Photographic Analysis of a Low-Current, Vacuum Electric Arc Using an Ultrafast Camera
Michał Lech, Paweł Węgierek
TL;DR
This paper uses ultrafast photography to study how low-current electric arcs behave in a vacuum, helping improve the design of vacuum interrupters.
Contribution
The study introduces time-lapse photographic analysis of low-current vacuum arcs using an ultra-high-speed camera and oscilloscope.
Findings
Vacuum arc voltage remains stable during the stable phase but increases during the unstable phase.
There is a correlation between arc voltage increases and flash intensity in the interelectrode space.
Microparticles ejected from contact surfaces were observed moving or adhering to electrodes.
Abstract
The main component of vacuum interrupters responsible for ensuring the correct flow of current is the contact system. In a vacuum environment, due to the higher values of the mean free path of electrons and particles in the contact gap, the material and condition of the contacts exert the greatest influence on the development of the arc discharge. To accurately analyze the phenomenon of discharge development in vacuum insulating systems, the authors conducted a time-lapse photographic analysis of a vacuum electric arc. For this purpose, they used a test setup comprising a discharge chamber, a vacuum pump set, a power and load assembly, an ultra-high-speed camera, and an oscilloscope with dedicated probes. The measurement process involved connecting the system, determining the power supply, load, and measurement parameters and subsequently performing contact opening operations while…
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Taxonomy
TopicsVacuum and Plasma Arcs · Advanced Sensor Technologies Research · Electrical Fault Detection and Protection