Appeal No. 97-1171
Application 08/488,171
compared with the amount of power flowing out of power output
terminals to determine a difference between the two amounts of
power. An activation signal is produced when the difference
between the two amounts of power is greater than a
predetermined amount.
Claim 3 is illustrative of the claimed invention, and it
reads as follows:
3. In a system conditionally operative to transmit
electric power from a source to a remote load; the source
including a circuit breaker having an activation input and
being responsive on receipt of an activation signal to prevent
the source from supplying electric power; the improvement
comprising:
first sensor associated with the source and operative to
provide a first signal indicative of the amount of power
supplied from the source;
second sensor associated with the load and operative to
provide a second signal indicative of the amount of power
being received by the load; and
an electronic circuit connected by way of a communication
path with each of said sensors; the electronic circuit having
an activation output connected with the activation input and
being operable to provide said activation signal in response
to a predetermined minimum difference in the amount of power
supplied by source and that received by said load.
The references relied on by the examiner are:
Staad et al. (Staad) 3,764,883 Oct. 9, 1973
Bereskin 4,159,499 June 26, 1979
Mason, “Protective Relaying,” John Wiley & Sons, Inc., 1956,
pages 63 through 69, 287 and 288.
2
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