Auxiliary device for EMU differential flow monitoring test

Abstract

An auxiliary device for differential current monitoring and testing of multiple train sets relates to the electric debugging technical field of multiple train sets, and includes a current adjustment circuit, a control protection circuit, a display circuit and a current output interface circuit. The device of the present invention is equipped with multiple protections: the current adjustment circuit is electrically isolated from other circuits, and there is no risk of electric shock; the delay relay is used to automatically cut off the power after 0-20 seconds to prevent the operator from forgetting to cut off the power; an emergency power-off button is provided, Prevent misoperation from causing danger. The device uses a large LED screen to digitally display the voltage and current values, which is convenient for the operator to observe. The device cooperates with a high-precision three-terminal adjustable potentiometer and a fully isolated single-phase AC voltage regulating module. After setting the current value, the operator only needs to press the start and stop buttons to complete the output of a qualified current value that meets the test requirements. , easy to operate.

Description

technical field [0001] The invention relates to the technical field of electric debugging of multiple train sets, in particular to an auxiliary device for differential current monitoring and testing of multiple train sets. Background technique [0002] The differential current monitoring test is required for the EMU during the train debugging stage. The purpose of this test is to detect the current difference between the input current transformer and the grounding return current transformer. When the difference exceeds a certain value, according to the current difference of different CCU (Central Control Unit; Central Control Unit) disconnects the main circuit breaker through software triggering and hardware triggering, so as to realize the protection of the electrical components of the EMU. The content of the test is: the primary side of the transformer input current transformer 10-T04 with the main transformer car is wound with 2 turns and 10 turns of insulated wire respec...

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