Line fault isolation system

Details Line fault isolation system Line fault isolation system

1990-06-18

1992-03-17

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

361 62, 361 63, 340506, H04B 300

Patent

active

050972596

ABSTRACT:
An alarm system in which a pair of transmission lines are disposed in a loop to define two channels of transmission from a controller to a group of interconnected detectors, the improvement comprising a spaced group of line fault isolators interleaved with respective sub-groups of detectors and connected across the lines for sensing a short circuit on the transmission lines so as to isolate the short circuit condition; the isolators including an arrangement for switching, in response to a signal transmitted from the controller, those isolators which are physically located adjacent to the short circuit without interfering with the operation of other detectors in the loop.

REFERENCES:
patent: 4369435 (1983-01-01), Adachi et al.
patent: 4507652 (1985-03-01), Vogt et al.
patent: 4568919 (1986-02-01), Muggli et al.
patent: 4752698 (1988-06-01), Furuyama et al.
patent: 4796012 (1989-01-01), Schechter et al.
patent: 4864519 (1989-09-01), Appleby et al.

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