长距离500kV电缆线路交接试验研究及应用

Study on the Hand-Over Test and Application of 500 kV Power Cable Lines with Long Distance

从工程实际实施的角度出发,对国内外现有耐压试验标准进行了对比分析,综合考虑检测效果、理论研究成果、试验设备能力、工程实际情况和社会经济效益等多方面因素,提出了采用混联方式实现长距离500 k V电缆线路工程变频耐压试验的检测方法,同时,提出了变频谐振耐压过程中同步开展分布式局部放电检测的方法,可满足500 k V长距离交联电缆线路耐压过程中的局部放电分布式同步检测。在北京海淀500 k V电缆工程中,实施完成了世界上首次1.7 U_0/60 min条件下500 k V长距离交联电缆线路变频谐振耐压与分布式局部放电同步检测的现场试验应用,有效地支撑了海淀500 k V电缆线路的交接试验。

In this paper,from the perspective of practical engineering,the comparison and analysis on the existing withstand voltage test standards at home and abroad are discussed.Considering combination of factors including testing perfor-mance,theory research results,the capability of test facilities,actual conditions of the project,social and economic benefits,the hybrid mode of variable frequency withstand voltage facilities is adopted to realize the completion test of the long distance 500 kV cable lines. Meanwhile,the distributed partial discharge synchronous detection method is proposed to achieve partial discharge detection in the process of variable frequency resonance withstand voltage test for 500 kV XLPE cable lines of long distance. In the 500 kV cable project of Haidian Beijing,the author implemented the variable frequency resonance withstanding voltage test with distributed partial discharge synchronous detection under the conditions of 1.7 U_0/60 min for500 kV XLPE cable lines with long distance for the first time in the world to have good effects.