Working principle of overhead mine electric locomotives

The overhead mine electric locomotives uses the pantograph to obtain electrical energy from the circuit. When the mine electric locomotives is running, the pantograph slides along the overhead line. The power supply mode of the overhead mine electric locomotives is that the high-voltage cable drawn from the central substation supplies the three-phase AC power of the traction converter. DC. The positive pole of the DC power supply is connected to the overhead line conductor through the power supply cable, the contact point during the period becomes the power supply point, and the negative pole is connected to the track through the return cable, and the corresponding contact is called the return point. When working, the upper part of the electric locomotive running along the track relies on the pantograph to contact the overhead line to obtain electric energy, and the lower part uses the wheels to contact the track to form a loop to make the traction motor work, so that the mine electric locomotives can drive the mine car.

It can be seen that the running track of the overhead mine electric locomotives is also the wire of the current loop. In order to reduce the voltage drop of the traction grid, wires or copper sheets are generally used to connect the joints of the steel rails to reduce the resistance at the joints.