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Thin film type optical current transformer based on straight-through type

A current transformer and film-type technology, applied in voltage/current isolation, measuring current/voltage, instruments, etc., can solve the problems of complex optical path system and reduced operational stability of optical current transformers, and simplify the transmission and conversion process , simple structure, and the effect of improving stability

Active Publication Date: 2014-06-04
北京世维通光智能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problem of the complex optical path system in the existing optical current transformer structure and the long-term operation stability reduction of the optical current transformer due to the complex optical path system

Method used

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  • Thin film type optical current transformer based on straight-through type
  • Thin film type optical current transformer based on straight-through type

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specific Embodiment approach 1

[0018] Specific implementation mode one: refer to figure 1 and figure 2 Describe this embodiment in detail. A straight-through thin-film optical current transformer based on this embodiment includes a light source 1, a No. 1 optical fiber 2, a No. 1 polarization controller 3, a No. 2 optical fiber 4, a sensing head 5, and a third No. optical fiber 6, No. 2 polarization controller 7, No. 4 optical fiber 8 and photodetector 9;

[0019] The sensing head 5 includes a casing 5-1, a No. 1 lens 5-2, a No. 2 lens 5-3, a No. 3 lens 5-4, an optical fiber input connector 5-5 and an optical fiber output connector 5-6;

[0020] A No. 4 lens 5-7 is arranged inside the fiber input connector 5-5, and a No. 5 lens 5-8 is arranged inside the fiber output connector 5-6;

[0021] The optical fiber input connector 5-5 and the optical fiber output connector 5-6 are respectively fixed on the two ends of the casing 5-1, and the first lens 5-2, the second lens 5-3 and the third lens 5-4 are fixed o...

specific Embodiment approach 2

[0026] Specific Embodiment 2: This embodiment is a further description of the straight-through thin-film optical current transformer described in Specific Embodiment 1. In this embodiment, the lengths of the No. 1 optical fiber 2 and the No. 3 optical fiber 6 equal, and the lengths of the No. 1 optical fiber 2 and No. 3 optical fiber 6 range from 10m to 100m; the lengths of the No. 2 optical fiber 4 and No. 4 optical fiber 8 are equal, and the No. 2 optical fiber 4 and No. 4 optical fiber The length of 8 ranges from 1m to 20m.

specific Embodiment approach 3

[0027] Specific embodiment three: This embodiment is a further description of the through-type film-based optical current transformer described in specific embodiment one. In this embodiment, the No. 1 polarization controller 3 and the No. 2 polarization controller 7 The deflection angle is 22.5 degrees.

[0028] In this embodiment, both the No. 1 polarization controller 3 and the No. 2 polarization controller 7 have an off angle of 22.5 degrees, which is equivalent to a polarizer with an off angle of 45 degrees.

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Abstract

The invention provides a thin film type optical current transformer based on a straight-through type and belongs to the field of optical current transformers. The problems that an optical path system is complex in the structure of an existing optical current transformer and the stability of the existing optical current transformer is reduced after being operated for a long term due to the complex optical path system are solved by the thin film type optical current transformer. A light source, a first optical fiber, a first polarization controller, a second optical fiber, a sensing head, a third optical fiber, a second polarization controller, a fourth optical fiber and a photoelectric detector are connected sequentially. An optical fiber input joint and an optical fiber output joint of the sensing head are fixedly connected to the two ends of a casing pipe respectively. A first lens, a second lens and a third lens are fixed to the inner portion of the casing pipe. The first lens, the second lens, the third lens, a fourth lens and a fifth lens are coaxial with the casing pipe. The surface of one of the first lens and the third lens is plated with a magnetic thin film material. According to the structure, the optical path system of the optical current transformer is simplified and the stability after the optical current transformer is operated for a long time is improved. The thin film type optical current transformer based on the straight-through type is suitable for current detection.

Description

technical field [0001] The invention belongs to the field of optical current transformers. Background technique [0002] The current transformer is an important equipment for electric energy measurement and relay protection in the power system. Its measurement accuracy and operation reliability directly affect the safe operation of the power system. With the increase of the voltage level in the power system, the traditional current transformer has gradually exposed a series of shortcomings in the measurement and operation, such as the large fault current leads to the magnetic saturation of the iron core, so that the actual magnitude and change process of the fault current cannot be recorded; The large inductance of the iron core leads to phase lag and limits the frequency response, so that the high-frequency component of the fault current cannot be recorded, which is not conducive to fault analysis; the open circuit of the output leads to high voltage; it is large in size, h...

Claims

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Application Information

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IPC IPC(8): G01R15/24G01R19/00
Inventor 沈涛胡超魏新劳于雪莲
Owner 北京世维通光智能科技有限公司