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Excitation device with longitudinal magnetic field for medium-frequency current test system

A technology of longitudinal magnetic field and intermediate frequency current, which is applied in the direction of high voltage/high current switch, circuit, electric switch, etc., and can solve the problem that the influence of magnetic field change on arc cannot be analyzed.

Active Publication Date: 2014-12-17
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once the structure of the switch contacts of the vacuum interrupter VI is determined, the magnetic field strength will not change under the same current, and the influence of the magnetic field change on the arc cannot be analyzed

Method used

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  • Excitation device with longitudinal magnetic field for medium-frequency current test system
  • Excitation device with longitudinal magnetic field for medium-frequency current test system
  • Excitation device with longitudinal magnetic field for medium-frequency current test system

Examples

Experimental program
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Effect test

Embodiment 1

[0056] The current frequency is 400Hz, and a current transformer is set. Then the relationship between the voltage and the experimental time is as follows: Figure 4 shown. In the figure, the ordinate is the shunt R 2 The voltage at both ends of , and the abscissa is the experimental time. The peak value of the first half wave of the primary current is 11.3kA, which is the shunt R 2 The voltage value across the shunt divided by the R 2 The resistance value is 1.2mΩ.

[0057] The relationship between the magnetic induction intensity of the longitudinal magnetic field and the experimental time is as follows: Figure 4A shown. In the figure, the ordinate is the magnetic induction intensity of the longitudinal magnetic field at the axis center of the Helmholtz coil, and the abscissa is the experiment time. The peak value of the first half wave is 46.1mT.

Embodiment 2

[0059] The current frequency is 400Hz, and two current transformers are set. Then the relationship between the voltage and the experimental time is as follows: Figure 5 shown. In the figure, the ordinate is the shunt R 2 The voltage at both ends of , and the abscissa is the experimental time. The peak value of the first half wave of the primary current is 10.7kA, which is the shunt R 2 The voltage value across the shunt divided by the R 2 The resistance value is 1.2mΩ.

[0060] The relationship between the magnetic induction intensity of the longitudinal magnetic field and the experimental time is as follows: Figure 5A shown. In the figure, the ordinate is the magnetic induction intensity of the longitudinal magnetic field at the center of the Helmholtz coil axis, and the abscissa is the experiment time. The peak value of the first half wave is 87.2mT.

Embodiment 3

[0062] The current frequency is 800Hz, and 6 current transformers are set. Then the relationship between the voltage and the experimental time is as follows: Figure 6 shown. In the figure, the ordinate is the shunt R 2 The voltage at both ends of , and the abscissa is the experimental time. The peak value of the first half wave of the primary current is 15.9kA, which is the shunt R 2 The voltage value across the shunt divided by the R 2 The resistance value is 1.2mΩ.

[0063] The relationship between the magnetic induction intensity of the longitudinal magnetic field and the experimental time is as follows: Figure 6A shown. In the figure, the ordinate is the magnetic induction intensity of the longitudinal magnetic field at the center of the Helmholtz coil axis, and the abscissa is the experiment time. The peak value of the first half wave is 395.8mT.

[0064] Optimizing the Contact Structure of Vacuum Interrupter

[0065] The medium-frequency vacuum arc experiment ...

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Abstract

The invention discloses an excitation device with a longitudinal magnetic field for a medium-frequency current test system. According to the excitation device, an adjustable longitudinal magnetic field is generated at a contact of a flat-plate switch of a vacuum arc-extinguishing chamber while phase equalization of the adjustable longitudinal magnetic field and a longitudinal magnetic field which is generated at a switch contact of the other vacuum arc-extinguishing chamber is guaranteed. The excitation device utilizes the technical means of winding a Helmholtz coil around the contact of the flat-plate switch of the vacuum arc-extinguishing chamber, collecting current of an adjustable magnetic field oscillation circuit by one or multiple current transformers, and taking secondary current as excitation current so as to generate the adjustable magnetic field. By the excitation device with the longitudinal magnetic field for the medium-frequency current test system, the medium-frequency current test system can be used for implementing research on medium-frequency vacuum arc characteristics in the adjustable magnetic field of the same phase with the longitudinal magnetic field.

Description

technical field [0001] The present invention relates to a medium-frequency current experiment system, more particularly, to an excitation device for a longitudinal magnetic field of the medium-frequency current experiment system. The longitudinal magnetic field is applied to the switch contacts of the vacuum interrupter through the excitation device, and the characteristics of the intermediate frequency vacuum arc are studied. Background technique [0002] On September 5, 2009, Volume 29, Issue 25, "Proceedings of the Chinese Society for Electrical Engineering" published "Experimental Research on Intermediate Frequency Vacuum Arc under Longitudinal Magnetic Field", authored by Wang Jing and Wu Jianwen. exist figure 1 Introduced in the medium frequency current experiment system, the capacitor C 1 , bidirectional thyristor VT 1 , inductance L 1 , vacuum interrupter VI, shunt R 2 Form the oscillation circuit, the electrolytic capacitor C 2 , power diode VD 1 , current li...

Claims

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Application Information

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IPC IPC(8): H01H33/664
Inventor 武建文蒋原唐伟
Owner BEIHANG UNIV
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