Sheath current in HV cable systems and its on-line monitoring for cable fault diagnosis

被引：0
|
作者：
Yuan, Yanling [1 ]
Zhou, Hao [2 ]
Dong, Jie [1 ]
Shi, Xiaochuan [2 ]
Mu, Yong [1 ]
Tang, Zeyang [3 ]
Zhou, Chengke [3 ]
机构：
[1] Tangshan Power Supply Company, State Grid Jibei Electric Power Co. Ltd., Tangshan
[2] Beijing Fujiaanda Electrical Technology Co. Ltd., Beijing
[3] School of Electrical Engineering, Wuhan University, Wuhan
来源：
Gaodianya Jishu/High Voltage Engineering | 2015年 / 41卷 / 04期
关键词：
Condition monitoring; Fault analysis; Fault diagnosis; High voltage power cable; Sheath current; Simulation;
D O I：
10.13336/j.1003-6520.hve.2015.04.017
中图分类号：
学科分类号：
摘要：
Cable sheath currents can be utilized to identify cable faults at an early stage and avoid unplanned power outages. We put forward a methodology to analyze the sheath currents in three-phase cross-bonded cable system with cable link boxes under either normal or fault conditions. Firstly, we established a numerical model to analyze two selected joint faults in detail. Then, on the basis of the calculation of a 1.5 km long 110 kV underground power cable system installed in a cable tunnel, we proposed a set of criteria for the fault diagnosis and localization of 12 kinds of faults that could significantly cause changes in sheath currents. The simulation results indicate that the sheath current decreases when the open-circuit fault occurs in the cable sheath loop, however, in the case of flooded cable link box or insulation breakdown between sheaths at both sides of a cable joint, the sheath current gets higher than its normal. According to the criteria, it is able to determine and locate three kinds of cable faults, namely, sheath open circuit induced by loosen joints, flooded cable link box, and prefabricated epoxy component breakdown in joints, though the criteria may vary due to large changes in earth resistance. ©, 2015, Science Press. All right reserved.
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页码：1194 / 1203
页数：9
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