Short circuit fault isolation means for electrical circuit arran

Details Short circuit fault isolation means for electrical circuit arran Short circuit fault isolation means for electrical circuit arran

1992-10-08

1994-06-21

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Feeder protection in distribution networks

361 63, 361 67, 340505, 34082554, H02H 308

Patent

active

RE0346438

ABSTRACT:
Circuitry is described for isolating a section of a loop circuit (L) from a bi-directional supply unit (20) in the event of a short circuit in the section. One or more circuit elements (21), such as fire detectors, are connected in respective portions of the loop circuit and between respective pairs of bi-directional isolators (1,2,3,4). Each isolator includes switching means (TR1,TR3) providing low and high impedance paths for respectively supplying current to said circuit elements and isolating said circuit elements from the supply unit (20). Each isolator also includes sensing means (TR2, D1, DS7) for sensing a short circuit in any one of the circuit elements (21) whereby the sensing means causes a change in state of the switching means from the low to the high impedance path thereby isolating the circuit elements in the respective section of the loop from the supply unit.

REFERENCES:
patent: Re28958 (1976-09-01), Zafiropulo et al.
patent: 2354138 (1944-07-01), Parsons
patent: 2525527 (1950-10-01), Dannenberg
patent: 2595032 (1952-04-01), Wensley
patent: 3652798 (1972-03-01), McNeilly et al.
patent: 4404548 (1983-09-01), Mueller et al.
International Conference On Communications, vol. 1, 8th-12th Jun. 1980, pp. 14.3.1-14.3.5, Seattle, USA, C. H. Draft: "A 1 MBIT/SEC data loop for security sites" *Abstract*.

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