Electrical switchgear of the rotating arc, double-break type
AssigneeSouth Wales Switchgear Limited
InventorJohn Parry
Life of this patent
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Abstract
Electrical switchgear comprises a pair of contact arms which, in a contacts closed position, engage the ends of a main contact bar. Upon movement of the electrical switchgear towards a contacts open position, the contact bar disengages from the contact arms and an arc is drawn between each contact arm and a respective arcing electrode. A common field coil has its ends electrically connected to the arcing electrodes respectively, such that the arcing current flows through the field coil to create a magnetic field which causes the arcs to rotate and become extinguished. An insulating barrier separates the electrodes to prevent the arc from being transferred directly across the contact arms.
Claims20
Electrical switchgear comprising a contact set composed of a pair of first contact means, second contact means, and moving means operative to move said contact set between a closed position in which said second contact means is engaged with said pair of first contact means and an open position in which said second contact means is disengaged from said pair of first contact means, a field coil located between and common to said pair of first contact means, said common field coil having a pair of terminal connections and an axis, and a pair of arcing electrodes electrically connected to said terminal connections of said common field coil respectively, each of said pair of first contact means forming a respective arc to a respective one of said arcing electrodes when said moving means is operated to move said contact set from said closed position to said open position, a current flowing through said common field coil produced by said arcs creating a magnetic field which causes said arcs to rotate and become extinguished, said common field coil being electrically isolated from said first contact means in said open position of said contact set.
Dependencies are inferred from the claim text.