Device and method for evaluating oil paper insulation aging and predicting service life of transformer

Abstract

The invention discloses a device and a method for evaluating oil paper insulation aging and predicting the service life of a transformer, and belongs to the technical field of transformers of an electrical power system. The device comprises a long-term aging device, a polymerization degree test device, a tearing strength test device and the like. An accelerated aging test is performed in the long-term aging device at the temperature of 130 DEG C with an oil paper mass ratio of 20:1; furfuraldehyde content in oil and polymerization degree of a piece of insulation paper are measured; the insulation paper is subjected to a mechanical strength test; the concentration change of furfuraldehyde in oil during a process of insulation paper aging is analyzed; the paper and water content during a paperboard aging process are tested; and gas content in oil is tested. Most of transformers are subjected to insulation aging and quit operation primarily due to the fact that the mechanical strength of the insulation paper is lowered and cannot support sufficient insulation. The device and the method which are provided by the invention can evaluate the insulation state of the transformer and predict the residual operation life of the power transformer. Therefore, the examination and repair can be reasonably arranged according to the equipment aging condition, the optimization of equipment use ratio is facilitated; and the management level of power enterprises is improved.

Description

technical field [0001] The invention discloses a device and a prediction method for transformer oil-paper insulation aging evaluation and life prediction, belonging to the technical field of power system transformers. Background technique [0002] Large-scale power transformers are the main equipment in the power system and the core equipment of the substation. They are responsible for the important task of power transmission in the system. Its operating status is directly related to the safe operation of the system. The key to running. [0003] The reliable operation life of the transformer is determined by the state of its insulation structure, and the main insulation structure of the transformer is oil-paper composite insulation, which has a long history and has been proved to be very suitable for the insulation of high-voltage power equipment. Due to the influence of various external effects, For example, the load and temperature of the transformer during operation, the...

AI Technical Summary

Problems solved by technology

As for insulating paper, during the aging process, its electrical strength and mechanical strength will decrease and the insulating paper cannot be replaced, and the decline in mechanical strength is particularly obvious.

In addition, a large number of studies have found that the root cause of most transformers out of service due to the aging of their insulation is that the mechanical strength of the insulating paper is reduced and cannot support sufficient insulation

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