Electronic trip unit with dedicated override current sensor

An electronic trip unit for a circuit breaker (10) having two current sensors (16 and 17) per phase, wherein the first magnetic core current transformer (16) is designed to monitor current in the normal and overcurrent range, and the second low-permeability core sensor (17) is designed to produce an...

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Bibliographic Details
Main Authors JOHNSON, RICHARD ARTHUR, JONES, WILLIAM JOHN
Format Patent
LanguageEnglish
French
German
Published 14.07.1999
Edition6
Subjects
BASIC ELECTRIC ELEMENTS
CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
ELECTRICITY
EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
GENERATION
INDUCTANCES
MAGNETS
MEASURING
MEASURING ELECTRIC VARIABLES
MEASURING MAGNETIC VARIABLES
PHYSICS
SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
TESTING
TRANSFORMERS
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Summary:An electronic trip unit for a circuit breaker (10) having two current sensors (16 and 17) per phase, wherein the first magnetic core current transformer (16) is designed to monitor current in the normal and overcurrent range, and the second low-permeability core sensor (17) is designed to produce an override trip signal at or below the short time withstand current rating of the circuit breaker (10). In a second embodiment the electronic trip unit includes only the low-permeability core sensor (17) that has negligible output in the normal current range.
Bibliography:Application Number: EP19990100329