Circuit test system and circuit test and protection method for direct-current traction power supply feeder unit

Abstract

The invention relates to a circuit test system and a circuit test and protection method for a direct-current (DC) traction power supply feeder unit, which are used for a city rail transit DC traction power supply system. The system comprises a quick circuit breaker Q00 and a microcomputer measurement and control protection device, wherein the quick circuit breaker Q00 is connected between a power supply network bus and a feeder and used for supplying power to a contact network or a contact rail; a circuit test contactor K05 is connected in parallel with the quick circuit breaker Q00 and connected in series with a circuit test resistor R05; and the microcomputer measurement and control protection device can receive and process bus voltage signals and feeder voltage signals from the bus side and the feeder side of the quick circuit breaker Q00. The system and the method have the advantages of simple circuit structure, high detection accuracy and low influence on equipment of a power supply network.

Description

technical field [0001] The invention relates to a DC traction power supply feeder unit line testing system and a line testing and protection method used in an urban rail transit DC traction power supply system. Background technique [0002] In rail transit power supply systems, line faults and large currents generated when vehicles start and stop are always important factors that threaten safe operation. Preventing the DC fast circuit breaker from closing directly on the fault circuit is an important factor to ensure safe operation. Therefore, the line test of the DC traction power supply feeder unit has a wide range of applications in the DC traction power supply system. [0003] The implementation schemes of DC traction power supply feeder unit line testing in the prior art are roughly divided into two categories: 1. small current line testing, and 2. high current testing. [0004] The small current line test can reduce the impact on the traction power supply network to a...

AI Technical Summary

Problems solved by technology

[0004] The small current line test can reduce the impact on the traction power supply network to a certain extent, but it is susceptible to external interference; the high current line test has high accuracy, but the corresponding line test current-limiting resistor generates a lot of heat, which affects the reliability of the equipment

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