基于RS-485总线的金属氧化物避雷器在线监测系统的研究

On-line Monitoring System for Metal Oxide Arresters Based on RS-485 Bus

分析了影响金属氧化物避雷器(以下简称MOA)在线监测准确性的主要因素,比较了MOA主要的几种在线监测方法,指出了国内外MOA在线监测装置存在的问题。提出了可同时测量三相电压、电流及温度的基于RS-485总线分布式结构的MOA测量系统,它可以对现场所有MOA进行在线监测。研究了三相电压、电流及温度数据的采集方法,提出了基于三相谐波分析法的数据处理模型。该在线监测系统可以有效地减小相间干扰和电网谐波的影响,更全面地反映MOA的运行状况。

The main influencing factors of online monitoring for MOA are indicated.The advantages and weakness of various diagnostic methods for MOA monitoring known are discussed.A new online monitoring system based on RS485 bus is designed to monitor all MOA at site by measuring the three phase voltages,currents and temperatures at the same time.The author introduces the signal measurement method of three phase voltage,current and temperature,describes the data processing model based on threephase harmonic analysis method.The monitoring system can effectively eliminate the influences of both coupling interference and system voltage harmonics,diagnose the performances of MOA more exactly.