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BSI PD IEC/TR 60725:2012

BSI PD IEC/TR 60725:2012

$167.15

Consideration of reference impedances and public supply network impedances for use in determining disturbance characteristics of electrical equipment having a rated current ≤ 75 A per phase

Published By Publication Date Number of Pages
BSI 2012 33
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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.

In addition, information is given on the impedances of public supply networks associated with service current capacities ≥100 A per phase.

PDF Catalog

PDF Pages PDF Title
4 English
CONTENTS
6 FOREWORD
8 1 Scope
2 Normative references
3 Systems of low-voltage supply
3.1 Three-phase supply systems
9 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 1 – Representation of a single-phase three-wire supply system
10 Tables
Table 1 – Residential consumers’ complex supply impedances at 50 Hz
11 Table 2 – Single-phase device capacities <100 A per phase
Table 3 – Three-phase service capacities <100 A per phase
12 4.2 Large residential, commercial and light industrial premises
4.2.1 General
Table 4 – Single or two-phase service capacities ≥100 A per phase
Table 5 – Three-phase service capacities ≥100 A per phase
13 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 6 – Modulus values of supply impedance, in ohms at 50 Hz,relevant to the connection of three-phase equipment and having a 95 % probability of not being exceeded
14 5 Reference impedances
5.1 General
5.2 Reference impedances for equipment with current ratings ≤16 A
5.2.1 Overview
Table 7 – Modulus values of supply impedance, in ohms at 50 Hz, relevant to the connection of single-phase equipment and having a 95 % probability of not being exceeded
15 5.2.2 50 Hz and 60 Hz low-voltage supply systems
Table 8 – Reference impedances for testing purposes
16 Table 9 – Reference impedances for 100 V/200 V and 120 V/240 V supply systems <100 A
Table 10 – Reference impedances for 200 V to 240 V supply systems <100 A
17 5.3 Reference impedance for 50 Hz and 60 Hz equipment with current ratings >16 A and ≤75 A per phase
6 Impedance at frequencies above the supply frequency
Table 11 – Reference impedances for 200 V to 240 V supply systems, ≥100 A per phase
Table 12 – Reference impedances for testing purposes,for 200 V to 240 V supply systems, ≥100 A
18 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
20 Figure A.1 – Model used for determining the impedance of a network line conductor from a transformer to a three-phase service cut-out
21 Figure A.2 – Three-phase impedance diagram of a typical 500 kVA transformer and mains cable
23 Table A.1 – Modulus values of the maximum supply impedance, in ohms, of the line-conductors of 230 V/400 V, 50 Hz, public electricity supply networks, relevant to three-phase services having service capacities of 200 A per phase
24 Table A.2 – Modulus values of the maximum supply impedance, in ohms, of the line and neutral conductors of 230 V/400 V, 50 Hz, public electricity supply networks, relevant to three-phase services having service capacities of 200 A per phase
26 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 B.1 – Model used for determining the impedance of a network line conductor from a transformer to a three-phase service cut-out
28 Annex C (informative) Measurement of supply impedance and survey method
29 Figure C.1 – Measurement of impedance at a customer’s premises
30 Table C.1 – Impedance values for copper conductor installation wiring
31 Bibliography

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BSI PD IEC/TR 60725:2012
$167.15