Remotely-controllable relays and filters therefor

Details Remotely-controllable relays and filters therefor Remotely-controllable relays and filters therefor

1978-05-12

1980-11-04

Yusko, Donald J.

Communications: electrical

Digital comparator systems

324 79R, 328134, 340310R, G01R 2302, H03K 906, H04Q 910

Patent

active

042322987

ABSTRACT:
A remotely-controllable relay which is controlled by 175 Hz ripple voltage superimposed on the mains supply voltage in an electric-power distribution network contains an oscillator generating a signal at 173 Hz. This is mixed with the network voltage so that, when ripple voltage is present, a beat note at a frequency of 2 to 3 Hz is generated. This beat note is separated from the unwanted signals, such as the mains supply voltage, by a third order active low-pass filter to control operation of the relay. A similar technique provides simplified detection of output signals from correlation-type filters.

REFERENCES:
patent: 3636446 (1972-01-01), Genter et al.
patent: 3659212 (1972-04-01), Saliga
patent: 3681689 (1972-08-01), Correard et al.
patent: 3693081 (1972-09-01), Aviander
patent: 3852722 (1974-12-01), Neuville
patent: 3876951 (1975-04-01), McLean et al.
patent: 4017801 (1977-04-01), Riedel
patent: 4021653 (1977-05-01), Sharp et al.
patent: 4127824 (1978-11-01), Bennett,Jr.
Kidd, "Development, Design and Use of Ripple Control," Proc. IEE, vol. 122, No. 10R, Oct. 1975, IEE Reviews.

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