Grounding and protecting method for medium-low speed maglev train

Abstract

The invention discloses a grounding and protecting method for a medium-low speed maglev train. A resistor is connected in parallel between a negative pole rail in a transformer substation of the power supply system of the medium-low speed maglev train and the ground, and the train body of the medium-low speed maglev train and the negative pole rail are short circuited. The method has the advantages of simple principle, low cost, convenience of operation, high reliability and the like.

Description

technical field [0001] The invention mainly relates to the design field of medium and low speed maglev trains, in particular to a grounding and protection method for medium and low speed maglev trains. Background technique [0002] Medium and low-speed maglev trains are powered by DC 1500V or 750V. The power supply system adopts three or four rail contact current receiving methods. The contact rail and the track beam are installed overhead with insulators. When the vehicle is running, the vehicle suspension control system controls the distance between the vehicle and the track. Keeping a certain gap and no contact with the track, the power of the vehicle traction is provided by the linear induction motor. [0003] In the prior art, rail transit systems that operate similarly to medium and low-speed maglev trains include subway direct trains and straddle-type monorail vehicles. figure 1 Shown is the grounding and protection scheme of the direct train system of the subway. Th...

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Problems solved by technology

[0006] (1) The grounding and protection scheme of the subway direct transmission system is adopted. Although the connection between the vehicle and the running rail is used, and the leakage resistance of the rail to the ground is used to solve the static electricity of the vehicle and the induced electricity caused by the linear motor traction, at the same time The running rail, that is, the ground voltage of the vehicle, is clamped within an allowable range, but there are still two problems: one aspect is that although drainage devices, track insulation installations and other measures to collect and eliminate stray currents are installed, However, the stray current still exists, and the current value is very large. Another aspect is that the medium and low-speed maglev train adopts the power supply method of the contact rail instead of the overhead catenary. some protection;

[0007] (2) The grounding and protection scheme of the straddle monorail system is adopted, although the series grounding circuit of diodes and 5-50 ohm resistors and the 64D protection device solve the power supply system of stray current and short circuit of the positive pole of the contact rail system to ground Protection, the static electricity of the vehicle can be released by installing the grounding rail and the grounding discharge brush on the vehicle at the station, depot, and parking lot. However, since the drive of the medium and low-speed maglev train uses a traction linear motor, the impact of its edge effect will be on the car body. However, the straddle monorail system uses a rotating motor for traction, so there is no problem of induced electricity. Therefore, this grounding and protection scheme cannot solve the problem of induced electricity generated by the edge effect of linear motor traction on vehicle electronic equipment. electromagnetic interference

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