HV Exit Exam • Set 7 Question 23 of 30
Which of the following is NOT an established method of arc extinction in electrical circuit breakers?
✓
Direct Answer
Option C: Insertion of silicon diode rectifiers into the arc column
Arc extinction methods include lengthening the arc, magnetic blowout, blast cooling (air/SF6/oil), arc chute splitting, and vacuum deionization. Diode rectifiers cannot be inserted into an open plasma arc.
All Options
A
Oil immersion and gas blasting of contacts
B
Magnetic blowout coils and arc splitters
C
Insertion of silicon diode rectifiers into the arc column
(Correct Answer)
D
De-ionization and lengthening of the arc path
Detailed Explanation & Context
Arc extinction methods include lengthening the arc, magnetic blowout, blast cooling (air/SF6/oil), arc chute splitting, and vacuum deionization. Diode rectifiers cannot be inserted into an open plasma arc.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • High Voltage Safety Officer & Switchgear Operations (HV).
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