Registers – Transfer mechanism – Traveling pawl
Patent
1975-11-28
1977-04-19
Morrison, Malcolm A.
Registers
Transfer mechanism
Traveling pawl
2351503, 324 91, 328133, G06G 748, G01R 2500
Patent
active
040190390
ABSTRACT:
This invention relates to a system for simulating a power plant synchroscope in which a digital computer supplies the information which indicates when two alternators are, or are not, in synchronism. Digital words are supplied by the computer to two separate registers whose parallel outputs are applied to the inputs of two separate frequency multipliers, one for each register. A single oscillator supplies its output to the second inputs of both of the multiplier, and the frequency of the oscillator is therein multiplied by the value of the words from the computer. The outputs from the two multipliers are supplied to two separate channels, one representing each of the two alternators. The square waves in each channel are converted into sine waves which are then applied to the incoming and running windings of a standard synchroscope. In addition, the information in the two channels is applied to the inputs of a phase difference detector which produces a digital phase difference.
REFERENCES:
patent: 691834 (1902-01-01), Woodbridge
patent: 2358439 (1944-09-01), Blok
patent: 2927735 (1960-03-01), Scuitto
patent: 3184663 (1965-05-01), Mergler
Spencer, James; "Operation and Care of Circular-Scale Instruments;" Instruments; vol. 21, pp. 1016-1019.
Kesterson James C.
Krass Errol A.
Morrison Malcolm A.
Reichman Ronald
The Singer Company
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