Method for detecting partial discharge direction of compound eye type optical fiber EFPI
A partial discharge and direction detection technology, applied in the direction of testing dielectric strength, voltage/current isolation, etc., can solve the problem of partial discharge detection that is not suitable for high-frequency and fast detection, the sensitivity of the Michelson method detection system is not high, and the demodulation frequency response is not enough Advanced problems, to achieve the effect of good directionality, strong anti-interference ability and high sensitivity
Active Publication Date: 2014-09-24
STATE GRID CORP OF CHINA +4
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The sensitivity of the Michelson method detection system is not high, and there is a multi-path problem in ultrasonic propagation; the demodulation frequency response of the optical fiber Mach-Zehnder interferometry is not high enough, the structure is complex, and the requirements for equipment are high; the optical fiber Fabry-Perot law has The advantages of simple structure, small size, high reliability, high sensit
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[0033] The present invention will be further described below in conjunction with the drawings and embodiments.
[0034] figure 1 It is a schematic diagram of the structure of a compound-eye optical fiber EFPI partial discharge direction detection system. Such as figure 1 As shown, a monochromatic light source with a wavelength set at 1310nm is taken as an example to illustrate a compound-eye optical fiber EFPI partial discharge direction detection system. The system structure is:
[0035] 1) A monochromatic light source with a wavelength set at 1310nm, filtered by a narrowband light source 1 through an optical fiber filter to obtain a monochromatic wavelength light source. Narrowband light source 1 selects an SLED light source, and the filter selects a 1310nm optical fiber bandpass filter.
[0036] 2) The optical fiber is a 1310nm single-mode optical fiber with a central glass core diameter of 9um and an outer diameter of the cladding 125um. After testing, it is found that the tota...
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The invention belongs to the technical field of online monitoring of partial discharge of electric power paper oil insulation electrical equipment and relates to a method for detecting the partial discharge direction of a compound eye type optical fiber EFPI. A system for detecting the partial discharge direction of the compound eye type optical fiber EFPI is utilized; voltage signals output by five identical amplifiers are connected to an oscilloscope, power is supplied, a compound eye type optical fiber external cavity type Fabry-Perot sensor is placed at the top end of an insulating rod, and the insulating rod is rotated toward an optical fiber external cavity type Fabry-Perot sensing head with the strongest signal till the partial discharge pulse amplitude of an optical fiber external cavity type Fabry-Perot sensing head located in the middle is the largest and the partial discharge pulse amplitudes of optical fiber external cavity type Fabry-Perot sensing heads placed on the periphery are roughly equal; then, the orientation of the optical fiber external cavity type Fabry-Perot sensing head located in the middle in the compound eye type optical fiber external cavity type Fabry-Perot sensor is the direction of the partial discharge point. The method is high in sensitivity, good in directivity and high in anti-interference capacity and can be used for locating the partial discharge direction of key portions of electrical equipment conveniently and accurately.
Description
technical field [0001] The invention relates to a method for detecting the partial discharge direction of a compound-eye optical fiber EFPI, and belongs to the technical field of on-line partial discharge monitoring of electric oil-paper insulated electrical equipment. Background technique [0002] At present, there are many methods for on-line partial discharge monitoring of oil-paper insulated electrical equipment (mainly transformers) 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 them, the VHF and UHF detection methods detect electrical signals, which are easily interfered by electromagnetic interference signals; the piezoelectric ultrasonic method detects ultrasonic signals, but the sensor is attached to the device shell to detect the ultrasonic signals generated by partial discharge inside the device....
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Inventor 张映月王铭民张春燕王伟秦晓东何东欣滕俊杜家振周志成李富平周源盛吉秦伟
Owner STATE GRID CORP OF CHINA
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