Oil paper insulation water content evaluation method based on polarization loss and electric conduction loss

Abstract

The invention discloses an oil paper insulation water content evaluation method based on polarization loss and electric conduction loss. The method comprises the following steps of 1, performing frequency domain dielectric spectrum test preparation; 2, solving relevant parameters of an oil soaking insulation paper board expansion Debye model conforming to the frequency domain dielectric spectrum matching requirements, so that the spectrum unscrambling of the oil soaking insulation paper board frequency domain dielectric spectrum test is completed; 3, calculating the electric conduction loss and the polarization loss of the oil soaking insulation paper board on the basis of the complex capacity test spectrum unscrambling result of the frequency domain dielectric spectrum of the oil soaking insulation paper board; 4, respectively making frequency curves of the electric conduction loss and polarization loss according to the electric conduction loss and the polarization loss, obtaining the intersecting point frequency of the two curves, and calculating the water content of the oil soaking insulation paper board through the intersecting point frequency of the frequency curves of the electric conduction loss and polarization loss. The problems that the reliability of an oil paper insulation water content evaluation method based on the physicochemical properties in the prior art is insufficient, and the measurement frequency band of the time domain dielectric response technology is narrow, the interference by the environment is obvious, and the like are solved.

Description

Technical field: [0001] The invention belongs to the oil-paper insulation water content measurement technology, in particular to a method for evaluating the oil-paper insulation water content based on polarization loss and conductance loss. Background technique: [0002] Oil-immersed insulating paperboard is the main insulation component of electrical equipment such as oil-immersed transformers, oil-immersed high-voltage bushings, and oil-immersed transformers. Aging causes the decline of the electrical and mechanical properties of the equipment. Among them, moisture is an important factor affecting the performance of oil-paper insulation and the main cause of failure of oil-paper insulation equipment. Therefore, it is of great significance to accurately diagnose the damp state of oil-paper insulation for the operation and maintenance of oil-paper insulation equipment, reduce the probability of equipment accidents, and maintain the safe and stable operation of the power gri...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for evaluating the water content of oil-paper insulation based on polarization loss and conductance loss, so as to solve the problem of insufficient reliability of the method for evaluating the water content of oil-paper insulation based on physical and chemical properties in the prior art, and the time-domain dielectric Response technology has a narrow measurement frequency band and is significantly disturbed by the environment. At the same time, considering that the current diagnosis method of oil-paper insulation damp state based on frequency domain dielectric spectrum has not fully utilized the advantages of frequency domain dielectric spectrum method to carry rich insulation information, it can effectively quantify Technical problems such as difficulty in extracting frequency-domain characteristic parameters reflecting the damp state of oil-paper insulation

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