阻尼电流在CVT故障分析中的作用探讨

电容式电压互感器(CVT)是由电容分压器和电磁单元组成的具有独特结构的一种电气设备,其阻尼回路对抑制铁磁谐振等具有独特作用。现场运行过程中,由于缺乏对阻尼回路对应的预试方法,无法对阻尼回路进行相应技术监督,由于阻尼回路频繁故障导致紧急抢修工作。本文通过一例35 kV CVT阻尼回路故障的发现、分析和处理过程,提出了一种适用现场的阻尼回路预试方法,并对现场运行检修人员及早发现CVT故障提出了相应建议。

Discussion on the Effect of Damping Current in the Fault Analysis of CVT

Capacitive voltage transformer(CVT) is a kind of electrical equipment,consisting of capacitive voltage divider and electromagnetic unit and having unique structure,and its damping circuit has particular effect in inhibiting ferromagnetic resonance.During operation period at site,correesponding technical supervision on the damping cirucit can not be done due to lack of corresponding pretesting method of the damping circuit,thus leading emergency repair due to frequent fault of the damping circuit.In this paper,a kind of method which is suitable to pretesting damping circuit at site is proposed through finding,analysis and treatment process of the damping circuit of one 35 kV CVT and corresponding suggestion to the site operation and maintenance staffs to find out the fault of CVT as early as possible is given.