Automatic testing of carrier relay equipment in electrical power

Details Automatic testing of carrier relay equipment in electrical power Automatic testing of carrier relay equipment in electrical power

1981-09-15

1984-06-26

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

With particular system function

340527, 340505, 371 22, 178 69G, 1791753R, G08B 2900

Patent

active

044569068

ABSTRACT:
In an electrical power transmission system, transmitter-receiver pairs at stations which communicate with similar pairs at other stations to block tripping of circuit breakers or for other control functions are periodically tested. An electrical circuit periodically activates a transmitter to send a test signal from a first station over a power line to a receiver at another station in the system. The receiver at the other station activates the associated transmitter in response to receipt of the incoming signal to send a signal back to the receiver of the first station. If this cycle is not completed in a specified time, indicating loss of communication between the two transmitter-receiver pairs, an alarm is activated.

REFERENCES:
patent: 477712 (1892-06-01), Stromberg
patent: 1394642 (1921-10-01), Quass
patent: 3133275 (1964-05-01), Cohrt et al.
patent: 3955183 (1976-05-01), McBrian
patent: 3970940 (1976-07-01), Venn
patent: 3991362 (1976-11-01), Blair et al.
patent: 4032909 (1977-06-01), Boyce
patent: 4044351 (1977-08-01), Everson
Wayne Electronic Products Company, Oklahoma City, Oklahoma, WEPCO Test Equipment T-200 Manual, 1968.
Magcon Engineering Company, St. Paul, Minnesota, Carrier Check Slave CS-30 Instruction Manual, approx. 1972.

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