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Study of the abnormal phenomena of capacitor voltage transformer (CVT) at Taiwan Power Company.

机译：台湾电力公司电容器电压互感器（CVT）异常现象的研究。

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摘要

In a power system capacitor voltage transformer (CVT) is usually used to provide the low voltage replica of the high line voltage both in magnitude and phase for protective relays or meters. A large number of CVTs are installed in many substations in Taiwan Power Company (TPC) and have experienced abnormal phenomena while in operation. The problems of the CVTs involve the frequent firing or failure of the gas discharging tube in the CVT installed both in 345 KV and 161 KV systems. This dissertation has devoted to investigating the cause of the firing of the CVT's gas discharging tube.; Two possible causes to the problems are suspected. The first one is the ferroresonance. Ferroresonance, known as the result of the interaction between capacitor and saturable inductor, is able to produce sustained over-voltage and damage the devices. In this dissertation Electro-Magnetic Transient Program (EMTP) is used to study the mathematical model of the CVT provided by the manufacturer. The ferroresonance phenomena of CVT are observed by EMTP simulation, which shows that ferroresonance should not be the cause of the whole problems.; The second possible cause is the induced voltage. Any disturbance, for example switching operation or lightning, in a substation may result in strong induced voltage on the low voltage circuit. In this dissertation, the mathematical model of the induced voltage and program are developed and confirmed by the field tests of TPC. The program is proved to be a good tool for the simulation of the induced voltage. The simulations show that the induced voltage can be the cause of the tube's firing and recommendations are given to solve the problem.
机译：在电力系统中，电容器电压互感器（CVT）通常用于为保护继电器或仪表提供幅值和相位都高的线路电压的低压副本。台湾电力公司（TPC）的许多变电站中都安装了许多无级变速器，并且在运行时会出现异常现象。 CVT的问题涉及安装在345 KV和161 KV系统中的CVT中的排气管频繁点火或故障。本论文致力于研究CVT排气管点火的原因。怀疑有两个可能的问题原因。第一个是ferroresonance。铁磁谐振，是电容器和可饱和电感之间相互作用的结果，能够产生持续的过电压并损坏器件。在本文中，电磁暂态程序（EMTP）用于研究制造商提供的CVT的数学模型。通过EMTP仿真观察到了无级变速器的铁磁谐振现象，这表明铁磁谐振不应成为整个问题的原因。第二个可能的原因是感应电压。变电站中的任何干扰（例如开关操作或雷电）都可能导致低压电路上产生强感应电压。本文通过TPC的现场测试，建立了感应电压的数学模型和程序，并进行了验证。该程序被证明是用于模拟感应电压的良好工具。仿真表明，感应电压可能是引起管子着火的原因，并提出了解决问题的建议。

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  • 作者

    Ke, Han.;

  • 作者单位

    The University of Texas at Arlington.;

  • 授予单位 The University of Texas at Arlington.;
  • 学科 Engineering Electronics and Electrical.; Energy.
  • 学位 Ph.D.
  • 年度 1996
  • 页码 126 p.
  • 总页数 126
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;能源与动力工程;
  • 关键词

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