What medium is commonly used inside modern High Voltage marine circuit breakers for arc quenching?
Direct Answer
Option C: Vacuum (VCB) or Sulfur Hexafluoride gas (SF6)
Modern marine switchgear utilizes vacuum or SF6 gas to extinguish arcs rapidly. Vacuum circuit breakers (VCB) prevent arc restrike by eliminating the medium for ionization, while SF6 gas provides superior dielectric strength and arc-quenching properties, ensuring safe interruption of high-energy fault currents within compact shipboard switchboard designs.
All Options
Detailed Explanation & Context
Modern marine switchgear utilizes vacuum or SF6 gas to extinguish arcs rapidly. Vacuum circuit breakers (VCB) prevent arc restrike by eliminating the medium for ionization, while SF6 gas provides superior dielectric strength and arc-quenching properties, ensuring safe interruption of high-energy fault currents within compact shipboard switchboard designs.
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • High Voltage Safety Officer & Switchgear Operations (HV).
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