应用带电检测技术对开关柜早期缺陷的诊断

针对高压开关柜早期局部放电缺陷发现率低,故障信号源定性困难,定位准确率差的问题,结合现场实际案例进行分析,提出了基于暂态低电压、特高频和超声波的带电检测方法及幅值定位法和时差定位法的定位技术。应用结果表明:带电检测技术能够在开关柜早期缺陷诊断中发挥重大作用,并有利于设备状态评价与检修工作的开展。

Diagnosis of applying live detection technology in the early defect of switchgear

Aiming at the problems such as low rate of the early partial discharge defect discovery,difficult determination of the fault signal sources and poor accuracy of the position for HV switchgear,combining with the practical cases the above problems were analyzed, and the live detection methodswere put forward based on the transient earth voltage, ultra high frequency and ultrasonic methods , aswell as the positioning technology based on the amplitude positioning method and time differencepositioning method. The application resultsshow that the live detection technology can play asignificant role in the early defect diagnosis of the switchgear, which is beneficial to operate thestate conditioning evaluation and maintenance of the equipments.