CALCULATION OF THERMALLY PERMISSIBLE SHORT-CIRCUIT CURRENTS, TAKING INTO ACCOUNT NON-ADIABATIC HEATING EFFECTS
International Electrotechnical Committee
FOREWORD
PREFACE
INTRODUCTION
Clause
1 List of symbols
2 Permissible short-circuit current
3 Calculation of adiabatic short-circuit current
4 Calculation of short-circuit temperature
5 Calculation of non-adiabatic factor for conductors
and spaced wire screens
6 Calculation of non-adiabatic factor for sheaths,
screens and wires
FIGURE
APPENDIX A - Explanation of recommended methods for
taking into account non-adiabatic heating
effect when calculating permissible
short-circuit currents
The approach set out in this standard is to: a. calculate the adiabatic short-circuit current b. calculate a modifying factor that takes account of the non-adiabatic heating effect c. multiply a. and b. to obtain permissible short-circuit current.
| Document Type | Standard |
| Status | Current |
| Publisher | International Electrotechnical Committee |
| Committee | TC 20 |
