基于UHF天线阵列的变电站局部放电全站监测研究与实践

Research and Practice of Partial Discharge Online Monitoring and Locating for Substation Using UHF Sensor Array

变电站电力设备的局部放电全站监测是电力设备绝缘状态监测的发展方向之一,基于特高频传感器阵列的局部放电全站监测与定位方法是近几年提出的新方法之一。本文对该方法中基于传感器阵列中各传感器接收同源局部放电特高频脉冲信号的时延进行定位的基本原理和关键技术,包括信号传播、时延估计、定位算法和定位误差等问题,进行了详细探讨,并基于对所研制系统实际监测的变电站真型电力设备局部放电仿真试验数据和变电站日常运行实例所进行的分析,阐释了该方法的应用条件与改进方向。

Partial discharge monitoring for all power equipment in substation is one of the developing direction of insulation condition monitoring. In recent years, Partial discharge monitoring using UHF sensor array is a new proposed method. This paper discusses in detail the basic principle and key technology of partial discharge detection and locating by calculating the time delays of partial discharge pulse signals from the same source received by UHF sensors of an array, including the signal propagation, time delay estimation, location algorithm, the locating accuracy. The proposes about the application condition and function promotion of the monitoring system are given based on the simulation experiments on the real power equipment and daily examples.