Research and practice of soft start technology for ESP transformer on offshore oil platform

Electric Submersible Pump（ESP） is an important production equipment of offshore oil platform,and it is the key to the formation of oilfield production.ESP is usually connected to 400 V power system through step-up transformer,which is the end of the power grid of the platform.As the offshore oil platform uses turbine generator as the power source,it has no electrical connection with the land power grid.It is a typical island power grid.The grid structure determines the small short circuit capacity of the system,especially the short-circuit current of the power supply terminal where the ESP is located is even less than the excitation magnetic inrush current,which has adverse effects on protection setting and equipment operation.Therefore,taking well A28 of a certain platform as an example,the causes of inrush current of ESP transformer are analyzed.Combined with the actual situation,the scheme of inrush current suppression is determined and good results are achieved.