Alternating current electrified railway traction network impedance frequency characteristic testing device

A technology of electrified railways and impedance frequency, which is applied in the direction of measuring devices, measuring electricity, and measuring electrical variables, etc., and can solve problems such as technical research blanks

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

AI Technical Summary

Problems solved by technology

At present, there is no special device at home and abroad that can be used to test the impedance-frequency characteristics of the AC electrified railway traction network, and the relevant technical research is basically blank.

Method used

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  • Alternating current electrified railway traction network impedance frequency characteristic testing device
  • Alternating current electrified railway traction network impedance frequency characteristic testing device
  • Alternating current electrified railway traction network impedance frequency characteristic testing device

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Embodiment Construction

[0012] Below in conjunction with accompanying drawing and specific embodiment the present invention will be further described:

[0013] The composition principle of the impedance frequency characteristic testing device of the AC electrified railway traction network of the present invention is as follows: figure 1 As shown, it consists of a step-down transformer TP, a harmonic source HS, a monitoring device MC, a voltage sensor TV, and a current sensor TA; the current sensor TA is connected in series with the primary side winding of the step-down transformer TP, and the series structure is connected to the catenary T Between the rail and the rail G, the current sensor TA is used to measure the harmonic current I injected from the primary side winding of the step-down transformer to the catenary T 1h ;The voltage sensor TV is connected between the catenary T and the rail G to measure the harmonic voltage U between the catenary T and the rail G 1h ; The secondary side winding of...

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Abstract

An alternating current electrified railway traction network impedance frequency characteristic testing device is composed of a step-down transformer TP, a harmonic source HS, a monitoring device MC, a voltage transducer TV and a current transducer TA. The monitoring device MC controls that the harmonic source HS sends harmonic current and injects a primary side winding of the step-down transformer TP into a traction network. The voltage transducer TV and the current transducer TA respectively detects harmonic voltage between a contact network T and a steel rail G and the harmonic current injected into the traction network, and the monitoring device MC receives output signals of the voltage transducer TV and the current transducer TA and finishes harmonic impedance calculation. Under the situation that the contact network is electrified, an impedance frequency characteristic of the traction network can be obtained by adjusting the frequency and amplitude of the current sent by the harmonic source, and further the harmonic frequency is obtained. The alternating current electrified railway traction network impedance frequency characteristic testing device can be used for newly-constructed electrified railway joint debugging integration test and can be also used for providing technical support for solving the harmonic vibration problem and guaranteeing power supply safety of existing lines.

Description

technical field [0001] The invention belongs to the technical field of electrified railways, and in particular relates to an impedance-frequency characteristic testing device of an AC electrified railway traction network. Background technique [0002] With the continuous development of AC transmission technology for my country's electrified railways, AC-DC electric locomotives and EMUs have begun to be put into operation in large quantities, and the old AC-DC rectifier electric locomotives will be phased out. The grid-side converters of AC-DC electric locomotives and EMUs generally adopt four-quadrant rectifiers with pulse width modulation (PWM) control technology, and the grid-side converters of different power units adopt phase-shifting control technology, making The harmonic content of grid-side current, especially the low-order harmonic content of the 3rd, 5th, and 7th orders, is greatly reduced compared with the old electric locomotive. However, the harmonic spectrum o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
Inventor 吴命利吴丽然杨少兵张洪和
Owner BEIJING JIAOTONG UNIV
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