一种无源型避雷器性能在线监测装置的研究与设计

Research and Design of a Performance Online Monitoring Device for the Passive Arrester

安装于开关柜内的避雷器是防止柜内设备过电压的重要保护装置,避雷器劣化的重要特征是泄漏电流增加。现有的避雷器性能监测装置,必须提供外部二次电源,而在很多场合开关柜内部不具备二次电源,这样给避雷器性能监测带来一定的困难。为了在无源情况下实现避雷器性能的监测,提出研究一种新型无源型避雷器性能在线监测装置,该装置利用避雷器泄漏电流,结合能量收集电路,获得避雷器在线监测的能量,进而实现避雷器不需要借助外部电源的情况下,可以就地显示避雷器总泄漏电流和总雷击次数。装置经测试使用满足现场避雷器性能监测的要求。

The installation of the arrester in the switch cabinet is an important protection device to prevent the over-voltage of the equipment in the cabinet. The important feature of the deterioration of the arrester is the increase in leakage current. The existing performance monitoring device for the arrester must provide an external secondary power supply. In many cases, there is no secondary power supply inside the switch cabinet, so it is difficult to monitor the performance of the arrester. In order to realize the arrester’s performance monitoring under passive condition, a new type of performance online monitoring device for the passive arrester is proposed. The device uses the arrester leakage current, combined with the energy harvesting circuit, to obtain the energy for online monitoring on the arrester. Thus, it can display the total leakage current of the arrester and the count of lightning strokes without any external power supply. It has been tested that the device can meet the requirements of on-site performance monitoring on the lightning arrester.