Method and device for detecting DC cross-channeling in dual DC power supply system

Abstract

The invention relates to a method and device for detecting direct current crossing in double direct-current power source systems. The method includes the following steps that: S1, balance bridge insulation grounding switches of the doubles direct current power source systems are switched off; S2, positive and negative voltage-to-earth signals of the two direct current power source systems in a first switching resistance state are detected; S3, positive and negative voltage-to-earth signals of the two direct current power source systems in a second switching resistance state are detected; and S4, the type of direct current crossing in the double direct-current power source systems is judged based on the positive and negative voltage-to-earth signals in the above two states. With the method and device for detecting the direct current crossing in the double direct-current power source systems of the invention adopted, bus direct current crossing in the double direct-current power source systems can be effectively detected, and the type of the bus direct current crossing can be accurately determined.

Description

technical field [0001] The invention relates to the field of DC power supply systems, and more specifically, to a method and device for detecting DC cross-channeling in a dual DC power supply system. Background technique [0002] In the dual DC power supply system, the DC power supply is used as the main control and protection circuit power supply. Due to the large number of cable branches and wiring outlets, DC crossing of the busbars often occurs due to miswiring, misconnection, and device performance degradation. In a dual DC power supply system, busbar DC crossover usually includes positive busbar-positive busbar mutual crossover, negative busbar-negative busbar mutual crossover, positive busbar-negative busbar mutual crossover and negative busbar-positive busbar mutual crossover. Figures 1a-1d In the dual DC power system, the positive bus-positive bus crossing, negative bus-negative bus crossing, positive bus-negative bus crossing and negative bus crossing in the first ...

AI Technical Summary

Problems solved by technology

In the dual DC power supply system, the DC cross-channeling of the busbars of the first DC power supply system and the second DC power supply system will cause serious problems such as insulation performance degradation, deviation of insulation detection resistance, and abnormal fluctuation of busbar voltage.

However, there is no method and device in the prior art that can detect the DC cross-channeling of the bus in the dual DC power supply system

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