1·How to discover the dangerous slight crack in early stage in labor pillar insulator and porcelain cover, is a problem of the overhaul in step-up station and substation.
如何早期发现在役支柱绝缘子及瓷套中存在的危及安全运行的裂纹，一直是升压站和变电站检修的难题。
2·Electric power step-up substation is the important corollary engineering of Baise hydropower station.
百色水利枢纽升压站是电站工程的重要配套工程。
3·A step-up transmission substation receives electric power from a nearby generating facility and uses a large power transformer to increase the voltage for transmission to distant locations.
译文为：升压变电站从附近的发电设施接收电力，然后使用大型变压器将电压升高，远距离输送电力。