A heating circuit for a railway vehicle power supply contact rail

Abstract

A heating circuit for a railway vehicle power supply contact rail is disclosed. A positive pole of a ground DC power supply is electrically connected with one end of a positive pole contact rail, thenegative pole of the ground DC power supply is electrically connected with one end of a negative pole contact rail, and the middle section of the positive pole contact rail is electrically connected with the middle section of the negative pole contact rail through vehicle load. The structure is characterized in that the heating circuit includes an AC power supply UA1 and at least one capacitor; the AC power supply UA1, a capacitor, a positive electrode contact rail and a negative electrode contact rail form an AC loop. The heating circuit ensures the continuous and effective heating effect ofthe contact rail on the premise of not affecting the vehicle to obtain power from the contact rail and ensuring the normal operation of the vehicle, does not have any adverse influence on the vehiclepower supply loop, and has good safety and high driving efficiency.

Description

technical field [0001] The invention belongs to the technical field of rail vehicles, in particular to a rail vehicle power supply contact rail heating circuit. Background technique [0002] At present, many rail vehicles at home and abroad, such as medium and low-speed maglev vehicles, subway vehicles, light rail, straddle monorail, etc., adopt DC power supply mode for their external power supply: positive contact rail power supply, negative contact rail return (also use catenary feed, track return), the power supply voltage level is DC 1500V or DC 750V. [0003] figure 1 It is a schematic diagram of the structure of the catenary rail power supply. The patent of the present invention is not limited to describe this method, and is also applicable to the power supply method of catenary feed and rail return. figure 1 Just an example. The key components are as follows: positive contact rail 1, negative contact rail 2, ground DC power supply 3, vehicle 4, track beam 5, feeder...

AI Technical Summary

Problems solved by technology

[0008] 1) Because the impedance value of the power supply contact rail itself is relatively small, a large short-circuit current is required to produce an obvious heating effect. In this way, the ground DC power supply will work at a high current for a long time, resulting in the heating of the feed cable and its joints being higher than that of the contact rail. serious

[0009] 2) Once the switches K1 and K2 are closed, the ground DC power supply and the positive and negative contact rails form a DC heating loop ①, then during the period of heating and deicing of the contact rails, the vehicle will not be able to take power from the contact rails, that is, contact Rail heating and driving cannot be satisfied at the same time

[0010] 3) When the heating of the contact rail is stopped, the DC heating loop switch K2 is disconnected, and the vehicle can take power from the contact rail to continue running. However, the contact rail may freeze again in harsh environments, which requires the vehicle to stop working, so as to Reheat the contact rail, resulting in low driving efficiency and affecting the normal operation of the vehicle

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