作　　者： ; ; ;

机构地区： 广东电网公司

出　　处： 《电力电容器与无功补偿》 2020年第2期64-69,共6页

摘　　要： 通过对CVT事故类别进行分析发现,包括电容器部分损坏、电磁单元短路、铁磁谐振等的CVT主要故障均可以一定程度通过二次电压变化得以体现,因此有必要结合日常生产工作中发现的各类互感器故障,深入研究CVT暂态故障发展过程中波形变化规律,将暂态电压波形特征量作为CVT运行状态监测和缺陷辨识依据,及时发现CVT缺陷保证系统安全稳定运行。本文结合一起500 kV CVT缺陷导致故障录波电压多次发生2倍以上异常升高,最终引起CVT二次电压消失案例,通过解体对故障原因进行了深入分析,运用仿真计算对录波波形进行了复现,从而明确了暂态波形特征量及其对应的缺陷类型,得出结论可为互感器运行状态监测及缺陷原因的判断提供依据。 It is found through the fault analysis of capacitive voltage transformer(CVT)that such min fault of the CVT as partial damage of capacitor,short circuit of electromagnetic unit and ferromagnetic resonance canbereflectedthrough,toacertainextent,thesecondaryvoltagevariation.Therefore,itisnecessaryto,with combination of faults of various instrument transformers which is found during the daily production work,study deeply the variation rule of waveform during the development of CVT transient faults,use the waveform feature as the basis for monitoring and discriminating the potential fault of the transformer and discover the CVT defects in time to ensure the safe and stable operation of the system.In this paper,the reason of the fault of 500 kV CVT is analyzed deeply by way of disassembly combined with abnormal rise of fault recording voltage with more than 2 times due to the defect of the CVT and eventually leading to secondary voltage disappear.The recording waveform is reproduced by the simulation calculation so to define the transient waveform feature and corresponding detect type and the conclusion can be used to provide a basis for the monitoring of the operating state of the transformer and the determination of the cause of the defect.

关 键 词： 电容式电压互感器 故障录波 电压监测 故障分析

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