Method and circuit for locating a short circuit or cable break i

Details Method and circuit for locating a short circuit or cable break i Method and circuit for locating a short circuit or cable break i

1998-06-23

2000-08-22

Brown, Glenn W.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

324512, 324527, 324532, G01R 3111

Patent

active

061078077

ABSTRACT:
A method for pinpointing a short circuit or cable break in a two-wire bus system has the two-wire bus system being subjected at at least one point to a pulse of such a steepness that a reflection occurs at the location of the short circuit and/or cable break. The short circuit or cable break is pinpointed on the basis of the propagation time of the pulse. A circuit includes a pulse generator connected with a gate chain with a shift register, so that the passage of the signal through the gate chain is launched when a pulse is injected into the two-wire bus system. The distance of the short circuit or cable break from the point at which the pulse generator is connected to the two-wire bus system is determined from the number of gates traversed. In addition, a method for pinpointing a cable break, determines that a cable break in the connecting leads of a subscriber has occurred if this subscriber cannot be reached by communication over the bus.

REFERENCES:
patent: 3727128 (1973-04-01), McFerrin
patent: 4144487 (1979-03-01), Pharney
patent: 4151459 (1979-04-01), Fayolle et al.
patent: 4165482 (1979-08-01), Gale
patent: 4491782 (1985-01-01), Bellis et al.
patent: 5184081 (1993-02-01), Oswald et al.
DE-Z: ntz, vol. 49 (1994), vol. 4, pp. 242-246 entitled "Echomesstechnik macht LAN transparent" by Otto Knutz (no months available).

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