HV Exit Exam • Set 4 Question 2 of 30
In a high-voltage circuit breaker, ionization of the contact gap medium is facilitated by:
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Direct Answer
Option D: All of the above
Ionization between breaker contacts during contact separation is enhanced by high electric field gradients (voltage stress), thermal excitation at high temperatures, and longer electron mean free paths.
All Options
A
Increase in electric field strength across the gap
B
Increase in mean free path of electrons
C
High temperature of the surrounding dielectric medium
D
All of the above
(Correct Answer)
Detailed Explanation & Context
Ionization between breaker contacts during contact separation is enhanced by high electric field gradients (voltage stress), thermal excitation at high temperatures, and longer electron mean free paths.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • High Voltage Safety Officer & Switchgear Operations (HV).
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