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A Novel Method to Discriminate Inrush Current from Internal Fault Based on Primary and Second Harmonic Energy

SHEN HongmingLIU YingCHEN WeiZHANG XianglongDU Na

State Power Economic Research Institute Co.,LTD

摘要:To discriminate inrush from an internal fault is a hot topic,as the inrush current may cause transformer differential protection to malfunction.Compared with Fourier algorithm,prony analysis can get amplitude and attenuation factor of one signal.Thus,prony analysis may have a better effect in discriminating inrush current.First,the energy concept of primary and second harmonic is first proposed based on prony analysis in this paper.Then,according to the study of attenuation characteristics of fundamental and second harmonic,it is found that the ratio of fundamental energy to second harmonic energy has a big difference in inrush current and internal fault.Thus,a novel method based on primary and second harmonic energy is presented.Simulation results of PSCAD prove the method to be correct.
会议名称:

2019 4th Asia Conference on Power and Electrical Engineering (ACPEE 2019)

会议时间:

2019-03-28

会议地点:

中国浙江杭州

  • 专辑:

    工程科技Ⅱ辑

  • 专题:

    电力工业

  • 分类号:

    TM774

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