Multiple feed loop detection method, system and device

Abstract

The invention discloses a multiple feed loop detection method which is applied to a power supply loop that an overhead line system and a third rail are both connected with a locomotive main driving system through isolative conduction devices. The detection method comprises the steps that first voltage of a stand-by power supply loop is obtained through a first voltage sensor; a current locomotivemain driving system is powered up by a target power supply loop, the target power supply loop is an overhead line system power supply loop or third rail power supply loop, and the stand-by power supply loop is the third rail power supply loop or overhead line system power supply loop in a standby state; when the first voltage is within a preset range, the situation that the stand-by power supply loop and the target power supply loop are powered up in series and conducted is judged, and corresponding failure treatment is made. A multiple feed loop detection system is simple in circuit and smallin occupied space, and can be applied to power supply loops provided with isolative conduction devices. When a series powered-up conductive failure occurs on the stand-by power supply loop, the firstvoltage is changed to be within the preset range, treatment can be timely conducted on the failure after the change is detected, and a protective control measure is taken so as to prevent losses frombeing enlarged.

Description

technical field [0001] The invention relates to the field of rail transit, in particular to a detection method, system and device for a multi-power supply circuit. Background technique [0002] Under the power supply mode of DC catenary, third rail or battery, the traction main circuit of the battery electric engineering vehicle passes the direct current of different voltage levels (such as DC1500V or DC800V) through the high-speed circuit breaker, the filter of the chopper reactor and the traction inverter. After the inverter is turned, the three-phase voltage is provided to the subsequent three-phase AC asynchronous traction motor to meet the operation requirements of the engineering vehicle. The schematic diagram of the main circuit of the battery power engineering vehicle under the three-power supply mode is as follows: figure 1 shown. Among them, the catenary, the third rail and the traction battery are all high-voltage power supplies. In order to avoid series electri...

AI Technical Summary

Problems solved by technology

However, the short-term high voltage or the quality problem of the device itself will cause the diode to be broken down, which will make the circuit between the catenary and the third rail conduct

At this time, if the bow is charged in the warehouse, the current receiver under the car will also be charged with high voltage, and there will be a safety hazard of electric shock

According to the known and mature diode products currently on the market, their breakdown will lead to a short circuit, and there is no indicator, so the breakdown fault cannot be quickly found and dealt with accordingly

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