Method for long term monitoring of magnetic fields

G - Physics – 01 – R

Patent

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Details

G01R 33/02 (2006.01) G01R 1/44 (2006.01) G01R 29/08 (2006.01) G01R 35/00 (2006.01)

Patent

CA 2203747

There is disclosed a methodology for measuring the magnetic field strengths of fundamental and harmonic frequencies associated with a.c. electrical current flows over a protracted period of time; and, particularly , in hostile environments. A preferable application calls for the determination of the field strengths associated with electrical currents flowing in a.c. power, distribution lines of utilities. The monitoring instrument is positioned in relation to the power lines to be monitored, typically at the base of a pole immediately adjacent the pole of the power line or on a power line supporting pole itself. In order to provide for long term, powering of the monitoring device, d.c. power is developed utilizing the a.c. power that is present. The conversion from a.c. to d.c. is effected at a distance sufficiently far from the monitoring instrument so as not to have any consequence on the readings that are being taken. Readings during the protracted period are typically stored and then accessable at pre-determined periods. A procedure for checking operability of the instrument is disclosed. The methodology further includes a technique for determining the lateral profile of magnetic field strengths for transverse distances from the location site of the monitoring instrument. The methodology disclosed has broad application including workplace monitoring.

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