Factor for apportioning the thermal capacitance of a cable jacket/oversheath

Symbol
$p_{\mathrm{j}}$
Unit
-
Formulae
$\frac{1}{2 \ln{\left (\frac{D_{\mathrm{e}}}{D_{\mathrm{a_{\mathrm{2}}}}} \right )}} - \frac{1}{-1 + \frac{D_{\mathrm{e}}^{2}}{D_{\mathrm{a_{\mathrm{2}}}}^{2}}}$long-term transients
$\frac{1}{\ln{\left (\frac{D_{\mathrm{e}}}{D_{\mathrm{a_{\mathrm{2}}}}} \right )}} - \frac{1}{-1 + \frac{D_{\mathrm{e}}}{D_{\mathrm{a_{\mathrm{2}}}}}}$short-term transients
Related
$D_{\mathrm{a_{\mathrm{2}}}}$
$D_{\mathrm{e}}$
Used in
$Q_{\mathrm{B_{\mathrm{d}}}}$
$Q_{\mathrm{B_{\mathrm{j}}}}$