Sensing optical fiber ring and Sagnac type all-fiber current transformer

Abstract

The invention provides a sensing optical fiber ring and an all-fiber current transformer based on the sensing optical fiber ring. The sensing optical fiber ring uses two torsion optical fibers with the same torsion structure and length and an inverse torsion direction of a linear polarization maintaining optical fiber; one ends of the two torsion optical fibers are fused at an angle of 0 degree; one non-fused ends of the torsion optical fibers are respectively used as two external ends of the entire sensing optical fiber ring; the two torsion optical fibers are wound on a coil framework in the same direction by using a fusing position as a start point; a start point of a start rotation section of each torsion optical fiber and a start point of a speed-reducing rotation section of each torsion optical fiber are located at the same axial wire of the coil framework; and an end point of the start rotation section of each torsion optical fiber and an end point of the speed-reducing rotation section of each torsion optical fiber are located at the same axial wire of the coil framework. With the adoption of the sensing optical fiber ring provided by the invention, the influence on the measurement of the all-fiber current transformer caused by properties of a lambda / 4 wave plate can be avoided; and meanwhile, the measurement error of the all-fiber current transformer, caused by the Sagnac effect, can be removed, so that the ubiquitous technical difficult problem of the all-fiber current transformer can be solved.

Description

technical field [0001] The invention relates to a sensing optical fiber structure and a manufacturing method thereof, and a Sagnac type all-fiber current transformer adopting the sensing optical fiber. Background technique [0002] With the continuous improvement of the voltage level and capacity of the power grid in the power system and the requirements of informatization, digitization, automation, and interaction of the smart grid, traditional current transformers have gradually exposed serious defects, and are increasingly unable to meet the requirements of power grids. The development requirements of the system, so the research of optical current transformer is imminent. A new type of all-fiber current transformer made of magneto-optical glass fiber made of magneto-optical glass is based on the Faraday effect, which can overcome the shortcomings of traditional current transformers to a certain extent and will gradually replace traditional ones. Current transformers have...

AI Technical Summary

Problems solved by technology

Because of this defect, the output change of the Sagnac sensor cannot be distinguished from the influence of the external environment or the change of the current itself in the high-voltage wire, which seriously affects the measurement accuracy of the current transformer and is not practical.

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