Method for establishing transformer winding simulation model for sweep frequency impedance method

Abstract

The invention discloses a method for establishing transformer winding simulation model for sweep frequency impedance method. According to the method, through frequency band division, a low-frequency-band transformer winding centralized parameter equivalent model and a high-frequency-band transformer duplex winding trapezoid equivalent model are created respectively for the transformer winding simulation model for the sweep frequency impedance method. For this design, the method makes full use of the advantages of the low-frequency-band and the high-frequency-band equivalent models, and when the method is used to create a transformer winding equivalent model, it is possible to effectively simulate the frequency characteristics of the transformer winding within an entire frequency range under the sweep frequency impedance method so as to provide an accurate simulation method for the detection of the transformer winding deformation based on the sweep frequency impedance method. The method of the invention ensures the safety of the testing people and the equipment on one hand, and saves cost and time for the research on the transformer winding fault on the other hand. Therefore, the method is capable of providing basis for transformer winding equivalent circuit simulation testing used for the sweep frequency impedance method.

Description

technical field [0001] The invention belongs to the technical field of transformers, in particular to a method for establishing a simulation model of a transformer winding used in a frequency-sweeping impedance method. Background technique [0002] The frequency sweep impedance method is a new transformer non-destructive testing method that combines the advantages of the frequency response analysis method and the short-circuit impedance method. This method can accurately determine the condition of the winding by comparing the deviation of the 50 Hz short-circuit impedance value. According to the frequency-impedance curve of the transformer, it is The change of the frequency sweep impedance curve can determine the type and location of the fault. Due to the use of high-power sweep frequency signals during the test, the test signal is stronger, so the anti-interference ability is stronger, and the adverse effects caused by environmental factors are greatly reduced. Using this m...

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Problems solved by technology

Due to the use of high-power sweep frequency signals during the test, the test signal is stronger, so the anti-interference ability is stronger, and the adverse effects caused by environmental factors are greatly reduced. Using this method to measure the transformer winding once, the short-circuit impedance of the transformer can be obtained. The change of transformer impedance with frequency can also be obtained, but the existing research is based on the actual test and research of the transformer, and the actual operation often has the problem of personal and equipment injury due to irregular and unskilled operation. The cost and time consumed are also large, so it is necessary to study an efficient, accurate, safe and low-cost simulation method

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