Fault location

Details Fault location Fault location

1991-03-19

1993-02-02

Harvey, Jack B.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

356 731, 324532, G01R 3111

Patent

active

051840812

ABSTRACT:
A method of locating an intermittent electrical fault in an optical undersea transmission system, comprises measuring the time difference between two signals emanating from the fault along two different routes of the system. In one embodiment one of the signals is a voltage transient and the other signal is an optical error signal created in a repeater adjacent the fault as a result of surge protection in the repeater responding to the electrical fault, and in another embodiment both signals are optical signals, once again emanating from adjacent repeaters and caused by the effect of the electrical fault on the adjacent repeaters. It is envisaged that such a transmission system could be permanently provided with apparatus to detect such a fault in which synchronized counters are permanently running and frequently re-set and which stop in response to error signals being received from a fault when it occurs.

REFERENCES:
patent: 3612782 (1971-10-01), Gilbert
patent: 4006320 (1977-02-01), Marki
patent: 4300239 (1981-11-01), Wakabayashi et al.
patent: 4499417 (1985-02-01), Wright et al.
patent: 4606632 (1986-08-01), Hillerich
Rosher, et al., "An automatic optical fibre break location scheme for duplex and diplex transmission systems", Br. Telecom Technology, vol. 6, No. 1, p. 54, Jan. 1988.
IBM Technical Disclosure Bulletin vol. 21, No. 9, Feb. 1979 Testing Telecommunication Cables for Damage Szeredi.

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