EN 60909-0:2016

FOREWORD
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols, subscripts and superscripts
5 Characteristics of short-circuit currents: calculating
   method
6 Short-circuit impedances of electrical equipment
7 Calculation of initial short-circuit current
8 Calculation of peak short-circuit current
9 Calculation of symmetrical breaking current
10 DC component of the short-circuit current
11 Calculation of steady-state short-circuit current
12 Short circuits at the low-voltage side of transformers,
   if one line conductor is interrupted at the high-voltage
   side
13 Terminal short circuit of asynchronous motors
14 Joule integral and thermal equivalent short-circuit
   current
Annex A (normative) - Formulas for the calculation of the
        factors m and n
Annex B (informative) - Nodal admittance and nodal
        impedance matrices
Bibliography
Annex ZA (normative) - Normative references to
         international publications with their
         corresponding European publications

IEC 60909-0:2016 is applicable to the calculation of short-circuit currents in low-voltage three-phase AC systems, and in high-voltage three-phase AC systems, operating at a nominal frequency of 50 Hz or 60 Hz. It establishes a general, practicable and concise procedure leading to results which are generally of acceptable accuracy and deals with the calculation of short-circuit currents in the case of balanced or unbalanced short circuits. This second edition cancels and replaces the first edition published in 2001. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:- contribution of windpower station units to the short-circuit current;- contribution of power station units with ful size converters to the short-circuit current;- new document structure.