Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1983-05-09
1986-03-11
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular system function
340505, 340518, 340525, 340538, 340310R, G08B 2900, G08B 2600
Patent
active
045757100
ABSTRACT:
An automatic testing system for testing the operability of transmission line carrier units using timers that periodically activate a signal for energizing local carrier unit transmitters with a delayed energization of local carrier unit receivers, and a signal stepping circuit that connects the transmitter and receiver signal sequentially to the carrier units in a series of transmission lines. The absence of a signal being received by the local carrier unit receiver indicating a fault that is detected in latches that provide an indication of the carrier in which the fault has occurred and an indication at a remote computer when there has been at least one failure in the testing sequence, which failure indication remains activated at the end of a testing sequence to assure attention by the operator. The sequencing occurs automatically with a capacitor-delayed spike signal that provides sufficient time for the indication of the absence of a signal without requiring separate circuitry.
REFERENCES:
patent: 3516063 (1970-06-01), Arkin et al.
patent: 3634824 (1972-01-01), Zinn et al.
patent: 3735396 (1973-05-01), Getchell
patent: 3806872 (1974-04-01), Odom
patent: 3927404 (1975-12-01), Cooper
"Programmable Power Line Carrier Blocking Relay Channel", F. T. Shannon, Mar., 1981; G.E. Pub.
"Power Line Carrier Teleprotection Channel Equipment", G.E. Publication, 1980.
Crosland Donnie L.
Duke Power Company
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