Current sensing device based on magnetic field sensing

A technology of sensing device and magnetic field, applied in the direction of measuring device, measuring current/voltage, measuring electrical variable, etc., can solve the problem of affecting the output result, failure to directly protect the fault, etc., to avoid the effect of temperature drift

Inactive Publication Date: 2017-08-18
HARBIN INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a current sensing device based on magnetic field sensing to solve the problem that the existing current sensor uses optical elements and needs to be equipped with photoelectric equipment, which affects the output result and cannot be directly protected when a fault occurs.

Method used

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  • Current sensing device based on magnetic field sensing
  • Current sensing device based on magnetic field sensing
  • Current sensing device based on magnetic field sensing

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specific Embodiment approach 1

[0025] Specific implementation mode one: combine figure 1 To illustrate this embodiment, a current sensing device based on magnetic field sensing described in this embodiment includes a magnetic field sensing unit (1) and a displacement sensing unit (2);

[0026] The magnetic field sensing unit (1) includes a GMM rod (1-1) and an output rod (1-2), and the GMM rod (1-1) is used to induce the magnetic field of the transmission line to generate axial expansion and contraction, so that the The strain is transmitted to the output rod (1-2);

[0027] The displacement sensing unit (2) includes a probe coil (2-1), an excitation signal source (2-2), an AC bridge (2-3), a signal demodulation circuit (2-4) and a low-pass filter circuit ( 2-5);

[0028] The excitation signal source (2-2) is used to generate a sinusoidal excitation signal, which is loaded to both ends of the probe coil (2-1) through an AC bridge (2-3);

[0029] The probe coil (2-1) is used to sense the axial expansion a...

specific Embodiment approach 2

[0032] Specific implementation mode two: combination figure 2 with image 3 This embodiment is described. This embodiment is a further limitation of the current sensing device described in Embodiment 1. In this embodiment, the magnetic field sensing unit (1) further includes a prestressing mechanism (1-3), a bias Magnetic field mechanism, shell (1-4) and base (1-5);

[0033] The base (1-5) and the prestressing mechanism (1-3) are respectively fixed at both ends of the housing (1-4); the GMM rod (1-1) and the biased magnetic field (1-3) and the inside of the space surrounded by the shell (1-4);

[0034] The GMM rod (1-1) is fixed on the base (1-5); the bias magnetic field mechanism includes a permanent magnet (1-6) and a permanent magnet frame for fixing the permanent magnet (1-6), and the permanent magnet (1-6) is used. 6) Wrap around the GMM rod (1-1);

[0035]One end of the output rod (1-2) is fixed on the end face of the GMM rod (1-1), the other end passes through the ...

specific Embodiment approach 3

[0039] Specific implementation mode three: combination Figure 4 This embodiment is described. This embodiment is a further limitation of the current sensing device described in Embodiments 1 and 2. In this embodiment, the excitation signal source (2-2) is realized by using a DDS signal source.

[0040] Such as Figure 4 As shown, the MCU is used to control the DDS, the signal generated by the DDS is amplified by the amplifier, and then loaded to the probe coil (2-1) through the AC bridge (2-3).

[0041] For the current sensing device to work, a signal needs to be applied to the probe coil (2-1), so that an eddy current will be generated in the measured object (output rod (1-2)), and a processable response signal can be provided for the subsequent circuit .

[0042] The excitation signal source (2-2) is used to generate the 1MHz sinusoidal excitation signal required by the current sensing device, and the sinusoidal excitation signal needs to be amplified to the required ampl...

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Abstract

The invention discloses a current sensing device based on magnetic field sensing, relating to the super magnetostriction material sensing technology and current vortex displacement sensing technology. The current sensing device based on magnetic field sensing aims to solve problems that the present current sensor adopts optical members and needs to be equipped with a photoelectric device, which affects the output result and cannot perform protection in time once a fault happens. A magnetic sensing unit comprises a GMM rod and an output rod; the GMM rod is used for sensing a magnetic field of a transmission line to generate axial telescoping so as to transmit strain to the output rod; a displacement sensor comprises a probe coil, an excitation signal source, an AC bridge, a signal modulation circuit and a low-pass filtering circuit; the excitation signal is used for producing a sine excitation signal which is loaded to two ends of a probe coil through an AC bridge; the probe coil is used for sensing the axial telescoping generated by the GMM rod, and a generated sensing signal is outputted after successively going through a signal modulation circuit and a low-pass filtering circuit The current sensing device based on magnetic field sensing is used for measuring bus current of an extra high voltage transmission system.

Description

technical field [0001] The invention relates to giant magnetostrictive material sensing technology and eddy current displacement sensing technology, and belongs to the field of power system measurement and protection. 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 senso...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00
CPCG01R19/0046
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
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