摘要
针对经超过氧化锌阀片经过一定值的大电流(大于氧化锌阀片标称放电电流)多次冲击后出现老化现象,影响线路避雷器的性能,从而影响电力系统安全运行的问题,根据雷电流的特性,提出一种带间隙线路避雷器的状态监测方法,并设计了一种无需外加电源便可记录带间隙避雷器放电次数的在线监测装置,该装置在幅值大于20kV雷电流、冲击次数达到18次时发出告警指示。性能测试表明,该装置具有可视性好、动作可靠及可重复使用的优点,并能有效监测带间隙避雷器的寿命状态。
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.
出处
《广东电力》
2011年第5期46-50,共5页
Guangdong Electric Power
关键词
带间隙避雷器
雷电流
状态监测
寿命特性
arrester with gaps
lightning current
status monitoring
life performance
