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Apparatus and method for measuring conductor current by using magneto-optic material

A magneto-optical material and conductor current technology, applied in the direction of measuring devices, measuring current/voltage, and only measuring current, can solve the problems of bulky equipment, inconvenient measurement of conductor current, and measurement errors

Active Publication Date: 2016-08-17
HEBEI UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the electromagnetic mutual inductance measurement method is generally used in this field. The measurement technology of this method is very mature, but there are some serious shortcomings: 1. The equipment is bulky (because there are wire packages and iron cores); 2. During the mutual inductance process High energy consumption; 3. In order to prevent overheating, it is necessary to immerse the heating part of the equipment in oil, which brings great hidden dangers to public safety and normal life order
This situation brings inconvenience to the use of magneto-optical materials to measure the conductor current, and measurement errors will occur due to small changes in the angle between the magneto-optic material and the conductor

Method used

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  • Apparatus and method for measuring conductor current by using magneto-optic material
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  • Apparatus and method for measuring conductor current by using magneto-optic material

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Embodiment 1

[0087] Embodiment 1, a method for measuring conductor current by using a magneto-optical material.

[0088] The embodiment of the present invention uses two magneto-optical crystals (a magneto-optical material) as sensing heads (or current sensing devices) to measure the conductor current and eliminate the measurement caused by the change of the placement angle between the sensing head and the conductor. Error, the specific theoretical basis is as follows:

[0089] Such as figure 1 and image 3 As shown, when the current in the conductor is I, the magnetic induction intensity at the position of the magneto-optical material whose distance from the conductor is R is B. According to the Ampere loop theorem, the relationship between B and I is:

[0090] ∮ C B·dl=μ 0 ∫∫ S J·dS=μ 0 I enc (1)

[0091] Suppose the conductor is a long straight wire, when the current is I, the magnetic induction intensity B at the distance R from the conductor is:

[0092] B ...

Embodiment 2

[0133] Embodiment 2, a device for measuring conductor current using a magneto-optical material.

[0134] Such as Figure 5 As shown, the device in this embodiment includes a first magneto-optic crystal 1, a second magneto-optic crystal 2, a beam splitter 4, a first polarizer 5, a second polarizer 6, a first analyzer 7, a first polarizer Two analyzers 8, a first photodetector 9, a second photodetector 10, a signal processing circuit, a light source, and an optical path transmission device (such as an optical fiber, etc.) to realize the connection of these devices.

[0135] The first magneto-optic crystal 1 and the second magneto-optic crystal 2 are all arranged near the conductor 3 to be tested, and the installation distances of the first magneto-optic crystal 1 and the second magneto-optic crystal 2 from the conductor 3 to be tested are equal, both being R; The relative position of the two magneto-optic crystals remains unchanged. When measuring the conductor current, the ang...

Embodiment 3

[0142] Embodiment 3, a device for measuring conductor current using a magneto-optical material.

[0143] Such as Figure 6 As shown, the difference between this embodiment and Embodiment 2 is that the polarization beam splitting unit in this embodiment is composed of a first polarizer 5 and a beam splitter 4 . The first polarizer 5 is placed behind the light source, which is used to receive the measurement light emitted by the light source and generate a beam of linearly polarized light. The beam splitter 4 is arranged between the first polarizer 5 and the two magneto-optical crystals, and the beam splitter 4 is used to split a beam of linearly polarized light from the first polarizer 5 into two beams of linearly polarized light, respectively Transmitting linearly polarized light (that is, the first linearly polarized light) and reflecting linearly polarized light (that is, the second linearly polarized light); the two beam-split linearly polarized lights are respectively inc...

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Abstract

The invention provides an apparatus and method for measuring conductor current by using magneto-optic material. Two magneto-optic material parts serve as sensing heads. When the current of a conductor is measured, the relative position of the two magneto-optic material parts remains unchanged, and the included angle delta theta between the inner light passing directions of the two magneto-optic material parts satisfies the relationship of 0< delta theta <180. When the two magneto-optic material parts are situated in a magnetic field formed by the powered-on conductor, the polarization direction of the polarized light passing the two magneto-optic material parts deflects due to Faraday effect. The current passing the conduct can be calculated by measuring the deflection angle of the polarization direction of each polarized light after the two polarized light beams pass through the two magneto-optic material parts and combining with the fixed included angle between the inner light paths of the two magneto-optic material parts. When the current of a conductor is measured by using the method and apparatus disclosed in the invention, the installation angle between the magneto-optic material parts and the conductor is insensitive, and the measurement error caused by the uncertainty of the installation angle between the magneto-optic material parts and the conductor in the prior art can be eliminated.

Description

technical field [0001] The invention relates to the technical field of current measurement, in particular to a device and method for measuring conductor current by using magneto-optical materials. Background technique [0002] Current measurement, especially large current measurement, is an important task in power system, power supply system and large-scale production enterprises in terms of power guarantee. At present, the electromagnetic mutual inductance measurement method is generally used in this field. The measurement technology of this method is very mature, but there are some serious shortcomings: 1. The equipment is bulky (because there are wire packages and iron cores); 2. During the mutual inductance process High energy consumption; 3. In order to prevent overheating, it is necessary to immerse the heating part of the equipment in oil, which brings great hidden dangers to public safety and normal life order. [0003] In recent years, the use of optical sensing te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00G01R15/24
CPCG01R15/246G01R19/0092
Inventor 杨丽君刘再旺尉长江姚晓天钦明亮
Owner HEBEI UNIVERSITY