特殊工况下基于三角形计算的高精度输电线路单端测距方法
High Precision Single-ended Fault Location Method for Transmission Lines Based on Triangle Calculation in Special Wording Conditions
冯畅 1李峰 1宋爽 2陆帅 1王可1
作者信息
- 1. 南京磐能电力科技股份有限公司,江苏 南京 210031
- 2. 国网江苏省电力公司电力科学研究院,江苏 南京 211103
- 折叠
摘要
准确的故障测距是输电线路故障后快速恢复供电的重要前提.一般来说,线路上发生单相接地故障时,因过渡电阻的影响,导致计算阻抗无法正确反映保护安装处至故障点的线路阻抗值,必须借助双端测距才可获得精确测距值.文中在分析附加阻抗来源的基础上,提出在特殊的工况下,双端测距失效,基于三角形计算的单端测距可精确测距,并且此方法可以推广至架空线、地缆混合参数的输电线路故障.经过仿真数据以及现场数据验证,该方法具有较高的精度.
Abstract
Precise fault location is an important precondition of quick power supply restoration after transmission line fault occurs.In generally, concerning one-phase to ground fault, it is the transient resistance that causes that the impedance from where the relay is installed to where the fault occurs is caculated incorrectly.On such scenario, a double-ended fault location algorithm is preferred in order to acquire rather precise fault location result.Based on analyzing the source of additive impedance, this essay presents that under some special working conditions whereas double-ended fault location becomes invalid, single-ended fault calculation based on solving triangle calculation gives precise results.And this method can also be applied to hybrid parameter transmission lines which have both overhead lines and cables.The simulation and field data verified that the method has high precision.
关键词
单端测距/双端测距/阻抗计算/混合参数输电线路/T接线Key words
single-ended fault location/double-ended fault location/impedance calculation/hybrid parameter transmission line/T type connection引用本文复制引用
出版年
2017
国家科技期刊平台
NSTL
维普
万方数据