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IEC/TR 60909-4 Ed. 2.0 en:2021

Short-circuit currents in three-phase AC systems - Part 4: Examples for the calculation of short-circuit currents
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IEC/TR 60909-4 Ed. 2.0 en:2021

Short-circuit currents in three-phase AC systems - Part 4: Examples for the calculation of short-circuit currents

PUBLISH DATE 2021
IEC/TR 60909-4 Ed. 2.0 en:2021

Short-circuit currents in three-phase AC systems - Part 4: Examples for the calculation of short-circuit currents

IEC TR 60909-4:2021, which is a Technical Report, is intended to give help for the application of IEC 60909-0 for the calculation of short-circuit currents in 50 Hz or 60 Hz three-phase AC systems.

This document does not include additional requirements but gives support for the modelling of electrical equipment in the positive-sequence, the negative-sequence and the zero-sequence system (Clause 4), the practical execution of calculations in a low-voltage system (Clause 5), a medium-voltage system with asynchronous motors (Clause 6) and a power station unit with its auxiliary network feeding a large number of medium-voltage asynchronous motors and low-voltage motor groups (Clause 7).

The three examples given in Clauses 5, 6 and 7 are similar to those given in IEC TR 60909-4:2000 but they are revised in accordance with IEC 60909-0, which replaces it. The example given in Clause 8 is new and mirrors the introduction of the new 6.8 of IEC 60909-0:2016.

Clause 9 gives the circuit diagram and the data of a test network and the results for a calculation carried out in accordance with IEC 60909-0, to offer the possibility for a comparison between the results found with a digital program for the calculation of short-circuit currents and the given results for and in a high-voltage network with power station units, generators, asynchronous motors and lines in four different voltage levels: 380 kV, 110 kV, 30 kV and 10 kV.

This second edition cancels and replaces the first edition published in 2000. This edition constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous edition:

  • a) adaption to IEC 60909-0:2016;
  • b) addition of an example for the calculation of short-circuit currents of wind power station units;
  • c) correction of errors.
SDO IEC: International Electrotechnical Commission
Document Number IEC/TR 60909
Publication Date June 1, 2021
Language en - English
Page Count
Revision Level 2.0
Supercedes
Committee 73
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