IEC > Webstore > Search > Register > Check out > Payment > Order confirmation

Publication detail

This Redline version gives you an instant view of what's new in this edition 
Reference S+ IEC 60909-3 ed3.0 Redline version with track changes withdrawn corrigendum
> preview
Title 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
Publication date 2009-03-09
Format, price
(Swiss francs)
and language
325.- 254 pages
325.- 3561 Kb
Abstract IEC Standards+ 60909-3:2009 contains the International Standard and its Redline version. The Redline version provides you with a quick and easy way to compare all the changes between this standard and its previous edition. The Redline version is not an official IEC Standard, only the current version of the standard is to be considered the official document.

IEC 60909-3:2009 specifies procedures for calculation of the prospective short-circuit currents with an unbalanced short circuit in high-voltage three-phase a.c. systems operating at nominal frequency 50 Hz or 60 Hz, i. e.:
- currents during two separate simultaneous line-to-earth short circuits in isolated neutral or resonant earthed neutral systems;
- partial short-circuit currents flowing through earth in case of single line-to-earth short circuit in solidly earthed or low-impedance earthed neutral systems.
The currents calculated by these procedures are used when determining induced voltages or touch or step voltages and rise of earth potential at a station (power station or substation) and the towers of overhead lines. Procedures are given for the calculation of reduction factors of overhead lines with one or two earth wires. This edition constitutes a technical revision. The main changes with respect to the previous edition are:
- New procedures are introduced for the calculation of reduction factors of the sheaths or shields and in addition the current distribution through earth and the sheaths or shields of three-core cables or of three single-core cables with metallic non-magnetic sheaths or shields earthed at both ends;
- The information for the calculation of the reduction factor of overhead lines with earth wires are corrected and given in the new Clause 7;
- A new Clause 8 is introduced for the calculation of current distribution and reduction factor of three-core cables with metallic sheath or shield earthed at both ends;
- The new Annexes C and D provide examples for the calculation of reduction factors and current distribution in case of cables with metallic sheath and shield earthed at both ends.

This publication is to be read in conjunction with IEC 60909-0:2001.
Technical Committee 73 - Short-circuit currents  RSS
ICS Codes
17.220.01 Electricity. Magnetism. General aspects

29.240.20 Power transmission and distribution lines
Replaced by
Stability date 2012
Work in progress
ProjectStage codeForecast publication date
No project under development--


>> Advanced search

Quick access by ref. number


Your basket is empty
Your country is :
Your TVA is : You must login...


Accepted credit cards:
Prices in CHF (Swiss francs)
Request a pro forma to pay by bank transfer or cheque
Learn how to share your publications with your colleagues, using networking options
Prices in CHF (Swiss francs)
We accept the following credit cards:
To pay by bank transfer: request a pro forma
If you purchase regularly through the IEC Webstore you can open a corporate account

Just Published

>> Published in the last 30 days


  1. IEC 60601-1-2 Ed. 4.0
  2. IEC 60529 Ed. 2.2
  3. IEC 62366-1 Ed. 1.0
  4. IEC 61000-4-5 Ed. 3.0
  5. IEC 60601-1-11 Ed. 2.0
  6. IEC 61010-1 Ed. 3.0
  7. IEC 61000-4-4 Ed. 3.0
  8. IEC 60079-0 Ed. 6.0
  9. IEC 60825-1 Ed. 3.0
  10. IEC 61000-4-2 Ed. 2.0