High-voltage switchgear and controlgear - Part 304: Classification of indoor enclosed switchgear and controlgear for rated voltages above 1 kV up to and including 52 kV related to the use in special service conditions with respect to condensation and pollution

IEC TS 62271-304:2019 applies to indoor enclosed switchgear and controlgear complying with IEC 62271-200 and IEC 62271-201, intended to be used in special service conditions with respect to condensation and pollution deviating from the normal service conditions specified in IEC 62271-1.
The test detailed in this document has been designed primarily to classify the electrical insulation performance of equipment having high-voltage electrical insulation exposed to indoor service conditions, mainly in presence of condensation. The assessment of mechanical components, such as mechanisms, interlocks and enclosure is also considered.
This second edition cancels and replaces the first edition published in 2008. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) the description of the several service conditions under condensation and pollution;
b) the classification of enclosed switchgear and controlgear, according to the testing procedure does not cover polluted service conditions PL and PH;
c) a wider description in Annex B of typical indoor environments based on ISO/IEC standards;
d) a new Annex C giving guidance on precautions to improve indoor operating conditions;
e) a new Annex D dedicated to the optional items such as records of mechanical characteristics;
f) a new Annex E, giving additional combinations of environments with condensation and pollution, as well as a proposal of testing procedure of ageing test, is provided to create experience on correlation between ageing effects in laboratory and ageing effects at site conditions.

Appareillage à haute tension - Partie 304: Classification de l’appareillage d’intérieur sous enveloppe pour tensions assignées supérieures à 1 kV et jusqu’à 52 kV inclus relatives à l’utilisation dans des conditions spéciales de service en ce qui concerne la condensation et la pollution

L’IEC TS 62271-304:2019 s’applique à l’appareillage d’intérieur sous enveloppe conforme à l’IEC 62271-200 et à l’IEC 62271-201, destiné à être utilisé dans des conditions spéciales de service en ce qui concerne la condensation et la pollution s’écartant des conditions normales de service spécifiées dans l’IEC 62271-1.
Les essais faisant l’objet du présent document ont été principalement conçus pour classifier les performances d’isolation électrique des appareillages ayant une isolation électrique haute tension exposée aux conditions de service d’intérieur, notamment en présence de condensation. L’évaluation des composants mécaniques tels que les mécanismes, les verrouillages et l’enveloppe est également considérée.
Cette deuxième édition annule et remplace la première édition parue en 2008. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l’édition précédente:
a) la description des différentes conditions de service sous condensation et pollution;
b) la classification de l’appareillage sous enveloppe, conformément à la procédure d’essai, ne couvre pas les conditions de service avec pollution PL et PH;
c) une description plus complète à l'Annexe B des environnements d’intérieur typiques basés sur des normes ISO/IEC;
d) une nouvelle Annexe C donnant des recommandations relatives aux précautions pour améliorer les conditions d’exploitation intérieures;
e) une nouvelle Annexe D fournissant les éléments facultatifs comme les enregistrements des caractéristiques mécaniques;
f) une nouvelle Annexe E offrant des combinaisons d’environnements supplémentaires avec condensation et pollution, ainsi qu’une proposition de procédure d’essai de vieillissement, afin de créer de l’expérience sur la corrélation entre les effets du vieillissement en laboratoire et les effets du vieillissement dans les conditions de site.

General Information

Status
Published
Publication Date
20-Mar-2019
Technical Committee
Current Stage
PPUB - Publication issued
Completion Date
21-Mar-2019
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IEC TS 62271-304:2019 - High-voltage switchgear and controlgear - Part 304: Classification of indoor enclosed switchgear and controlgear for rated voltages above 1 kV up to and including 52 kV related to the use in special service conditions with respect to condensation and pollution
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IEC TS 62271-304
Edition 2.0 2019-03
TECHNICAL
SPECIFICATION
SPECIFICATION
TECHNIQUE
colour
inside
High-voltage switchgear and controlgear –
Part 304: Classification of indoor enclosed switchgear and controlgear for rated
voltages above 1 kV up to and including 52 kV related to the use in special
service conditions with respect to condensation and pollution
Appareillage à haute tension –
Partie 304: Classification de l’appareillage d’intérieur sous enveloppe pour
tensions assignées supérieures à 1 kV et jusqu’à 52 kV inclus relatives à
l’utilisation dans des conditions spéciales de service en ce qui concerne la
condensation et la pollution
IEC TS 62271-304:2019-03(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC TS 62271-304
Edition 2.0 2019-03
TECHNICAL
SPECIFICATION
SPECIFICATION
TECHNIQUE
colour
inside
High-voltage switchgear and controlgear –
Part 304: Classification of indoor enclosed switchgear and controlgear for rated
voltages above 1 kV up to and including 52 kV related to the use in special
service conditions with respect to condensation and pollution
Appareillage à haute tension –
Partie 304: Classification de l’appareillage d’intérieur sous enveloppe pour
tensions assignées supérieures à 1 kV et jusqu’à 52 kV inclus relatives à
l’utilisation dans des conditions spéciales de service en ce qui concerne la
condensation et la pollution
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.130.10 ISBN 978-2-8322-6674-8

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC TS 62271-304:2019 © IEC 2019
CONTENTS

FOREWORD ........................................................................................................................... 4

1 Scope .............................................................................................................................. 6

2 Normative references ...................................................................................................... 6

3 Terms and definitions ...................................................................................................... 6

4 Definition of indoor service conditions under condensation and pollution ......................... 7

5 Classification of enclosed switchgear and controlgear ..................................................... 8

6 Test procedure for classification ...................................................................................... 8

7 Test facilities and associated requirements ................................................................... 10

7.1 Climatic test room ................................................................................................. 10

7.2 Measurement and control requirements ................................................................ 10

7.3 Energizing facilities ............................................................................................... 10

7.4 Information to be included in the test report .......................................................... 10

8 Arrangement of the equipment for test ........................................................................... 11

9 Ageing test .................................................................................................................... 11

9.1 Level 1 ageing test ................................................................................................ 11

9.2 Level 2 ageing test ................................................................................................ 12

10 Electrical assessment after ageing test .......................................................................... 13

10.1 General ................................................................................................................. 13

10.2 Criteria to pass the tests ....................................................................................... 14

Annex A (informative) Climatic test room ............................................................................. 15

Annex B (informative) Typical indoor environments .............................................................. 16

B.1 General ................................................................................................................. 16

B.2 Pollution ............................................................................................................... 16

Annex C (informative) Typical precautions to improve indoor operating conditions ............... 20

C.1 General ................................................................................................................. 20

C.2 Precautions for operating room ............................................................................. 20

Annex D (informative) Mechanical assessment .................................................................... 21

Annex E (informative) Pollution testing conditions, parameters, and procedure .................... 22

E.1 General ................................................................................................................. 22

E.2 Proposal for new classes ...................................................................................... 22

E.3 Testing procedure ................................................................................................. 22

E.3.1 Testing conditions ......................................................................................... 22

E.3.2 Testing parameters ........................................................................................ 23

E.3.3 Testing procedure .......................................................................................... 23

Bibliography .......................................................................................................................... 26

Figure 1 – Flow chart for classification testing procedure ........................................................ 9

Figure 2 – Climatic conditions for ageing test for level 1 and electrical assessment .............. 12

Figure 3 – Power-frequency voltage test sequences with high humidity after ageing

test ...................................................................................................................................... 14

Figure A.1 – Climatic test room ............................................................................................. 15

Figure E.1 – Test cycle ......................................................................................................... 24

Table B.1 – Examples of typical environments (IEC TS 60815-1, IEC 60721-3-3) ................. 17

---------------------- Page: 4 ----------------------
IEC TS 62271-304:2019 © IEC 2019 – 3 –

Table B.2 – Concentrations of some of the most important pollutants in different types

of environments (Annex B of ISO 9223:2012 [8], IEC 60721-3-3) .......................................... 18

Table B.3 – Deposits of some of the most important pollutants in different types of

environments (Annex B of ISO 9223:2012 [8], IEC TS 60815-1, IEC 60721-3-3,

IEC 60721-2-5[7]) ................................................................................................................. 19

Table C.1 – Typical precautions to improve indoor operating conditions ................................ 20

---------------------- Page: 5 ----------------------
– 4 – IEC TS 62271-304:2019 © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 304: Classification of indoor enclosed switchgear and controlgear for
rated voltages above 1 kV up to and including 52 kV related to the use in
special service conditions with respect to condensation and pollution
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

international co-operation on all questions concerning standardization in the electrical and electronic fields. To

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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

The main task of IEC technical committees is to prepare International Standards. In

exceptional circumstances, a technical committee may propose the publication of a Technical

Specification when

• the required support cannot be obtained for the publication of an International Standard,

despite repeated efforts, or

• the subject is still under technical development or where, for any other reason, there is the

future but no immediate possibility of an agreement on an International Standard.

Technical Specifications are subject to review within three years of publication to decide

whether they can be transformed into International Standards.

IEC 62771-304, which is a Technical Specification, has been prepared by subcommittee 17C:

Assemblies, of IEC technical committee 17: High-voltage switchgear and controlgear.

---------------------- Page: 6 ----------------------
IEC TS 62271-304:2019 © IEC 2019 – 5 –

This second edition cancels and replaces the first edition published in 2008. This edition

constitutes a technical revision.

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

edition:

a) the description of the several service conditions under condensation and pollution;

b) the classification of enclosed switchgear and controlgear, according to the testing

procedure does not cover polluted service conditions P and P ;
L H

c) a wider description in Annex B of typical indoor environments based on ISO/IEC

standards;

d) a new Annex C giving guidance on precautions to improve indoor operating conditions;

e) a new Annex D dedicated to the optional items such as records of mechanical
characteristics;

f) a new Annex E, giving additional combinations of environments with condensation and

pollution, as well as a proposal of testing procedure of ageing test, is provided to create

experience on correlation between ageing effects in laboratory and ageing effects at site

conditions.
The text of this Technical Specification is based on the following documents:
Draft TS Report on voting
17C/679/DTS 17C/691/RVDTS

Full information on the voting for the approval of this Technical Specification can be found in

the report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all the parts in the IEC 62271 series, under the general title High-voltage switchgear

and controlgear, can be found on the IEC website.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates

that it contains colours which are considered to be useful for the correct

understanding of its contents. Users should therefore print this document using a

colour printer.
---------------------- Page: 7 ----------------------
– 6 – IEC TS 62271-304:2019 © IEC 2019
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 304: Classification of indoor enclosed switchgear and controlgear for
rated voltages above 1 kV up to and including 52 kV related to the use in
special service conditions with respect to condensation and pollution
1 Scope

This part of IEC 62271, which is a Technical Specification, applies to indoor enclosed

switchgear and controlgear complying with IEC 62271-200 and IEC 62271-201, intended to be

used in special service conditions with respect to condensation and pollution deviating from

the normal service conditions specified in IEC 62271-1.

The test detailed in this document has been designed primarily to classify the electrical

insulation performance of equipment having high-voltage electrical insulation exposed to

indoor service conditions, mainly in presence of condensation. The assessment of mechanical

components, such as mechanisms, interlocks and enclosure is also considered.

In this document, the term "equipment" is used in accordance with the scope for an "enclosed

assembly of switchgear and controlgear" (see IEC 60050-441:2000, 441-12- 02).
2 Normative references

The following documents are referred to in the text in such a way that some or all of their

content constitutes requirements of this document. For dated references, only the edition

cited applies. For undated references, the latest edition of the referenced document (including

any amendments) applies.

IEC 60060-1:2010, High-voltage test techniques – Part 1: General definitions and test

requirements

IEC 60721-3-3, Classification of environmental conditions – Part 3: Classification of groups of

environmental parameters and their severities – Section 3: Stationary use at weatherprotected

locations

IEC TS 60815-1, Selection and dimensioning of high-voltage insulators intended for use in

polluted conditions – Part 1: Definitions, information and general principles

IEC 62271-1:2017, High-voltage switchgear and controlgear – Part 1: Common specifications

for alternating current switchgear and controlgear

IEC 62271-200, High-voltage switchgear and controlgear – Part 200: AC metal-enclosed

switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV

IEC 62271-201, High-voltage switchgear and controlgear – Part 201: AC solid-insulation

enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including

52 kV
3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 62271-1 apply.

---------------------- Page: 8 ----------------------
IEC TS 62271-304:2019 © IEC 2019 – 7 –

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
4 Definition of indoor service conditions under condensation and pollution

Indoor equipment is designed to be installed in an operating room inside a building or other

housing and thus has a certain level of protection from the outdoor environmental conditions.

In addition of the protection given by the building or other housing construction, precautions

(see Annex C) to minimize the amount of deposits inside the switchgear and controlgear can

be taken by the choice of an appropriate degree of protection of the enclosed switchgear and

controlgear.

Condensation can occur due to rapid temperature changes inside the operating room.

Pollution inside the operating room can be present depending on location and surrounding

activity. In addition, the occurrence of condensation and the site pollution severity inside the

operating room depend on the layout and the protection given by the building or other housing

construction.

The presence of condensation and pollution has the potential to impact the voltage withstand

capability of clearances and creepage distances, and possibly the insulating material itself.

The concern is that there may be the creation of a full or partial conductive path between live

parts or between live parts and conductive parts not intended to be live (enclosure, etc.).

In this document, the indoor service conditions with respect to condensation and pollution

around the enclosed switchgear and controlgear are defined, with typical examples:

: Condensation does not normally occur (not more than twice a year)
• Rooms with continuous humidity and/or temperature control in order to avoid
condensation. The building or other housing provides protection from daily
variations in outside climate.

• Rooms not having humidity or temperature control. Nevertheless, the building or

other housing construction provides protection from daily variations in outside
climate, and condensation is not more than twice a year.
C : Non-frequent condensation (not more than twice a month)

• Rooms not having humidity or temperature control. The building or other housing

construction provides protection from daily variations in outside climate, but
condensation cannot be excluded.
C : Frequent condensation (more than twice a month)

• Rooms not having humidity nor temperature control. The building or other housing

provides only minimal protection from daily variations of outside climate, so that

frequent condensation may occur.

P : Very light pollution (as given in 4.1.2, item d), of IEC 62271-1:2017). The ambient air

of the operating room is not significantly polluted by dust, smoke, corrosive and/or

flammable gases, vapours or salt and would be considered as having site pollution

severity class (SPS) “very light” according to IEC TS 60815-1.
• Rooms in areas without significant pollution.
---------------------- Page: 9 ----------------------
– 8 – IEC TS 62271-304:2019 © IEC 2019

• Rooms in areas with pollution (see Annex B) with precautions against pollution (see

Annex C) to recover indoor normal service conditions.
• Rooms with precautions against pollution (see Annex C). The building or other
housing construction provides adapted protection from outside pollution. The
control of the air conditions may be switched off for periods.

P : Light pollution is considered as site pollution severity class (SPS) “light” according to

IEC TS 60815-1 for solid deposit and/or pollution classification 3C1 according to

IEC 60721-3-3.
• Rooms without precautions against pollution. The building or other housing

construction is exposed to ambient air in rural and some urban areas with industrial

activities or with moderate traffic.
P : Heavy pollution (any pollution level exceeding P )
H L
• Rooms without precautions against pollution. The building or other housing

construction is exposed to ambient air in urban areas with industrial activities or

with heavy traffic.
5 Classification of enclosed switchgear and controlgear

Classification of enclosed switchgear and controlgear for use in special service conditions

with respect to condensation, within this document, is limited to equipment intended for use in

a polluted environment classified as P . The available classes are:
Class 0: C P
0 0
Class 1: C P
L 0
Class 2: C P
H 0

Test procedures are defined to demonstrate conformance with the requirements of C and C .

L H
Class 0 corresponds to normal indoor service conditions defined in IEC 62271-1.

Most of the existing artificial pollution testing procedures [2] [3] [4] [5] are mainly dedicated

to glass, ceramic, and polymeric insulators exposed to outdoor service conditions. There is no

mature testing methodology, representative of ageing under polluted indoor service

conditions. Therefore, no testing procedure is provided in this document for polluted

environments P and P .
L H

However, Annex E gives other possible combinations of environments with condensation and

pollution, and a proposal for testing procedure of ageing test, in order to create experience on

correlation between ageing effects in laboratory and ageing effects at site conditions.

Pollution at the site should be recorded.
6 Test procedure for classification

Class 0 is considered to be equivalent to the indoor normal service conditions specified in

IEC 62271-1, therefore no test is required.

Satisfactory performance under special service conditions of equipment complying with

Class 1 or 2 is verified by testing the equipment.

Enclosed switchgear and controlgear is considered to belong to Class 1 if it is subjected to

the level 1 ageing test according to 9.1 and satisfies the criteria of the electrical assessment.

Optional mechanical assessment is described in Annex D.
—————————
Numbers in square brackets refer to the Bibliography.
---------------------- Page: 10 ----------------------
IEC TS 62271-304:2019 © IEC 2019 – 9 –

Enclosed switchgear and controlgear is considered to belong to Class 2 if it is submitted to

the level 2 ageing test according to 9.2 and satisfies the criteria of the electrical assessment.

Optional mechanical assessment is described in Annex D.

The level 1 and level 2 ageing tests require the repeated application of identical cycles

followed by the electrical assessment. Optional mechanical assessment is described in

Annex D. The level 2 ageing test is identical to the level 1 ageing test except that for level 2 a

larger number of cycles is to be applied.
This classification procedure is illustrated in the flow chart, Figure 1.
Figure 1 – Flow chart for classification testing procedure
---------------------- Page: 11 ----------------------
– 10 – IEC TS 62271-304:2019 © IEC 2019
7 Test facilities and associated requirements
7.1 Climatic test room

A climatic test room is required which shall be of sufficient size to accommodate the

equipment to be tested. The equipment shall be installed in the climatic test room at a height

of not less than 0,5 m from the ground in a manner to permit the circulation of the ambient air.

The clearance between the walls and ceiling of the test room and the test object shall be more

than 1,0 m. When this requirement cannot be met, the laboratory shall provide evidence that

the ambient conditions meet the requirements according to 7.2.

Precautions shall be taken to prevent condensed water on the walls and ceiling of the test

chamber from f
...

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