Electrically heated vacuum furnace with a fault detection system

Details Electrically heated vacuum furnace with a fault detection system Electrically heated vacuum furnace with a fault detection system

1982-05-14

1983-09-06

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

219499, 307231, 361 92, 361182, 361187, H02H 316

Patent

active

044032676

ABSTRACT:
An electrically heated vacuum furnace is described as having a fault detection system which has the ability to sense among other things, carbon arc buildup, a load touching a heating element, short circuits from broken heating elements, and short circuits in any heating element connection whether it be single phase, three phase delta or three phase wye connections. The system essentially comprises an electrically balanced wheatstone bridge which is in a main circuit in parallel with the electric heating element and the grounded casing of the furnace. A switching mechanism maintains the circuit in a normally open condition. A timer is provided to periodically disrupt the flow of electric current to the electric heating element in the furnace. The switching mechanism will be operated to close the circuit if the circuit is free of electric current. Should any of the aforementioned faults occur, the bridge will be thrown out of balance so that there will be a small leakage of current which is detected and utilized in the shutting down of the furnace in cases where the fault is severe and necessitates stopping the operation of the furnace.

REFERENCES:
patent: 2832916 (1958-04-01), Kennedy
patent: 3234316 (1966-02-01), Mathews
patent: 3959692 (1976-05-01), Wetzel
patent: 3992636 (1976-11-01), Kiffmeyer
patent: 4159501 (1979-06-01), White

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