Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1979-08-27
1983-01-25
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
G01R 3108
Patent
active
043706100
ABSTRACT:
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.
REFERENCES:
patent: 689254 (1901-12-01), Varley
patent: 1297929 (1919-03-01), Taylor
patent: 3076931 (1963-02-01), Jasper
patent: 3588802 (1971-06-01), Lerwill
patent: 3701940 (1972-10-01), Nilsson
patent: 3745452 (1973-07-01), Osburn et al.
patent: 3792350 (1974-02-01), Bossler et al.
patent: 3924179 (1975-12-01), Dozier
patent: 3991363 (1976-11-01), Lathrop
patent: 4039938 (1977-08-01), Link
patent: 4074188 (1978-02-01), Boatman et al.
Clegg et al., Modern Cable-Fault-Location Methods Proc. IEEE, vol. 122, No. 4, Apr. 1975, pp. 397-402.
Allen John K.
Allen Kenneth R.
McNally Gordon G.
BICC Public Limited Company
Strecker Gerard R.
LandOfFree
Locating sheath faults in underground power supply cables does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Locating sheath faults in underground power supply cables, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Locating sheath faults in underground power supply cables will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1626020