Sensing optical fiber coil and vibration-resistant type all-optical fiber current transformer

Abstract

The invention provides a sensing optical fiber coil and an all-fiber current transformer, wherein the sensing optical fiber coil is formed by winding a sensing optical fiber through a special method, and the all-fiber current transformer is made of the sensing optical fiber coil. The sensing optical fiber coil comprises a section I optical fiber ring and a section II optical fiber ring which are formed by winding a twisted optical fiber on a coil skeleton in the shape of an '8', wherein the section I optical fiber ring and the section II optical fiber ring are opposite in winding direction, the section I optical fiber ring is composed of a starting rotation section and a speed reducing rotation section of the twisted optical fiber, and the section I optical fiber ring is composed of a high-speed constant-speed rotation section of the twisted optical fiber. The axis of the section I optical fiber ring is parallel to the axis of the section II optical fiber ring, and the enclosing area of the section I optical fiber ring equals the enclosing area of the section II optical fiber ring. The section I optical fiber ring is used as a compensation ring of the sensing optical fiber coil, the section II optical fiber ring is used as a sensing ring of the sensing optical fiber coil, and a current wire penetrates through the section II optical fiber ring. According to the sensing optical fiber coil and the all-optical fiber current transformer, the influence on the measurement of the all-optical fiber current transformer due to incomplete performance of lambada / 4 wave plates is avoided, and meanwhile, measurement errors, caused by the Sagnac effect due to vibration, of the all-fiber current transformer are eliminated.

Description

technical field [0001] The invention relates to a sensing optical fiber structure and a manufacturing method thereof, and an all-fiber current transformer using 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 become one of...

AI Technical Summary

Problems solved by technology

This makes the sensing fiber affected by the position of the current wire, so it does not have good anti-interference ability and is not suitable for practical applications

[0005] The Chinese utility model patent with the application number 201120417236.7 designed a sensing optical fiber ring, which solved the problem that the sensing optical fiber of the aforementioned patent (application number 200910262107.2) is sensitive to the spatial position, but there are still some problems that cannot be ignored in this patent: Since the current wire is placed at any position in the optical fiber ring, the temperature changes caused by the current at each point on the sensing fiber are different, and since the sensing fiber itself is more sensitive to temperature, this will introduce a certain phase error

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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