Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1998-05-29
1999-11-16
Hofsass, Jeffery A.
Communications: electrical
Condition responsive indicating system
Specific condition
340639, 361104, 361115, G08B 2100
Patent
active
059865580
ABSTRACT:
Provided is a modular precharge circuit capable of rapidly recharging an equipment circuit path prior to insertion of a modular fuse or modular circuit breaker. The precharge circuit includes a switch to begin the operation of precharging, and a charge indicator to indicate appropriate charging has occurred. Charging occurs through use of a resistive network which receives an inrush current due to capacitance in the equipment circuit path. Once an equipment circuit path has been precharged to a desired level, a charge indicator signifies such charging is complete and the precharged unit is removed whereafter an appropriate fuse module and/or circuit breaker module is inserted. The precharge circuit further includes a fusing element and an alarm indicator wherein when the circuit enters a fault state such that the fuse is open, the alarm indicator signifies such a situation. Additionally, when the charging indicator verifies the charging element is not precharging the circuit to a desired level, an indication of a short exists.
REFERENCES:
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patent: 3558983 (1971-01-01), Steen
patent: 3725742 (1973-04-01), Pollard
patent: 4573113 (1986-02-01), Bauman
patent: 4642733 (1987-02-01), Schacht
patent: 5012161 (1991-04-01), Borowiec et al.
patent: 5233330 (1993-08-01), Hase
patent: 5726852 (1998-03-01), Trifuetti et al.
Crawford William A.
Michlovic David J.
Hofsass Jeffery A.
Marconi Communications Inc.
Trieu Van T.
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