Magneto optical current transducer

A current transformer, magneto-optical technology, applied in the direction of only measuring current, voltage/current isolation, measuring current/voltage, etc. Conducive to engineering application and maintenance, improving output power instability and improving stability

Inactive Publication Date: 2017-01-04
胡朝年
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of the all-fiber photoelectric current transformer is that the structure of the sensing head is the simplest, and it is easier to manufacture than the passive type. The disadvantages, such as the optical fiber itself and the optical fiber winding effect, linear birefr

Method used

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Examples

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Embodiment Construction

[0025] Embodiments of the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, so they are only examples, and should not be used to limit the protection scope of the present invention.

[0026] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application shall have the usual meanings understood by those skilled in the art to which the present invention belongs.

[0027] The magneto-optical Kerr effect refers to the influence of the magnetization state of ferromagnetic samples (such as iron, cobalt, nickel and their alloys) on the polarization state of the light reflected from its surface. When the incident light is linearly polarized light, the magnetism of the sample will be Causes the rotation of the polarization plane of reflected ligh...

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Abstract

The invention relates to the field of optical current sensors, and particularly relates to a magneto optical current transducer, which comprises a laser, a ring coupler, a polarization-maintaining transmission optical fiber, a one-to-two optical fiber branching device, a magneto optical module, a ferromagnetic concentrator ring, and a differential demodulator; and the magneto optical module comprises a collimator, a polarizer, a lambda/4 waveplate, rectangular optical glass and magnetized bodies at two ends. According to the magneto optical current transducer, based on poloidal surface magneto optical Kerr effects, the differential demodulator is matched, the magnitude of power frequency alternating current in a transmission line is indirectly detected through detecting the relative value of magnetized surface reflected light polarization deflection angles, and the detection precision and the device stability are improved.

Description

technical field [0001] The invention relates to the field of optical current sensors, in particular to a magneto-optical current transformer. Background technique [0002] With the continuous increase of power transmission capacity and the continuous improvement of grid voltage, in the face of high-voltage and ultra-high voltage grids, the traditional electromagnetic induction structure has gradually exposed many defects, such as: complex insulation measures, large volume, risk of explosion, Poor anti-electromagnetic ability and low measurement accuracy are gradually being replaced by smaller and safer photoelectric current transformers. Photoelectric current transformers are mainly divided into three types: active type, passive type and all-fiber type. [0003] The active photoelectric current transformer is a high-voltage side current signal that transmits the electrical signal to the light-emitting element through the sampling coil to become an optical signal, and then t...

Claims

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Application Information

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IPC IPC(8): G01R15/24G01R19/00
CPCG01R15/245G01R19/0092
Inventor 胡朝年
Owner 胡朝年
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