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Detection method and device for resonant frequency of locomotive transformer

A resonant frequency and transformer technology, applied in the field of transformer resonant frequency detection, can solve the problems of changing the input and output impedance characteristics and load capacity of the transformer, endangering the safe operation of the traction system, and the mismatch of the converter, etc. Simple device and simple detection method

Inactive Publication Date: 2015-03-04
CSR ZHUZHOU ELECTRIC CO LTD
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AI Technical Summary

Problems solved by technology

The harmonic excitation from the traction converter and the resonance effect produced by the transformer change the input and output impedance characteristics and load capacity of the transformer, resulting in a mismatch between the entire traction system and the converter, endangering the safe operation of the entire traction system

Method used

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  • Detection method and device for resonant frequency of locomotive transformer

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Embodiment 1

[0028] Such as figure 1 As shown, the output port Vs11 of the swept frequency analyzer 1 is directly connected to the input port Va12, the input port Va12 is connected to the primary coil 21 of the transformer 2, the secondary coil 22 of the transformer 2 is connected to the sampling resistor, and the sampling resistor is connected to the input of the swept frequency analyzer 1 The port Vb13 is connected, and the swept frequency analyzer 1 is also connected to the computer 5 . In order to effectively prevent electromagnetic radiation interference and reduce the bit error rate of signal transmission, the above connections are all connected by shielded communication cables 4 .

[0029] There is a signal generator and a high-speed acquisition card (not shown in the figure) in the swept frequency analyzer 1. The signal generator is connected to the output port Vs11 and can output a frequency of 0.05kHz-1MHz and a voltage of 10Vp-p. Since the output port Vs11 is directly connected...

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Abstract

The invention discloses a detection method and a device for resonant frequency of a locomotive transformer, the detection device comprises a sweep frequency analyzer, a sampling resistor and a computer, the sweep frequency analyzer comprises a signal generator and a high speed capture card, the output port Vs of the sweep frequency analyzer is directly connected with an input port Va, the high speed capture card captures the frequency, voltage and phase signal of the input port Va as the first reference signal; the sampling resistor is connected with the input port Vb of the sweep frequency analyzer, the high speed capture card captures the frequency, voltage and phase signal of the input port Vb as the second reference signal; the sweep frequency analyzer is connected with the computer, the first reference signal and the second reference signal captured by the high speed capture card are inputted into the computer, and the resonant frequency can be found by the software in the computer. The device is simple in structure, convenient to carry and can quickly and exactly detect the resonant frequency of the transformer.

Description

technical field [0001] The invention relates to safety precautions for a traction system of a high-speed rail locomotive, in particular to a method and a device for detecting the resonant frequency of a transformer that affects the safe operation of the traction system. Background technique [0002] The locomotive transformer is the core component of the high-speed rail traction system, and the transformer is connected to loads such as filter reactors and converters. The harmonic excitation from the traction converter and the resonance effect produced by the transformer change the input and output impedance characteristics and load capacity of the transformer, resulting in a mismatch between the entire traction system and the converter, and endangering the safe operation of the entire traction system. [0003] In view of the above situation, the developed locomotive transformer is tested and verified before leaving the factory to determine its resonant frequency point. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
Inventor 李小满殷强党浩张乐方亮
Owner CSR ZHUZHOU ELECTRIC CO LTD
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