放热焊技术在菲律宾电网接地施工中的应用

Application of the Exothermic Welding Technology in Substation Grounding Constructions of the Philippines Power Grid

菲律宾的气候特点是雨水多、空气和土壤湿度大,特殊的气候环境和潮湿土壤侵蚀,对接地网的安全、可靠、稳定运行,构成了极其严重威胁。为了确保电网安全运行,菲律宾国家电网规程要求所有变电站的接地网使用铜金属接地。铜绞线相比钢接地极,在耐蚀性、安全性和电气性等方面具有较大的优势。根据多年现场积累的施工工艺和操作经验,介绍了在菲律宾电网中采用接地放热焊接工艺的应用经验和建议,尤其是针对铜绞线含水以及溶接剖面要求彻底熔化等问题,提出了溶接时的操作要点和技术措施。

The Philippines climate characterized by rain,air and soil humidity. The special climate and moist soil erosion caused extremely serious threat to the grounding grid security, reliability, and stable operation. In order to ensure the safe operation of the power grids, the technical regulations of the NGCP （the National Grid Corporation of the Philippines） require all the substations grounding grid to use copper metal grounding system. Compared to the steel ground electrode, copper wire has a larger advantage in terms of corrosion resistance, security and electrical. Accumulation based on years of on-site construction technology and operating experience, and this article introduces the experience and recommendations of the grid grounding exothermic welding process applications in NGCP. Especially for the copper stranded aquifer and welding section requires thorough melting and other issues, this article give the proposed welding operating points and technical measures.