H - Electricity – 02 – H
Patent
H - Electricity
02
H
309/82
H02H 1/06 (2006.01) H02H 11/00 (2006.01) H05B 1/02 (2006.01) H05B 3/76 (2006.01)
Patent
CA 1176676
9D-RG-14742-Payne/Chou PROTECTIVE METHOD AND CIRCUIT ARRANGEMENT FOR APPLIANCE INCORPORATING SHEATHED HEATING ELEMENT ABSTRACT OF THE DISCLOSURE A protective control arrangement for heating units of the type comprising the concentric assembly of a resistance heating element embedded in an insulating material and enclosed within a metallic sheath for limit- ing the propagation of a rupture in the sheath resulting from an arc at a discontinuity in the heating element along a substantial portion of the length of the sheath. The control arrangement of the illustrative embodi- ment includes a power control triac operatively connected to the heating element for selectively coupling the heating element to an external power supply. A preprogrammed microprocessor operatively connected to the gate terminal of the triac is effective to periodically interrupt power to the heating element by opening the switch means for interrupt periods of pne- determined duration. The time between successive ones of these interrupt periods is determined such that extinction of any arc which may develop at a discontinuity in the heating element occurs before any resultant separation can propagate along a substantial portion of the sheath; and the duration of each of these interrupt periods is at least approximately equal to the nominal recovery time for the insulating material required to allow the insulating material to return from its relatively low resis- tance molten and plasma state to its relatively high resistance state. By periodically interrupting energization of the heating unit in this manner, any arc which occurs is extinguished by the next occurring inter- rupt period.
419128
Chou Robert V.
Payne Thomas R.
Eckersley Raymond A.
General Electric Compnyy
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