| Reference |
IEC 60071-1 ed8.0 withdrawn corrigendum |
> preview
|
| Title |
Insulation co-ordination - Part 1: Definitions, principles and rules
|
| Publication date |
2006-01-23 |
Format, price
(Swiss francs)
and language |
 | 190.- |
| 35 pages |  | 190.- |
| 376 Kb |
|
| |
| Abstract |
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 procedures 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.
The main changes from the previous edition are as follows:
- in the definitions (3.26, 3.28 and 3.29) and in the environmental
conditions (5.9) taken into account clarification of the atmospheric
and altitude corrections involved in the insulation co-ordination
process;
- in the list of standard rated short-duration power frequency
withstand voltages reported in 5.6 addition of 115 kV;
- in the list of standard rated impulse withstand voltages reported
in 5.7, addition of 200 kV and 380 kV;
- in the standard insulation levels for range I (1kV < Um 245 kV)
(Table 2) addition of the highest voltage for equipment Um = 100 kV;
- in the standard insulation levels for range II (Um 245 kV)
(Table 3) replacement of 525 kV by 550 kV and of 765 kV by 800 kV;
- in order to remove that part in the next revision of IEC 60071-2,
addition of Annex A dealing with clearances in air to assure a
specified impulse withstand voltage in installation;
- in Annex B, limitation at two Um values for the values of rated
insulation levels for 1kV < Um 245 kV for highest voltages for
equipment Um not standardized by IEC based on current practice in
some countries
This English-language version is derived from the original bilingual
publication by leaving out all French-language pages. Missing page
numbers correspond to the French-language pages.
|
| Technical Committee |
28 - Insulation co-ordination
|
| ICS Codes |
|
| |
| Replaced by |
|
| Stability date |
2014 |
| |
| Work in progress |
| Project | Stage code | Forecast publication date |
|---|
| No project under development | - | - |
|
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