Simulation method for obtaining hot spot temperatures of power transformer under different working conditions

Abstract

The invention aims to provide a simulation method for obtaining hot spot temperatures of a power transformer under different working conditions. Based on the actual structure of an oil-immersed transformer, a three-dimensional simulation model of the temperature rise of the transformer is established by adopting a method of combining a finite element and a finite volume method, the influence of factors such as an electromagnetic field and oil flow on the temperature is considered, and the simulation of the hot-spot temperature distribution of the transformer is realized. The method comprises the following steps: S1, establishing a three-dimensional physical model of the power transformer; s2, performing theoretical analysis of electromagnetic field calculation of the power transformer; s3,calculating theoretical analysis of the fluid and the thermal field of the power transformer; s4, adding a corresponding physical field based on theoretical analysis of the electromagnetic field andfluid-solid heat; s5, performing field-circuit coupling connection under different working conditions according to actual operation conditions, and setting parameters and boundary conditions; s6, performing multi-physical field coupling setting; and S7, performing mesh generation on the model based on a finite element method, and performing simulation to obtain temperature distribution and hot spot temperature position results of the power transformer under different working conditions.

Description

technical field [0001] The invention belongs to the research field of load-carrying performance of electrical equipment, and relates to a simulation method for obtaining hot spot temperatures of power transformers under different working conditions. Background technique [0002] The key factors affecting the working state of power transformers in actual operation are their thermal problems and insulation problems. The temperature rise of the transformer is an important indicator to measure whether the transformer is in a safe and stable working state. Oil-immersed transformers mainly use Class A insulation. During operation, the insulating material will age due to the influence of the environment and various physical and chemical effects. High temperature will directly cause the aging of the insulating material. During the operation of power transformers, high temperature will accelerate the chemical reaction, and the mechanical strength and electrical strength of the insula...

AI Technical Summary

Problems solved by technology

Oil-immersed transformers mainly use Class A insulation. During operation, the insulating material will age due to the influence of the environment and various physical and chemical effects. High temperature will directly cause the aging of the insulating material.

During the operation of power transformers, high temperature will accelerate the chemical reaction, and the mechanical strength and electrical strength of the insulation will decrease very quickly. Therefore, the transformer will not reach its expected life and various failures and accidents will occur.

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