SN EN 60071-1 : 2006 + A1 2010

1 Scope
2 Normative references
3 Definitions
3.1 Insulation co-ordination
3.2 External insulation
3.3 Internal insulation
3.4 Self-restoring insulation
3.5 Non-self-restoring insulation
3.6 Insulation configuration terminal
3.7 Insulation configuration
3.8 Normal voltage of a system
3.9 Highest voltage of a system
3.10 Highest voltage for equipment (Um)
3.11 Isolated neutral system
3.12 Solidly earthed neutral system
3.13 Impedance earthed (neutral) system
3.14 Resonant earthed (neutral) system
3.15 Earth fault factor
3.16 Overvoltage
3.17 Classification of voltages and overvoltages
3.18 Standard voltage shapes
3.19 Representative overvoltages (Urp)
3.20 Overvoltage limiting device
3.21 Lightning (or switching) impulse protective level
3.22 Performance criterion
3.23 Withstand voltage
3.24 Co-ordination withstand voltage (Ucw)
3.25 Co-ordination factor (Kc)
3.26 Standard reference atmospheric conditions
3.27 Required withstand voltage (Urw)
3.28 Atmospheric correction factor (Ka)
3.29 Safety factor (Ks)
3.30 Standard withstand voltage (Uw)
3.31 Test conversion factor (Kt)
3.32 Rated insulation level
3.33 Standard insulation level
3.34 Standard withstand voltage tests
4 Procedure for insulation co-ordination
4.1 General outline of the procedure
4.2 Determination of the representative overvoltages (Urp)
4.3 Determination of the co-ordination withstand
     voltages (Ucw)
4.4 Determination of the required withstand
     voltages (Urw)
4.5 Selection of the rated insulation level
4.6 List of standard short-duration power frequency
     withstand voltages
4.7 List of standard impulse withstand voltages
4.8 Ranges for highest voltage for equipment
4.9 Selection of the standard insulation levels
5 Requirements for standard withstand voltage tests
5.1 General requirements
5.2 Standard short-duration power-frequency
     withstand voltage tests
5.3 Standard impulse withstand voltage tests
5.4 Alternative test situation
5.5 Phase-to-phase and longitudinal insulation
     standard withstand voltage tests for
     equipment in range I
5.6 Phase-to-phase and longitudinal insulation
     standard withstand voltage tests for
     equipment in range II
Figure
Tables
Annex A
Annex ZA (normative) Normative references to
international publications with their
corresponding European publications


     
     

Specifies the procedure for the selection of the standard withstand voltages for the phase-to-earth, phase-to-phase and longitudinal insulation of the equipment and the installations of these systems. Applies to three-phase a.c. systems that have a highest voltage for equipment above 1 kV. Recommends that the selected withstand voltages should be associated with the highest voltage for equipment.