Method for judging winding deformation based on short-circuit reactance

Abstract

The invention discloses a method for judging winding deformation based on short-circuit reactance, and the method comprises the following steps of step 1, establishing a winding equivalent circuit model; step 2, establishing a winding system parameter identification technology; step 3, obtaining the relationship between the changes in the winding system parameters and fault factors; and step 4, carrying out intelligent detection of winding deformation. In the step 1 above, the winding equivalent circuit model is created according to the needs of judgment of detecting winding deformation, and the influence rule of the physical form of the winding on the distribution parameters of winding RLC and other parameters is analyzed. The frequency sweep impedance method is a new type of transformerwinding deformation test method, which combines the characteristics of test methods on the market, has a great breakthrough in test principles, and also has the advantages such as simple and portabletest equipment, high sensitivity and clear criteria. With the method, the frequency sweep impedance curve and short-circuit impedance value of the transformer can be obtained in one test, which effectively reduces the errors caused by multiple times of wiring.

Description

technical field [0001] The invention relates to the technical field of winding deformation judgment, in particular to a winding deformation judgment method based on short-circuit reactance. Background technique [0002] Among the various equipment in the power system, the power transformer is a relatively expensive and very important pivotal equipment, and its operation reliability is directly related to the safety and stability of the entire power system. Calculated by its own price alone, the average imported 250MVA / 500kV transformer is about 1.33 million US dollars per set, and the domestically produced transformer of the same specification also reaches about 10 million yuan per set. If a large-scale power transformer has an accident during operation, it may cause a large-scale power outage. The maintenance period generally takes more than half a year, which not only costs a lot, but also has a wide impact. [0003] Statistics on transformers over the years have shown th...

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Problems solved by technology

[0004] Currently, the frequency sweep impedance method has unclear criteria for transformer winding deformation detection and relies heavily on the experience of testers

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