Automatic power on and off system for overhead lines

Abstract

The invention relates to mining electrical equipment, in particular to an automatic overhead line powering-on and powering-off system. An electric locomotive is connected with an overhead line through a bow collector, the overhead line comprises a power transmission line and a ground lead, the power transmission line is provided with a control module, a normally-closed contact of a relay I and the primary side of a current transformer are connected on the power transmission line in series, one end of the secondary side of the current transformer is grounded, the other end of the secondary side of the current transformer is connected into a PLC control chip, the two voltage output ends of the PLC control chip are connected with a coil of the relay I and a coil of a relay II respectively in parallel, the power transmission line is connected into a constant current source, the constant current source is connected with the electric locomotive through the bow collector, the two ends of the bow collector are connected with a voltage transducer in parallel, the voltage transducer is connected with a normally-opened contact of the relay II and the PLC control chip in series and in sequence, an electric locomotive starting switch is a single-pole double-throw switch, one side of the starting switch is connected with an electricity using line of the electric locomotive in series, and the other side of the starting switch is connected with an inductor in series. The automatic overhead line powering-on and powering-off system is convenient to use, the overhead line can be powered on or powered off automatically according to the running state of the electric locomotive, and potential safety hazards are eliminated.

Description

technical field [0001] The invention relates to a mine electrical equipment, in particular to an automatic power on and off system for an overhead line. Background technique [0002] Mining electric locomotives are mainly used for long-distance transportation in underground transportation lanes and on the ground, and are suitable for commonly used mining equipment. The electric locomotive needs to rely on the overhead line to supply power to it during operation. However, the height of the overhead line in the general mining area is relatively low. The overhead lines passing by usually use segmented power supply, and only supply power in the overhead line section where the electric locomotive runs. But when the electric locomotive stops under the overhead line, it will still think that there is an electric locomotive running in the section of the overhead line, and supply power to it, so there is a risk of electric shock for the operators who are active in this area. Conte...

AI Technical Summary

Problems solved by technology

The electric locomotive needs to rely on the overhead line to supply power to it during operation. However, the height of the overhead line in the general mining area is relatively low. The overhead lines passing by usually use segmented power supply, and only supply power in the overhead line section where the electric locomotive runs

But when the electric locomotive stops under the overhead line, it will still think that there is an electric locomotive running in the section of the overhead line and supply power to it, so there is a danger of electric shock to the operators who are active in this area

Images