Arc extinguishing in high-voltage ring main units (HV RMUs) refers to the elimination of electric sparks. The fundamental cause of arc generation in HV RMUs is that the contacts of switching devices and the medium surrounding the contacts contain a large number of ionizable electrons. When there is a sufficiently high applied voltage between the separating contacts and the circuit current reaches the minimum arcing current, intense ionization occurs, forming an arc.
So how do we solve the arc problem in HV RMUs? Today, we will discuss the typical arc extinguishing methods for HV RMUs. The commonly used arc extinguishing methods generally include the straight-line pressure gas type, rotary pressure gas type, rotating magnetic arc extinguishing, and arc chute arc extinguishing.
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