Grounding detecting method of power supply system of train

Abstract

The invention relates to a grounding detecting method of a power supply system of a train. A passive low-resistance midpoint grounding detecting mode is adopted and is characterized in that a grounding voltage sensor is connected in parallel on an anode line near a first resistor R1 and a second resistor R2 which are connected in series on a no-load of an original power supply system; the grounding voltage sensor is independently grounded; a middle tap is led out between the first resistor R1 and the second resistor R2 which are connected in series on the no-load of the power supply system; at least one auxiliary resistor R3 is connected between the middle tap and an independent groundling line of the grounding voltage sensor; the auxiliary resistor R3 is respectively connected with the middle tap led out between the first resistor R1 and the second resistor R2 of the no-load of the power supply system and the grounding line of the grounding voltage sensor so that when the direct current side of the power supply system of the train is grounded or when electric insulating level is decreased, a positive line or a negative line of the power supply system is equivalent to connect with a resistor relative to the ground. By adopting the invention, the detection reliability of the grounding detection of the power supply system of the train is improved, and phenomena of false operation are reduced.

Description

technical field [0001] The invention relates to a detection method of electrical equipment, in particular to a ground detection method of a train power supply system, which is mainly used for the ground detection of the train power supply system of an electric locomotive. technical background [0002] Since the fifth major railway speed increase in 2004, the DC600V train power supply system based on centralized power supply and decentralized conversion is gradually replacing the role of air-conditioned power generation vehicles, and has become the main development direction of new power supply methods for air-conditioned trains. The DC600V train power supply system adopts the method of centralized power supply and decentralized conversion, that is, electric locomotives provide DC600V power in a centralized manner, and passenger cars perform decentralized conversion. The secondary side of the main transformer of the electric locomotive has 2 passenger car power supply winding...

AI Technical Summary

Problems solved by technology

[0012] The technical problem to be solved by the present invention is to propose a grounding method in view of the fact that the detection method of the existing train power supply system is not reliable, the electromagnetic compatibility is poor, the protection value is too sensitive, it is easily interfered by the floating potential of the locomotive, and there are many malfunctions. On the basis of unity, it can effectively judge the grounding, which not only ensures reliable operation when the grounding occurs, but also ensures that the train power supply system does not malfunction during normal operation.

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