CT型避雷器智能在线监测装置的研究

Research on CT Type On-line Smart Monitoring Device of Surge Arrester

目前国内许多避雷器智能监测系统都要求采用非接触监测方式(CT型)。这种监测方式可实现监测装置与避雷器非电气连接,杜绝了地电位升高对监测装置的影响。当避雷器通过高幅值冲击电流时,在CT二次侧会产生过电压,对监测系统造成损坏。本文论述了能耐受高幅值冲击电流的CT结构和放大器保护系统,以及避雷器阻性电流的测量方法。

At present, many domestic smart monitoring systems of the surge arresters are required to use a non-contact monitoring method （CT type）. Non-electrical connections between the monitori, ng devices and the surge arresters can be realized with this monitoring method. The influence of the ground potential rise on the monitoring device could be eliminated. An overvohage could occur in the secondary side of CT when an impulse current with high amplitude flowed through a surge arrester. It caused damage to the monitoring system. The amplitude, the amplifier protection system and arrester were discussed in the paper. CT structure to withstand the impulse current with high the measurement method of the resistive current of surge