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Geometric mean radius of steel pipe

Symbol
$GMR_{sp}$
Unit
m
Formulae
$e^{-\left(\frac{1}{4}\right)} \sqrt{\frac{A_{sp}}{\pi}} \frac{1}{1000}$
Related
$A_{sp}$
Cross-sectional area of steel pipe [mm$^2$]
$\pi$
Archimedes' constant $\pi$
Used in
$X_1$
Positive sequence reactance [$\Omega$/m]
$X_{cp}$
Zero-sequence reactance steel pipe [$\Omega$/m]
$X_d$
Reactance steel pipe [$\Omega$/m]