Standard Number: IEC 60071-1 Ed. 8.1
Title: Insulation co-ordination - Part 1: Definitions, principles and rules
Language: English and French
Replacing Standard: IEC 60071-1 Ed. 8.0
Publisher: International Electrotechnical Commission (IEC)
Number of Pages:74
:IEC 60071-1-2006 Insulation co-ordination - Part 1: Definitions, principles and rules
+A1-2010 applies to three-phase a.c. systems having a highest voltage for equipment above 1 kV. It specifies the procedure for the selection of the rated withstand voltages for the phase-to-earth, phase-to-phase and longitudinal insulation of the equipment and the installations of these systems. It also gives the lists of the standard withstand voltages from which the rated withstand voltages should be selected. This standard recommends that the selected withstand voltages should be associated with the highest voltage for equipment. This association is for insulation co-ordination purposes only. The requirements for human safety are not covered by this standard. Although the principles of this standard also apply to transmission line insulation, the values of their withstand voltages may be different from the standard rated withstand voltages. The apparatus committees are responsible for specifying the rated withstand voltages and the test procedure
s suitable for the relevant equipment taking into consideration the recommendations of this standard. NOTE In IEC 60071-2, Application Guide, all rules for insulation co ordination given in this standard are justified in detail, in particular the association of the standard rated withstand voltages with the highest voltage for equipment. When more than one set of standard rated withstand voltages is associated with the same highest voltage for equipment, guidance is provided for the selection of the most suitable set. This publication has the status of a horizontal standard in accordance with IEC Guide 108. This consolidated version consists of the eigth edition (2006) and its amendment 1 (2010). Therefore, no need to order amendment in addition to this publication.
2 Normative references
3 Terms and definitions
4 Symbols and abbreviations
4.3 Letter symbols
5 Procedure for insulation co-ordination
5.1 General outline of the procedure
5.2 Determination of the representative voltages and overvoltages (Urp)
5.3 Determination of the co-ordination withstand voltages (Ucw)
5.4 Determination of the required withstand voltage (Urw)
5.5 Selection of the rated insulation level
5.6 List of standard rated short-duration power frequency withstand voltages
5.7 List of standard rated impulse withstand voltages
5.8 Ranges for highest voltage for equipment
5.9 Environmental conditions
5.10 Selection of the standard insulation level
5.11 Background of the standard insulation levels
6 Requirements for standard withstand voltage tests
6.1 General requirements
6.2 Standard short-duration power-frequency withstand voltage tests
6.3 Standard impulse withstand voltage tests
6.4 Alternative test situation
6.5 Phase-to-phase and longitudinal insulation standard withstand voltage tests for equip...
6.6 Phase-to-phase and longitudinal insulation standard withstand voltage tests for equip...
Annex A (normative)Clearances in air to assure a specified impulse withstandvoltage insta...
Annex?B (informative)Values of rated insulation levels for 1kV? 245?kV)
Table A.1 – Correlation between standard rated lightning impulse withstandvoltages and mi...
Table A.2 – Correlation between standard rated switching impulse withstandvoltages and mi...
Table A.3 – Correlation between standard rated switching impulse withstandvoltages and mi...
Table B.1 – Values of rated insulation levels for 1kV? 245?kV)
Tableau A.1 – Correspondance entre les tensions de tenue assignées normalisées au choc de...
Tableau A.2 – Correspondance entre les tensions de tenue assignées normalisées au choc de...
Tableau A.3 – Correspondance entre les tensions de tenue assignées normaliséesau choc de ...
Tableau B.1 – Valeurs de niveaux d'isolement assignés pour 1?kV?
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