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Non-contact current measurement device based on giant magnetostrictive material

A current measuring device and giant magnetostrictive technology, applied in the direction of using AC to DC for measurement, etc., can solve the problems of complex overall structure, influence of digital signal results, and inability to directly protect

Inactive Publication Date: 2017-09-05
HARBIN INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, these three optical current sensors have three common shortcomings: first, the temperature drift of measurement accuracy is a world technical problem for optical current sensors; second, the overall structure is relatively complicated, except that the birefringence of light affects the output results. The photoelectric equipment itself will also affect the final digital signal result; the third is that the output terminals of the sensor are all digital signals, and the transmission line can only be monitored through digital signals, and the protection action cannot be directly performed when a fault occurs

Method used

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  • Non-contact current measurement device based on giant magnetostrictive material
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  • Non-contact current measurement device based on giant magnetostrictive material

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specific Embodiment approach 1

[0033] Specific implementation mode one: refer to figure 1 and figure 2 Describe this embodiment in detail, a non-contact current measuring device based on giant magnetostrictive material described in this embodiment includes a magnetic field sensing unit and a micro-displacement measuring unit,

[0034] The magnetic field sensing unit includes: a base 1, a housing 3, a preload mechanism 4, an output rod 5 and a GMM rod 6;

[0035] The GMM rod 6 is located in the casing 3, the base 1 closes the bottom port of the casing 3, the pre-tightening force mechanism 4 closes the top port of the casing 3, a bias magnetic field 2 is provided between the casing 3 and the GMM rod 6, and the output rod 5 passes through Through the pre-tightening force mechanism 4, the head end of the output rod 5 is in contact with the GMM rod 6, and the end of the output rod 5 is located outside the shell 3;

[0036] The micro-displacement measurement unit includes: a probe 7, a pre-vibration circuit 8,...

specific Embodiment approach 2

[0039]Specific implementation mode two: refer to image 3 This embodiment is described in detail. This embodiment is a further description of a non-contact current measuring device based on giant magnetostrictive material described in Embodiment 1. In this embodiment, the pre-tightening force mechanism 4 includes: tightening Nut 41, preload spring 42 and mechanism shell 43;

[0040] The mechanism casing 43 is a barrel-shaped structure, and the opening of the tightening nut 41 and the mechanism casing 43 is threadedly connected. The bottom of the mechanism casing 43 and the tightening nut 41 are respectively provided with mutually facing through holes, and the head end of the output rod 5 is passed through. Through two through holes and in contact with the GMM rod 6, the end of the output rod 5 is located outside the preload spring 42, the output rod 5 is provided with a protruding part 51, the protruding part 51 is located in the mechanism shell 43, and the preload spring 42 i...

specific Embodiment approach 3

[0042] Specific embodiment three: This embodiment is a further description of a non-contact current measuring device based on giant magnetostrictive materials described in specific embodiment one. In this embodiment, the bias magnetic field 2 includes a permanent magnet and a permanent magnet. The magnet frame, the permanent magnet surrounds the GMM rod 6, and the permanent magnet frame is used to fix the permanent magnet.

[0043] The bias magnetic field mechanism includes a permanent magnet and a permanent magnet frame for fixing the permanent magnet. The permanent magnet surrounds the GMM rod 6 to provide a bias magnetic field for eliminating the frequency doubling effect under the dynamic application of the GMM rod 6 and moving its operating point to the linear region of the output characteristic curve to improve the accuracy of the device.

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Abstract

The invention discloses a non-contact current measurement device based on a giant magnetostrictive material (GMM), and relates to the technical field of power system metering. The invention aims to provide a non-contact magnetic field sensing unit for an ultra high voltage power transmission system bus. The non-contact current measurement device based on the GMM is provided. A GMM rod is fixed by a base and a housing while a transmission line is perpendicular to the GMM rod, so that the GMM rod can sense a magnetic field of the transmission line and be telescopic axially so as to generate and transfer the strain to an output rod. A parallel electrode plate capacitor is constituted by taking a probe as a fixing plate electrode and the end face of the tail end of the output rod as a movable plate electrode, and when the location of the output rod changes, the capacitance between the two electrode plates changes with the displacement; and in order to accurately measure the value of micro displacement, the change in the displacement is converted into the change in the oscillation frequency, then change in the frequency is then converted through a proper signal conversion module into a change in the voltage to be output, and the change in the voltage is finally converted into a voltage signal to be output.

Description

technical field [0001] The invention belongs to the technical field of power system metering. Background technique [0002] The current transformer is an important primary equipment for the construction and operation of the power system. It provides accurate and reliable measurement information for system control and protection. Its operation reliability and measurement accuracy are directly related to the safe and stable operation of the power system. With the rapid development of power transmission technology, there are more and more ultra-UHV power transmission projects, and the operation status of the power system needs to be firmly controlled. This requires more advanced and more compliant current sensors to complete this task. With the development of the electric power industry, researchers have focused their attention on new optical current sensors in recent years. Divided according to the materials used, there are three types of optical current sensors currently use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/22
CPCG01R19/22
Inventor 申岩张国庆葛津铭李洪波刘劲松韩月刘芮彤杨璐羽杨滢璇范维
Owner HARBIN INST OF TECH