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The program models the wind pressure as falling away exponentially. It uses the
following equation for SRF:
SRF(l) = a +b exp (- l / L)
where l is the actual span length, and a, b and L are user-supplied constants.
This is illustrated below.
SRF
1.0
a
0
0
L
Span Length
For more information, refer Electricity Supply Association of Australia (ESAA)
document HB C(b)1 “Guidelines for Design and Maintenance of Overhead
Distribution and Transmission Lines” (1999 or later editions).
Wind Pressure Scaling Factor is used to scale the Wind Pressure where Pressure
(Pa) is selected as the Wind Force Unit.
It can be used to apply coefficients for:
terrain and any shielding
various levels of security/reliability
any drag coefficients
the direction of the wind
the air density.
Wind Speed Scaling Factor is used to scale the Wind Velocity where Velocity (m/s)
is selected as the Wind Force Unit. It can be used to apply various coefficients as
with Wind Pressure Scaling.
Rev 7
 PowerMation 2002-2009
Poles ‘n’ Wires User Manual
Sect 4 Page 3