电力系统保护与控制2024，Vol.52Issue(4)：67-76,10.DOI:10.19783/j.cnki.pspc.230831
并阻尼谐振接地系统对地参数测量与高阻故障选线新方法
A new method for measuring ground parameters and selecting high resistance fault lines in parallel damping resonant grounding systems
摘要
Abstract
There are problems of inaccurate measurement of ground parameters and difficulty in selecting high resistance grounding fault lines in resonant grounding systems.Thus this paper proposes a new method for measuring ground parameters and selecting high resistance fault lines in parallel damping resonant grounding systems.Based on the switching characteristics of parallel damping resistance of an arc suppression coil,the system's ground conductance and capacitance parameters are measured by using the relationship between the zero-sequence voltage amplitude and phase change before and after switching the damping resistor.During normal operation of the system,the zero sequence admittance value of each feeder line is measured by adjusting the parallel damping resistance value.After a ground fault occurs,the damping resistance is exited and the zero sequence admittance value of each feeder after the fault is measured.This can eliminate the influence of system parameter asymmetry and asynchronous transformer sampling,actively construct the zero sequence admittance phase difference of each feeder before and after the fault,and achieve accurate identification of the faulty line.The proposed method is validated in the PSCAD simulation environment,and the results show that it can accurately measure the ground conductivity and capacitance parameters,with a relative measurement error of no more than 0.6％;when grounding faults occur in different feeders and transition resistors,the fault line can be accurately identified,and the resistance to transition resistance can reach 10 kΩ.关键词
阻尼电阻/谐振接地系统/对地参数测量/高阻故障/故障选线Key words
damping resistance/resonant grounding system/measurement of ground parameters/high resistance fault/fault line selection引用本文复制引用
曾超,喻锟,曾祥君,李理,贺世庚,贺芳煜..并阻尼谐振接地系统对地参数测量与高阻故障选线新方法[J].电力系统保护与控制,2024,52(4):67-76,10.基金项目
This work is supported by the National Natural Science Foundation of China(No.52037001 and No.52177070). 国家自然科学基金项目资助(52037001,52177070) （No.52037001 and No.52177070）
湖南省教育厅项目资助(22A0231) （22A0231）
