Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1989-09-25
1991-02-26
Orsino, Joseph A.
Communications: electrical
Condition responsive indicating system
Specific condition
330 2, 322 99, G08B 2100
Patent
active
049965190
ABSTRACT:
A method and apparatus for enabling the continuous monitoring of the operational state of circuit components includes a scheme for generating a plurality of voltage signals representing neutral-to-line voltages of the system and adding to each of those signals a second signal, each second signal being identical. This addition is done vectorially to yield a modified signal. A representation of the modified signal as acted upon by the circuit to be monitored is compared with a representation of the neutral-to-line voltage signal to yield an output signal representative of the operational state of the circuit components.
REFERENCES:
patent: 3434065 (1969-03-01), Chu et al.
patent: 3718857 (1973-02-01), Bernard
patent: 4454503 (1984-06-01), Nelson et al.
patent: 4855644 (1989-08-01), Lane
D'Antonio Michael J.
Gibbs Irving A.
Lane Lawrence J.
Lawson Rodney A.
General Electric Company
Jackson Jill
Orsino Joseph A.
Renner Arnold E.
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