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Analysis of internal winding short circuit faults in power transformers using transient finite element method coupling with external circuit equations

机译：瞬态有限元法结合外部电路方程分析电力变压器内部绕组短路故障

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摘要

Interturn short circuit faults are the leading cause of power transformer failures. If not quickly detected, these faults usually develop into more serious faults, which would result in irreversible damage to the transformer, unexpected outages, and consequential costs. The aim of this research is to obtain a better understanding of the physical behavior of the power transformers in the presence of interturn faults as well as to discover the best indicators for detection of interturn short circuit faults. To this end, a time stepping finite element model of power transformer has been developed to analyze the transient behavior of a real power transformer when the transformer is working under winding short circuit fault conditions. The transient model, coupled with external circuit equations, allows us to simulate the dynamic behavior of the transformer with the real power supply and external loads connections. The FEM computations show the ability of the electromagnetic flux inside the transformer, transformer terminal currents, and circulating current in the shorted turns as useful monitoring parameters for transformer fault detection.
机译：匝间短路故障是电力变压器故障的主要原因。如果不能迅速发现，这些故障通常会发展为更严重的故障，这将导致变压器的不可逆转损坏，意外中断和随之而来的成本。这项研究的目的是为了更好地了解存在匝间故障的电力变压器的物理性能，并发现用于检测匝间短路故障的最佳指标。为此，已经开发了电力变压器的时间步进有限元模型，以分析实际电力变压器在绕组短路故障条件下工作时的瞬态行为。瞬态模型与外部电路方程式相结合，使我们能够通过实际电源和外部负载连接来模拟变压器的动态行为。有限元分析计算表明，变压器内部的电磁通量，变压器端子电流和短路匝中的循环电流的能力可作为有用的监测参数，用于变压器故障检测。

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  • 来源
    《International journal of numerical modelling》 |2013年第5期|425-442|共18页
  • 作者

    Vahid Behjat; Abolfazl Vahedi;

  • 作者单位

    Center of Excellence for Power System Automation and Operation, Iran University of Science & Technology, Narmak 16846, Tehran, Iran,Center of Excellence for Power System Automation and Operation, Iran University of Science & Technology, Tehran, Iran;

    Center of Excellence for Power System Automation and Operation, Iran University of Science & Technology, Narmak 16846, Tehran, Iran;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    power transformer; circuit-coupled FEM model; interturn fault;

    机译：电源变压器;电路耦合有限元模型匝间断层;

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