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      • CSA C71-2:98 (R2021)

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      CSA C71-2:98 (R2021)

      Insulation Co-Ordination - Part 2: Application Guide (Adopted CEI/IEC 71-2:1996, third edition, 1996-12, with Canadian deviations) | Coordination de l'isolement - Partie 2: Guide d'application (norme CEI/IEC 71-2:1006 adoptée, troisième édition, 1996-12, avec exigences propres au Canada)
      SKU: 2411287 Published by CSA Group Publication Year 1998 Reaffirmed in 2021 271 pages

      Product Details

      • Preface/Scope

      CSA Preface


      This is the first edition of CSA Standard CAN/CSA-C71-2, Insulation co-ordination — Part 2: Application guide, which is an adoption, with Canadian deviations, of the identically titled CEI/IEC (International Electrotechnical Commission Standard 71-2: 1996 (third edition, 1996-12).


      Scope


      This part of IEC 71 constitutes an application guide and deals with the selection of insulation levels of equipment or installations for three-phase electrical systems. Its aim is to give guidance for the determination of the rated withstand voltages for ranges I and II of IEC 71-1 and to justify the association of these rated values with the standardized highest voltages for equipment.


      This association is for insulation co-ordination purposes only. The requirements for human safety are not covered by this application guide.


      It covers three-phase systems with nominal voltages above 1 kV. The values derived or proposed herein are generally applicable only to such systems. However, the concepts presented are also valid for two-phase or single-phase systems.


      It covers phase-to-earth, phase-to-phase and longitudinal insulation.


      This application guide is not intended to deal with routine tests. These are to be specified by the relevant product committees.


      The content of this guide strictly follows the flow chart of the insulation co-ordination process presented in figure 1 of IEC 71-1. Clauses 2 to 5 correspond to the squares in this flow chart and give detailed information on the concepts governing the insulation co-ordination process which leads to the establishment of the required withstand levels.


      The guide emphasizes the necessity of considering, at the very beginning, all origins, all classes and all types of voltage stresses in service irrespective of the range of highest voltage for equipment. Only at the end of the process, when the selection of the standard withstand voltages takes place, does the principle of covering a particular service voltage stress by a standard withstand voltage apply. Also, at this final step, the guide refers to the correlation made in IEC 71-1 betweeen the standard insulation levels and the highest voltage for equipment.


      The annexes contain examples and detailed information which explain or support the concepts described in the main text, and the basic analytical techniques used.


      --------------------------------------------------------------------------------------------------------------------------------


      Préface CSA


      Ce document constitue la première édition de la norme CAN/CSA-C71-2, Coordination de l'isolement — Partie 2: Guide d'application. II s'agit de l'adoption, avec exigences propres au Canada, de Ia norme internationale de Ia Commission Electrotechnique Internationale CEI/IEC 71 -2: 1 996 (troisième édition, 1996-12), qui porte le même titre.


      Domaine d'application


      La présente partie de la CEI 71 constitue un guide d'application et concerne le choix des niveaux d'isolement des matériels ou des installations pour les réseaux triphasés. Son but est de donner des recommandations pour la détermination des tensions de tenue assignées pour les gammes I et II de la CEI 71-1 et de justifier l'association de ces valeurs assignées avec les valeurs normalisées des tensions les plus élevées pour le matériel.


      Cette association ne couvre que les besoins de la coordination de l'isolement. Les exigences relatives à la sécurité des personnes ne sont pas traitées dans ce guide d'application.


      Il traite des réseaux triphasés de tension nominale supérieure à 1 kV. Les valeurs qui en sont déduites ou qui y sont proposées ne sont généralement applicables qu'à ces seuls réseaux. Cependant, les principes présentés sont également valables pour les réseaux biphasés ou monophasés.


      Il traite de l'isolement phase-terre, entre phases et longitudinal.


      Ce guide d'application n'est pas destiné à détailler les essais de routine qui seront spécifiés par les comités de produits concernés.


      Le contenu de ce guide suit strictement l'organigramme de la procédure de la coordination de l'isolement présenté à la figure 1 de la CEI 71-1. Les articles 2 à 5 correspondent à chacun des rectangles de l'organigramme et donnent des informations détaillées sur les principes de la procédure de coordination de l'isolement qui conduit à déterminer les niveaux de tenue spécifiés.


      Ce guide insiste sur la nécessité de prendre en compte, dès le départ, toutes les origines, toutes les classes et tous les types de contraintes de tension en service quelle que soit la gamme de la tension la plus élevée pour le matériel. Ce n'est qu'à la fin de la procédure, au moment de sélectionner les tensions de tenue normalisées, que l'on applique le principe de couvrir une contrainte de tension particulière en service par une tension de tenue normalisée. Aussi le guide fait-il référence, à cette étape finale, aux corrélations établies dans la CEI 71-1 entre les niveaux d'isolement normalisés et la tension la plus élevée pour le matériel.


      Les annexes contiennent des exemples et des informations détaillées qui expliquent ou corroborent les principes décrits dans le texte principal, et les techniques analytiques de base qui sont utilisées.

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