Electrical apparatus

Details Electrical apparatus Electrical apparatus

1985-11-19

1987-12-15

Rowland, James L.

Communications: electrical

Condition responsive indicating system

Specific condition

340645, 340512, 324500, G08B 2100

Patent

active

047136529

ABSTRACT:
An electrical apparatus for monitoring electrical continuity includes a number of input circuits each associated with a respective arm of a multi-phase rectifier circuit the continuity of which is to be monitored. Each input circuit includes a comparator which generates a train of pulses P while an input current persists in the arm. If a discontinuity arises in an arm for a first preset interval of time a monostable in that arm generates a first trigger signal. If the discontinuity persists for a further preset interval of time another monostable, common to all the arms, triggers an alarm via a bistable circuit.

REFERENCES:
patent: 3293605 (1966-12-01), Moore
patent: 3665461 (1972-05-01), Gnagi
patent: 3688293 (1972-08-01), Sullivan
patent: 3806906 (1974-04-01), Young
patent: 4222037 (1980-09-01), Schaap et al.
patent: 4604607 (1986-08-01), Sanderford, Jr. et al.

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