超声波法和 TEV 法在开关柜局部放电测量中的应用研究

摘要

Based on the principle of ultrasonic method and TEV method , a study was done on the method to measure different types of partial discharge in swichgear cabinet .Results showed that surface discharge and corona discharge of cabinets were often followed by strong abnormal ultrasonic signal , so it's more efficient to measure partial discharge with ultrasonic method; as for inside discharge of cabinets , it's more efficient to measure partial discharge with TEV method . Besides, a study was done on the effects of different interference sources on these two methods and measures to attenuate the effect was put up.%基于超声波法和 TEV 法的测量原理，对开关柜内不同形式局部放电的测量方法进行了研究。结果表明，设备表面放电和电晕放电通常会有较强的超声波异常信号，因此适合采用超声波法测量；对于设备内部放电，高频电磁信号可以通过绝缘不连续点传输到设备外壳而产生暂态对地电压，而超声波信号通过介质传播发生了较大的衰减，因此通常适合采用 TEV 法测量。此外，研究了不同的干扰源对两种测量方法的影响，并提出了减弱干扰影响的措施，可为工程实践提供借鉴。