TEV和UHF在10kV开关柜带电检测中的应用

10、35 kV金属封闭式开关柜在变电站广泛使用,其运行安全直接影响整个变电站的供电可靠性。因此,对开关柜运行状态的监测及对故障的预判和合理检修是保证开关设备安全可靠运行的关键。笔者介绍了10 kV开关柜局部放电带电测试的TEV和UHF原理,并且成功检测出了深圳某变电站10 kV 2BM、3BM过渡CT柜532BCT柜存在局部放电信号,同时通过对532BCT柜的停电检查,发现532BCT柜中的隔离开关A相静触头是产生局部放电信号的源头所在,从而验证了采用TEV和UHF这两种原理相结合的方式检测10 kV开关柜故障的有效性,为较早地发现10 kV开关柜中的设备缺陷提供了有效检测方法和依据。

Application of TEV and UHF in PD Detection for the Live 10 kV Switchgear

Metal-enclosed switchgear rated voltage 10,35 kV in substations are widely used,which operating security directly affects the supply reliability of substation.Therefore,switchgear operating state monitoring,fault prejudging and reasonable overhaul are the key to guarantee safe and reliable operation of switchgear.The paper explains the principle of TEV and UHF in detecting 10 kV switchgear PD signal respectively.And it also shows the successful application of these two methods in detecting and discovering PD signal on 10 kV 532BCT switchgear of one station.Open and check the equipment,the PD signal has been found on 532BCT disconnecting switch of phase A.This example proves that the combination of both methods is effective in detecting switchgear defect and provides effective methods and basis for finding defects in 10 kV switchgear.