IEC 60071-2 Ed. 5.0 b:2023

Current Revision
Insulation co-ordination - Part 2: Application guidelines

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Insulation co-ordination - Part 2: Application guidelines

PUBLISH DATE 2023
PAGES 384

Insulation co-ordination - Part 2: Application guidelines

IEC 60071-2:2023 is available as IEC 60071-2:2023 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.

IEC 60071-2:2023 constitutes application guidelines and deals with the selection of insulation levels of equipment or installations for three-phase AC systems. Its aim is to give guidance for the determination of the rated withstand voltages for ranges I and II of IEC 60071 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 document.

This document covers three-phase AC systems with nominal voltages above 1 kV, phase-to-earth, phase-to-phase and longitudinal insulation. It has the status of a horizontal standard in accordance with IEC Guide 108.

This edition includes the following significant technical changes with respect to the previous edition:

  • a) Clause 4 Concepts governing the insulation co-ordination has been added.
  • b) Subclause 5.3 has been revised, and Subclause 5.4 Detailed simulation has been added because it is widely applied in the recent practices of insulation coordination.
  • c) Special considerations for cable line and GIL/GIB have been added in Clause 9.
  • d) Annex K (informative) Application of line shunt reactor to limitation of TOV and SFO in high voltage overhead transmission lines has been added.
  • e) Annex L (informative) Calculation of lightning stroke rate and lightning outage rate has been added.
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