Method for rapid dielectric response test based on time domain and frequency domain combination

Abstract

The invention discloses a method for a rapid dielectric response test based on time domain and frequency domain combination. The method includes obtaining a dielectric frequency spectrum with frequency of a product to be tested being larger than a set frequency threshold value; adopting a three-electrode method to measure polarization and depolarization current curves of the product to be tested;calculating conductivity of the product to be tested according to popularization and depolarization currents; calculating to obtain a dielectric frequency spectrum with frequency of the product to betested being lower than the set frequency threshold value according to the depolarization currents and conductivity; and splicing the dielectric spectrum with frequency of the product to be tested being larger than the set frequency threshold value and the dielectric spectrum with frequency being lower than the set frequency threshold value to obtain a dielectric spectrum of the product to be tested. The method provided by the invention combines advantages of PDC and FDS, and compared with a traditional FDS measuring method, 80% of time can be saved, and an effect of accuracy is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of insulation detection, and more specifically relates to a time-frequency domain combined fast dielectric response test method. Background technique [0002] The actual operating life of high-voltage power equipment is often determined by the deterioration of its insulation performance, so it is very necessary to regularly perform insulation diagnosis on high-voltage power equipment. The traditional method of on-site measurement of power frequency dielectric loss factor can only reflect the average effect of the insulation macroscopically, and cannot distinguish the conductance loss from the relaxation loss, and cannot fully reflect the various microscopic polarization behaviors of insulating materials. Therefore, it is necessary to adopt a more comprehensive test method, to measure various polarization forms of the medium, and analyze the time-domain or frequency-domain characteristics of various polarizat...

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Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a time-frequency domain combined fast dielectric response test method, the purpose of which is to be able to perform fast dielectric response tests for all frequency ranges, thereby solving the problems in the prior art. Technical problems of limited accuracy and long test time using a single test method

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