Cableizer ®

Phase-to-phase fault current

Definition according to Schneider Electric Cahier technique 158 (2000), chap. 2.1)

This is a fault between two phases, supplied with a phase-to-phase voltage U. In this case, the short-circuit current $I_{sc_2}$ is less than that of a three-phase fault:
$I_{sc_3} = \frac{U/\sqrt{3}}{Z_1}$, $I_{sc_2} = \frac{U}{2 \cdot Z_1}$ $\rightarrow$ $I_{sc_2} = \frac{\sqrt{3}}{2} I_{sc_3}$

For a fault occuring near rotating machines, the impedance of the machines is such that $I_{sc_2}$ is close to $I_{sc_3}$

Symbol
$I_{k2}$
Unit
A
Formulas
$\frac{\sqrt{3}}{2} I_{k3}$
Related
$I_{k3}$
Three-phase symmetrical fault current [A]
Used in
$I_{ka}$
Complex conductor current a [A]
$I_{kb}$
Complex conductor current a [A]
$I_{kc}$
Complex conductor current c [A]