Distributed GIS Partial Discharge Ultrasonic Optical Sensing System Based on Frequency Division Multiplexing
A technology of frequency division multiplexing and optical sensing, which is applied in the direction of using optical methods for testing, using acoustic measurement for testing, and testing dielectric strength, etc. In order to achieve the effect of fault location
Active Publication Date: 2021-06-22
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +2
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[0004] In order to solve the technical problems that GIS partial discharge ultrasonic signal propagation is complex, a single sensor is difficult to achieve effective early warning, and a system cannot realize distributed positioning sensing for multiple position ultrasonic signal detection, the present invention proposes a method based on frequency division multiplexing The distributed GIS partial discharge ultrasonic optical sensing system realizes ultrasonic sensing through Mach-Zehnder interference, adopts a tunable laser whose output frequency varies linearly with time, and constructs sensing fibers of different lengths to make the output signal of the interferometer Contains signals of multiple frequencies, and the signal frequency is proportional to the length of the sensing fiber. The signals of each frequency carry the ultrasonic signals detected by each sensor, so that the signals of each sensor can be extracted by band-pass filtering, and then passed through The phase demodulation algorithm back-calculates the ultrasonic information in each sensing signal, and finally realizes the function of distributed ultrasonic sensing
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[0017] The embodiments will be described in detail below in conjunction with the accompanying drawings.
[0018] exist figure 1 In the shown distributed GIS partial discharge ultrasonic optical interference sensing system based on frequency division multiplexing, the linear sweep light is emitted from the tunable laser 1, enters the 1×2 fiber coupler 2, and divides into two paths and enters the reference optical fibers 8 and 1 respectively. ×4 fiber optic coupler 4, the light entering the 1×4 fiber optic coupler 4 is divided into 4 paths and respectively enters 4 reference fibers 7 with different lengths, and the reference fiber 7 is connected in series with a high-sensitivity sensing unit 6 to sense the ultrasonic signal, Then the 4 channels of sensing light enter the 1×4 fiber optic coupler 5 to converge into 1 channel of sensing light signal, the converged sensing light signal and the reference light signal in the reference fiber 8 interfere in the 1×2 coupler 3, and the in...
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The invention belongs to the technical field of optical fiber sensing, and in particular relates to a distributed GIS partial discharge ultrasonic optical sensing system based on frequency division multiplexing, including: a tunable laser, two 1×2 fiber couplers, two 1×N Fiber coupler, balanced photodetector; among them, the linear sweep light emitted by the tunable laser is divided into two paths through the first 1×2 fiber coupler: one path passes through the reference fiber to the second 1×2 fiber coupler, Another path of sensing light is divided into N paths through a 1×N fiber coupler and enters N sensing fibers with different lengths. Each sensing fiber is connected in series with a high-sensitivity optical fiber sensing unit. A 1×N coupler merges into one road, and finally the second 1×2 coupler interferes with the reference light and enters the balanced photodetector for photoelectric conversion, generating electrical signals and recording data with an oscilloscope. The ultrasonic information in the sensing signal is extracted to realize the detection of the ultrasonic signal.
Description
technical field [0001] The invention belongs to the technical field of optical fiber sensing, in particular to a distributed GIS partial discharge ultrasonic optical sensing system based on frequency division multiplexing. Background technique [0002] Gas insulated switchgear GIS (Gas Insulation Switchgear) has become the mainstream equipment in high-voltage power systems due to its compact structure, not easily affected by the external environment, strong scalability, high operational reliability, and convenient maintenance. However, the inevitable occurrence of insulation defects in the actual production, transportation, and operation processes affects its long-term reliability. According to statistics, the proportion of GIS faults caused by the reduction of insulation level is very large. Partial discharge is an important characterization form of insulation fault, so it is of great significance to effectively detect partial discharge in GIS. [0003] The partial discha...
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IPC IPC(8): G01R31/12
CPCG01R31/1209G01R31/1218
Inventor 马国明张猛周宏扬李成榕吴昱怡崔博源
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)