Scheme of Fault Phase Selection in Half-wavelength AC Transmission Line Based on Two-terminal Electrical Quantities

LU Jinfeng; ZHAO Qingchun; XIE Hua; ZHU Xiaotong

doi:10.13296/j.1001-1609.hva.2018.12.038

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Scheme of Fault Phase Selection in Half-wavelength AC Transmission Line Based on Two-terminal Electrical Quantities

更新时间：2025-04-26

- Scheme of Fault Phase Selection in Half-wavelength AC Transmission Line Based on Two-terminal Electrical Quantities
- High VoltageApparatus Vol. 54, Issue 12, Pages: 251-256(2018)
- 作者机构：
  
  南京南瑞继保电气有限公司
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2018.12.038
  CLC： TM75
- Published：2018
- 稿件说明：
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[1]陆金凤,赵青春,谢华,朱晓彤.基于双端量的半波长交流输电线路故障选相方法[J].高压电器,2018,54(12):251-256.

LU Jinfeng, ZHAO Qingchun, XIE Hua, et al. Scheme of Fault Phase Selection in Half-wavelength AC Transmission Line Based on Two-terminal Electrical Quantities[J]. High voltageapparatus, 2018, 54(12): 251-256.
[1]陆金凤,赵青春,谢华,朱晓彤.基于双端量的半波长交流输电线路故障选相方法[J].高压电器,2018,54(12):251-256. DOI： 10.13296/j.1001-1609.hva.2018.12.038.

LU Jinfeng, ZHAO Qingchun, XIE Hua, et al. Scheme of Fault Phase Selection in Half-wavelength AC Transmission Line Based on Two-terminal Electrical Quantities[J]. High voltageapparatus, 2018, 54(12): 251-256. DOI： 10.13296/j.1001-1609.hva.2018.12.038.

摘要

半波长交流输电线路电压等级高

故障后需要选相跳闸。但是半波长输电线路独特的电气特征使得传统的故障选相方法不再适用。文中提出了一种基于双端电气量的半波长交流输电线路故障选相方法。将两端相间电压、相间电流进行组合变换

换算到短路点正负序短路电流

从而判断故障相。基于电磁暂态仿真软件PSCAD搭建特高压半波长输电线路仿真模型。仿真结果表明

该故障选相方法不受故障位置、过渡电阻、弱馈等因素的影响

在半波长交流输电线路发生短路故障时

能快速正确地实现故障选相。

Abstract

Half-wavelength AC transmission line（HWACT）is a high-voltage transmission line.So

it needs to correctly choose the fault phases after short circuit occurred in HWACT.Due to its unique electrical characteristics

the traditional phase selection element no longer applies.This paper proposes a scheme of fault phase selection in HWACT based on two-terminal electrical quantities.Two-terminal line voltage and two-terminal line current can be converted into positive and negative sequence of short circuit current

and then it can correctly choose the fault phases.The fault phase selection scheme is not affected by fault location

fault resistance and weak-infeed line.PSCAD simulation shows that the scheme can select the fault phase selection quickly and correctly.

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