浙江电力2025，Vol.44Issue(4)：84-92,9.DOI:10.19585/j.zjdl.202504009
基于零序电流相位变化量的灵活接地系统故障选线方法
A fault line selection method for flexible grounding systems based on zero-sequence current phase variation
摘要
Abstract
To address the poor tolerance to transitional resistance and incomplete utilization of fault information in grounding protection for flexible grounding systems,a fault line selection method based on current phase variation is proposed.First,the phase variation trends of zero-sequence currents across lines before and after small resistance insertion are analyzed based on the zero-sequence equivalent circuit of single-phase grounding faults in flexible grounding systems.Then,it is observed that during high resistance grounding faults,the phase variation of zero-sequence currents in healthy lines shows significant differences from that of the fault line.Based on this observation,a fault line selection method using zero-sequence current phase variation is proposed.Finally,the correctness and effectiveness of the proposed method are verified in PSCAD/EMTDC simulations.Results show that the method only requires phase information of zero-sequence currents before and after small resistance insertion,offering strong tran-sitional resistance tolerance and immunity to issues such as zero-sequence CT polarity reversal,asynchronous sam-pling,and fault distance variations.关键词
灵活接地系统/高阻接地故障/零序电流/相位变化量/故障选线Key words
flexible grounding system/high resistance grounding fault/zero-sequence current/phase variation/fault line selection引用本文复制引用
李宗,王德强,冯亮,宋建国,高委员,袁朋生..基于零序电流相位变化量的灵活接地系统故障选线方法[J].浙江电力,2025,44(4):84-92,9.基金项目
国家自然科学基金(52307155) （52307155）
