电力系统保护与控制2025，Vol.53Issue(13)：47-58,12.DOI:10.19783/j.cnki.pspc.241222
基于护层接地线电流和分段TKEO的电缆早期故障检测方法
Early fault detection method for cables based on sheath grounding current and segmented TKEO
摘要
Abstract
Early faults in cables are characterized by short-duration discharges and weak fault signatures,making them difficult to trigger conventional overcurrent protection and complicating fault detection.If not detected and addressed in time,such faults can gradually deteriorate into permanent failures.To address the challenge of sensitively and reliably detecting early-stage cable faults that are prone to occurring in medium-voltage distribution networks,this paper proposes a cable early fault detection method based on the sheath grounding wire current and the segmented Teager-Kaiser energy operator(TKEO).First,optimal variational mode decomposition(OVMD)is applied to decompose the sheath grounding wire current signal.The optimal decomposition number is determined using the central frequency method,yielding a set of intrinsic mode function(IMF).Then,the pulse factor and cosine similarity of each mode are calculated,and the mode component with the most pronounced fault characteristics is selected.Next,the energy variation characteristics of the signal are analyzed using the derivative of the segmented TKEO.Finally,the ratio of the maximum derivative value of each TKEO segment to that of the previous segment is calculated,and a suitable threshold is set for fault detection.Simulation results demonstrate that this method can accurately detect cable conditions,enabling early fault detection and ensuring both sensitivity and reliability in detection.关键词
早期故障/分段Teager-Kaiser能量算子/脉冲因子/余弦相似度Key words
early fault/segmented Teager-Kaiser energy operator/pulse factor/cosine similarity引用本文复制引用
王晓卫,魏春燕,王毅钊,张志华..基于护层接地线电流和分段TKEO的电缆早期故障检测方法[J].电力系统保护与控制,2025,53(13):47-58,12.基金项目
This work is supported by the National Natural Science Foundation of China(No.52177114 and No.61403127). 国家自然科学基金项目资助(52177114,61403127) （No.52177114 and No.61403127）
国网陕西省电力有限公司科技项目资助(5226KY23001U) （5226KY23001U）
