HV Exit Exam • Set 6 Question 9 of 30

Which of the following circuit breaker technologies is most widely preferred for Extra High Voltage (EHV/UHV) grid transmission substations?

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Direct Answer

Option D: SF6 gas circuit breaker

SF6 puffer and self-blast circuit breakers dominate EHV applications (72.5 kV to 800 kV) due to their compact footprint, high interrupting capacity, and rapid dielectric recovery.

All Options

Bulk oil circuit breaker

Air break circuit breaker

Minimum oil circuit breaker

SF6 gas circuit breaker (Correct Answer)

Detailed Explanation & Context

SF6 puffer and self-blast circuit breakers dominate EHV applications (72.5 kV to 800 kV) due to their compact footprint, high interrupting capacity, and rapid dielectric recovery.

Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • High Voltage Safety Officer & Switchgear Operations (HV).

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