ETS-Lindgren HI-3627 ELF Magnetic Field Meter - Manual (Page 21)

HI-3627 Manual Page --13
Figure 5-1
5.0 Example Applications of the HI-3627
Mapping Power Lines
Magnetic fields near power lines can be easily measured with
the HI-3627. An approach commonly used to characterize
power line fields is to measure the flux density along a straight
line which passes perpendicular to the power line. Generally,
readings are first taken along the length of a span of the power
line to identify the point at which the greatest flux density
exists. Then at this point take the readings perpendicular to the
power line. Take readings every five to ten feet. A magnetic
field flux density profile can then be developed. This method is
outlined by the Institute of Electrical and Electronics Engineers
(IEEE) in the American National Standards Institute (ANSI)
standard 644-1987 (1).
Figure 5-1 is an example of a theoretical profile obtained for a
230 kilovolt (kV), single circuit line with 1000 amperes flowing
in the conductors. For the particular case presented, the
conductors are situated 50 feet above ground and are spaced