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US 5,485,343 AGranted
Digital circuit interrupter with battery back-up facility
AssigneeGeneral Electric Company
InventorsEsteban Santos, Hanns P. Sailer, Paul H. Singer, Indrajit Purkayastha
Life of this patent
Estimating the term…
Abstract
A digital circuit interrupter utilizing current transformers for operating power is provided with a re-chargeable battery to power-up the trip unit as well as to power the display after an overcurrent trip occurrence to enable an operator to determine both the magnitude as well as the cause of the overcurrent condition.
Claims16
An electronic trip unit for a circuit interrupter comprising:
- transformer means arranged for connection with an electrical distribution system;
- a processor circuit connecting with said transformer means receiving sample current signals from said distribution system to determine the occurrence of an overcurrent condition, said processor circuit further receiving operational power from said transformer means;
- display means connecting with said processor circuit displaying magnitudes associated with an overcurrent condition;
- auxiliary power means connecting with said processor circuit providing operational power to said processor circuit when said electrical distribution system is disconnected from said processor circuit;
- and
- an interface circuit connecting with said processor circuit and said auxillary power means for controlably connecting said auxiliary power means with said processor circuit after said electrical distribution circuit has become disconnected from said electrical distribution system, said auxiliary power means including a battery or a first photocell.
3 more elements
An electronic trip unit for a circuit interrupter comprising:
- transformer means arranged for connection with an electrical distribution system;
- a processor circuit connecting with said transformer means receiving sample current signals from said distribution system to determine the occurrence of an overcurrent condition,
- said processor circuit further receiving operational power from said transformer means;
- display means connecting with said processor circuit displaying magnitudes associated with an overcurrent condition;
- auxiliary power means connecting with said processor circuit providing operational power to said processor circuit when said electrical distribution system is disconnected from said processor circuit;
- and
- an interface circuit connecting with said processor circuit and said auxiliary power means for controlably connecting said auxiliary power means with said processor circuit after said electrical distribution circuit has become disconnected from said electrical distribution system, said auxiliary power means includes a batter or a first photocell, and said first photocell is arranged within said display means.
4 more elements
An electronic trip unit for a circuit interrupter comprising:
- transformer means arranged for connection with an electrical distribution system;
- a processor circuit connecting with said transformer means receiving sample current signals from said distribution system to determine the occurrence of an overcurrent condition, said processor circuit further receiving operational power from said transformer means;
- display means connecting with said processor circuit displaying magnitudes associated with an overcurrent condition;
- and
- a photocell connecting with said processor circuit providing operational power to said processor circuit when said electrical distribution system is disconnected from said processor circuit.
2 more elements
An electronic trip unit for a circuit interrupter comprising:
- transformer means arranged for connection with an electrical distribution system;
- a processor circuit connecting with said transformer means receiving sample current signals from said distribution system to determine the occurrence of an overcurrent condition, said processor circuit further receiving operational power from said transformer means;
- display means connecting with said processor circuit displaying magnitudes associated with an overcurrent condition;
- and
- a photocell connecting with said display means providing operational power to said display means when said electrical distribution system is disconnected from said processor circuit.
2 more elements
Dependencies are inferred from the claim text.