Dynamic Measurements on a Pulsed Short Arc Driven by a Magnetic Field

1973 ◽  
Vol 51 (14) ◽  
pp. 1499-1504 ◽  
Author(s):  
Michel G. Drouet ◽  
Rosario Beaudet
Keyword(s):  
Magnetic Field ◽  
Atmospheric Pressure ◽  
Streak Camera ◽  
Transverse Magnetic ◽  
Temporary Increase ◽  
Dynamic Measurements ◽  
Current Step ◽  
Arc Voltage ◽  
Arc Current ◽  
Short Arc

Current and voltage measurements were performed on a short (3 mm) arc burning at atmospheric pressure in air and driven (100–200 ms−1) along two rail electrodes by a transverse magnetic field. The arc current was pulsed from a steady state value of 40 A to 200–1000 A in < 10 μs. Simultaneous measurements revealed the arc voltage to be constant. On the contrary, a stationary arc, subjected to the same current step, showed a simultaneous temporary increase of the arc voltage of 10–40 V. To facilitate the interpretation of the results, the motion of the arc was recorded using a fast streak camera. It was found that, after applying the current step, the velocity of the arc does not change instantaneously, but that the luminous plasma expands in the wake of the arc. An interpretation of the results is proposed; it is based on the assumption that in a moving arc, the distributions of the current and the conductance are not similar.

scholarly journals Experimental Investigation of a Magnetically Balanced Arc in a Transverse Argon Flow

1966 ◽  
Vol 88 (1) ◽  
pp. 27-30 ◽  
Author(s):  
T. W. Myers ◽  
C. N. McKinnon ◽  
J. C. Lysen
Keyword(s):  
Magnetic Field ◽  
Experimental Study ◽  
Atmospheric Pressure ◽  
Gas Flow ◽  
Electric Arc ◽  
Test Apparatus ◽  
Gas Velocity ◽  
Argon Gas ◽  
Argon Flow ◽  
Arc Current

An experimental study of an electric arc in crossed convective and magnetic fields has been made. An electric arc was established across a rectangular test section through which argon gas was flowing at approximately atmospheric pressure and velocities up to 100 m/sec. Magnetic field strengths up to 3 webers/m2, oriented so that the Lorentz force opposed the convective force on the arc, were applied perpendicular to both the arc and the direction of the argon gas flow. The test apparatus and the procedure used to obtain the experimental relationship between the velocity of the argon flow and the balancing magnetic field are described. An analysis which assumed the magnetically balanced arc to be a gaseous cylinder positioned between the electrodes and with a diameter varying directly as the arc current satisfactorily explained the observed dependence of the balancing magnetic field on the gas velocity.

scholarly journals DC Current Interruption Based on Vacuum Arc Impacted by Ultra-Fast Transverse Magnetic Field

Energies ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4644
Author(s):  
Ehsan Hashemi ◽  
Kaveh Niayesh
Keyword(s):  
Magnetic Field ◽  
Transverse Magnetic Field ◽  
Transverse Magnetic ◽  
Vacuum Arc ◽  
Zero Crossing ◽  
Vacuum Interrupter ◽  
Novel Approach ◽  
Element Simulation ◽  
Arc Current ◽  
Dc Current

In this paper, the effect of an external ultrafast transverse magnetic field (UFTMF) on a vacuum arc in the diffused mode has been studied. According to the results of studies, a novel approach for making a zero-crossing in a DC arc current has been presented. Plasma voltage fluctuations of the vacuum arc, which are caused by UFTMF, have been investigated via finite element simulation and two-fluid description of plasma physics. By making an appropriate UFTMF through an external circuit, the arc current can be commuted successfully from the vacuum interrupter (VI) to a parallel capacitor and charge it up. In this way, a zero-crossing in the arc current can be achieved, and the current will be interrupted by the VI. Simulation results, which are supporting physical backgrounds for this analysis, have been presented in this paper while technological issues for industrial implementation of this concept have been discussed in detail.

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