浅谈相控阵超声检测技术在苏通管廊铝合金外壳的应用
2021-03-28战丽丽
战丽丽

摘 要:苏通GIL综合管廊工程举世瞩目,迄今为止是世界上第一次在输电通道中采用特高压GIL进行输电的工程。苏通特高压GIL管廊工程具有显著的特点,如最先进的技术水平、最大的输送电容量、最高的电压等级、最长的输送距离等显著的特点,名副其实地被誉为“万里长江第一廊”。由此可见,GIL其中使用的零部件的技术和质量要求很严格,针对零部件之一的铝合金外壳的生产和检验,为更好地满足质量和交货期的要求,特采用了先进的相控阵超声检测技术。
关键词:苏通管廊 铝合金外壳 螺旋焊管 螺旋焊缝 相控阵超声检测技术
Abstract:So far, it is the first time that the super high voltage Gil is used in the power transmission channel in the world. Sutong UHV GIL pipeline corridor project has remarkable characteristics, such as the most advanced technology level, the largest transmission capacity, the highest voltage class, the longest transmission distance and so on, truly known as "the first corridor of the Yangtze River". It can be seen that the technical and quality requirements of the components used in Gil are very strict, aiming at the production and inspection of one of the components, the aluminum alloy shell, in order to better meet the quality and delivery requirements, the advanced phased array ultrasonic testing technology is specially used.
Key Words:Sutong pipe gallery; Aluminium alloy casing; Spiral welded pipe; Spiral weld; Phased array ultrasonic testing technology
GIL(Gas-insulated Metal Enclosed Transmission Line,气体绝缘金属封闭输电线路)是将金属导电杆封闭在金属外壳内,利用金属导电杆的方式进行输电,金属外壳接地,且内部通过充惰性气体至规定的压力从而进行绝缘。简言之,GIL就是具备封闭兼绝缘特性的输电线路。
GIL具有没有电或热的老化现象、传输电容量比普通电缆的大、运行不受外界环境的影响等优点,同时还具有运行可靠度高、安全性高、经济性好、节约用地面积等显著特点,所以GIL尤其适合作为架空输电方式和电缆送电存在受限情况时的补充输电技术等某些受限的场所和特定场所的使用。
连接苏州和南通两地的特高压苏通GIL综合管廊工程采用两回6相1 000 kV,管线6相总长约35 km,单相长度5.8 km,通过江底隧道穿越长江两岸,很大程度上解决并实现了华东特高压交流双环网合环有效顺利地运行。
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