A method for evaluating fiber attenuation of all-fiber-optic current transformers
A current transformer and all-optical fiber technology, applied in the field of optical modulation devices, can solve the problems of affecting the accuracy of current measurement, the decrease of the overall power of the system, and the increase of the signal-to-noise ratio of interference power, and achieve the effect of easy application
Active Publication Date: 2021-07-27
EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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Problems solved by technology
[0003] When fiber aging and other conditions occur, the overall power of the system will drop, which will increase the signal-to-noise ratio of the interference power measured at the measurement end, and directly affect the accuracy of current measurement. Therefore, a method for evaluating the fiber attenuation of an all-fiber current transformer is needed method
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[0023] The pure photographic current transformer calculates the current through the interference power returned by the fiber, the larger the returned interference power, the lower the measurement signal to noise ratio, the stronger the measurement stability. Assuming the same fiber, when the measured current is unchanged, the light source power is unchanged, it is found that its measurement signal to noise ratio is rising, then this signal-to-noise ratio is caused by fiber loss, we pass comparative signal noise Changes to measure the state of the fiber.
[0024] A full-optical current transformer fiber decay assessment method, which includes the following steps:
[0025] Step 1: Define the working condition of the optical fiber that is not put into the full fiber current transformer to measure, set the start source power and power step, and increase the power step by start source and start source power Long integer times are sample measurement points, acquire signal measurement va...
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The invention discloses a fiber optic attenuation evaluation method for an all-fiber current transformer, which relates to the technical field of using a light modulation device, and comprises the following steps: acquiring signal measurement values of each sampling measurement point under ideal working conditions, and calculating The ideal signal-to-noise ratio SNR of each sampling measurement point, obtain the signal measurement value of each sampling measurement point under actual working conditions, calculate the actual signal-to-noise ratio SNR' of each sampling measurement point under actual working conditions, and define the actual signal-to-noise ratio SNR' The difference from the ideal signal-to-noise ratio SNR is the fiber loss coefficient. In the present invention, the signal-to-noise ratio that can be simply measured and obtained in practical applications is used as an evaluation index for the fiber attenuation of the all-fiber current transformer, and the establishment of the method for evaluating the fiber attenuation of the all-fiber current transformer is easier to apply to actual power grid projects.
Description
Technical field [0001] The present invention relates to the technical field of light modulating devices, and more particularly to a full-optical fiber current transformer fiber decay assessment method. Background technique [0002] The current transformer is a key device in the power system, providing an electrical signal for various safety stability control, relay protection, and metering devices. Full-optical current transformer is a new type of current transformer that uses advanced optical electronics to measure electrical equipment current, only fiber optics without any active devices on the high pressure side, and only optical fiber connections between the high pressure side and the low pressure side. This new type of current transformer can achieve accurate measurement of current waveforms in a large dynamic range, directly measured DC current, representing the future development direction of current transformers. The full-optical current transformer has the advantages of ...
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IPC IPC(8): G01R35/02
CPCG01R35/02
Inventor 王越杨彭光强何竞松李清武霁阳国建宝杨光源王海军
Owner EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID