IEC TR 609094:2000
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
Shortcircuit currents in threephase a.c. systems  Part 4: Examples for the calculation of shortcircuit currents
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FOREWORD
1 General
1.1 Scope and object
1.2 Reference documents
1.3 Definitions, symbols and indices, and equations
2 Positivesequence, negativesequence and zerosequence
impedance's of electrical equipment
2.1 Overhead lines, cables and shortcircuit
limiting reactors
2.2 Transformers
2.3 Generators and powerstation units
3 Calculation of shortcircuit currents in a lowvoltage
system Un = 400 V
3.1 Problem
3.2 Determination of the positivesequence
impedance's
3.2.1 Network feeder
3.2.2 Transformers
3.2.3 Lines (cables and overhead lines)
3.3 Determination of the zerosequence impedance's
3.3.1 Transformers
3.3.2 Lines (cables and overhead lines)
3.4 Calculation of Ik and ip for threephase short
circuits
3.4.1 Shortcircuit location F1
3.4.2 Shortcircuit location F2
3.4.3 Shortcircuit location F3
3.5 Calculation of Ikl and ip1 for linetoearth
short circuits
3.5.1 Shortcircuit location F1
3.5.2 Shortcircuit location F2
3.5.3 Shortcircuit location F3
3.6 Collection of results
4 Calculation of threephase shortcircuit currents in
a mediumvoltage system  influence of motors
4.1 Problem
4.2 Complex calculation with absolute quantities
4.3 Calculation with shortcircuit reactances of
electrical equipment
4.4 Calculation with perunit quantities
4.5 Calculation with the superposition method
5 Calculation of threephase shortcircuit currents for
a power station unit and the auxiliary network
5.1 Problem
5.2 Shortcircuit impedance's of electrical
equipment
5.2.1 Network feeder
5.2.2 Powerstation unit
5.2.3 Auxiliary transformers
5.2.4 Lowvoltage transformers 2,5 MVA and
1,6 MVA
5.2.5 Asynchronous motors
5.3 Calculation of shortcircuit currents
5.3.1 Shortcircuit location F1
5.3.2 Shortcircuit location F2
5.3.3 Shortcircuit location F3
5.3.4 Shortcircuit location F4
5.3.5 Shortcircuit location F5
6 Test network for the calculation of shortcircuit
currents with digital programs in accordance with
IEC 609090
6.1 General
6.2 Highvoltage test network 380 kV/110 kV/30 kV
6.2.1 Network topology and data
6.2.2 Shortcircuit impedance's of electrical
equipment
6.3 Results
6.3.1 Threephase shortcircuit currents
6.3.2 Linetoearth shortcircuit currents
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