Finite element method-based composite insulation state evaluation method considering sleeve oil-paper insulation non-uniform thermal aging effect

Abstract

The invention relates to the technical field of electrical equipment fault diagnosis, and a finite element method-based composite insulation state evaluation method considering a sleeve oil-paper insulation non-uniform thermal aging effect. The method comprises the steps of: constructing an equivalent physical composite model; obtaining FDS data of an insulating paperboard sample in different aging states; building a laboratory composite model, and testing an FDS curve of the model; building a composite insulation simulation model, and carrying out mesh generation on a calculation area by adopting a polyhedral mesh; determining the material parameters of the composite insulation simulation model so as to obtain a simulation FDS curve of the sleeve oil-paper insulation; expanding the composite insulation simulation model to a 3-D simulation model, and performing simulation calculation on the 3-D simulation model; and verifying the feasibility of the two simulation models. According to the method, the FDS and FEM technologies are combined to construct the simulation model of the sleeve oil-paper insulation under the non-uniform thermal aging effect, the problem that large experimental errors exist in an FDS testing process is solved, and a basis is provided for analyzing the FDS of a sleeve oil-paper insulation system under the non-uniform thermal aging effect.

Description

technical field [0001] The invention belongs to the technical field of electrical equipment fault diagnosis, and in particular relates to a composite insulation state evaluation method based on the finite element method considering the uneven thermal aging effect of casing oil-paper insulation. Background technique [0002] With the rapid development of the power industry, the power system has increasingly strict requirements on the insulation level of its operating electrical equipment, and the insulation performance directly affects the stability and safety of the power system operation. As a key structural component used in conjunction with high-voltage electrical equipment, high-voltage bushings have become an important topic in the field of high-voltage power. At present, oil-immersed capacitive bushings are widely used as the core component for connecting transformers and external equipment. The insulation system of oil-filled capacitor bushings is affected by heat, o...

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Problems solved by technology

[0004] In fact, due to the Joule heating of the bushing guide rod metal and the Joule heating caused by the dielectric loss, this will cause a temperature gradient in the radial direction of the casing oil-paper insulation system, and the temperature will affect the aging rate of the insulating paper so that the insulating paper layer There will be different aging degrees in the radial direction. The previous FEM-based casing simulation model mainly studies the uniform aging state of the casing, and there are few reports on the uneven aging state of the oil-paper insulation of the casing.

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