A Sensor for Monitoring the Noise of Oil-immersed Transformer

Abstract

A sensor for monitoring the noise of an oil-immersed transformer provided by the present invention includes: a piezoelectric ceramic tube fastened by a fastening frame and a bushing, and between the piezoelectric ceramic tube and the fastening frame and the bushing There is an insulating pad between them; the piezoelectric ceramic tube, the fastening frame and the sleeve are packaged with a high temperature and transformer oil resistant material; the thermistor is installed inside the sleeve. The acoustic sensor provided by the present invention can be kept stable in transformer oil, and can withstand the high temperature when the oil-immersed transformer is in operation; and can measure the working temperature of the acoustic sensor through the built-in thermistor, thereby setting the sensitivity at the corresponding temperature, and then making The acoustic sensor can be normally used in the oil of the oil-immersed transformer, and the measured sound pressure signal is helpful to analyze the internal noise generation and propagation mechanism of the oil-immersed transformer, and can also achieve real-time monitoring of the performance of the oil-immersed transformer Purpose.

Description

technical field [0001] The invention relates to the technical field of transformer on-line monitoring, in particular to a sensor for monitoring the noise of an oil-immersed transformer. Background technique [0002] The body noise of the oil-immersed transformer mainly comes from the vibration of the iron core, winding and other structures. Therefore, when a fault such as winding deformation or looseness occurs inside the oil-immersed transformer, its body noise will change significantly. Therefore, based on the transformer body noise On-line Monitoring has great application potential. [0003] In terms of transformer noise detection, the current common method is to place a microphone outside the transformer, or install a vibration sensor on the surface of the oil-immersed transformer box, and use the measured signal to reverse the noise and vibration inside the oil-immersed transformer. Such inversion mainly relies on mathematical models, so its accuracy is difficult to gu...

AI Technical Summary

Problems solved by technology

[0004] However, common acoustic sensors (such as microphones and hydrophones) are mainly used in air and water, and most of them cannot be directly applied in transformer oil

For example, the polarized film of a common condenser microphone can be corroded by impurities (such as sulfides) contained in transformer oil; and the rubber packaging material (such as neoprene) commonly used in hydrophones will swell in transformer oil , resulting in sensor failure or changes in performance

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