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1. WO1996006362 - CABLE FAULT LOCATION

Publication Number WO/1996/006362
Publication Date 29.02.1996
International Application No. PCT/GB1995/001911
International Filing Date 14.08.1995
Chapter 2 Demand Filed 01.02.1996
IPC
G01R 31/08 2006.01
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
31Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
08Locating faults in cables, transmission lines, or networks
CPC
G01R 31/083
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
31Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
08Locating faults in cables, transmission lines, or networks
081according to type of conductors
083in cables, e.g. underground
G01R 31/088
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
31Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
08Locating faults in cables, transmission lines, or networks
088Aspects of digital computing
Applicants
  • RADIODETECTION LIMITED [GB/GB]; Western Drive Bristol BS14 0AZ, GB (AllExceptUS)
  • LEWIS, Andrew, Biggerstaff [GB/GB]; GB (UsOnly)
Inventors
  • LEWIS, Andrew, Biggerstaff; GB
Agents
  • MEWBURN ELLIS; York House 23 Kingsway London WC2B 6HP, GB
Priority Data
9416859.819.08.1994GB
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) CABLE FAULT LOCATION
(FR) LOCALISATION D'UNE DEFECTUOSITE DANS UN CABLE ELECTRIQUE
Abstract
(EN)
In order to locate a fault in a cable (10) carrying a signal from a transformer (110), the signal is maintained by an investigation device (13) connected to a split-core transformer (12). The investigation device (13) continuously samples the current in successive sampling periods and when a high current, due to a fault, is detected, the immediately preceding sampling period is investigated. By using auto correction technique, the distance between the split core transformer (12) and the fault point (P) can be determined. The investigation device may employ a buffer memory which stores data corresponding to sampling the signal for the immediately preceding period, at the same time that it is receiving data corresponding to the current sampling period. For branched cables, it may be necessary to monitor the voltage on each branch, to determine which branch contains the fault.
(FR)
Selon l'invention, un système d'investigation (13) connecté à un transformateur à pipe (12) permet de localiser une défectuosité dans un câble (10) acheminant un signal émis par un transformateur (110) en maintenant ce signal. Le système d'investigation (13) contrôle en permanence l'intensité du courant par périodes successives d'échantillonnage et examine les données relatives à la période d'échantillonnage immédiatement antérieure dès qu'un courant à haute intensité est détecté en raison d'une défectuosité. Il est possible de déterminer la distance séparant le transformateur à pipe du point (P) défaillant par la technique de l'autocorrection. Le système d'investigation peut faire appel à une mémoire tampon qui stocke les données relatives à la période d'échantillonnage immédiatement antérieure en même temps qu'elle reçoit les données relatives à la période d'échantillonnage en cours. S'agissant de câbles dérivés, il peut s'avérer nécessaire de contrôler la tension de chaque dérivation, afin d'être en mesure d'identifier ladérivation défaillante.
Also published as
EP1995927890
Latest bibliographic data on file with the International Bureau