降低青藏铁路格拉段变电站接地电阻方法的探讨  

The Methods to Reduce Grounding Resistance in Qinghai-Tibetan Railway Ge-La Segment

作　　者：王颢[1] 付龙海[2] 吴广宁[2] 李晋[1] 

机构地区：[1]铁道第一勘察设计院电化处,甘肃兰州730070 [2]西南交通大学电气工程学院,四川成都610031

出　　处：《电瓷避雷器》2006年第1期42-46,共5页Insulators and Surge Arresters

基　　金：铁道部科技开发项目(2001J005-2);铁道部科技研究开发计划课题(2003J008-C)

摘　　要：青藏铁路格拉段经过青藏高原多年冻土地区,其地理条件较为特殊,目前,国内外在该地区变电站接地系统设计和工程经验等方面尚属空白。指出高纬度、高海拔、低气温是青藏铁路格拉段形成多年冻土的重要原因,冻土上限深度平均在1.5m～4m。提出可采用自然接地体,降低接地电阻要求,有利的地理条件和物理降阻剂等方式降低该地区变电站接地系统的接地电阻,为青藏铁路变电站接地系统的设计和实施提供了参考。Qinghai-Tibet railway passes through the perennial frozen sediment soil area of Qinghai-Tibetan Plateau. This area has its particular geography circumstance, which has huge influence on design and realization of substation grounding systems. Neither China nor other foreign countries has such research and engineering experiences. In this paper the formation of frozen sediment soil due to high latitude, high altitude and low atmosphere air temperature , the distribution of frozen soil upper limit of 1.5 m-4 m in average are introduced. The grounding systems of substations in the perennial frozen sediment soil area of Qinghai-Tibetan Plateau are analyzed. Some available methods to reduce grounding resistance such as utilizing natural grounding body, reducing requirement for grounding resistance, utilizing favorable geographical condition and physical resistance-reducing agent are recommended.

关 键 词：青藏铁路 冻土 土壤电阻率 接地电阻 

分 类 号：TM862[电气工程—高电压与绝缘技术]