摘要
高压电缆金属护套多点接地故障将导致护套环流值显著增大,从而加速电缆绝缘的老化,缩短电缆的使用寿命和输送能力,威胁电力系统的安全稳定运行。笔者对电缆护套环流进行了理论分析,建立电缆的Bergeron模型,利用电磁暂态程序对电缆护套多点接地时故障进行仿真,通过对接地线电流的分析,找出影响环流值大小的因素,以及环流与多点接地故障的相关性规律,为高压电缆护套绝缘的在线监测和故障诊断的判定提供参考。
The muhipoint grounding fault of high-voltage cable＇s metal sheath will cause that circulating current of metal sheath increases significantly, which can speed up the aging of the cable insulation, shorten the service life of cables, reduce the transmission capacity of cables and threaten the safety and stability of the power system. This paper analyses the circulating current of metal sheath in theory, sets up the Bergeron model of cables and makes use of the alternative transient program to simulate multipoint grounding faults in high-voltage cable＇s metal sheath of different connection modes. The grounding line current is analyzed to find the factors impact the circulating current and the correlation rule between the circulating insulation current and multipoint grounding faults, which can be used to provide reference for on-line monitoring of high-voltage cable＇s metal sheath and determination of fault diagnosis.
出处
《高压电器》
CAS
CSCD
北大核心
2014年第4期49-53,60,共6页
High Voltage Apparatus
关键词
高压电缆
金属护套
多点接地
环流
ATP仿真
high-voltage cable
metal sheath
muhipoint grounding
circulating current
ATP simulation
