Transformer partial discharge positioning system and method based on acoustic-electric joint detection

Abstract

The invention discloses a transformer partial discharge positioning system and method based on acoustic-electric combined detection, in the transformer partial discharge positioning system based on acoustic-electric combined detection, a plurality of optical fiber ultrasonic sensors are arranged in a transformer to detect multiple paths of ultrasonic signals generated by partial discharge in the transformer; a light source module is connected with the optical fiber ultrasonic sensors, and an ultrahigh frequency sensor is arranged in the transformer to detect UHF signals generated by partial discharge in the transformer; an edge calculation module is connected with the optical fiber ultrasonic sensors and the ultrahigh frequency sensor so as to receive and process the ultrasonic signals and the UHF signals, and the edge calculation module extracts signal features of the ultrasonic signals with the arrival time of the UHF signals as the zero point so as to form a data set; and the intelligent monitoring terminal module is connected with the edge calculation module to generate a positioning result based on the data set, and positions the discharge source based on the data set in a first preset range of the pitch angle and a second preset range of the direction angle to obtain a positioning coordinate result.

Description

technical field [0001] The invention relates to the technical field of power equipment state monitoring, in particular to a transformer partial discharge positioning system and method based on combined acoustic-electric detection. Background technique [0002] It is a common problem in high-voltage insulation that partial discharge occurs in some weak parts of the insulation of power equipment under the action of strong electric field. If partial discharge exists for a long time, it will lead to insulation degradation or even breakdown under certain conditions. Locating the partial discharge of power equipment can not only understand the insulation state of the equipment, but also find the location of the insulation defect of the equipment in time, which is convenient for later maintenance and repair. The accurate location of partial discharge in power equipment is directly related to the design, production, manufacture, operation and maintenance of the insulation structure...

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Problems solved by technology

[0003] At present, the existing partial discharge positioning system generally uses ordinary ultrasonic sensor probes. Compared with the optical fiber EFPI ultrasonic sensor, there are problems such as low sensitivity and narrow frequency band. Due to its poor positioning accuracy, it is impossible to accurately locate the discharge source. , so it is difficult to combine the positioning results with the three-dimensional visual structural model of the transformer, and the positioning results are not intuitive enough

At the same time, the existing partial discharge positioning system is usually bulky, the interface is not standardized, the compatibility is not strong, and it cannot be plug-and-play and coordinated with various personal computers, and the existing system usually directly uses the original The time-domain waveform data is transmitted to the terminal and calculated based on the complete signal time-domain waveform data. Not only is the data volume huge, but the calculation complexity is high, which puts great pressure on the communication and computing power of the system

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