Method for deformation test of transformer winding by utilization of frequency sweep short circuit impedance method

A technology of transformer winding and short-circuit impedance method, which is applied in the direction of electric/magnetic solid deformation measurement, electromagnetic measurement device, etc., can solve the problems of time-consuming and labor-consuming, inconvenient on-site testing work

Inactive Publication Date: 2015-10-28
GUIYANG POWER SUPPLY BUREAU OF GUIZHOU POWER GRID CO LTD
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Problems solved by technology

In order to detect the deformation of the power transformer winding, it is generally necessary to conduct two tests of the low-voltage short-circuit impedance method and the frequency response method. However, due to the different test

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  • Method for deformation test of transformer winding by utilization of frequency sweep short circuit impedance method
  • Method for deformation test of transformer winding by utilization of frequency sweep short circuit impedance method
  • Method for deformation test of transformer winding by utilization of frequency sweep short circuit impedance method

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Embodiment Construction

[0052] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the preferred embodiments are only for illustrating the present invention, but not for limiting the protection scope of the present invention.

[0053] The method of the present invention adopts the frequency-sweeping short-circuit impedance method to test the deformation of transformer windings. The testing equipment includes a high-power sweeping signal generator capable of generating standard sine waves of any frequency. The output signal is coupled and output by a high-frequency transformer and passed through the output signal The cable is connected to the transformer winding to be tested; the test equipment also includes a broadband high-speed waveform data acquisition system, the acquisition system includes at least two acquisition channels, each acquisition channel is connected to the transformer winding ...

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Abstract

The invention discloses a method for deformation test of a transformer winding by utilization of a frequency sweep short circuit impedance method. The method integrates advantages of test technologies of a frequency response method and a short circuit impedance method, corresponding improvement is carried out, and therefore a short circuit impedance value of a transformer at 50Hz can be extracted and calculated in a low frequency stage through one-time measurement. Through comparison with the nameplate value, whether the transformer deforms can be determined elementarily and directly. In addition, further determination can be carried out by comprehensive utilization of other determination methods, so good determination effects can be achieved. The method is advantaged by convenient operation and high accuracy, and has good popularization and application values.

Description

technical field [0001] The invention relates to the technical field of electric equipment detection, in particular to a method for testing the deformation of a transformer winding by using a frequency-sweeping short-circuit impedance method. Background technique [0002] The safe operation of power transformers is directly related to the safe and reliable performance of the power supply system. In recent years, the rapid development of the power industry, especially the establishment of smart grids, ultra-high voltage and ultra-high voltage power systems, requires transformer products to be able to withstand relatively large electromotive and mechanical forces generated by high short-circuit currents. However, the winding may be deformed if the transformer is impacted during transportation and installation or suddenly short-circuited during operation. These deformations may damage the insulation of the winding or reduce the mechanical strength. If there are defects in the m...

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Application Information

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IPC IPC(8): G01B7/16
Inventor 谢荣斌李涟叶吴金勇杨超薛静张丽娟刘波李诗勇施艳张霖靳斌陈实王瑞果蔡琨申峻
Owner GUIYANG POWER SUPPLY BUREAU OF GUIZHOU POWER GRID CO LTD
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