CIRCUIT INTERRUPTER WITH DIGITAL TRIP UNIT AND POWER SUPPLY

A circuit breaker includes a microprocessor-based trip unit and a power supply for supplying operating power to the trip unit and the trip coil of the circuit breaker from either the internal current transformers of the circuit breaker or a plurality of external sources. The trip unit includes a num...

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Bibliographic Details
Main Authors JOSEPH C. ENGEL, GARY F. SALETTA, ROBERT T. ELMS, JOHN A. WAFER
Format Patent
LanguageEnglish
Published 18.09.1986
Edition3
Subjects
CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
ELECTRICITY
EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
GENERATION
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Summary:A circuit breaker includes a microprocessor-based trip unit and a power supply for supplying operating power to the trip unit and the trip coil of the circuit breaker from either the internal current transformers of the circuit breaker or a plurality of external sources. The trip unit includes a numeric display for displaying a sequential series of parameter values under normal conditions. Under low-power conditions, the power supply provides pulses of operating power sufficient to enable the trip unit to execute all of its limit check functions and present a flashing display of a single parameter value.
Bibliography:Application Number: PH19810025415