Status Monitoring of Line Arrester with Gaps
Senjing Yao · Guangdong Electric Power · 2011
Aiming at repeated strike from heavy current(greater than nominal discharging current in zinc oxide valve element) may result in aging of zinc oxide valve element,which influences performance of the arrester and thereby the operational safety of power system.According to characteristics of lightning current,a status monitoring method of line arrester with gaps is presented and a on-line monitoring device dispensing with additional power is designed.The device can record numbers of discharge of arresters with gaps and give alarm instructions under the circumstance that there are eighteen lightning strikes greater than 20 kV.The performance test shows that the device is characterized by superiority in visibility,action reliability and reusability;besides,the device can effectively monitor the state of life of arrester with gaps.