Browse Prior Art Database

Remote Detection of Conductor Failure

IP.com Disclosure Number: IPCOM000080438D
Original Publication Date: 1973-Dec-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 60K

Publishing Venue

IBM

Related People

Hyland, RN: AUTHOR [+2]

Abstract

A break or other failure, such as arcing, of conductors in a cable is remotely monitored and automatically detected.

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Remote Detection of Conductor Failure

A break or other failure, such as arcing, of conductors in a cable is remotely monitored and automatically detected.

Depending upon cable construction, a number of different sensing and indicator circuits may be used. In Fig. 1a, a specially constructed cable includes a weakened, or otherwise prestressed, conductor which will fail in response to mechanical trauma before the signal conductor enveloped in the same sheath fails. Standard single or multiple conductor cables may be sensed similarly or, more conveniently, by inductive windings or capacitive plates as shown in Figs. 1b-d. The inductive windings may be formed from a single flat wire, if desired. Multiple conductor cable also permits sensor grouping to facilitate identification of particular failed conductors, as shown in Fig. 1c. All the inductive and capacitive sensors are paralleled by approximately opposite reactances to provide impedance matches, minimum loading, maximum output amplitudes, etc. A series resonant circuit can instead be provided, if desired.

The cable of Fig. la may be monitored by a simple continuity circuit, which indicates a fault when the prestressed conductor breaks. Alternatively, an ohmmeter would indicate changes short of a complete break. The circuit of Fig. 2 may monitor any of the reactive sensors. A broadband signal amplifier and high-pass filter supply the normal signal conditions to a square-law (or other) detector to produce a slowly...