier,field programmable gate array and high frequency comparator,the φ-q,φ-n and φ-q-n spectrums of partial discharge and the discharge characteristic variables are extracted by pulse scanning,and the data are transferred to superordinate computer via network.Without A / D acquisition card and massive data processing,the designed system has good expansibility and low cost.Experiments show that,it can carry out the real-time monitoring of partial discharge and extract the characteristic variables,such as discharge amplitude,discharge times,etc.