基于瞬态油流量测量的电力变压器故障油流涌动特性研究
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国网安徽省电力有限公司电力科学研究院

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国家电网有限公司总部科技项目(52120518000P)


Research on action delay of fault oil flow in power transformer based on transient oil flow measurement
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Electric Power Research Institute,State Grid Anhui Electric Power Company Limited,

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    摘要:

    变压器一直是电网中的重要设备,这类关键设备的任何故障都将严重影响电力系统的可靠性和稳定性。作为变压器的主保护,瓦斯保护动作的可靠性一直备受关注。近些年,外部短路冲击下瓦斯保护误动的事故屡次发生,严重威胁变压器运行效率。为了探究外部短路故障时管道内的油流特性,本文在电力变压器上建立了瞬态油流测量系统,开展了外部短路故障测试试验。试验结果证实,短路电流引起的变压器绕组变形和振动会导致油流涌过管道。由于液体惯性,本文试验所测得的油流动作出现的时间延迟长可达数百毫秒。实际运行中的瓦斯保护误动时间滞后于外部故障的时间也长达数百毫秒,这与油流动作的延时现象相符。试验还表明,故障的严重程度和位置都会对油流动作产生影响。最后,本文给出的油流动作延迟结果可以为进一步研究油流冲击和瓦斯保护误动的机理提供重要的参考。

    Abstract:

    Transformer has always been an important equipment in the power grid. Any failure of such key equipment will seriously affect the reliability and stability of the power system. As the main protection method of transformer, the reliability of gas protection action has always been concerned. In recent years, the accident of misoperation of gas protection under the impact of external short circuit occurs frequently, which seriously threatens the operation efficiency of transformer. In order to explore the characteristics of oil flow in the pipeline when the external short-circuit fault occurs, this paper establishes a transient oil flow measurement system on the power transformer and carries out the external short-circuit fault test. The test results show that the transformer winding deformation and vibration caused by short-circuit current will lead to oil flowing through the pipeline. Due to the inertia of the liquid, the time delay of the oil flow measured in this paper can reach hundreds of milliseconds. In actual operation, the time of misoperation of gas protection lags behind the external fault for hundreds of milliseconds, which is consistent with the delay phenomenon of oil flow action. The test also shows that the severity and location of the fault will affect the oil flow surge. Finally, the results of oil flow action delay given in this paper can provide an important reference for further study on the mechanism of oil flow shock and misoperation of gas protection.

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  • 收稿日期:2020-09-28
  • 最后修改日期:2020-11-07
  • 录用日期:2020-11-12
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