摘要
积水环境下的中压电缆接头早期故障已严重影响配电网的可靠运行。对于现有研究中电缆接头早期故障识别方法的可解释性差问题,该文根据实际运行场景设计了积水环境下的电缆接头早期故障实验,得到早期故障场景构成与变化过程。据此将早期故障分为开始、主体两个阶段,并分析得到早期故障存在如电流幅值、持续时间、损伤累积、阶段间频谱差异等时域、频域特征。并在此基础上提出早期故障识别装置结构及配套的识别逻辑,识别逻辑包含计时阈值检测、连续性检测、谐波采样、谐波含量比较与重复性检测5步。最后基于实测故障数据进行了识别逻辑验证。验证结果表明,该文提出的识别逻辑可有效筛除其他干扰信号,有较高的准确率。
The incipient fault of medium-voltage cable joint in a water-logged environment has seriously affected the reliable operation of distribution network.In view of the poor interpretability of incipient fault identification methods of cable joints in current research,this paper designed incipient fault experiments of cable joints in water-logged environment according to actual operation scenarios,and obtains the composition and change process of incipient fault scenarios.Therefore,the incipient fault is divided into two stages,the beginning and the main stage,and the time domain and frequency domain characteristics such as current amplitude,duration time,damage accumulation,and spectrum difference between stages are analyzed.On this basis,the structure of incipient fault identification device and corresponding identification logic are proposed.The identification logic consists of five steps,namely,timing threshold detection,continuity detection,harmonic sampling,harmonic content comparison,and repetitive detection.Finally,the identification logic verification is carried out based on the data from the actual scenario.The verification results show that the proposed recognition logic can effectively screen out other interference signals and has a high accuracy.
作者
于志鹏
刘亚东
严英杰
江秀臣
王科
YU Zhipeng;LIU Yadong;YAN Yingjie;JIANG Xiuchen;WANG Ke(School of Electrical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Electric Power Research Institute of Yunnan Power Grid Co.,Ltd.,Kunming 650217,China)
出处
《高电压技术》
北大核心
2025年第9期4651-4662,共12页
High Voltage Engineering
关键词
积水环境
中压电缆接头
早期故障
特征分析
故障场景
识别装置
识别逻辑
water-logged environment
medium voltage cable joint
incipient fault
characteristic analysis
fault scenario
identification device
identification logic
