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Detection method of short-circuit impact resistance capability of windings of wound-core traction transformer

A traction transformer and short-circuit resistance technology, which is applied in the field of testing the short-circuit impact resistance of wound core traction transformer windings, can solve the problems of single judgment coefficient, difficult to find hidden defects, and insufficient accuracy.

Active Publication Date: 2018-09-07
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

However, the above method has the problem of low sensitivity, and it is difficult to find some hidden defects.
Due to its high precision and anti-interference ability, the frequency response method is widely used in the detection of on-site transformer winding faults, and can be used to detect the short-circuit resistance of winding core traction transformers in the factory. For evaluation, the evaluation coefficient is relatively single, the accuracy is not high enough, and experienced on-site technicians are needed to assist in the judgment

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  • Detection method of short-circuit impact resistance capability of windings of wound-core traction transformer
  • Detection method of short-circuit impact resistance capability of windings of wound-core traction transformer
  • Detection method of short-circuit impact resistance capability of windings of wound-core traction transformer

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Embodiment Construction

[0049] The implementation process of the present invention will be further detailed below with reference to the accompanying drawings.

[0050] Such as figure 1 As shown, a method for detecting short-circuit impulse resistance of winding core traction transformer windings includes the following steps:

[0051] 1) Before the short-circuit impulse test of the wound core traction transformer, measure the frequency response of each winding separately to obtain the reference frequency response Y based on the frequency f 0 (f), the frequency test range is 1kHz to 1MHz;

[0052] 2) Carry out a short-circuit impulse test on the wound-core traction transformer. At the end of the short-circuit impulse test, measure the frequency response of each winding to obtain the test frequency response Y based on frequency f 1 (f), the frequency test range is 1kHz to 1MHz;

[0053] 3) Divide the frequency range into 4 intervals: F 1 : 1kHz to 100kHz, F 2 : 100kHz to 300kHz, F 3 : 300kHz to 600kHz, F 4 : 60...

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Abstract

The invention discloses a detection method of short-circuit impact resistance capability of windings of a wound-core traction transformer. The method mainly comprises the following steps: testing frequency response of each winding before and after a short circuit; binarizing curve graphs, and calculating image feature parameters in different frequency bands; fitting frequency response curves in different frequency intervals; calculating coefficients of each order under different conditions; and using the image parameters and the transfer function coefficients as input quantity for short-circuit resistance capability effect detection. Through the detection method of short-circuit impact resistance capability of the windings of the wound-core traction transformer provided by the invention, information thereof is richer, evaluation is more accurate, and operations are more intelligent.

Description

Technical field [0001] The invention belongs to the technical field of large-scale wound core transformer testing, and in particular relates to a method for detecting short-circuit impact resistance of windings of a wound core traction transformer. Background technique [0002] Traction transformer is one of the core equipment in the traction power supply system. The traction load is intermittent. Therefore, the long-term no-load operation makes the no-load loss one of the main losses of the traction transformer, which directly affects the economics of the system operation. The technology is currently a relatively mature and reliable energy-saving technology that can be applied to large traction transformers, which can effectively improve the operating economy of the traction power supply system. [0003] Because there is no air gap in the magnetic circuit, the wound core has the characteristics of small magnetic resistance and low loss. In order to ensure that it has a low no-load...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/62G06F17/11
CPCG06F17/11G06F18/2411G06F18/214
Inventor 高仕斌周利军江俊飞严静荷郭蕾吴振宇李威
Owner SOUTHWEST JIAOTONG UNIV
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