04370610 is referenced by 23 patents and cites 16 patents.

In the location of an earth fault on a sheath of an underground cable, pulses of direct current are applied to the sheath at one location on the cable. A search is made at spaced locations along the cable route for the magnetic field due to a fault current to earth flowing in the sheath which is produced by the applied d.c. pulses using a portable magnetometer, with a visual indicator, and, at each of said spaced locations, the visual indications on the magnetometer are compared with the periods of application of the pulses to the sheath until they correspond. Comparison of the visual indications with the periods of application of the pulses is facilitated by transmitting signals indicative of the periods of current application and using, with the portable magnetometer, a portable receiver arranged to receive the transmitted signals so that the visual indications can be compared with the received signals.

Title
Locating sheath faults in underground power supply cables
Application Number
6/69855
Publication Number
4370610
Application Date
August 27, 1979
Publication Date
January 25, 1983
Inventor
Gordon G McNally
Fenay Bridge
GB
John K Allen
Huddersfield
GB
Kenneth R Allen
Longwood
GB
Agent
Buell Blenko Ziesenheim & Beck
Assignee
Bicc Public Company
GB
IPC
G01R 31/08
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