Electronic trip unit with user-adjustable sensitivity to current spikes

Electronic trip unit with user-adjustable sensitivity to current spikes

An electronic trip unit and a method of protection in an electronic trip unit comprises selecting a limit value, sensing an electrical signal to provide corresponding first and second sensed signals, each indicative of an electrical characteristic of the electrical signal, comparing said first and s...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: MESSERLI ALAN JOSEPH, CULLER MARK FREDERICK
Format: Patent
Sprache:eng
Schlagworte:
BASIC ELECTRIC ELEMENTS
CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
ELECTRIC SWITCHES
ELECTRICITY
EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
EMERGENCY PROTECTIVE DEVICES
GENERATION
RELAYS
SELECTORS
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Beschreibung
Zusammenfassung:An electronic trip unit and a method of protection in an electronic trip unit comprises selecting a limit value, sensing an electrical signal to provide corresponding first and second sensed signals, each indicative of an electrical characteristic of the electrical signal, comparing said first and second sensed signal to determine a rate of rise of said electrical characteristic, comparing said rate of rise to said limit value to detect a spike in said electrical characteristic, and withholding generation of a trip signal when said rate of rise is greater than said limit value.