Automatic transfer control device and frequency monitor

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 4231029
SERIAL NO

05881926

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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An automatic transfer control device for generating signals to cause associated circuit interrupters to selectively energize an electrical distribution system from either of a pair of electrical power sources. The device includes an over- and under-frequency monitoring circuit to determine if the power source frequency is within preset limits. The frequency monitoring circuit includes a zero-crossing detector which activates a clock oscillator, the output pulses of which are accumulated by a counter for one half cycle. The number of pulses occurring during the half cycle is compared with a limit value stored in a read-only memory. An alarm signal is activated if the number of pulses accumulated is out of limits. The address inputs of the read-only memory are connected to the alarm signal generator and to a flip-flop toggled by the zero-crossing detector so that any of four limit values are selectively accessed for input to the comparator: high limit, low limit, return-to-normal after high alarm, and return-to-normal after low alarm. A strobe circuit is provided to only momentarily energize the read-only memory, thereby reducing power consumption.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
WESTINGHOUSE ELECTRIC CORPORATIONPITTSBURGH, PA545

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Johnston, Paul M Hempfield Township, Westmoreland County, PA 7 204

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Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
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Other [Check patent profile for assignment information] (2)
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* Cited By Examiner