Transformer Partial Discharge Detection Method Based on Optical Fiber External Cavity FAP Sensor
A partial discharge detection and partial discharge technology, applied in the direction of testing dielectric strength, etc., can solve problems such as detection method limitations, and achieve the effects of convenient operation, suppression of influence, and enhancement of sensitivity
Active Publication Date: 2018-01-16
STATE GRID CORP OF CHINA +4
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Problems solved by technology
[0007] In the past compound eye system sensor (EFPI) partial discharge detection system, the compound eye system sensor is composed of five optical fiber external cavity FAP sensors arranged at angles; the strength of the signal received by the sensor is related to the signal source position and The angle between the vertical directions of the quartz diaphragm of the sensor has a great relationship, so its detection method is limited
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[0026] The invention proposes a transformer partial discharge detection method based on an optical fiber external cavity FAP sensor. The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0027] figure 1 It is a schematic diagram of the structure of the transformer partial discharge detection system based on the fiber optic external cavity FAP sensor. Such as figure 1 As shown, the partial discharge detection system of the optical fiber external cavity FAP sensor consists of a narrow-band light source 1, an optical filter 2, an optical splitter 3, 4 optical circulators 4, 4 single-mode optical fibers 5, and 4 optical fiber external The cavity type FAP sensor 6 is composed of four photodetectors 7, four amplifiers 8 and an oscilloscope 9; two of the optical fiber external cavity FAP sensors 6 are placed in the temperature measuring tank 12 oil on the top of the transformer, and the other two are placed in the ...
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The invention relates to a transformer partial discharge detection method based on an optical fiber external cavity FAP sensor, which belongs to the technical field of on-line partial discharge monitoring of electrical transformer equipment. Place four fiber optic external cavity FAP sensors in the oil of two temperature measuring tanks and two flange tanks integrated with the transformer on the top of the transformer respectively. The structure of the tank body is equivalent to an ultrasonic signal collector. The signal propagates through the transformer oil or the solid structure of the transformer to the tank body and through the transformer oil in the tank to the sensing head. At this time, the strength of the received signal has nothing to do with the position angle of the signal source, and the sensor signal is also stronger, while avoiding the influence of the oil pressure inside the transformer on the sensor. The sensors in four positions work simultaneously to avoid the signal being blocked by the internal structure of the transformer. The invention has high sensitivity, strong signal collection ability, convenient operation and strong anti-interference ability; it can also detect the partial discharge of the transformer well without additional auxiliary structures.
Description
technical field [0001] The invention belongs to the technical field of partial discharge on-line monitoring of power transformer equipment. In particular, it relates to a transformer partial discharge detection method based on an optical fiber external cavity FAP sensor. Background technique [0002] At present, there are many methods for on-line monitoring of transformer partial discharge at home and abroad, mainly including very high frequency (VHF) pulse current detection method, ultra high frequency (UHF) electromagnetic wave detection method and piezoelectric sensor ultrasonic detection method, among which VHF and UHF detection method It is an electrical signal, which is easily interfered by electromagnetic interference signals; the piezoelectric ultrasonic method detects ultrasonic signals, but the sensor is attached to the equipment shell to detect ultrasonic signals generated by partial discharge inside the equipment, although it is not easily interfered by electroma...
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IPC IPC(8): G01R31/12
Inventor 张春燕张映月王铭民周志成周源盛吉顾进陶风波陆云才王伟易登辉刘晗刘旭
Owner STATE GRID CORP OF CHINA