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Method of restraining the influence of linear birefringence on full optical fiber current transformer

A linear birefringence and current transformer technology, applied in the direction of voltage/current isolation, etc., can solve the problems of circular birefringence degradation with time, to avoid complexity and unreliability, suppress errors, improve accuracy and stability Effect

Active Publication Date: 2010-05-05
STATE GRID CORP OF CHINA +2
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Problems solved by technology

Its long-term stability remains to be resolved
[0007] 3. Twist the single-mode fiber along the fiber axis to introduce a large amount of circular birefringence. This method also has the problem of circular birefringence degrading with time

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  • Method of restraining the influence of linear birefringence on full optical fiber current transformer
  • Method of restraining the influence of linear birefringence on full optical fiber current transformer
  • Method of restraining the influence of linear birefringence on full optical fiber current transformer

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Embodiment Construction

[0033] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0034] Depend on figure 1 It can be seen that when the linear birefringence Δ exists in the sensing fiber is constant, M is the attenuation oscillation function of the circular birefringence T, and in a large range of linear birefringence Δ, when the circular birefringence T is constant, M is close to 0 . Therefore, when the circular birefringence T takes a certain value, the influence of the linear birefringence can be suppressed. When M=0, the three solutions corresponding to the circular birefringence T can be obtained from formula 1: T 1 =178°,T 2 =359°, T 3 =539.5°, and at T≥700°, M is still close to 0 at a large linear birefringence Δ(42°).

[0035] T 1 ,T 2 ,T 3 The three points correspond exactly to figure 2 The three points indicated by the circle, that is, when the circular birefringence introduced by...

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Abstract

The invention discloses a method of restraining the influence of linear birefringence on a full optical fiber current transformer, which is as follows: spirally winding a sensing optical fiber on a circular hoop on the periphery of a current-carrying conductor to form an optical fiber solenoid; selecting an appropriate helical angle and radius to accurately control the round birefringence of a sensing ring; introducing the persistent existence round birefringence meeting T=178 degrees in a form 1; and restraining an error introduced by the linear birefringence; wherein M is a dying oscillation function of the round birefringence T; T is the round birefringence existing in the sensing optical fiber; and Delta is the linear birefringence existing in the sensing optical fiber. The method cansimply and accurately control the round birefringence of the optical fiber sensing ring so as to restrain the error caused by the linear birefringence, thus being capable of effectively increasing the precision and stability of the optical fiber current transformer.

Description

technical field [0001] The invention relates to a method for suppressing the influence of linear birefringence on an all-fiber-optic current transformer, which is used for improving the measurement accuracy and stability of the all-fiber-optic current transformer in a digital substation. Background technique [0002] Compared with the traditional electromagnetic transformer, the photoelectric transformer has the advantages of small size, light weight, simple insulation structure, large measurement dynamic range, high precision, strong anti-electromagnetic interference ability, good transient characteristics, easy to digitize, etc., and has no Problems such as magnetic saturation, ferromagnetic resonance, and secondary open circuit. Optical current transformers can be divided into two types according to the optical path structure: magneto-optical glass type and all-fiber. The magneto-optic glass current transformer system is composed of discrete components with complex struc...

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Application Information

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IPC IPC(8): G01R15/24
Inventor 乐全明盛晔金乃正冯亚东沈水明黄晓明许伟国周建平胡雪平傅三川阎嫦玲
Owner STATE GRID CORP OF CHINA
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