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Absorption device for induced voltage in direct-current electrified railway traction networks

A technology for electrified railways and absorbing devices, applied in power lines, transportation and packaging, vehicle components, etc., can solve problems such as train outages, personal safety threats, and overruns, to suppress the amplitude of induced voltages, reduce the influence of induced voltages, Guaranteed normal operation

Active Publication Date: 2014-10-08
BEIJING JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The AC induced voltage generated on the DC traction network is superimposed on the DC voltage, which may lead to a voltage exceeding the allowable value of normal operation, thereby affecting the normal operation of the DC traction power supply system, and even causing equipment damage and train shutdown
At the same time, when the AC electrified railway is not powered off and the catenary of the DC electrified railway is maintained, it may pose a threat to the personal safety of the adjacent DC electrified railway operation and maintenance personnel

Method used

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  • Absorption device for induced voltage in direct-current electrified railway traction networks
  • Absorption device for induced voltage in direct-current electrified railway traction networks
  • Absorption device for induced voltage in direct-current electrified railway traction networks

Examples

Experimental program
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Effect test

Embodiment 1

[0015] Example as image 3 As shown, it consists of a LC series resonant branch and a CRL high-pass filter branch connected in parallel. Capacitance C 1 and inductance L 1 Constitute an LC series resonant branch with a resonant frequency f (f is the operating frequency of the AC electrified railway adjacent to the DC electrified railway, usually f is 50Hz or 60Hz), and connect it in parallel to the capacitor C 1 on the resistor R 1 Used for C 1 discharge. Capacitance C 2 , resistance R 2 and inductance L 2 Constitute the CRL high-pass filter branch, the cut-off frequency f of the high-pass filter branch 0 greater than f, where f 0 =1 / (2πC 2 R 2 ), f 0 The value range can be 150-800 Hz. CT 1 , CT 2 , CT Z Indicates current transformer, CT 1 Connect to the LC series resonant branch and measure the branch current, CT 2 Connect to the CRL high-pass filter branch and measure the branch current, CT Z Used to measure the total current of an induced voltage sink. T...

Embodiment 2

[0016] Example two such as Figure 4 As shown, the main circuit is composed of 4 LC series resonant branches and a CRL high-pass filter branch connected in parallel, and the capacitor C 1 and inductance L 1 Constitute a series resonant branch with a resonant frequency f (f is the operating frequency of the AC electrified railway adjacent to the DC electrified railway, usually f is 50Hz or 60Hz), and connect it in parallel to the capacitor C 1 on the resistor R 1 Used for C 1 discharge. Capacitance C 3 and inductance L 3 Constitute a series resonant branch with a resonant frequency of 3f; the capacitor C 5 and inductance L 5 Constitute a series resonant branch with a resonant frequency of 5f; the capacitor C 7 and inductance L 7 A series resonant branch with a resonant frequency of 7f is formed. Capacitance C 2 , resistance R 2 and inductance L 2 Constitute the CRL high-pass filter branch, the cut-off frequency f of the high-pass filter branch 0 greater than 7f, w...

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Abstract

An absorption device for induced voltage in direct-current electrified railway traction networks is characterized in that a main circuit is formed by parallelly connecting one or a plurality of LC (inductor-capacitor) resonance filter branches and a CRL (capacitor, resistor and inductor) high-pass filter branch, the main circuit is connected between an overhead contact system and a steel rail when installed in an internal direct-current traction network, and the main circuit is connected between a positive traction busbar and a negative traction busbar. A capacitor C<1> and an inductor L<1> form a series resonance branch with resonant frequency f; a capacitor C<n> and an inductor L<n> form a series resonance branch with resonant frequency nf (n is an odd integer); a capacitor C<2>, a resistor R<2> and an inductor L<2> form a CRL high-pass filter branch. The LC series resonance branches and the CRL high-pass filter branch in the absorption device provide a circulation passage for a power frequency component and a harmonic component in the induced voltage, amplitude of the induced voltage is suppressed accordingly, the influence of the alternating current traction network upon the induced voltage of the direct-current traction network can be effectively reduced, normal operation of a direct-current train can be guaranteed and safety of direct-current electrified railway power supply equipment and personal safety are guaranteed.

Description

technical field [0001] The invention belongs to the technical field of rail transit traction power supply, and in particular relates to an induced voltage absorbing device for a DC electrified railway traction network. Background technique [0002] With the development of my country's trunk electrified railway and urban rail transit, it is inevitable that AC and DC electrified railway lines will run adjacent to each other in parallel. The rail transit runs in parallel with the Beijing-Shanghai high-speed railway and the Shanghai-Hanrong Passenger Dedicated Line using the AC25kV AC traction network. The parallel length exceeds 4km, and the minimum distance between AC and DC traction networks is less than 10m. my country's trunk electrified railway adopts power frequency (50Hz) single-phase AC 25kV power supply system, and urban rail transit DC electrified railway adopts DC750V or DC1500V power supply system. The current in the AC traction network conductor establishes an alt...

Claims

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Application Information

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IPC IPC(8): B60M3/02B60M3/00
Inventor 吴命利王立天伍应忠杨少兵张洪和慈明洋
Owner BEIJING JIAOTONG UNIV
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