基于星形WSN的变电站低压避雷器监测系统

Low Voltage Surge Arrester Monitoring System in Substations Based on Star-WSN

低压避雷器主要用于变电站站内交直流系统线路保护,由于电压等级和成本较低而常被忽略检测,因而经常会发生交流系统多点接地故障。常见的避雷器监测系统大都是针对一次侧的高压避雷器,系统复杂,成本较高,无法在低压避雷器上应用推广。文章提出一种三线制单点接触的方法,用于测量低压避雷器状态,解决了安装复杂问题,降低了系统成本,并且无需跨接避雷器两端进行避雷器状态测量。实验表明,通过加入模拟交流信号进行测试,单点接触式传感器可以检测到最低0.5 Vrms的交流信号。该系统已用于实际变电站,运行结果表明可以满足变电站交流系统避雷器的监测需求。

Low voltage surge arrester is mainly used for the protection of AC and DC system in substation,but always be ignored for its low voltage level and low cost, so muhipoint grounding occurs constantly. Common lightning arrester monitoring system is designed for high voltage surge arrester,due to its high complexity and cost,it is hard to be promoted. A single point attachment based detection method was proposed with only 3 wires needed, so the surge arrester can be monitored without being bridged over, and the high system complexity and cost problems were solved. Experiment shows that, the single point attachment based sensor finally we devised can detect AC signals down to 0.5 Vrms. This system has been applied to the actual substation, and the results show that it can meet the requirement of monitoring the AC system in the substation.