Transformer insulating board dampness quantitative evaluation method based on dielectric response characteristic

Abstract

The invention relates to a transformer insulating board dampness quantitative evaluation method based on dielectric response characteristic. The method has the main technical characteristic that taking oil on a detected transformer, and sending an oil sample test object to laboratory test; performing on-site dielectric spectral measurement of an transformer; calculating a dielectric constant of the transformer under specific frequency, performing dielectric spectral measurement on an insulation paper test object; establishing a XY model; calculating the integral dielectric spectrum of the transformer under different water contents; fitting a relation of the dielectric constant of the transformer and the water content of an insulating board under specific frequency; and calculating the water content of the insulating board of the transformer. The method has the advantages of reasonable design, convenient measurement and calculating, and accurate result, realizes a quantitative evaluation function of the dampness condition of the insulating board of the transformer under condition of a sampling, is helpful for accurately grasping the running state of the transformer for operation andmaintenance staff, test staff, and maintenance staff, and realizes the accurate analysis and equipment management functions.

Description

technical field [0001] The invention belongs to the technical field of transformer testing, in particular to a method for quantitatively evaluating the dampness of transformer insulating cardboard based on dielectric response characteristics. Background technique [0002] Oil-paper insulation system is the main insulation structure of oil-immersed transformers. In the oil-paper insulation system, moisture is not only the main product of oil-paper insulation aging, which reflects the water content of oil-paper insulation, but also acts as a participant in the aging process, promoting the hydrolysis of oil and paper cellulose, and irreversibly accelerating the aging of insulation materials. It can be called the "number one killer" that threatens the oil-paper insulation of transformers other than temperature. A large number of studies have found that the increase in moisture content will seriously affect the mechanical life of insulating paper, and the thermal aging speed of ...

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Problems solved by technology

A large number of studies have found that the increase in moisture content will seriously affect the mechanical life of insulating paper, and at the same time the thermal aging speed of insulating paper will increase significantly

The breakdown voltage of the oil-paper insulation system will decrease with the increase of the moisture content in the oil. When the moisture content exceeds the allowable maximum value, it will even cause the insulation performance of the equipment to fail and cause serious accidents

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