BS 7639:1993

Committees responsible
National foreword
Foreword
1 Scope
2 Object
3 Definitions
4 Symbols, subscripts and superscripts
4.1 Symbols
4.2 Subscripts
4.3 Superscripts
5 Calculation assumptions
6 Equivalent voltage source at the short-circuit
      location
Section one - Systems with short-circuit currents having
              no a.c. component decay (far-from-
              generator short circuits)
7 General
8 Short-circuit parameters
8.1 Balanced short circuit
8.2 Unbalanced short circuit
8.3 Short-circuit impedances
8.4 Conversion of impedances, currents and voltages
9 Calculation of short-circuit currents
9.1 Calculation method for balanced short circuits
9.2 Calculation method for line-to-line and line-to-
      earth short circuits
9.3 The minimum short-circuit currents
Section two - Systems with the short-circuit currents
              having decaying a.c. components (near-to-
              generator short circuits)
10 General
11 Short-circuit parameters
11.1 General
11.2 Balanced short circuit
11.3 Unbalanced short circuit
11.4 Equivalent voltage source at the short-circuit
      location
11.5 Short-circuit impedances
12 Calculation of short-circuit currents
12.1 General
12.2 Calculation method for balanced short circuits
12.3 Calculation method for line-to-line and line-to-
      earth short circuits
12.4 The minimum short-circuit currents
13 Influence of motors
13.1 Synchronous motors and synchronous compensators
13.2 Asynchronous motors
13.3 Static converter fed drives
14 Consideration of non-rotating loads and capacitors
14.1 Parallel capacitors
14.2 Series capacitors
Appendix
A Calculation of short-circuit currents, examples
National annexes
NA (informative) Original IEC text amended by CENELEC
      common modifications
NB (informative) Cross-references

Specifies a procedure for the calculation of systems operating at 50 Hz or 60 Hz with nominal voltage up to 380 kV.