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

A technology of aging assessment and transformer oil, which is applied in measuring devices, testing of machine/structural components, instruments, etc., and can solve problems such as failure to support insulation, failure to replace insulation paper, and decline in mechanical strength of insulation paper

Inactive Publication Date: 2013-08-14
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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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

Method used

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

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[0051] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0052] A device for aging evaluation and life prediction of transformer oil-paper insulation. The device is:

[0053] (1) Long-term aging device

[0054] For the DHG-9070A electric heating constant temperature blast drying oven of Shanghai Hecheng Instrument Co., Ltd., such as figure 1 As shown, figure 1 It is a schematic diagram of an electric heating constant temperature blast drying oven; this equipment can achieve temperature and humidity controllable long-term heating between 0-300 degrees, and can set temperature control curves at different times; the sealing performance during heating is determined by the processing of the test vessel obtain;

[0055] (2) Polymerization degree testing device

[0056] The device uses the most commonly used method for measuring the degree of polymerization, which is to measure the kinematic viscosity of paper fibers dissolved i...

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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...

Claims

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Application Information

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IPC IPC(8): G01M99/00
Inventor 郑重于洪金指洋
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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