Conventional RTG uses the diesel generator set provided by each crane for power supply. As the gantry crane is in the standby state for waiting operation about 60% of the time, the power required during these times is very small and only needs to maintain the operation of the control system and air conditioning, but the high-power diesel generator set still needs to run, resulting in a waste of resources and unreasonable emissions. Just use the power needed for standby. When the gantry crane puts down the container, the gravitational potential energy will be converted into renewable electric energy, and after the "oil to electricity" power network, the renewable electric energy can be supplied to other equipment in the dock, and sometimes there is surplus electric energy, which will be fed back to the local national grid. The "oil to electricity" transformation can effectively reduce operating costs and reduce environmental pollution. The content of the transformation is to add a mains power supply system device on the basis of the original RTG diesel generator set, so as to achieve the dual-purpose effect of electric driving as the main and diesel driving as the auxiliary. The main performance of the original RTG was maintained after the transformation.

The RTG coil "oil to electricity" system consists of the following main components:

On board:

1. cable reel system: Power cable reel using frequency conversion drive, single row spiral winding coil structure.

2. power on cable: the machine cable uses low-voltage round cable.

3. Add power switching control cabinet.

Ground part:

1. box change: according to the number of storage yard to determine the number and capacity of the box change.

2. Power supply cable: armored buried low-voltage cable.

3. the ground socket box: socket integration and control protection part integration.