电力系统自动化2016，Vol.40Issue(24)：137-145,9.DOI:10.7500/AEPS20151209007
小电流接地故障暂态过程的LC谐振机理
LC Resonance Mechanism of Transient Process of Earth Fault in Non-solidly Earthed Network
摘要
Abstract
Traditional transient mechanism based on the charging and discharging of distributed capacitance to earth for single-phase earth faults in non-solidly earthed networks has not yet been analyzed and validated strictly in theory or field.The traditional mechanism only partly reflects the resonance of transient processes and therefore is not accurate or comprehensive enough.A transient mechanism based on LC resonance for single-phase earth fault in non-solidly earthed networks is proposed. Based on the established single-phase earth fault model using distribution line parameters the impedance characteristics of the frequency-dependency between different modes and different lines in the same mode the impedance characteristic will alternately appear to be capacitive and inductive are analyzed.The LC series parallel resonance conditions and the energy exchange law between capacitive lines and inductive lines are given.A study has found that the transient process of single-phase earth fault can be produced by LC series or parallel resonance in single line different lines in the same mode as well as LC series resonance between different modes.The transient current produced by the main resonance smallest resonance frequency in all the LC series parallel resonance contains clear fault location information.关键词
小电流接地系统/单相接地故障/暂态/谐振机理Key words
non-solidly earthed network/single-phase earth fault/transient/resonance mechanism引用本文复制引用
薛永端,薛文君,李娟,徐丙垠..小电流接地故障暂态过程的LC谐振机理[J].电力系统自动化,2016,40(24):137-145,9.基金项目
国家自然科学基金资助项目(51477184) （51477184）
国家高技术研究发展计划(863计划)资助项目(2012AA050212).This work is supported by National Natural Science Foundation of China No.51477184 and National High Technology Research and Development Program of China 863 Program No.2012AA050212 （863计划）
