Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – For fault location
Patent
1997-08-12
1998-10-27
Do, Diep N.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
For fault location
324 67, 324 712, 324551, 324326, G01R 3112, G01V 311
Patent
active
058282190
ABSTRACT:
A system for detecting faults in the insulation layer surrounding a concealed conducting pipe (10) includes a signal generator (12) for applying an alternating current with a frequency of around 4Hz to the pipe, a magnetometer (102) for detecting the alternating current from the pipe (10) and a CPU (115) for identifying changes in the gradient of the detected current along the length of the concealed conducting pipe (10) which are caused by the faults in the insulation layer. The magnetometer (102) is used in connection with a locator(100) which detects a second alternating current applied to the pipe (10) by the signal generator (12), this second alternating current having a frequency of around 128Hz. The system can also use both these signals to determine the direction of the signals emulating from the pipe (10).
REFERENCES:
patent: 4370610 (1983-01-01), Allen et al.
patent: 4390836 (1983-06-01), Bruce et al.
patent: 4438389 (1984-03-01), De Sa
patent: 4710708 (1987-12-01), Rorden et al.
patent: 5126654 (1992-06-01), Murphy et al.
Hanlon Jason Julian
Regini Andrzej Zbigniew
Do Diep N.
Radiodetection Ltd.
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