IEC 60071-2:2018 PDF

Insulation co-ordination - Part 2: Application guidelines

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Title (English):

IEC 60071-2:2018

Insulation co-ordination - Part 2: Application guidelines

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 482
Publication date:: March 16, 2018
Edition:: IEC IS 60071 edition 4 version 1
ICS:: 29.080.30

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Description (English):

IEC 60071-2:2018 constitutes application guidelines and deals with the selection of insulation levels of equipment or installations for three-phase electrical systems. It gives 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. It covers three-phase systems with nominal voltages above 1 kV. This edition includes the following significant technical changes with respect to the previous edition: a) the annex on clearance in air to assure a specified impulse withstand voltage installation is deleted because the annex in IEC 60071-1 is overlapped; b) 4.2 and 4.3 on surge arresters are updated; c) 4.3.5 on very-fast-front overvoltages is revised. Annex J on insulation co-ordination for very-fast-front overvoltages in UHV substations is added; d) Annex H on atmospheric correction – altitude correction is added. e) Annex I on evaluation method of non-standard lightning overvoltage shape is added. It has the status of a horizontal standard in accordance with IEC Guide 108.

Technical details

Technical committee: TC 28 - Insulation co-ordination
SKU: IEC 60071-2:2018

Abstract

Overview - IEC 60071-2:2018 (Insulation co‑ordination - Part 2: Application guidelines)

IEC 60071-2:2018 provides practical application guidance for insulation co‑ordination in three‑phase electrical systems with nominal voltages above 1 kV. It helps engineers and manufacturers select appropriate insulation levels and determine rated withstand voltages (for Ranges I and II of IEC 60071‑1), and to justify their association with standardized highest voltages for equipment. This edition is a horizontal standard (IEC Guide 108) and introduces important updates on surge arresters, very‑fast‑front overvoltages, altitude correction and evaluation of non‑standard lightning overvoltage shapes.

Key topics and technical requirements

Representative voltage stresses - classification and sources of continuous, temporary, slow‑front, fast‑front and very‑fast‑front overvoltages used for co‑ordination studies.
Selection of rated withstand voltages - procedures to determine co‑ordination, required and standard withstand voltages and related safety factors.
Insulation co‑ordination procedures - step‑by‑step methods for ranges I & II (including conversion factors and test voltage selection).
Surge arresters and protective devices - updated guidance on characteristics and application of MOSA, line surge arresters and spark gaps.
Very‑fast‑front overvoltages - revised treatment of VFF overvoltages and new Annex J on insulation co‑ordination for UHV substations.
Atmospheric/altitude correction - new Annex H providing altitude correction guidance affecting withstand voltages.
Non‑standard lightning shapes - new Annex I with methods to evaluate atypical lightning overvoltage waveforms.
Testing and standardization - overview of standard lightning and switching impulse tests, test conversion factors, and selection of type test procedures.
Special cases - dedicated guidance for overhead lines, substations, transferred overvoltages in transformers and practical examples (informative annexes).

Practical applications and users

Who uses IEC 60071‑2:

Power system designers and substation engineers selecting insulation coordination for transmission and distribution (U > 1 kV).
Utility planners and protection engineers evaluating surge protection and overvoltage exposure.
Equipment manufacturers and testing laboratories specifying and verifying rated withstand voltages and type tests.
Consultants performing risk assessments for UHV substations, overhead lines and transformer transfer phenomena.

How it's used:

Define insulation levels and safety factors for equipment and installations.
Select and justify surge arresters and protection strategies.
Convert representative overvoltages into test voltages and interpret test results for acceptance.

Related standards (if applicable)

IEC 60071‑1 - Principles, ranges and general definitions for insulation co‑ordination (complements Part 2).
IEC Guide 108 - Horizontal standard status and applicability guidance.

Related standards

Mentioned in the description and other IEC standards

Abstract

Overview - IEC 60071-2:2018 (Insulation co‑ordination - Part 2: Application guidelines)

Key topics and technical requirements

Representative voltage stresses - classification and sources of continuous, temporary, slow‑front, fast‑front and very‑fast‑front overvoltages used for co‑ordination studies.
Selection of rated withstand voltages - procedures to determine co‑ordination, required and standard withstand voltages and related safety factors.
Insulation co‑ordination procedures - step‑by‑step methods for ranges I & II (including conversion factors and test voltage selection).
Surge arresters and protective devices - updated guidance on characteristics and application of MOSA, line surge arresters and spark gaps.
Very‑fast‑front overvoltages - revised treatment of VFF overvoltages and new Annex J on insulation co‑ordination for UHV substations.
Atmospheric/altitude correction - new Annex H providing altitude correction guidance affecting withstand voltages.
Non‑standard lightning shapes - new Annex I with methods to evaluate atypical lightning overvoltage waveforms.
Testing and standardization - overview of standard lightning and switching impulse tests, test conversion factors, and selection of type test procedures.
Special cases - dedicated guidance for overhead lines, substations, transferred overvoltages in transformers and practical examples (informative annexes).

Practical applications and users

Who uses IEC 60071‑2:

Power system designers and substation engineers selecting insulation coordination for transmission and distribution (U > 1 kV).
Utility planners and protection engineers evaluating surge protection and overvoltage exposure.
Equipment manufacturers and testing laboratories specifying and verifying rated withstand voltages and type tests.
Consultants performing risk assessments for UHV substations, overhead lines and transformer transfer phenomena.

How it's used:

Define insulation levels and safety factors for equipment and installations.
Select and justify surge arresters and protection strategies.
Convert representative overvoltages into test voltages and interpret test results for acceptance.

Related standards (if applicable)

IEC 60071‑1 - Principles, ranges and general definitions for insulation co‑ordination (complements Part 2).
IEC Guide 108 - Horizontal standard status and applicability guidance.

IEC 60071-2:2018 PDF

Technical details

Abstract

Overview - IEC 60071-2:2018 (Insulation co‑ordination - Part 2: Application guidelines)

Key topics and technical requirements

Practical applications and users

Related standards (if applicable)

Related standards

Abstract

Overview - IEC 60071-2:2018 (Insulation co‑ordination - Part 2: Application guidelines)

Key topics and technical requirements

Practical applications and users

Related standards (if applicable)

Related standards

Insulation co-ordination - Part 1: Definitions, principles and rules

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