H - Electricity – 02 – J
Patent
H - Electricity
02
J
348/17, 324/38
H02J 3/04 (2006.01) G01R 23/15 (2006.01) H02J 9/06 (2006.01)
Patent
CA 1072197
46,671 AUTOMATIC TRANSFER CONTROL DEVICE AND FREQUENCY MONITOR ABSTRACT OF THE DISCLOSURE An atuomatic transfer control device for generating signals to cause associated circuit interrup- ters 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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