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Method and system for testing magnetic shielding of current transformer by using three-dimensional magnetic field

A current transformer and testing current technology, applied in the measurement of electrical variables, electromagnetic field characteristics, instruments, etc., can solve the problems of human error, inability to simulate spherical magnetic field source, inability to quickly and accurately measure the shielding effect, etc., to improve the accuracy of measurement sexual effect

Active Publication Date: 2016-02-03
ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, when measuring the magnetic shielding effect, most of the magnetic field sources in one direction do not have gyromagnetic characteristics, and cannot simulate a spherical magnetic field source. It is necessary to manually change the direction to test the various directions of the shielding box. The shielding effect cannot be measured quickly and accurately. It consumes a lot of labor costs and adds a large human error
[0003] At present, no three-dimensional rotating magnetic field has been applied to the measurement of the magnetic shielding effectiveness of current transformers (current sensors).

Method used

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  • Method and system for testing magnetic shielding of current transformer by using three-dimensional magnetic field
  • Method and system for testing magnetic shielding of current transformer by using three-dimensional magnetic field
  • Method and system for testing magnetic shielding of current transformer by using three-dimensional magnetic field

Examples

Experimental program
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Effect test

Embodiment 1

[0039] combine figure 1 and Image 6 As shown in the figure, the magnetic shielding effect of the current transformer is tested, and the computer controls the excitation device (excitation source) through the RS232 line to generate I x , I y , I z Respectively connected to the binding posts of the magnetic field generator, the current I x , I y , I z Enter the respective excitation coils to generate a three-dimensional rotating magnetic field. When the space magnetic field scans the current transformer in all directions, the secondary winding of the current transformer is N. 2 The induced current ΔI is generated. After ΔI passes through the I / V converter, the induced voltage ΔU is measured and read by a millivolt meter (mV meter), and its magnetic shielding effect SE is calculated, which reflects the shielding effect of the current transformer shielding box. in:

[0040] ΔU=ΔI×R, S E = Δ U ...

Embodiment 2

[0044] combine image 3 and Figure 7 As shown in the figure, the magnetic shielding effect of the current sensor is tested, and the computer controls the excitation device (excitation source) through the RS232 line to generate I x , I y , I z Respectively connected to the binding posts of the magnetic field generator, the current I x , I y , I z Enter the respective excitation coils to generate a three-dimensional rotating magnetic field. When the space magnetic field scans the current sensor in all directions, the secondary winding of the current sensor N 2 The induced voltage is generated. After the induced voltage passes through the V / V converter, the induced voltage ΔU is measured and read by a millivolt meter (mV meter), and the magnetic shielding effect SE of the current sensor is calculated. Condition I x , I y , I z The amplitude of , produces different spherical magnetic fields H, and the system measures different induced voltages ΔU 1 , calculate the SE in...

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Abstract

The invention belongs to the technical field of power equipment detection and application and specifically relates to a method and system for testing the magnetic shielding of a current transformer by using a three-dimensional magnetic field. Current Ix, Iy, and Iz applied by an excitation source enter three exciting windings of a magnetic field generator to generate three orthogonal magnetic fields Hx, Hy, Hz. The Hx, Hy, Hz form spatial spherical magnetic fields H with different radiuses in order to scan the current transformer or a current sensor, measure an inductive signal generated by the secondary winding of the current transformer or the current sensor, and compute the magnetic shielding effect of the current transformer or the current sensor. The method provides basis for the shielding material selection and structural design of the current transformer or the current sensor, has guiding significance to the internal layout and quality control of an electric energy meter, and achieves a purpose of improving the metering accuracy of the electric energy meter.

Description

technical field [0001] The invention belongs to the technical field of space magnetic field detection, and in particular relates to a method and a system for testing the magnetic shielding of a current transformer by using a three-dimensional magnetic field. Background technique [0002] Electric energy meter is a commonly used electric measuring instrument in electric power enterprises, and it is a measuring instrument for compulsory verification trade settlement stipulated in the "Measuring Law". The International Organization for Legal Metrology (OIML) formulated R46 to put forward higher requirements for the diamagnetic shielding of electric energy meters. It stipulates that the influence of 400A / m power frequency magnetic field interference on electric energy errors cannot exceed a certain range. The important components of electric energy meters are the current transformer ( Current sensors) are more sensitive to alternating magnetic fields, and will produce large erro...

Claims

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Application Information

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IPC IPC(8): G01R35/02G01R29/08
Inventor 李刚唐利涛龙东李伟坚蒋雯倩杨舟梁捷潘俊涛
Owner ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD
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