Audio frequency orbit circuit impedance matching circuit in station

Abstract

The impedance matching circuit for audio frequency track circuit in station is used for ZPW-2000 automatic block equipment in heavy loading and high speed train station. The impedance matching circuit has an air gap opened transformer, a fuse, an inductor, a first capacitor, a second capacitor, and a ZPW-2000 sending or receiving set connected together. The inductor and the first capacitor constitute one industrial frequency serial resonance circuit; and the second capacitor, the inductor, the equivalent inductance of the first capacity and the transformer constitute one parallel track signal resonance circuit, so as to fit both the upward and downward trains.

Description

technical field [0001] The invention relates to a track circuit impedance matching circuit, which is applied to ZPW-2000 series non-insulated frequency-shifting automatic blocking equipment (hereinafter referred to as ZPW-2000) in stations in heavy-duty and high-speed railway signal systems. Background technique [0002] Signaling equipment is the infrastructure to ensure the safety and efficiency of railway transportation. The main standard of China’s railway interval signal control is the ZPW-2000 series track circuit, which works in an electrical insulation mode, that is, it includes a tuning area with a length of 29m. Under the conditions of heavy-duty transportation and high-speed railway, in order to ensure that the ground provides continuous operation control information to the train, ZPW-2000 will be used in the station to form an integrated track circuit continuous with the section, and the station must use mechanical insulation to divide the track The circuit repla...

AI Technical Summary

Problems solved by technology

Its disadvantages are: under the conditions of heavy-duty transportation and high-speed railway, the traction current will reach 2000A and 1000A respectively, and the unbalanced current will reach 200A and 100A respectively, the rail surface interference voltage is high, and the saturation of the transformer will affect the signal transmission. This method does not meet the indicators Require

Its defects are: lack of anti-interference index; since there are 4 types of tuning units, they are only suitable for corresponding carrier frequency signals, and the same track circuit needs to adapt to both uplink and downlink carrier frequencies, so it cannot meet the requirements, such as using two BA Switching will not only increase the equipment and cables, greatly increase the cost, but also make the system more complicated and reduce the reliability

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