Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific quantity comparison means
Patent
1982-04-05
1984-05-01
Moose, Jr., Harry E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific quantity comparison means
361 96, H02H 308
Patent
active
044464983
ABSTRACT:
A control is provided for an AC circuit protection system or the like which is capable of monitoring either single phase or polyphase current flow. The composite current is periodically sampled at a frequency f.sub.s which is not a harmonic frequency of circuit current. The current sample values are converted into digital form and processed, then stored in an accumulator stage. When an overcurrent condition occurs the accumulator stage overflows and trips a circuit interrupter.
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General Electric Lod-Trols II Solid State Motor Protection Instructions pp. 58-60 Aug. 79.
"Analog to Digital Conversion Techniques with COPS Family Microcontrollers" National Semiconductor Co. 2/80.
James John L.
Moose Jr. Harry E.
Siemens-Allis, Inc.
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