A grid-side circuit control method and device based on EMU roof grounding

Abstract

The invention provides a grid side circuit control method based on motor train unit roof grounding. The grid side circuit control method includes the steps that the current voltage value of arch net voltage is detected; whether the detected current voltage value of the arch net voltage meets preset conditions or not is judged; if the current voltage value of the arch net voltage does not meet the preset conditions, a vacuum circuit breaker is turned off and then turned on after first preset time; whether the current voltage value of the arch net voltage in a second preset time period meets the preset conditions or not is judged; if not, the vacuum circuit breaker is turned off and locked, and can be turned on only when unlocked by operation maintenance personnel. Therefore, when the fact that the current voltage value of the arch net voltage does not meet the preset conditions is detected for the second time, the vacuum circuit breaker is turned off and locked and is unlocked by the operation maintenance personnel, and then the operation maintenance personnel are informed of the roof grounding safety risk and the potential hazard which exist in a motor train unit.

Description

technical field [0001] The invention relates to the field of vehicle detection, and more specifically, relates to a grid-side circuit control method and device based on roof grounding of an EMU. Background technique [0002] The high-voltage network side circuit of the existing EMU such as figure 1 As shown, it includes catenary 1, pantograph catenary 2, primary voltage transformer 3, vacuum circuit breaker 4, lightning arrester 5, grounding switch 6, primary current transformer 7, main transformer 8, main converter 9, traction motor 10. Return current transformer 11 and grounding device 12 . [0003] In the actual working process, the primary side of the main transformer 8 in the EMU is powered through the catenary 1 , the pantograph catenary 2 , and the vacuum circuit breaker 4 . The traction winding on the secondary side of the main transformer 8 supplies power to the main converter 9, and the main converter 9 supplies power to the traction motor 10 through AC-DC-AC con...

AI Technical Summary

Problems solved by technology

[0005] However, the applicant found that if some equipment such as the roof of the EMU is exposed to the air, grounding may occur during the operation of the EMU, which constitutes a roof grounding problem, and the grid voltage of the pantograph-catenary 2 will be low In the normal range, and after a certain distance, some equipment on the roof is not grounded, and the grid voltage of pantograph-catenary 2 returns to the normal range

However, if only the existing technology is used to disconnect the vacuum circuit breaker 4 when the network pressure of the pantograph catenary 2 is lower than the normal range, and to close the vacuum circuit breaker 4 when the network pressure of the pantograph catenary 2 returns to the normal range, obviously the operation and maintenance personnel It is impossible to know the problem of roof grounding, and there are great safety risks and hidden dangers in the operation status of EMUs

Images