基于相间电流突变特征的可调消弧线圈接地系统选线方法
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TM862

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国家自然科学基金( 51777014);湖南省重点研发项目(2018GK2057);湖南省教育厅重点项目(18A124);长沙市科技计划项目(kq1901104)


A faulty feeder selection method for adjustable arc-suppression coil system based on phase-to-phase current mutation feature
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    摘要:

    为提高中性点经消弧线圈接地系统故障选线的准确性,详细分析单相接地故障时故障线路与非故障线路相间电流分布特征。发现过渡电阻不大时故障线路相间电流在故障前、后变化量与非故障线路相间电流变化量差别较大,但在高阻接地故障时差别不明显;故障后主动调整消弧线圈补偿度,发现高阻接地故障时故障线路相间暂态电流突变量等于零序电感电流变化量,特征表现明显。为此,提出综合利用故障发生与补偿度调整后的相间电流突变特征的无整定故障选线方法,并借助欧式距离定义各线路故障特征距离,故障线路表征出最大值。大量仿真结果表明,所提新判据具有免整定、耐高过渡电阻和小故障角故障等优点。

    Abstract:

    In order to improve the accuracy of faulty feeder selection when the single-phase-grounding fault occurs in a resonant earthed system, the distribution features of phase-to-phase current in both faulty lines and non-faulty lines are analyzed in detail. It is found that in a small fault resistance rather than a high fault resistance, there is a significant difference between the variation of phase-to-phase current in faulty feeder and non-faulty feeder. If the compensation degree of arc-suppression coil is adjusted after the occurrence of the fault, the mutation of phase-to-phase transient current would be equal to the change of zero-sequence inductor current, which is more overt in the case of high impedance grounding faults. Therefore, a non-setting faulty line selection method is proposed, which integrates the mutation features of phase-to-phase current mutation in each line with compensation adjustment after the fault. The fault feature distance can also be defined by Euclidean distance so that the line with maximum value can be distinguished as the faulty line. Simulation results show that the proposed criteria requires no setting, and can fit in the scenarios with high transition resistance orsmall inception angle fault.

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陈桥山,王媛媛,方涛,韦根,黄跃.基于相间电流突变特征的可调消弧线圈接地系统选线方法[J].电力科学与技术学报,2022,(2):47-53. CHEN Qiaoshan, WANG Yuanyuan, FANG Tao, WEI Gen, HUANG Yue. A faulty feeder selection method for adjustable arc-suppression coil system based on phase-to-phase current mutation feature[J]. Journal of Electric Power Science and Technology,2022,(2):47-53.

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  • 在线发布日期: 2022-05-26
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