A non-invasive ultrasonic diagnosis method for the deterioration state of electric insulating oil

Abstract

The invention belongs to the technical field of oil degradation detection and in particular relates to a non-intrusive ultrasonic diagnosis method for degradation state of electric insulating oil. Toovercome defects of conventional detection, the invention provides the non-intrusive ultrasonic diagnosis method for degradation state of the electric insulating oil, on-line ultrasonic diagnosis on aerobic aging of an oil product in situ, an ultrasonic pulse shearing wave technique is mainly used, multi-time reflection echo amplitude and phase position information of ultrasonic waves on an interface formed by an insulator wall and insulating oil to be tested inside are acquired, repeated wave impedance, shearing rheological parameters, sound velocities, sound attenuation and the like of the tested insulating oil are calculated, consumption factors are acquired according to the parameters, and thus the aging degree of the insulating oil can be evaluated. The method provided by the invention has multi-dimensional target properties, is capable of detecting oil levels, pre-evaluating oil products and reducing times of power-off sampling, and is applicable to popularization and applicationin the power industry.

Description

technical field [0001] The invention belongs to the technical field of oil deterioration detection, and in particular relates to a non-interventional ultrasonic diagnosis method for the deterioration state of electric insulating oil. Background technique [0002] During the operation of the oil-filled power transmission device, gas mixing and water absorption due to poor sealing, or impurities such as oil sludge and other compounds due to high-temperature oxidation, decomposition, copolymerization, etc., will cause oil aging, dielectric loss increase, and insulation performance. decline. [0003] On-line diagnosis of silicone oil aging for high-voltage electrical equipment has always been a challenging problem. The silicone oil in operation is continuously oxidized and loses its insulating properties under the action of electricity, heat, and chemicals; in addition, the insulating oil absorbs moisture in the air or mixes impurities due to poor sealing of electrical equipmen...

AI Technical Summary

Problems solved by technology

This method must take out the oil from the oil-filled device and send it to the laboratory after the equipment stops running, and use various complicated instruments for analysis. The biggest disadvantage is that it requires various types of complicated professional testing equipment for different purposes Multi-category professional and technical personnel operate and take a long time, and cannot be completed quickly under on-site conditions, but there are large differences in the aging degree of insulating silicone oil, and there is a range of stable values ​​for many electrical parameters

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