Electricity: circuit makers and breakers – Liquid contact – Time delay
Patent
1982-01-27
1983-10-11
Macon, Robert S.
Electricity: circuit makers and breakers
Liquid contact
Time delay
200148R, H01H 3318
Patent
active
044094469
ABSTRACT:
A first contact has an end portion which engages a second contact in a contacts closed position of the switchgear and which moves transversely across a pole face of a field coil and inwardly of an axis of the latter during movement of the contacts to an open position. The field coil is electrically connected in series with an arcing electrode and to which the second contact is also connected. Upon movement of the contacts from their closed position to their open position, an arc is drawn between the end portion of the first contact and a portion of the second contact. Further movement of the contacts towards their open position causes the arc to transfer its root from the second contact portion to the arcing electrode so that an arcing current then flows through the field coil to generate a magnetic field which causes the arc to rotate and become extinguished. Extinction of the arc is assisted by an electrically insulating fluid surrounding the switchgear. A principal arcing zone is defined by rotation of the arc, and the arc is disposed in this zone when it transfers its root from the second contact to the arcing electrode so that it can rotate immediately under the influence of the magnetic field.
REFERENCES:
patent: 4301340 (1981-11-01), Parry
patent: 4301341 (1981-11-01), Parry
Brown Charles E.
Macon Robert S.
South Wales Switchgear Limited
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