The contacts of high voltage switches used in power system are submerged in oil. The main purpose of the oil is to
A)lubricate the contacts
B)insulate the contacts from switch body
C)extinguish the arc
D)all of the above

Question

Quizplus · Accepted Answer

The main purpose of submerging the contacts of high voltage switches in oil is to extinguish the arc that forms when the contacts are separated. The oil acts as an arc quencher, cooling and isolating the arc to prevent it from sustaining.

The Contacts of High Voltage Switches Used in Power System