CFD-based transformer respiratory system capacity matching evaluation method

Abstract

The invention provides a CFD-based transformer respiratory system capacity matching evaluation method. The method comprises the following steps: establishing a full-size three-dimensional model of a to-be-evaluated transformer and a respiratory system thereof; then, dividing a calculation domain, then setting boundary conditions and physical parameters of materials, then setting a theoretical model and a solving algorithm, setting initial conditions, calculating heat productivity and taking the heat productivity as a heat source, and finally, performing simulation to obtain oil conservator oillevel cloud chart data under different load coefficient conditions, thereby obtaining the adaptation condition of a respiratory system and a transformer. The adaptability of the transformer and the respiratory system is rapidly and accurately calculated through the CFD technology, it is guaranteed that the capacities of the transformer and the respiratory system are well matched, serious accidents such as transformer oil overflow after operation are avoided while the capacity utilization rate of the respiratory system is increased, and safe, stable and economical operation of the transformeris guaranteed.

Description

technical field [0001] The present invention relates to the technical field of state evaluation of high-voltage power equipment, and more particularly, to a CFD-based capacity matching evaluation method of a transformer breathing system. Background technique [0002] As the core equipment in the AC transmission system, the reliable operation of the transformer is very important to the safe operation of the power system. Oil-immersed transformers are always subjected to heat loads caused by heating of windings, iron cores and other components during operation. If the heat accumulates excessively in the transformer, it will endanger the life of the insulation and affect the life of the transformer. In order to keep the temperature of the transformer not exceeding the temperature rise limit of the insulation system, the insulating oil circulates naturally or forcedly inside the transformer, bringing the heat inside the transformer to the radiator and finally escaping into the a...

AI Technical Summary

Problems solved by technology

If the capacity of the breathing system cannot be well matched with the capacity of the transformer, the capacity will be wasted due to insufficient breathing, or excessive breathing will cause insulating oil to overflow and cause safety accidents

However, because the experiment is time-consuming and difficult to carry out, the selection of the existing breathing system is mainly determined by experience. There is an urgent need for a method that can deeply understand the working conditions of the breathing system during the operation of the transformer, and quickly and accurately judge the breathing of different types of transformers and breathing systems. property method

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