Partial discharge ultrahigh frequency, ultrasonic wave and optical pulse combined detection system and method

Abstract

The invention relates to a partial discharge ultrahigh frequency, ultrasonic wave and optical pulse combined detection system and method used for detecting partial discharge ultrahigh frequency, ultrasonic wave and optical pulse signals in an intrusive transformer. The system comprises a partial discharge ultrahigh frequency detection module, a partial discharge ultrasonic wave detection module, apartial discharge optical pulse detection module, a light source module for partial discharge ultrasonic wave detection, a 3dB coupler module for partial discharge ultrasonic wave detection, a dual-channel photovoltaic conversion and amplifying device module, a filtering and amplifying device, a three-channel data synchronous acquisition device module, a control and display device module and a printing module. Compared with the prior art, the combined detection system has the advantages of being simple and practical and solving the electromagnetic and external visible light disturbance problem.

Description

technical field [0001] The invention relates to an intrusive partial discharge detection technology in transformer oil, in particular to an intrusive partial discharge detection system and method in transformer oil combined with UHF, ultrasonic waves and light pulses. Background technique [0002] The measurement of partial discharge is based on various phenomena produced by partial discharge, and the state of partial discharge is characterized by the physical quantity that can express the phenomenon. In addition to the transfer of charges and the loss of electrical energy, the process of partial discharge also produces electromagnetic radiation, ultrasonic waves, light emission, heat generation, and new products. Corresponding to these phenomena, the detection methods of partial discharge can be divided into two categories: electrical measurement method and non-electrical measurement method. Non-electrical measurement methods mainly include ultrasonic detection method, opt...

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Problems solved by technology

Through the partial discharge light pulse itself or after photoelectric conversion, various researches such as partial discharge spectral analysis, partial discharge light pulse detection, partial discharge location, electrical insulation aging mechanism and partial discharge electromagnetic wave propagation characteristics can be carried out, but it is easily affected by visible light, etc. Interference issues, resulting in inaccurate measurement signals

Nevertheless, methods and technologies for UHF, ultrasonic, and optical pulse partial discharge detection have been widely used in on-line monitoring, but they are all independent systems or independent sensors. human intervention judgment

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