Transformer oil quality comprehensive evaluation method based on multi-frequency ultrasound

Abstract

The invention relates to a transformer oil quality comprehensive evaluation method based on multi-frequency ultrasound, and belongs to the field of transformer oil aging degree detection. The method comprises the following steps: S1, carrying out multi-frequency ultrasonic testing on transformer oil samples with different operation years, and independently detecting electrical insulation parameters of each oil sample by adopting a traditional parameter detection method; s2, calculating and scoring the electrical insulation parameters by utilizing an improved analytic hierarchy process and an expert weight matrix, and then giving the state grade of each oil sample according to the score; s3, using multi-frequency ultrasonic test data as input, taking the state grade of each oil sample as output, and using an SVM for establishing a transformer oil quality comprehensive evaluation model; and S4, obtaining an acoustic frequency spectrum of the transformer oil sample to be detected, and judging the quality of the transformer oil to be detected by utilizing the transformer oil quality comprehensive judgment model. According to the invention, the experiment time and the experiment cost are greatly saved, and the method has important significance for ensuring the safe and reliable operation of the oil-immersed power transformer.

Description

technical field [0001] The invention belongs to the field of detecting the aging degree of transformer oil, and relates to a method for comprehensively evaluating the quality of transformer oil based on multi-frequency ultrasound. Background technique [0002] As the key hub of the power system, the transformer is responsible for the power transmission and transformation tasks of the entire power grid. Its good safety performance is the guarantee for the normal and stable operation of the power system. Under the action of physical and chemical factors such as light, oxygen, heat, magnetic field, electric arc, electric field and radiation, transformer oil will change the performance of insulation characteristic indicators such as moisture, breakdown voltage, interfacial tension, and dielectric loss. The performance will drop or deteriorate, and then its insulation performance will be deteriorated and lost. The deterioration of transformer oil insulation performance will great...

AI Technical Summary

Problems solved by technology

Although the quality accuracy of transformer oil measured by this method is extremely high, each parameter requires different testing equipment, which undoubtedly increases the economic cost

In addition, this method needs to take the oil sample from the transformer in operation and send it to an external laboratory for testing, so there are problems such as sampling and storage that are easy to be polluted

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