The contacts of high voltage switches used in power system are submerged in oil. The main purpose of the oil is to______________?
Correct answer: C. extinguish the arc
- A. lubricate the contacts
- B. insulate the contacts from switch body
- C. extinguish the arc
- D. all of the above
- E. none of the above
Explanation
When high-voltage switch contacts separate, an arc forms between them; the oil cools and deionises the arc path, helping extinguish it. Although oil also provides insulation, arc extinction is its main purpose here.
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