IEC 60909-3:2009 RLV
Current
The latest, up-to-date edition.
Short-circuit currents in three-phase AC systems - Part 3: Currents during two separate simultaneous line-to-earth short circuits and partial short-circuit currents flowing through earth
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English - French
03-09-2009
FOREWORD
1 Scope and object
2 Normative references
3 Terms and definitions
4 Symbols
5 Calculation of currents during two separate
simultaneous line-to-earth short circuits
6 Calculation of partial short-circuit currents flowing
through earth in case of an unbalanced short circuit
7 Reduction factor for overhead lines with earth wires
8 Calculation of current distribution and reduction
factor in case of cables with metallic sheath or
shield earthed at both ends
Annex A (informative) - Example for the calculation of two
separate simultaneous lineto-earth short-circuit
currents
Annex B (informative) - Examples for the calculation of partial
short-circuit currents through earth
Annex C (informative) - Example for the calculation of the
reduction factor r[1] and the current distribution
through earth in case of a three-core cable
Annex D (informative) - Example for the calculation of the
reduction factor r[3] and the current distribution
through earth in case of three single-core cables
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