降低青藏铁路格拉段变电站接地电阻方法的探讨

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。

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

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.