Holaday Industries HI-3624 User Manual - page 17
HI-3624 / HI-3624A Manual
Page 9
Figure 3
Example Applications of the HI-3624/HI-3624A
Power Lines
Magnetic fields near power lines can be easily measured with
the HI-3624. 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 and orient the
sensor for maximum reading. 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 3 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
32 feet apart. The actual profile shape is dependent on the
exact geometry of the power line, its height above ground and
the current flowing in the line. The flux density peaks near a
point beneath the conductors of the line.