Switch state detection circuit, overphase device, detection method and control method

Abstract

The invention discloses a switch state detection circuit, an over-phase separation device, a detection method and a control method. The detection circuit includes more than two voltage detection modules, and each voltage detection module is correspondingly connected to two ends of a thyristor valve group for Detect the voltage state of the thyristor valve group, wherein at least one voltage detection module is configured to detect the forward voltage state of the thyristor valve group, and at least one voltage detection module is configured to detect the reverse voltage state of the thyristor valve group; the excessive phase Each phase change switch in the device is connected with a voltage detection module; the detection method is to realize the detection of the off state of the phase change switch; the control method controls the phase change by detecting the off state of the phase change switch. The invention realizes simple structure, low cost, and can simultaneously detect the forward and reverse voltage states of the thyristor in the commutation switch, realizes fast and accurate detection of the off state of the commutation switch, and reduces commutation time.

Description

technical field [0001] The invention relates to the technical field of electrified railway traction power supply, in particular to a switch state detection circuit, an over-phase separation device, a detection method and a control method. Background technique [0002] Due to the particularity of the traction power supply mode and the train operation mode of the railway system, there is usually a neutral isolation area of ​​about 200-900m every 30-60km, which acts as a separation between different electrical phases, that is, the "electrical phase separation" area or " Neutral zone", the way that electric traction trains or EMUs pass through this zone is "excessive phase". In order to prevent manual misoperation by the driver, arcing and catenary damage caused by electrified phase splitting, there are currently two methods including automatic over-phase separation when the vehicle is powered off, and automatic over-phase separation on the ground. The running time cannot be co...

AI Technical Summary

Problems solved by technology

For example, electronic switches such as thyristors have a time delay when they are completely turned off. In the above-mentioned over-phase separation process, when controlling the switching of two commutation switches, usually after the previous switch is turned off, the latter one is turned on after a certain period of time delay. Switch, as mentioned above, when the switch SCR_V1 is turned off, then delay to turn off SCR_V2, but if the previous switch has not been completely turned off, turning on another switch at this time will cause a short-circuit current

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