电力系统保护与控制2024，Vol.52Issue(23)：65-73,9.DOI:10.19783/j.cnki.pspc.240107
计及相位偏移的小电阻接地系统电压梯度测距方法
Voltage gradient location method for a small resistance grounding system considering phase offset
摘要
Abstract
There is a problem of the low reliability of power supply due to direct tripping of protection after a single-phase grounding fault in a small resistance grounding system.Thus a voltage gradient location method taking into account the phase offset is proposed.First,using the zero sequence current flow loop of a single-phase grounding fault in small resistance grounding system,the zero sequence voltage amplitude distribution characteristics are analyzed when the zero sequence voltage phase offset is ignored and when the zero sequence voltage phase offset is taken into account.Secondly,for the case when the zero sequence voltage phase offset cannot be ignored,the distribution characteristics of the relative amount of zero sequence voltage at any point of the fault line is analyzed by taking the zero sequence voltage at the exit of the bus as the reference.Finally,on the basis of accurately obtaining the sector location results,a location method based on the gradient of the relative amount of zero sequence voltage is proposed.Simulation results show that,for overhead lines with typical parameters,compared with the traditional location method based on zero sequence voltage amplitude gradient,the ranging accuracy is significantly improved by using the gradient of the relative amount of zero sequence voltage.关键词
小电阻接地系统/故障测距/电压分布特征/零序电压相位偏移/相对量Key words
small resistance grounding system/fault location/voltage distribution characteristics/zero sequence voltage phase offset/relative amount引用本文复制引用
俞小勇,李克文,吴丽芳,张碧芸..计及相位偏移的小电阻接地系统电压梯度测距方法[J].电力系统保护与控制,2024,52(23):65-73,9.基金项目
This work is supported by the Science and Technology Project of China Southern Power Grid(No.GXKJXM20222183). 南方电网公司科技项目资助(GXKJXM20222183) （No.GXKJXM20222183）
