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The vacuum interrupter is extensively employed in the medium voltage switchgear for the interruption of the short-circuit current. During the interruption process an arc is formed between the opening pair of the contacts. A metal shield is used to protect the ceramic from the metal vapours depositing on it during arcing. A voltage gets induced in the shield during the arcing process. The magnitude...
This paper discusses the arc flash ramifications associated with the design and selection of medium voltage switchgear. Arc flash hazard/risk categories are determined on the basis of the available bolted fault current at a particular location as well as the protective settings of upstream protective devices. In some instances, the NFPA 70E hazard/risk category (HRQ at medium voltage switchgear can...
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