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Temperature-compensated current transformer based on fiber grating and magnetostrictive material and its current detection method

A technology of magnetostrictive materials and current transformers, applied in the field of transformers, can solve problems such as the influence of current and temperature, and achieve the effect of eliminating the influence of temperature

Inactive Publication Date: 2015-09-16
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the problem that the current detected by the existing current transformer is affected by temperature, the present invention proposes a temperature-compensated current transformer based on fiber grating and magnetostrictive material and its current detection method

Method used

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  • Temperature-compensated current transformer based on fiber grating and magnetostrictive material and its current detection method
  • Temperature-compensated current transformer based on fiber grating and magnetostrictive material and its current detection method
  • Temperature-compensated current transformer based on fiber grating and magnetostrictive material and its current detection method

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specific Embodiment approach 1

[0020] Specific implementation mode one: see figure 1 Describe this embodiment mode, the temperature-compensated current transformer based on fiber grating and magnetostrictive material described in this embodiment mode, it includes a first rectangular annular iron core 1, a second rectangular annular iron core 2, a first rectangular annular iron core The magnetostrictive device GMM1, the second magnetostrictive device GMM2, the first sensing probe FBG1, the second sensing probe FBG2, the first bias current solenoid 3, the second bias current solenoid 4 and the Current solenoid 5, the structure and shape of the first rectangular annular iron core 1 and the second rectangular annular iron core 2 are all the same, and the first rectangular annular iron core 1 and the second rectangular annular iron core 2 are mirror images Symmetrically arranged, the materials of the first magnetostrictive device GMM1 and the second magnetostrictive device GMM2 are the same, the materials and ce...

specific Embodiment approach 2

[0024] Embodiment 2: This embodiment is a further limitation of the temperature-compensable current transformer based on fiber grating and magnetostrictive material described in Embodiment 1. The first sensing probe FBG1 and the second sensing probe The probe FBG2 is a fiber grating.

specific Embodiment approach 3

[0025] Specific implementation mode three: see Figure 8 Describe this embodiment, the current detection method of the temperature-compensated current transformer based on fiber Bragg grating and magnetostrictive material:

[0026] Step 1: Apply bias current i to the first bias current solenoid 3 1 , add bias current i to the second bias current solenoid 4 2 , making the magnetic field generated at the first rectangular annular core place and the second rectangular annular iron core place have the same magnitude and opposite directions, so that the first magnetostrictive device GMM1 and the second magnetostrictive device GMM2 generate Radial strain ε 0 , at this time the corresponding center wavelengths of the first sensing probe FBG1 and the second sensing probe FBG2 are λ 0 ;

[0027] Step 2: Add the current i to be measured to the current solenoid 5 to be measured 3 , so that the strains of the first magnetostrictive device GMM1 and the second magnetostrictive device G...

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Abstract

The invention relates to a mutual inductor, and provides a current transformer based on optical fiber optical gratings and magnetostriction materials and capable of achieving temperature compensation and a current detection method thereof. An annular iron core of a first rectangle and an annular iron core of a second rectangle are respectively provided with an air gap, first magnetostriction materials are arranged in the air gap of the annular iron core of the first rectangle, second magnetostriction materials are arranged in the air gap of the annular iron core of the second rectangle, a first sensing probe is attached to the first magnetostriction materials, and a second sensing probe is attached to the second magnetostriction materials. According to the current detection method, bias currents i1 are applied to a first bias current solenoid, and bias currents i2 are applied to a second bias current solenoid; currents i3 to be detected are applied to a current solenoid to be detected; offset delta lambda 1 of the first sensing probe and offset delta lambda 2 of the second sensing probe are obtained; currents to be detected are obtained according to the delta lambda 1, the delta lambda 2, a central wavelength lambda 0, an elasto-optical coefficient Pe, a slope k which indicates the variation of stain epsilon 1 with the currents to be detected, and conversion efficiency alpha from an electric field to a magnetic field. The current transformer is suitable for measuring current values.

Description

technical field [0001] The invention relates to a transformer, in particular to a temperature-compensable current transformer. Background technique [0002] Compared with the traditional current transformer, the optical current transformer based on magnetostrictive material GMM and fiber Bragg grating FBG has excellent insulation performance, no transient magnetic saturation, large dynamic measurement range, wide frequency response, strong anti-electromagnetic interference ability, small size The advantages of small weight and light weight have become a hot spot in the field of current transformer research. However, since the FBG-GMM current transformer is very sensitive to temperature, the influence of temperature must be eliminated in the actual measurement of current. At present, the commonly used method to eliminate temperature is to paste two fiber gratings FBG on GMM and a non-magnetic alloy with a thermal expansion coefficient similar to that of GMM material, and use...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/32
Inventor 赵洪孙菲菲杨玉强曹桂源
Owner HARBIN UNIV OF SCI & TECH
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