The examination and repair must be conducted by professional wireman .

检修必须由专业 电工进行。

Petroleum machinery factory have two solutions one is high voltage power supply connected to large power transformers but it need professional wireman to reconnect after moving and it need to stop providing electricity .

现 各石油机械厂的解决方案大体为两种：一、在 井场电源高压 端接大功率变压器，每次搬家后都需专业高压 电工重新连接，且需高压端断电连接。