| 引用本文: | 邵文权,刘一璇,关 欣,焦 卓.一种主动探测式的配电网相间重合前永久性故障判别方案[J].电力系统保护与控制,2021,49(14):96-103.[点击复制] |
| SHAO Wenquan,LIU Yixuan,GUAN Xin,JIAO Zhuo.An active detection scheme for permanent fault identification before phase-to-phase reclosing in a distribution network[J].Power System Protection and Control,2021,49(14):96-103[点击复制] |
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| 摘要: |
| 针对配电线路相间故障后采用自动重合闸存在重合于永久故障的问题，提出一种采用附加电容的主动探测式配电网相间重合前永久性故障判别方案。通过预充电的附加电容多次定时限投切到跳闸后相间回路，利用三个相间回路放电电流衰减特性进行故障回路状态鉴别。任一回路放电电流衰减特性与其他回路放电电流衰减特性存在较大差异时，则该相间回路存在故障。附加电容多次投切到该故障回路，判别周期内放电电流衰减特性高度一致则认为是相间永久性故障。依据前述相间回路放电电流衰减特性的差异，建立了永久故障识别判据及实现方案。PSCAD的仿真验证表明，所提方案能够在不同故障位置、不同过渡电阻情况下准确地识别线路相间永久故障，有助于避免配电网相间故障重合闸动作的盲目性。 |
| 关键词: 配电网 相间故障 附加电容 永久性故障 自适应重合闸 |
| DOI：DOI: 10.19783/j.cnki.pspc.201139 |
| 投稿时间：2020-09-16修订日期：2020-10-29 |
| 基金项目:陕西省重点研发计划资助(2020GY-167)；西安市科技计划项目资助(2019-GXYD7.4) |
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| An active detection scheme for permanent fault identification before phase-to-phase reclosing in a distribution network |
| SHAO Wenquan,LIU Yixuan,GUAN Xin,JIAO Zhuo |
| (School of Electronics and Information, Xi'an Polytechnic University, Xi'an 710048, China) |
| Abstract: |
| Traditional auto-reclosing may reclose to the permanent fault after a phase-to-phase fault occurs in the distribution line. Thus an active detection scheme for identifying the permanent fault of a distribution network before phase-to-phase reclosing, with additional capacitance, is proposed. The pre-charged additional capacitor is switched to the phase to phase circuit after tripping for several times, and the fault circuit state is identified using the discharge current attenuation characteristics of three phase-to-phase circuits. When the discharge current attenuation characteristics of any circuit are significantly different from those of other circuits, there is a fault in the phase-to-phase circuit. If the discharge current attenuation characteristics of the circuit are highly consistent in the discrimination period, the phase-to-phase fault is considered as a permanent fault. According to the difference of discharge current attenuation characteristics between phase-to-phase circuits, a permanent fault identification criterion and its implementation scheme are established. The simulation results based on PSCAD show that the proposed scheme can accurately identify a permanent phase-to-phase fault in different fault locations and with different transition resistances. This is helpful in avoiding the blindness of reclosing action of a phase-to-phase fault in a distribution network.
This work is supported by the Key Research and Development Project of Shaanxi Province (No. 2020GY-167) and Xi’an Science and Technology Project (No. 2019-GXYD7.4). |
| Key words: distribution network phase-to-phase fault additional capacitance permanent fault adaptive reclosure |
