Practical Differential Protection for Half-wavelength Transmission Line

ZHAO Qingchun; XIE Hua; LU Jinfeng; ZHU Xiaotong

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Practical Differential Protection for Half-wavelength Transmission Line

更新时间：2025-12-08

- Practical Differential Protection for Half-wavelength Transmission Line
- Vol. 44, Issue 1, Pages: 44-50(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：
  CLC：
- Published Online：31 January 2018，
  
  Published：2018
- 稿件说明：
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ZHAO Qingchun, XIE Hua, LU Jinfeng, et al. Practical Differential Protection for Half-wavelength Transmission Line[J]. 2018, 44(1): 44-50.
DOI：

ZHAO Qingchun, XIE Hua, LU Jinfeng, et al. Practical Differential Protection for Half-wavelength Transmission Line[J]. 2018, 44(1): 44-50. DOI：

摘要

半波长输电线路电气特征的时空特性导致传统基于集中参数的纵联差动保护无法应用于半波长输电线路。为此

提出了一种实用的基于波动方程的半波长输电线路纵联差动保护。通过特殊的同步点数据选择

提升了动作速度

构建制动电流

提升区外故障安全性

并通过设置2段相电流差保护和零序电流差动保护

提升了保护灵敏度。开发了基于该原理的纵联差动保护装置

并搭建了基于实时数字仿真系统的特高压半波长输电线路仿真模型。仿真结果表明

通过同步点数据选择能提升保护速动性

设置的制动电流能提高区外故障安全性

设置的2段差动保护和零序差动保护能提升保护灵敏性。

Abstract

The traditional differential protection based on lumped parameter can not be applied to half wavelength transmission lines due to the spatial and temporal electrical characteristics of half wavelength transmission line.Consequently

we proposed a method of practical differential protection based on wave equation for half wavelength transmission lines.Through the selection of the special data synchronization point

we improved the the speed

reliability and sensitivity of the protection by constructing the restraint current and setting up two-section phase current differential protections and one section zero sequence current differential protection.Based on this principle

a differential protection device was developed.A simulation model of UHV transmission line based on RTDS was established to verify this device.The simulation results indicate that the synchronous data selection

the restraint current

and two-section phase current differential protections and one section zero sequence current differential can improve the speed

reliability and sensitivity of the protection device.

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