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Electronic mutual inductor suitable for gas insulated substation large current measurement

An electronic transformer and gas-insulated technology, which is applied in the direction of measuring electric variables, voltage/current isolation, and measuring current/voltage, can solve the problems of weakening the magnetic field of fixed conductors, etc., and achieve improved dynamic measurement range, wide measurement range, and magnification The simple effect of the circuit

Active Publication Date: 2017-08-18
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, when it is actually applied to an electronic transformer for large current measurement, how to design the shielding layer structure and shield the external magnetic field interference while weakening the magnetic field of the fixed conductor to improve the dynamic measurement range of the TMR magnetic field sensor is a technical problem that needs to be solved

Method used

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  • Electronic mutual inductor suitable for gas insulated substation large current measurement
  • Electronic mutual inductor suitable for gas insulated substation large current measurement
  • Electronic mutual inductor suitable for gas insulated substation large current measurement

Examples

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example

[0038] 1. Finite element analysis method

[0039] In this example, a sensor based on the TMR effect is used. The frequency of the application scenario of the above example is lower than 100kHz, and the effective measurement range of this specific example is 100-1000A peak-to-peak current at a power frequency of 50Hz.

[0040] In this example, the TMR sensor is fixed at a distance from the innermost shield, at the center of the inner side of the innermost shield, and the distance is determined according to the specific design.

[0041] Such as figure 1 As shown, in this example, a nickel alloy shield is used, which is located near the magnetoresistive effect sensor. In a specific example, the magnetic shielding effect of the shielding layer structure composed of three layers of high magnetic permeability nickel alloy was tested.

[0042] In order to ensure the effectiveness of magnetic shielding, the above examples are first verified by finite element analysis in the electro...

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Abstract

The present invention discloses an electronic mutual inductor suitable for gas insulated substation large current measurement. The electronic mutual inductor adopts a tunnel magneto resistive (TMR) magnetic sensor, and by the structural design of the three-layer shielding layers which is characterized in that the size of the outermost shielding layer is greater than the sizes of the intermediate shielding layer and the innermost shielding layer, and the TMR magnetic sensor and an amplifying circuit are installed on a same printed circuit board and are located in an area composed of the cross-section arc and the cross-section arc chord of the innermost shielding layer, the three-layer shielding layers of the high-permeability materials shield the external magnetic field interference very well, at the same time, weaken a magnetic field of a current-carrying conductor, and the dynamic measurement range of the TMR magnetic field sensor is improved. Meanwhile, the electronic mutual inductor of the present invention can measure the fixed current-carrying conductor large current of a known distance in a non-contact manner, has the advantages of being wide in measurement range, accurate in result and low in cost, being simple and easy to install, etc., at the same time, does not have the problems brought by the complicated circuit of a conventional current measurement device by adopting the TMR magnetic field sensor and the simple amplifying circuit.

Description

technical field [0001] The invention belongs to the technical field of large current measurement, and more specifically relates to an electronic transformer suitable for large current measurement of a gas-insulated substation. Background technique [0002] Traditional large current measuring devices are based on the phenomenon of electromagnetic induction in coils, such as transformers and Rogowski coil current transformers. On the other hand, with breakthroughs in manufacturing process technology, linear magnetic sensors have undergone rapid development. Some commonly used linear magnetic sensors are in the form of integrated chips, and these linear sensors are mainly based on the Hall effect (Hall-effect magnetic sensor) or the magnetic field generated by the spin of electrons (spintronic sensor). [0003] Hall-effect magnetic sensors exhibit low sensitivity to the magnetic field in which they are applied, so flux concentrators are used for current measurement. [0004] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R15/18G01R19/00
CPCG01R15/18G01R19/0092G01R33/093G01R15/205G01R1/18G01R33/09
Inventor 黄琦赫瓦贾·阿尔萨兰·哈比卜陈亚锋井实李坚张真源易建波卢有亮
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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