Offline experimental device for 25kV-grade pantograph

Abstract

The invention discloses an offline experimental device for a 25kV-grade pantograph. The device comprises a voltage doubling circuit and a trigger control unit. The voltage doubling circuit adopts a 220V power supply, and is connected with an offline discharge circuit as an input power supply. The offline discharge circuit comprises a discharge capacitor, a discharge control switch, the pantograph, a contact line and a regulating load, which are sequentially connected. An offline control system controls the pantograph to be offline through a power unit. The trigger control unit controls the pantograph to be offline when discharge voltage is attenuated to a 25kV grade by controlling the discharge control switch and the offline control system. The sinusoidal oscillation attenuation discharge of different frequencies and different amplitudes is realized by regulating parameters of the offline discharge circuit, and the pantograph is separated from the contact line at any moment immediately when the capacitor discharges, so that a high-voltage heavy current offline phenomenon is produced to really and accurately recover realistic conditions and further make related researches.

Description

technical field [0001] The invention relates to the technical field of off-line discharge circuit for pantographs used in experiments. Specifically, the invention relates to a 25kV level pantograph off-line experimental device for simulating the off-line phenomenon of pantographs at 25kV levels under experimental conditions. Background technique [0002] During the operation of high-speed trains, due to internal factors such as catenary fluctuations and pantograph vibration aggravation, as well as external factors such as car body vibration excitation, the pantograph is separated from the contact line, resulting in the pantograph offline phenomenon. The arc discharge at the moment of off-line seriously affects the current receiving characteristics of the train pantograph; it not only ablates the contact wire and the pantograph sliding plate, shortens its service life, but also causes radio noise interference and damage to the surrounding communication lines by the high-freque...

AI Technical Summary

Problems solved by technology

For the pantograph off-line experiment under the condition of AC power supply, due to the limitation of the power supply in the laboratory, when the power supply voltage is tens of volts, the current can reach hundreds of amperes; when the power supply voltage is 220V, the current does not exceed 50A; The research uses a generator for power supply, the voltage can be increased to several thousand volts, but its current can only be maintained at 10-20A

For the off-line experiment of pantograph under the condition of DC power supply, it is also limited by the power in the laboratory. When the power supply voltage increases, the experimental current decreases; to achieve the actual high current, the power supply voltage must be reduced

It can be seen that the power supply voltage and current of the existing pantograph off-line simulation device are quite different from the actual ones. The main reason is that the power supply cannot provide enough power under the experimental conditions, so the existing experimental device has certain limitations.

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