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

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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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 equipment and wiring methods used in the two test methods, re-wiring is required when using different test methods. , which is extremely time-consuming and labor-intensive, which brings great inconvenience to the on-site testing work

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