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In order to improve the breaking capacity of contacts, it is very important to find a better contact material. In this paper, the triggering experiments of plate contact with different material are studied to investigate the characteristics of vacuum arc. The current range is from 1kA to 9kA (rms). The gap distance is 3mm and 5mm. The arc appearance and the behavior of cathode spots are captured by...
Using magnetic fields to control the vacuum arc is a major way to improve the breaking capacity of vacuum interrupters. Besides the single transverse magnetic field (TMF) and single axial magnetic field (AMF), new type of TMF-AMF contact structure has been put forward to control the vacuum arc in recent years. In this paper, two different structure contacts are used in experiments. The arc evolution...
In this paper, a 3D model for vacuum arc controlled by transverse magnetic field (TMF) is built and simulation on its parameters is calculated. In the simulation, only the external TMF is taken into consideration and arc is assumed to contracts itself. Arc is not neutral so that ions and electrons are calculated respectively. According to the simulation results, both ions and electrons are deflected...
A series of triggering experiments were carried out to investigate into the characteristics of vacuum arc controlled by TMF-AMF contacts. During the whole experiments, current ranged from 5kA to 20kA (rms) and both arc appearance and the behavior of cathode spots were captured by high-speed camera with corresponding arc current and arc voltage. A 3D steady MHD model was built to simulate and analyze...
Vacuum arc is usually driven to rotate and deflect by transverse magnetic field (TMF). This paper presents the 2D simulation results of vacuum arc controlled by external transverse magnetic field based on the magneto-hydro-dynamic (MHD) model. It is assumed that anode and cathode spots only occupy a small part of contact area for arc maintains a constricted status under TMF. In the simulation, external...
In this paper, high-current vacuum arc (VA) breaking experiments in vacuum interrupters were conducted using two kinds of high-capacity (larger diameter) axial magnetic field (AMF) electrodes with contact gap distance changing from 10 to 40 mm. Triggering arc mode and fixed gap distance were adopted. Experimental results showed that during the initial diffusion stage, the arc voltage of high-current...
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