Line test device and test method of direct-current traction power supply switch cabinet

Abstract

The invention belongs to a detection technique of electric equipment, which relates to the detection of a direct-current switch cabinet supplying power to an urban rail traffic direct-current traction engine, in particular to a line test device and a test method of a direct-current traction power supply switch cabinet. The line test device and the test method are characterized in that a detection line is respectively led out from the main bus-bar side and the feeder line side of a direct-current breaker in the line, wherein the detection line which is led out from the feeder line side is connected to the cathode of a bus bar by an adjustable resistor A651, and the detection line which is led out from the main bus-bar side is connected to the cathode of the bus bar by an adjustable resistor R653, a contactor K and the adjustable resistor A651 sequentially; and a voltage amplification signal is output to a protection device through signals which are led out from both ends of the adjustable resistor A651 by a measuring amplifier. When a direct-current traction power supply system carries out the normal breaker switching-on operation, the invention can test the line for many times, closes the contactor K when required for carrying out further judgment, enhances the accuracy of a test result, ensures the reliable operation of the direct-current traction power supply switch cabinet and has convenient and accurate test process.

Description

technical field [0001] The invention belongs to the detection technology of electrical equipment, and relates to the detection of a DC switchgear for the power supply of an urban rail transit DC traction locomotive, in particular to a circuit testing device and a testing method for a DC traction power supply switchgear. Background technique [0002] In the electrical system of urban rail transit, line faults and large currents generated when vehicles start and stop are always important factors that threaten safe operation. Therefore, preventing the DC fast circuit breaker from directly closing on the fault circuit is an urgent requirement to ensure the safe operation of the equipment, but there is no ideal equipment in the prior art that can meet this requirement. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a line testing device and testing method for the DC traction power supply switchgear that can monitor a...

AI Technical Summary

Problems solved by technology

Therefore, it is an urgent requirement to ensure the safe operation of the equipment to prevent the direct closing of the DC fast circuit breaker on the fault circuit, and there is no ideal equipment in the prior art that can meet this requirement.

Images