SIST EN 50336:2021
(Main)Bushings for transformers and reactor cable boxes not exceeding 36 kV
Bushings for transformers and reactor cable boxes not exceeding 36 kV
This document is applicable to insulated bushings, excluding those plug-in bushings specified by EN 50180 series, for use in air insulated, shroud insulated and fully insulated cable boxes for liquid filled transformers and reactors for rated voltages up to 36 kV, and rated currents up to 4 000 A at frequencies from 15 Hz to 60 Hz.
Durchführungen für Kabelanschlusskästen von Transformatoren und Drosselspulen bis 36 kV
Traversées pour boîtes à câbles de transformateurs et bobines d'inductance ne dépassant pas 36 kV
Le présent document s'applique aux traversées isolées à l'exception des traversées de type embrochable spécifiées dans la série EN 50180, destinées à être utilisées dans les boîtes à câbles à isolement dans l'air, à isolement renforcé et totalement isolées des transformateurs remplis de liquide et des bobines d'inductance de tension assignée jusqu'à 36 kV et d'intensité assignée jusqu'à 4 000 A à des fréquences comprises entre 15 Hz et 60 Hz.
Skoznjiki za transformatorje in reaktorska kabelska ohišja do vključno 36 kV
General Information
RELATIONS
Standards Content (sample)
SLOVENSKI STANDARD
oSIST prEN 50336:2021
01-januar-2021
Skoznjiki za transformatorje in reaktorska kabelska ohišja do vključno 36 kV
Bushings for transformers and reactor cable boxes not exceeding 36 kV
Durchführungen für Kabelanschlusskästen von Transformatoren und Drosselspulen bis
36 kVTraversées pour boîtes à câbles de transformateurs et bobines d'inductance ne
dépassant pas 36 kV
Ta slovenski standard je istoveten z: prEN 50336
ICS:
29.080.20 Skoznjiki Bushings
29.180 Transformatorji. Dušilke Transformers. Reactors
oSIST prEN 50336:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 50336:2021
EUROPEAN STANDARD DRAFT
prEN 50336
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2020
ICS 29.080.20; 29.180 Will supersede EN 50336:2002 and all of its
amendments and corrigenda (if any)
English Version
Bushings for transformers and reactor cable boxes not
exceeding 36 kV
Traversées pour boîtes à câbles de transformateurs et Durchführungen für Kabelanschlusskästen von
bobines d'inductance ne dépassant pas 36 kV Transformatoren und Drosselspulen bis 36 kV
This draft European Standard is submitted to CENELEC members for enquiry.Deadline for CENELEC: 2021-01-29.
It has been drawn up by CLC/TC 36A.
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
© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Project: 68148 Ref. No. prEN 50336 E---------------------- Page: 3 ----------------------
oSIST prEN 50336:2021
prEN 50336:2020 (E)
11 Contents Page
12 European foreword ............................................................................................................................................. 3
13 1 Scope ...................................................................................................................................................... 4
14 2 Normative references ............................................................................................................................ 4
15 3 Terms and definitions ........................................................................................................................... 4
16 4 Requirements ......................................................................................................................................... 5
17 4.1 General Requirements .......................................................................................................................... 5
18 4.2 Ratings .................................................................................................................................................... 5
19 4.2.1 Standard values of rated voltage for ceramic insulators (U ) ........................................................... 5
20 4.2.2 Standard values of rated voltage for resin insulated bushings (U ) ................................................ 5
21 4.2.3 Standard values of rated current (I ) ................................................................................................... 5
22 4.3 Ceramic bushings .................................................................................................................................. 5
23 4.3.1 General Requirements .......................................................................................................................... 5
24 4.3.2 Clamping arrangements ........................................................................................................................ 6
25 4.3.3 Terminals ................................................................................................................................................ 6
26 4.4 Resin insulated bushings ..................................................................................................................... 7
27 4.4.1 General requirements ............................................................................................................................ 7
28 4.4.2 Type test (temperature cycle) ............................................................................................................... 7
29 4.4.3 Routine tests .......................................................................................................................................... 7
30 5 Ceramic busing dimensions ................................................................................................................. 8
31 5.1 Ceramic insulator .................................................................................................................................. 8
32 5.2 Clamping arrangement for ceramic insulators ................................................................................... 9
33 5.3 Bushing end terminal arrangement ................................................................................................... 11
34 6 Resin bushing dimensions ................................................................................................................. 15
35 Bibliography ...................................................................................................................................................... 17
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prEN 50336:2020 (E)
37 European foreword
38 This document (prEN 50336:2020) has been prepared by CLC/TC 36A “Insulated bushings”.
39 This document is currently submitted to the Enquiry.40 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)
41 This document will supersede EN 50336:2002 and all of its amendments and corrigenda (if any).
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prEN 50336:2020 (E)
42 1 Scope
43 This document is applicable to insulated bushings, excluding those plug-in bushings specified by
44 EN 50180 series, for use in air insulated, shroud insulated and fully insulated cable boxes for liquid filled
45 transformers and reactors for rated voltages up to 36 kV, and rated currents up to 4 000 A at frequencies from
46 15 Hz to 60 Hz.47 2 Normative references
48 The following documents are referred to in the text in such a way that some or all of their content constitutes
49 requirements of this document. For dated references, only the edition cited applies. For undated references,
50 the latest edition of the referenced document (including any amendments) applies.
51 EN 60137, Insulated bushings for alternating voltages above 1 000 V (IEC 60137)
52 EN 62155, Hollow pressurized and unpressurized ceramic and glass insulators for use in electrical equipment
53 with rated voltages greater than 1 000 V (IEC 62155)54 IEC 60296, Fluids for electrotechnical applications - Mineral insulating oils for electrical equipment
55 3 Terms and definitions56 For the purposes of this document, the following terms and definitions apply.
57 ISO and IEC maintain terminological databases for use in standardization at the following addresses:
58 — ISO Online browsing platform: available at https://www.iso.org/obp59 — IEC Electropedia: available at http://www.electropedia.org/
60 3.1
61 air insulated cable box
62 metallic weatherproof enclosure designed to protect the ends of cables and their associated bushings using
63 air as the primary source of insulation64 3.2
65 cast or moulded resin insulated bushing
66 bushing in which the major insulation consists of a cast or moulded organic material with or without an
67 inorganic filler68 [SOURCE: EN 60137:2017, 3.13]
69 3.3
70 ceramic, glass or analogous inorganic material bushing
71 bushing in which the major insulation consists of a ceramic, glass or analogous inorganic material
72 [SOURCE: EN 60137:2017, 3.12]73 3.4
74 fully insulated cable box
75 metallic weatherproof enclosure as in 3.1 where those parts of the termination and bushing within the
76 enclosure including live metal parts and cable cores are insulated by a liquid or compound suitable for the
77 appropriate system voltage78 Note 1 to entry: The box shall be suitably sealed to contain the liquid or compound and allow for their expansion due to
79 temperature changes.---------------------- Page: 6 ----------------------
oSIST prEN 50336:2021
prEN 50336:2020 (E)
80 3.5
81 shroud insulated cable box
82 metallic weatherproof enclosure as in 3.1 but within which the cable cores are terminated with local insulation
83 enhancement, e.g. phase barrier, bushing protection or taping84 4 Requirements
85 4.1 General Requirements
86 Bushings specified by this document shall be installed with the transformer side of the bushing fully immersed
87 in insulating liquid and the other end either;88 — fully immersed in an insulating liquid;
89 — or with shrouded insulation in air;
90 — or in air but not exposed to external atmospheric conditions.
91 All current-carrying parts shall be tin plated in accordance with customer requirements.
92 NOTE IEC Guide 109 and EN 62542 provide guidance which could be used to minimize the impact of bushings on
93 the environment during all phases of their life (including manufacturing, operation during service life, dismantling after their
94 end life and disposal or recycling).95 4.2 Ratings
96 4.2.1 Standard values of rated voltage for ceramic insulators (U )
97 The value of U of a bushing shall be chosen from the standard values of the highest voltage for transformers
98 and reactors U given below in kilovolts:99 12 - 24 - 36
100 — For values of Um less than 12kV bushings with Ur = 12kV shall be chosen
101 — For values of Um greater than 12kV and less than or equal to 24kV bushings with Ur = 24kV shall be
102 chosen.103 — For values of Um greater than 24kV and less than or equal to 36kV bushings with Ur = 36KV shall be
104 chosen.105 4.2.2 Standard values of rated voltage for resin insulated bushings (U )
106 The value of Um is 12kV in oil but the same item can be used at 1.1kV in air.
107 4.2.3 Standard values of rated cu...
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