Table of Contents

FOREWORD<br>1 Scope<br>2 Normative references<br>3 Terms and definitions<br>4 Symbols, subscripts and superscripts<br>5 Characteristics of short-circuit currents: calculating<br>&nbsp;&nbsp;&nbsp;method<br>6 Short-circuit impedances of electrical equipment<br>7 Calculation of initial short-circuit current<br>8 Calculation of peak short-circuit current<br>9 Calculation of symmetrical breaking current<br>10 DC component of the short-circuit current<br>11 Calculation of steady-state short-circuit current<br>12 Short circuits at the low-voltage side of transformers,<br>&nbsp;&nbsp;&nbsp;if one line conductor is<br>interrupted at the high-voltage side<br>13 Terminal short circuit of asynchronous motors<br>14 Joule integral and thermal equivalent short-circuit<br>&nbsp;&nbsp;&nbsp;current<br>Annex A (normative) - Formulas for the calculation of the<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;factors m and n<br>Annex B (informative) - Nodal admittance and nodal<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;impedance matrices<br>Bibliography<br>Annex ZA (normative) - Normative references to<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;international publications with their<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;corresponding European publications

Abstract

Pertains to the calculation of short-circuit currents - in low-voltage three-phase AC systems, and - in high-voltage three-phase AC systems, operating at a nominal frequency of 50 Hz or 60 Hz.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	British Standards Institution
Pages
ISBN
Committee	PEL/73
Supersedes	96/216008 DC : DEC 96 12/30270636 DC : 0 BS 7639(1993) : 1993