TC 28 - Insulation co-ordination
For power systems with nominal voltages above 1000 V a.c. and 1500 V d.c., to prepare international standards regarding: 1. A set of definitions used for insulation standardization and co-ordination. 2. The basic principles of insulation co-ordination. 3. The fields of application 4. The specification of a series of standard insulation levels (without regard to any particular type of equipment). 5. A full statement of the tests to be included in the specification of the equipment to meet the insulation levels to be used in relation to the possibilities of overvoltage protective devices. 6. Recommendations for the minimum clearance distance in air between live parts. 7. An application guide for the users of electrical equipment recommending the insulation levels to be used in relation to the possibilities of overvoltage protective devices.
Coordination de l'isolement
Pour les systèmes d'alimentation de tensions nominales supérieures à 1 000 V en courant alternatif et 1 500 V en courant continu, préparer des normes internationales concernant: 1. un ensemble de définitions utilisées pour la normalisation et la coordination de l'isolement 2. les principes de base de la coordination de l'isolement 3. les champs d'application 4. la spécification d'une série de niveaux d'isolement normalisés (ne se référant à aucun genre d'appareil en particulier) 5. l'énumération précise des essais à prévoir dans la spécification d'un matériel pour atteindre les niveaux d'isolement en relation avec les possibilités des dispositifs de protection contre les surtensions. 6. des recommandations sur la distance minimale dans l'air entre parties sous tension. 7. Un guide d'application destiné aux usagers du matériel électrique et donnant toutes recommandations concernant le choix des différents niveaux d'isolement en relation avec les possibilités des dispositifs de protection contre les surtensions.
General Information
IEC 60071-1:2019 is available as IEC 60071-1:2019 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 60071-1:2019 applies to three-phase AC 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 are selected. This document describes that the selected withstand voltages are 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 document. Although the principles of this document also apply to transmission line insulation, the values of their withstand voltages can 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 document.
NOTE In IEC 60071-2, all rules for insulation co‑ordination given in this document 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:
- all references are updated to current IEC standards, and the bibliography is deleted;
- some definitions are clarified in order to avoid overlapping and ensure clear understanding;
- letter symbols are changed and corrected in order to keep the consistency with relevant IEC standards;
- some titles are changed to clarify understanding (see Clauses A.2, A.3 and Annex B).
It has the status of a horizontal standard in accordance with IEC Guide 108.
- Standard70 pagesEnglish and French languagesale 15% off
Gives guidance on conducting insulation co-ordination studies which propose internationally recognized recommendations - for the numerical modelling of electrical systems, and - for the implementation of deterministic and probabilistic methods adapted to the use of numerical programmes. Its object is to give information in terms of methods, modelling and examples, allowing for the application of the approaches presented in IEC 60071-2, and for the selection of insulation levels of equipment or installations, as defined in IEC 60071-1.
- Technical report118 pagesEnglish languagesale 15% off