This Technical Report records the information that was available and the factors that were taken into account in arriving at the reference impedances that were incorporated in IEC 60555 and which are now incorporated in some parts of IEC 61000-3.<\/p>\n
In addition, information is given on the impedances of public supply networks associated with service current capacities \u2265100 A per phase.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 4<\/td>\n | English CONTENTS <\/td>\n<\/tr>\n | ||||||
| 6<\/td>\n | FOREWORD <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | 1 Scope 2 Normative references 3 Systems of low-voltage supply 3.1 Three-phase supply systems <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | 3.2 Single-phase two-wire supply systems 3.3 Single-phase three-wire supply systems 4 Supply impedances 4.1 Typical residential premises Figures Figure\u00a01 \u2013 Representation of a single-phase three-wire supply system <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | Tables Table\u00a01 \u2013 Residential consumers’ complex supply impedances at 50\u00a0Hz <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | Table 2 \u2013 Single-phase device capacities <100 A per phase Table 3 \u2013 Three-phase service capacities <100 A per phase <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 4.2 Large residential, commercial and light industrial premises 4.2.1 General Table\u00a04 \u2013 Single or two-phase service capacities \u2265100\u00a0A per phase Table\u00a05 \u2013 Three-phase service capacities \u2265100\u00a0A per phase <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 4.2.2 Supply impedance relevant to the connection of three-phase equipment 4.2.3 Supply impedances relevant to the connection of single-phase equipment Table\u00a06 \u2013 Modulus values of supply impedance, in ohms at 50\u00a0Hz,relevant to the connection of three-phase equipment and having a 95\u00a0% probability of not being exceeded <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 5 Reference impedances 5.1 General 5.2 Reference impedances for equipment with current ratings \u226416\u00a0A 5.2.1 Overview Table\u00a07 \u2013 Modulus values of supply impedance, in ohms at 50\u00a0Hz, relevant to the connection of single-phase equipment and having a 95\u00a0% probability of not being exceeded <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 5.2.2 50\u00a0Hz and 60\u00a0Hz low-voltage supply systems Table\u00a08 \u2013 Reference impedances for testing purposes <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | Table 9 \u2013 Reference impedances for 100 V\/200 V and 120 V\/240 V supply systems <100 A Table 10 \u2013 Reference impedances for 200 V to 240 V supply systems <100 A <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | 5.3 Reference impedance for 50\u00a0Hz and 60\u00a0Hz equipment with current ratings >16\u00a0A and \u226475\u00a0A per phase 6 Impedance at frequencies above the supply frequency Table\u00a011 \u2013 Reference impedances for 200\u00a0V to 240\u00a0V supply systems, \u2265100\u00a0A per phase Table\u00a012 \u2013 Reference impedances for testing purposes,for 200\u00a0V to 240\u00a0V supply systems, \u2265100\u00a0A <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | Annex A (informative) Methods for determining the maximum modulus values of public electricity supply low-voltage network impedances relevant to threephase services of more than 100 A per phase at 50 Hz <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | Figure\u00a0A.1 \u2013 Model used for determining the impedance of a network line conductor from a transformer to a three-phase service cut-out <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | Figure\u00a0A.2\u00a0\u2013 Three-phase impedance diagram of a typical 500\u00a0kVA transformer and mains cable <\/td>\n<\/tr>\n | ||||||
| 23<\/td>\n | Table\u00a0A.1 \u2013 Modulus values of the maximum supply impedance, in ohms, of the line-conductors of 230\u00a0V\/400\u00a0V, 50\u00a0Hz, public electricity supply networks, relevant to three-phase services having service capacities of 200\u00a0A per phase <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | Table\u00a0A.2 \u2013 Modulus values of the maximum supply impedance, in ohms, of the line and neutral conductors of 230\u00a0V\/400\u00a0V, 50\u00a0Hz, public electricity supply networks, relevant to three-phase services having service capacities of 200\u00a0A per phase <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | Annex B (informative) Methods for determining the maximum modulus values of public electricity supply low-voltage network impedances relevant to three-phase services of more than 100 A per phase at 60 Hz Figure\u00a0B.1 \u2013 Model used for determining the impedance of a network line conductor from a transformer to a three-phase service cut-out <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | Annex C (informative) Measurement of supply impedance and survey method <\/td>\n<\/tr>\n | ||||||
| 29<\/td>\n | Figure\u00a0C.1 \u2013 Measurement of impedance at a customer\u2019s premises <\/td>\n<\/tr>\n | ||||||
| 30<\/td>\n | Table\u00a0C.1 \u2013 Impedance values for copper conductor installation wiring <\/td>\n<\/tr>\n | ||||||
| 31<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Consideration of reference impedances and public supply network impedances for use in determining disturbance characteristics of electrical equipment having a rated current \u2264 75 A per phase<\/b><\/p>\n |