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In EHV Circuit Breakers, what are the arc quenching meduim used other that SF6 Gas?

Engineering Electrical Electrical Maintenance Transformer
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Question added by Jerry Victor , Technical Pre-Sales Engineer , Al Mazroui ICAS LLC
Date Posted: 2016/04/28
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Gopal Manda
by Gopal Manda , Sr. Engineer Utilities , Cusman & Wakefield India Pvt. Ltd.

Air blast Circuit breaker is appropriate for EHV.   

Vasile Alexandru
by Vasile Alexandru , Maintenance Electrical Engineer , Dietsmann (for BP Iraq)

could be vacuum, oil; however SF6 is the best

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