Phased ultrasound locating method and system of partial discharge of transformer

Abstract

The invention relates to a phased ultrasound locating method of the partial discharge of a transformer, which is used for monitoring and locating partial discharge faults. Phased array ultrasound sensors arranged at two different positions of the transformer are adopted to receive ultrasound broadband signals sent out by a partial discharge source, and an array model is formed; then a broadband focus algorithm in a broad-ban array signal processing algorithm is applied to convert broadband signals received by the two phased array ultrasound sensors into narrow-band signals, then a narrow-band direction finding algorithm is applied to respectively carry out direction of arrival (DOA) estimation on the two narrow-band signals, and finally a cross locating algorithm is applied to determine the concrete position of the partial discharge. Meanwhile, the invention also discloses a locating system. The invention can carry out on-line accurate locating on the partial discharge in the transformer; moreover, the used locating system has simple structure, and the method is simple and easy to apply.

Description

technical field [0001] The invention relates to a detection device for monitoring the partial discharge position of a power transformer, belonging to the technical field of detection. Background technique [0002] With the development of productivity, the requirements for the reliability of the power system operation are getting higher and higher, and the power transformer is the key equipment in the power system, and its operation reliability is directly related to the safety and stability of the power system. Statistical analysis of actual faults shows that insulation faults are the main reason affecting the normal operation of transformers, and partial discharge is an important cause of insulation faults. [0003] At present, the development of condition-based maintenance of power equipment has become an inevitable trend, and accurate localization of partial discharge not only plays an important auxiliary role in the assessment of the degree of damage of partial discharge...

AI Technical Summary

Problems solved by technology

At present, the main problem of this method is that the sensitivity of the ultrasonic sensor is very low, and the signal cannot be effectively measured on the spot; secondly, the anti-electromagnetic interference ability of the sensor is poor, and the ultrasonic signal is often distorted due to factors such as propagation path, frequency, and speed. The ultrasonic positioning method is still limited to time-domain analysis, and the accuracy is not high, which is also an urgent problem to be solved in theory and practice

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