基于脉冲差分的单芯电缆护层接地诊断
Grounding Diagnosis of Single-core Cable Sheath Based on Pulse Difference
李根 1祁建怀1
作者信息
- 1. 国网安徽省电力有限公司芜湖供电公司,安徽 芜湖 241000
- 折叠
摘要
高压单芯电缆护套绝缘的完整性对于保证电缆的设计容量、运行安全和提高电缆的使用寿命具有重要作用.电缆护套绝缘在线监测与定位有利于及时发现电缆早期故障,避免绝缘进一步恶化,保证供电系统的可靠性.通过检测电缆护套的环流来判断多点接地故障的存在,并采用脉冲反射法对故障点进行定位.为了解决电缆中间接头反射引起的故障反射波形混淆问题,提出了一种基于脉冲差分法的电缆护套接地故障测距方法.在ATP-EMTP中建立了变频电缆模型,验证了该方法能快速、准确地测量电缆护套接地故障距离.
Abstract
The integrity of sheath insulation of high voltage single-core cable plays an important role in ensuring the design capacity,safe operation and increasing the service life of cable.The on-line monitoring and location of ca-ble sheath insulation is helpful to find the early faults of cable in time,avoid the deterioration of insulation and en-sure the reliability of power supply system.In this paper,the existence of multi-point earthing fault is judged by de-tecting the circulating current of cable sheath,and the pulse reflection method is used to locate the fault point.In or-der to solve the problem of confusion of fault reflection waveform caused by reflection of cable intermediate joint,a method of fault location for cable sheath grounding based on pulse difference method is proposed.The frequency conversion cable model is built in ATP-EMTP,and it is proved that the method can measure the grounding fault dis-tance of cable sheath quickly and accurately.
关键词
单芯电缆/护层接地/脉冲差分/在线监测Key words
single core cable/protective layer grounding/pulse difference/online monitoring引用本文复制引用
出版年
2024
NETL
NSTL
万方数据