SIST EN 50089:2023

High-Voltage switchgear and controlgear - Insulating pressurised partitions for gas filled metal enclosures

This document applies to pressurized partitions used in indoor and outdoor installations of high-voltage AC and DC switchgear and controlgear with rated voltages (Ur) above 1 kV AC / 1,5 kV DC and with design pressure higher than 300 kPa, where the gas is used principally for its dielectric and/or arc-quenching properties.
Gases with insulating properties are dry air, inert gases, for example sulphur hexafluoride or nitrogen or a mixture of such gases.
The partitions comprise pressurized barriers in electrical equipment not necessarily limited to the following examples:
—   circuit-breakers;
—   switch-disconnectors;
—   disconnectors;
—   earthing switches;
—   current transformers;
—   voltage transformers;
—   surge arrestors;
—   busbars and connections;
—   cable connections / terminations
—   cable bushings
—   etc.
Partitions which are only pressurized from one side are also covered.
1 kV AC / 1,5 kV DC means it is valid for the apparatus applied and where the partitions are installed, however, the application of voltages below 1 kV AC / 1,5 kV DC as in e.g. current and voltage transformer are not excluded.
This document does not apply to high voltage bushings (see EN 60137, EN 61462 and EN 62155).

Hochspannungs-Schaltgeräte und -Schaltanlagen – Isolierende, druckbeaufschlagte Zwischenwände für gasgefüllte metallgekapselte Anlagen

Appareillage à haute tension - Cloisons isolées sous pression pour enveloppes métalliques sous pression de gaz

Le présent document s'applique aux cloisons sous pression utilisées dans les installations intérieures et extérieures d'appareillages à haute tension en courant alternatif et en courant continu, de tensions assignées (Ur) supérieures à 1 kV en courant alternatif/1,5 kV en courant continu et de pression de calcul supérieure à 300 kPa, où le gaz est principalement utilisé pour ses propriétés diélectriques et/ou d'extinction des arcs.
Les gaz qui ont des propriétés isolantes sont l'air sec, les gaz inertes tels que l'hexafluorure de soufre ou l'azote, ou un mélange de ces gaz.
Les cloisons sont équipées de barrières sous pression dans des équipements électriques tels que les suivants (la liste n'étant pas nécessairement exhaustive):
—   disjoncteurs;
—   interrupteurs-sectionneurs;
—   sectionneurs;
—   sectionneur de terre;
—   transformateurs de courant;
—   transformateurs de tension;
—   parafoudres;
—   jeux de barres et raccordements;
—   raccordements/extrémités de câbles;
—   traversées de câbles;
—   etc.
Les cloisons qui ne sont sous pression que d'un côté sont également couvertes.
1 kV en courant alternatif/1,5 kV en courant continu signifient que la valeur est valable pour l'appareil utilisé; toutefois, lorsque les cloisons sont installées, l'application de tensions inférieures à 1 kV en courant alternatif/1,5 kV en courant continu (dans un transformateur de courant et de tension, par exemple) n'est pas exclue.
Le présent document ne s'applique pas aux traversées haute tension (voir EN 60137, EN 61462 et EN 62155).

Visokonapetostne stikalne in krmilne naprave - Tlačno izolirane predelne stene za kovinska ohišja, napolnjena s plinom

Ta dokument se uporablja za tlačne predelne stene, ki se uporabljajo v notranjih in zunanjih namestitvah visokonapetostnih stikalnih oziroma krmilnih naprav z izmeničnim in enosmernim tokom ter nazivno napetostjo (Ur), večjo od 1 kV AC/1,5 kV DC, in konstrukcijskim tlakom, večjim od 300 kPa, pri čemer se plin uporablja predvsem zaradi njegovih dielektričnih lastnosti in/ali lastnosti gašenja obloka.
Plini z izolacijskimi lastnostmi so suh zrak, inertni plini (npr. žveplov heksafluorid ali dušik) ali mešanica tovrstnih plinov.
Predelne stene zajemajo tlačne pregrade v električni opremi, ki niso nujno omejene na naslednje primere:
–   odklopniki;
–   stikala/ločilna stikala;
–   ločilniki;
–   ozemljitvena stikala;
–   tokovni transformatorji;
–   napetostni transformatorji;
–   prenapetostni odvodniki;
–   zbiralke in priključki;
–   kabelske povezave/priključki;
–   kabelske uvodnice;
–   itd.
Zajete so tudi predelne stene, ki so pod tlakom samo z ene strani.
Oznaka 1 kV AC/1,5 kV DC pomeni, da je veljavno za napravo, ki se uporablja, in mesta nameščenih predelnih sten; vendar uporaba napetosti, nižjih od 1 kV AC/1,5 kV DC (kot npr. v tokovnem in napetostnem transformatorju) ni izključena.
Ta dokument se ne uporablja za visokonapetostne kabelske uvodnice (glej standarde EN 60137, EN 61462 in EN 62155).

General Information

• Status: Published
• Public Enquiry End Date: 02-Sep-2021
• Publication Date: 14-Nov-2022
• ICS: 29.130.10 - High voltage switchgear and controlgear
• Technical Committee: SKA - Switchgear and control gear
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 08-Nov-2022
• Due Date: 13-Jan-2023
• Completion Date: 15-Nov-2022
• Ref Project: EN 50089:2022 - High-Voltage switchgear and controlgear - Insulating pressurised partitions for gas filled metal enclosures

Relations

• Revised: SIST EN 50089:1995 - Cast resin partitions for metal enclosed gas-filled high-voltage switchgear and controlgear
• Effective Date: 20-Aug-2019
• Replaces: SIST EN 50089:1995 - Cast resin partitions for metal enclosed gas-filled high-voltage switchgear and controlgear
• Effective Date: 08-Nov-2022

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 50089:2023
01-januar-2023
Nadomešča:
SIST EN 50089:1995
SIST EN 50089:2015
Visokonapetostne stikalne in krmilne naprave - Tlačno izolirane predelne stene za
kovinska ohišja, napolnjena s plinom
High-Voltage switchgear and controlgear - Insulating pressurised partitions for gas filled
metal enclosures
Hochspannungs-Schaltgeräte und -Schaltanlagen – Isolierende, druckbeaufschlagte
Zwischenwände für gasgefüllte metallgekapselte Anlagen
Appareillage à haute tension - Cloisons isolées sous pression pour enveloppes
métalliques sous pression de gaz
Ta slovenski standard je istoveten z: EN 50089:2022
ICS:
29.130.10 Visokonapetostne stikalne in High voltage switchgear and
krmilne naprave controlgear
SIST EN 50089:2023 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 50089:2023

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SIST EN 50089:2023


EUROPEAN STANDARD EN 50089

NORME EUROPÉENNE

EUROPÄISCHE NORM October 2022
ICS 29.130.10 Supersedes EN 50089:1992; EN 50089:1992/A1:1994
English Version
High-Voltage switchgear and controlgear - Insulating pressurised
partitions for gas filled metal enclosures
Appareillage à haute tension - Cloisons isolées sous Hochspannungs-Schaltgeräte und -Schaltanlagen -
pression pour enveloppes métalliques sous pression de gaz Isolierende, druckbeaufschlagte Zwischenwände für
gasgefüllte metallgekapselte Anlagen
This European Standard was approved by CENELEC on 2022-09-05. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.



European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN 50089:2022 E

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SIST EN 50089:2023
EN 50089:2022 (E)
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Quality assurance . 8
5 Normal and special service conditions . 8
6 Materials and their selection . 8
7 Design . 9
7.1 General . 9
7.2 Considerations for design . 9
7.3 Stresses due to pressure . 9
8 Manufacture and workmanship . 9
8.1 Consultation between manufacturer and producer . 9
8.2 Manufacturing technique .10
8.3 Geometry and dimensions .10
8.4 Mechanical properties .10
8.5 Metallic inserts .11
8.6 Surface finish .11
9 Inspection, testing and certification .11
9.1 Type test .11
9.1.1 General .11
9.1.2 Bursting test procedure .11
9.2 Inspection and routine tests .11
9.2.1 General .11
9.2.2 Visual inspection .12
9.2.3 Routine pressure test .12
9.2.4 Production consistency burst pressure test .12
9.2.5 Additional tests .13
9.2.6 Reporting of non-destructive test examinations .14
9.3 Certification .14
9.3.1 Design specification, drawings and data sheets.14
9.3.2 Certificate .14
9.3.3 Marking .14
9.3.4 Final inspection .14
Annex A (informative) A-deviations .15
Bibliography .16

2

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SIST EN 50089:2023
 EN 50089:2022 (E)
European foreword
This document (EN 50089:2022) has been prepared by CLC/TC 17AC “High-voltage switchgear and
controlgear”.
The following dates are fixed:
• latest date by which this document has to be (dop) 2023-09-05
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) 2025-09-05
conflicting with this document have to be
withdrawn
This document supersedes EN 50089:1992 and all of its amendments and corrigenda (if any).
EN 50089:2022 includes the following significant technical changes with respect to EN 50089:1992:
— Title made more general;
— Modification of scope of voltage, pressure level and gas mixtures;
— Addition of more specific terms and definitions (e.g. partition)
— Material not limited only to cast resin;
— Mechanical properties;
— Possibilities of reduction of test pressures.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A complete
listing of these bodies can be found on the CENELEC website.
3

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SIST EN 50089:2023
EN 50089:2022 (E)
Introduction
This document has been revised by CENELEC Technical Committee 17AC “High-voltage switchgear and
controlgear”. It supplements the relevant product standards on gas-insulated switchgear and controlgear
providing specific requirements for partitions based on insulating material being part of pressurized high-voltage
switchgear and controlgear.
In this respect, this document, together with other EN and IEC documents, constitutes the exclusion of HV
switchgear from the scope of the Directive 2014/68/EU (superseding 97/23/EC) concerning pressure equipment.
Article 1, 2. (l) excludes “enclosures for high-voltage electrical equipment such as switchgear, controlgear,
transformers, and rotating machines” from the scope of the Directive.
This document covers the requirements for the design, construction, testing, inspection and certification of
partitions based on insulating material for gas-filled enclosures for use specifically in high-voltage switchgear
and controlgear, or for associated gas-filled equipment.
Special consideration is given to these partitions for the following reasons.
a) For electrical reasons the partitions need to be manufactured from an insulating material.
b) The partitions usually form the containment of electrical equipment, thus their shape is determined by
electrical rather than mechanical requirements. The mechanical requirements should be met in any case.
c) The enclosures in which the partitions are integrated are installed in restricted access areas and the
equipment is operated by instructed, authorized persons only.
d) The insulating material is generally qualified against decomposition products of SF6 and other insulating
gases. The thorough drying of gas-filling medium is fundamental for the satisfactory operation of the
electrical equipment. The gas is periodically checked. For this reason, no corrosion allowance is required
on the wall thickness of these partitions.
e) The enclosures are subjected to only small (in the relation to design pressure) fluctuations of pressure as
the gas-filling density will be maintained within close limits to ensure satisfactory insulating and arc-
quenching properties. Therefore, the partitions are not liable to fatigue due to pressure cycling.
Due to the foregoing reasons and to ensure maximum service continuity as well as to reduce the risk of moisture
and dust entering the enclosures which could endanger safe electrical operation of the switchgear, no pressure
tests should be carried out after installation and before placing in service and no periodic inspection of the
enclosure interiors or pressure tests should be carried out after the equipment is placed in service.
This document should be a base for a mutual agreement between a manufacturer of electrical equipment and
producer of partitions but not limited to it. Additional delivery and test instructions may be agreed between the
parties if necessary.
4

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SIST EN 50089:2023
 EN 50089:2022 (E)
1 Scope
This document applies to pressurized partitions used in indoor and outdoor installations of high-voltage AC and
DC switchgear and controlgear with rated voltages (Ur) above 1 kV AC / 1,5 kV DC and with design pressure
higher than 300 kPa, where the gas is used principally for its dielectric and/or arc-quenching properties.
The partitions comprise pressurized barriers in electrical equipment not necessarily limited to the following
examples:
— circuit-breakers;
— switch-disconnectors;
— disconnectors;
— earthing switches;
— current transformers;
— voltage transformers;
— surge arresters;
— busbars and connections;
— cable connections/terminations;
— cable bushings.
Partitions which are only pressurized from one side are also covered.
1 kV AC / 1,5 kV DC means it is valid for the apparatus applied and where the partitions are installed; however,
the application of voltages below 1 kV AC / 1,5 kV DC as in, for example, current and voltage transformers are
not excluded.
This document does not apply to high voltage bushings (see EN 60137, EN 61462 and EN 62155).
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.
EN 10204, Metallic products — Types of inspection documents
EN 62271-1, High-voltage switchgear and controlgear — Part 1: Common specifications for alternating current
switchgear and controlgear
EN IEC 62271-200:2021, 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 62271-200:2021)
EN IEC 62271-203:2022, High-voltage switchgear and controlgear — Part 203: AC gas-insulated metal-
enclosed switchgear for rated voltages above 52 kV (IEC 62271-203:2022)
EN ISO 527 (series), Plastics — Determination of tensile properties (ISO 527 series)
5

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SIST EN 50089:2023
EN 50089:2022 (E)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
3.1
gas-insulated metal-enclosed switchgear
GIS
metal-enclosed switchgear in which the insulation is obtained, at least partly, by an insulating gas or gas mixture
other than air at atmospheric pressure
Note 1 to entry: This term generally applies to high-voltage switchgear and controlgear.
Note 2 to entry: Three-phase enclosed gas-insulated switchgear applies to switchgear with the three phases enclosed in
a common enclosure.
Note 3 to entry: Single-phase enclosed gas-insulated switchgear applies to switchgear with each phase enclosed in single
independent enclosure.
[SOURCE: EN IEC 62271-203:2022, 3.102]
3.2
partition
gas tight support insulator of gas-insulated metal-enclosed switchgear separating two adjacent compartments
Note 1 to entry: Or an insulator in the gas compartment which is pressurized on one side and atmospheric pressure exists
at all times on the other side (e.g. enclosure of opening with cable bushings, cable terminations, viewports, earthing
insulations, instrument transformers terminals, etc.).
[SOURCE: EN IEC 62271-203:2022, 3.109]
3.3
enclosure
compartment as part of GIS retaining the insulating gas under the prescribed conditions necessary to maintain
safely the rated insulation level, protecting the equipment against external influences and providing a high
degree of protection to personnel
3.4
manufacturer
organization that is responsible for the design of the partition and the production of the GIS
Note 1 to entry: In this document, this is mostly the GIS manufacturer or the cable manufacturer or cable accessory
supplier.
3.5
producer
organization that produces the partition
6

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SIST EN 50089:2023
 EN 50089:2022 (E)
3.6
design pressure of partitions
relative pressure across the partition
Note 1 to entry: It is at least equal to the maximum differential pressure across the partition during maintenance activities.
Note 2 to entry: The transient pressure occurring during and after a breaking operation (e.g. circuit-breaker) is not to be
considered in the determination of the design pressure.
Note 3 to entry: It is at least equal to the maximum pressure in the enclosure at the highest temperature that the gas used
for insulation can reach under specified maximum service conditions.
[SOURCE: EN IEC 62271-203:2022, 3.115, modified — term and definition changed slightly and Note 3 to entry
added]
3.7
design stress
maximum permissible stress on the partition imposed by conditions of operation, environment or test that
determine the (material) characteristics of a partition
3.8
routine test pressure of enclosures and partitions
relative pressure to which all enclosures and partitions are subjected after manufacturing
[SOURCE: EN IEC 62271-203:2022, 3.117]
3.9
type test pressure of enclosures and partitions
relative pressure to which all enclosures and partitions are sub
...

SLOVENSKI STANDARD
oSIST prEN 50089:2021
01-september-2021
Deli iz ulitih umetnih materialov za plinske visokonapetostne stikalne in krmilne
naprave s kovinskim ohišjem
Cast resin partitions for metal enclosed gas-filled high-voltage switchgear and
controlgear
Giessharz-Zwischenwände für metallgekapselte gasgefüllte Hochspannungs-
Schaltgeräte und -Schaltanlagen
Appareillage à haute tension - Cloisons en matériau isolant pour enveloppes métalliques
sous pression de gaz
Ta slovenski standard je istoveten z: prEN 50089
ICS:
29.130.10 Visokonapetostne stikalne in High voltage switchgear and
krmilne naprave controlgear
oSIST prEN 50089:2021 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 50089:2021

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oSIST prEN 50089:2021

EUROPEAN STANDARD DRAFT
prEN 50089
NORME EUROPÉENNE

EUROPÄISCHE NORM

June 2021
ICS 29.130.10 Will supersede EN 50089:1992 and all of its
amendments and corrigenda (if any)
English Version
Cast resin partitions for metal enclosed gas-filled high-voltage
switchgear and controlgear
Appareillage à haute tension - Cloisons en matériau isolant Giessharz-Zwischenwände für metallgekapselte gasgefüllte
pour enveloppes métalliques sous pression de gaz Hochspannungs-Schaltgeräte und -Schaltanlagen
This draft European Standard is submitted to CENELEC members for enquiry.
Deadline for CENELEC: 2021-09-03.

It has been drawn up by CLC/TC 17AC.

If this draft becomes a European Standard, CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which
stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CENELEC in three official versions (English, French, German).
A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to
the CEN-CENELEC Management Centre has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.



European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Project: 70261 Ref. No. prEN 50089 E

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oSIST prEN 50089:2021
prEN 50089:2021 (E)
1 Contents
2 European foreword . 3
3 Introduction . 4
4 1 Scope . 5
5 2 Normative references . 5
6 3 Terms and definitions . 6
7 4 Quality assurance . 8
8 5 Normal and special service conditions . 8
9 6 Materials and their selection . 8
10 7 Design . 9
11 7.1 General . 9
12 7.2 Considerations for design . 9
13 7.3 Stresses due to pressure . 9
14 8 Manufacture and workmanship . 9
15 8.1 Consultation between manufacturer and producer . 9
16 8.2 Manufacturing technique .10
17 8.3 Geometry and dimensions .10
18 8.4 Mechanical properties .10
19 8.5 Metallic inserts .11
20 8.6 Surface finish .11
21 9 Inspection, testing and certification .11
22 9.1 Type test .11
23 9.1.1 General .11
24 9.1.2 Bursting test procedure .11
25 9.2 Inspection and routine tests .11
26 9.2.1 General .11
27 9.2.2 Visual inspection .12
28 9.2.3 Routine pressure test .12
29 9.2.4 Production consistency burst pressure test .12
30 Table 1 — Reduction of burst tests .12
31 9.2.5 Additional tests .12
32 9.2.6 Reporting of non-destructive test examinations .13
33 9.3 Certification .13
34 9.3.1 Design specification, drawings and data sheets.13
35 9.3.2 Certificate .13
36 9.3.3 Marking .13
37 9.3.4 Final inspection .13
38 Annex A (informative) A-deviations .14
39 Bibliography .15
40
2

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oSIST prEN 50089:2021
 prEN 50089:2021 (E)
41 European foreword
42 This document (prEN 50089:2021) has been prepared by CLC/TC 17AC “High-voltage switchgear and
43 controlgear”.
44 This document is currently submitted to the Enquiry.
45 The following dates are proposed:
• latest date by which the existence of this (doa) dor + 6 months
document has to be announced at national
level
• latest date by which this document has to be (dop) dor + 12 months
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) dor + 36 months
conflicting with this document have to be (to be confirmed or
withdrawn modified when voting)
46 This document will supersede EN 50089:1992 and all of its amendments and corrigenda (if any).
47 This edition includes the following significant technical changes with respect to previous document:
48 — Title more generally
49 — Scope of voltage, pressure level and gas mixtures
50 — New: Terms and definitions more specifically (e.g. partition)
51 — Material not anymore only cast resin
52 — Mechanical properties
53 — Possibilities of reduction of routine pressure -
3

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oSIST prEN 50089:2021
prEN 50089:2021 (E)
54 Introduction
55 This document has been revised by CENELEC Technical Committee 17AC “High-voltage switchgear and
56 controlgear”. It supplements the relevant product standards on gas-insulated switchgear and controlgear
57 providing specific requirements for partitions based on insulating material being part of pressurized high-voltage
58 switchgear and controlgear.
59 In this respect, this document, together with other EN and IEC documents, constitutes the exclusion of HV
60 switchgear from the scope of the Directive 2014/68/EU (superseding 97/23/EC) concerning pressure equipment.
61 Article 1, 2. (l) excludes “enclosures for high-voltage electrical equipment such as switchgear, controlgear,
62 transformers, and rotating machines” from the scope of the Directive.
63 This document covers the requirements for the design, construction, testing, inspection and certification of
64 partitions based on insulating material for gas-filled enclosures for use specifically in high-voltage switchgear
65 and controlgear, or for associated gas-filled equipment.
66 Special consideration is given to these partitions for the following reasons.
67 a) For electrical reasons the partitions need to be manufactured from an insulating material.
68 b) The partitions usually form the containment of electrical equipment, thus their shape is determined by
69 electrical rather than mechanical requirements. The mechanical requirements should be met in any case.
70 c) The enclosures in which the partitions are integrated are installed in restricted access areas and the
71 equipment is operated by instructed, authorized persons only.
72 d) The insulating material is generally qualified against decomposition products of SF6 and other insulating
73 gases. The thorough drying of gas-filling medium is fundamental for the satisfactory operation of the
74 electrical equipment. The gas is periodically checked. For this reason, no corrosion allowance is required
75 on the wall thickness of these partitions.
76 e) The enclosures are subjected to only small (in the relation to design pressure) fluctuations of pressure as
77 the gas-filling density will be maintained within close limits to ensure satisfactory insulating and arc-
78 quenching properties. Therefore, the partitions are not liable to fatigue due to pressure cycling.
79 Due to the foregoing reasons and to ensure maximum service continuity as well as to reduce the risk of moisture
80 and dust entering the enclosures which could endanger safe electrical operation of the switchgear, no pressure
81 tests should be carried out after installation and before placing in service and no periodic inspection of the
82 enclosure interiors or pressure tests should be carried out after the equipment is placed in service.
83 This document should be a base for a mutual agreement between a manufacturer of electrical equipment and
84 producer of partitions but not limited to it. Additional delivery and test instructions may be agreed between the
85 parties if necessary.
4

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oSIST prEN 50089:2021
 prEN 50089:2021 (E)
86 1 Scope
87 This document applies to pressurized partitions used in indoor and outdoor installations of high-voltage AC and
88 DC switchgear and controlgear with rated voltages (Ur) above 1 kV AC / 1,5 kV DC and with design pressure
89 higher than 300 kPa, where the gas is used principally for its dielectric and/or arc-quenching properties.
90 Gases with insulating properties are dry air, inert gases, for example sulphur hexafluoride or nitrogen or a
91 mixture of such gases.
92 The partitions comprise pressurized barriers in electrical equipment not necessarily limited to the following
93 examples:
94 — circuit-breakers;
95 — switch-disconnectors;
96 — disconnectors;
97 — earthing switches;
98 — current transformers;
99 — voltage transformers;
100 — surge arrestors;
101 — busbars and connections;
102 — cable connections / terminations
103 — cable bushings
104 — etc.
105 Partitions which are only pressurized from one side are also covered.
106 1 kV AC / 1,5 kV DC means it is valid for the apparatus applied and where the partitions are installed, however,
107 the application of voltages below 1 kV AC / 1,5 kV DC as in e.g. current and voltage transformer are not
108 excluded.
109 This document does not apply to high voltage bushings (see EN 60137, EN 61462 and EN 62155).
110 2 Normative references
111 The following documents are referred to in the text in such a way that some or all of their content constitutes
112 requirements of this document. For dated references, only the edition cited applies. For undated references, the
113 latest edition of the referenced document (including any amendments) applies.
114 EN 10204, Metallic products - Types of inspection documents
115 EN 62271-1, High-voltage switchgear and controlgear - Part 1: Common specifications for alternating current
116 switchgear and controlgear (IEC 62271-1)
117 EN 62271-200:2012, High-voltage switchgear and controlgear - Part 200: AC metal-enclosed switchgear and
118 controlgear for rated voltages above 1 kV and up to and including 52 kV (IEC 62271-200:2011)
119 prEN 62271-203:2021, High-voltage switchgear and controlgear - Part 203: Gas-insulated metal-enclosed
120 switchgear for rated voltages above 52 kV (IEC 62271-203:202X)
121 EN ISO 527 series, Plastics - Determination of tensile properties (ISO 527 series)
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oSIST prEN 50089:2021
prEN 50089:2021 (E)
122 3 Terms and definitions
123 For the purposes of this document, the following terms and definitions apply.
124 ISO and IEC maintain terminological databases for use in standardization at the following addresses:
125 — ISO Online browsing platform: available at https://www.iso.org/obp
126 — IEC Electropedia: available at https://www.electropedia.org/
127 3.1
128 gas-insulated metal-enclosed switchgear
129 GIS
130 metal-enclosed switchgear in which the insulation is obtained, at least partly, by an insulating gas or gas mixture
131 other than air at atmospheric pressure
132 Note 1 to entry: This term generally applies to high-voltage switchgear and controlgear.
133 Note 2 to entry: Three-phase enclosed gas-insulated switchgear applies to switchgear with the three phases enclosed in
134 a common enclosure.
135 Note 3 to entry: Single-phase enclosed gas-insulated switchgear applies to switchgear with each phase enclosed in single
136 independent enclosure.
137 [SOURCE: prEN IEC 62271-203:2021, 3.102]
138 3.2
139 partition
140 gas tight support insulator of gas-insulated metal-enclosed switchgear separating two adjacent compartments
141 Note 1 to entry: Or an insulator in the gas compartment which is pressurized on one side and atmospheric pressure exists
142 at all times on the other side (e.g. enclosure of opening with cable bushings, cable terminations, viewports, earthing
143 insulations, instrument transformers terminals, etc.)
144 [SOURCE: prEN IEC 62271-203:2021, 3.109]
145 3.3
146 enclosure
147 compartment as part of GIS retaining the insulating gas under the prescribed conditions necessary to maintain
148 safely the rated insulation level, protecting the equipment against external influences and providing a high
149 degree of protection to personnel
150 3.4
151 manufacturer
152 organization that is responsible for the design of the partition and the production of the GIS
153 Note 1 to entry: In this document, this is mostly the GIS manufacturer or the cable manufacturer or cable accessory
154 supplier.
155 3.5
156 producer
157 organisation that produces the partition
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oSIST prEN 50089:2021
 prEN 50089:2021 (E)
158 3.6
159 design pressure of partitions
160 relative pressure across the partition
161 Note 1 to entry: It is at least equal to the maximum differential pressure across the partition during maintenance activities.
162 Note 2 to entry: The transient pressure occurring during and after a breaking operation (e.g. circuit-breaker) is not to be
163 considered in the determination of the design pressure.
164 Note 3 to entry: the significant pressure is at least equal to the maximum pressure in the enclosure at the highest
165 temperature that the gas used for insulation can reach under specified maximum service conditions.
166 [SOURCE: prEN IEC 62271-203:2021, 3.115]
167 3.7
168 design stress
169 maximum permissible stress on the partition imposed by conditions of operation, environment or test that
170 determine the (material) characteristics of a partition
171 3.8
172 normal load
173 load for which the occurrence and level c
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