A Simulation Calculation Method of Cumulative Effect on Transformer's Short-Circuit Resistance

Abstract

The invention discloses a simulation calculation method for the influence of cumulative effects on the anti-short circuit capability of transformers, comprising: establishing a three-dimensional finite element electromagnetic field simulation model of the transformer according to the actual structure of the transformer; Three-phase symmetrical short-circuit current I max When the leakage magnetic field of the transformer is calculated, the maximum short-circuit current I of the transformer is calculated according to the leakage magnetic field 1 ; Add preset deformation defects to the three-dimensional finite element electromagnetic field simulation model to obtain the three-dimensional simulation defect model of the transformer after the cumulative effect; after calculating the cumulative effect, feed the three-phase symmetrical short-circuit current I in the three-dimensional simulation defect model max When the leakage magnetic field of the transformer is calculated, the maximum short-circuit current I of the transformer after the cumulative effect is calculated according to the leakage magnetic field 2 ; Contrast I 1 and I 2 , to obtain the influence of the cumulative effect on the short-circuit withstand capability of the transformer. The invention achieves the purpose of the simulation experiment through the simulation method, is easy to realize and has low cost.

Description

technical field [0001] The invention relates to the field of transformer simulation calculations, in particular to a simulation calculation method for the impact of cumulative effects on transformer short-circuit resistance capability. Background technique [0002] Transformer is one of the most important equipment in power system. Its operating condition not only affects its own safety, but also affects the stability and reliability of the entire power system. With the rapid development of the national power grid, the short-circuit capacity of transformers continues to increase, which brings greater risks to the safe operation of transformers. As the short-circuit current on the transformer increases, the short-circuit dynamic force on the winding also increases. When the transformer experiences multiple short-circuit impacts, the short-circuit dynamic force accumulates and the winding deforms. In severe cases, it even leads to damage to the internal insulation of the trans...

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Problems solved by technology

[0004] However, at present, there are few analyzes on how the short-circuit resistance capacity of the transformer, that is, the maximum short-circuit current, will change after the winding of the transformer is deformed due to the cumulative effect.

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