This video explains what happens when you break a circuit in HV and how to prevent the arc from reestablishing itself in different insulating media.
Breaking an electrical distribution or transport network permits the isolation of part of the network from the rest of it. In the high voltage field, separating the contacts is not enough to break the current instantly.
When the contacts separate, the current continues to flow and a temporary electric arc forms between the moving and fixed contacts. To extinguish the arc, the arcing current must become zero and stay at zero. By varying the opening speed and the distance between contacts, the power and duration of the electric arc are greatly affected.
Sufficient contact spacing for certain insulating media helps a lot in cooling and extinguishing the arc.
Length: 9mn 43s
Topic : Electrical circuit breaking principles