Overcurrent relays
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Mar 23, 1982
Grant Date -
N/A
app pub date -
Aug 2, 1979
filing date -
Aug 9, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A time relay comprising a device (1) arranged to produce an output (F) having a frequency representative of a parameter (I) to be monitored, a comparator (5) responsive to the output (F) for producing an output (IN) when the value of the monitored parameter exceeds a setting value, and relay operating circuitry for operating the relay when the comparator produces an output for a time determined by the relay characteristic for the value of the monitored parameter. The device is suitably a Carrier Domain Magnetometer (C.D.M.) and the operating circuitry suitably includes a digitally addressable memory (8) in which the relay characteristic is stored.
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