EN 50180-1:2015

Bushings above 1 kV up to 52 kV and from 250 A to 3,15 kA for liquid filled transformers - Part 1: General requirements for bushings

This European Standard is applicable to ceramic and resin insulated bushings having highest voltages above 1 kV up to 52 kV, rated currents from 250 A up to 3 150 A and frequencies from 15 Hz up to 60 Hz for insulating liquid filled transformers. This European Standard establishes essential dimensions, to ensure interchangeability of bushings and to ensure adequate mounting and interchangeability of mating plug-in separable connectors of equivalent ratings.

Durchführungen über 1 kV bis 52 kV und von 250 A bis 3,15 kA für flüssigkeitsgefüllte Transformatoren - Teil 1: Allgemeine Anforderungen für Durchführungen

Traversées de tensions supérieures à 1 kV jusqu'à 52 kV et de 250 A à 3,15 kA pour transformateurs immergés dans un liquide - Partie 1: Exigences générales relatives aux traversées

Skoznjiki za napetosti nad 1 kV do 52 kV in tokove od 250 A do 3,15 kA za transformatorje, polnjene s tekočinami - 1. del: Splošne zahteve za skoznjike

Ta evropski standard se uporablja za keramične in smolnate izolirane skoznjike za najvišje napetosti nad 1 kV do 52 kV, nazivne tokove od 250 A do 3 150 A in frekvence od 15 Hz do 60 Hz za izoliranje transformatorjev, polnjenih s tekočino.
Ta evropski standard določa bistvene mere za zagotavljanje zamenljivosti skoznjikov ter zagotavljanje primerne pritrditve in zamenljivosti ustreznih medsebojno vtičnih priključkov enakovrednih moči.

General Information

• Status: Published
• Publication Date: 08-Oct-2015
• Withdrawal Date: 09-Aug-2018
• ICS: 29.080.20 - Bushings
• Technical Committee: CLC/TC 36A - Insulated bushings
• Drafting Committee: IEC/SC 36A - IEC_SC_36A
• Current Stage: 9093 - Decision to confirm - Review Enquiry
• Start Date: 30-Apr-2025
• Completion Date: 08-Oct-2025
• Ref Project: SIST EN 50180-1:2016 - Bushings above 1 kV up to 52 kV and from 250 A to 3,15 kA for liquid filled transformers - Part 1: General requirements for bushings

Relations

• Replaces: EN 50180:2010 - Bushings above 1 kV up to 52 kV and from 250 A to 3,15 kA for liquid filled transformers – Part 1: General requirements for bushings
• Effective Date: 28-Jan-2023

Overview

EN 50180-1:2015 (CLC/CENELEC) specifies the general requirements for bushings used on insulating, liquid‑filled transformers. It applies to ceramic and resin insulated bushings with highest voltages above 1 kV up to 52 kV, rated currents from 250 A to 3 150 A, and operating frequencies 15 Hz to 60 Hz. The standard establishes essential and detailed dimensions to ensure mechanical and electrical interchangeability of bushings and compatible plug‑in separable connectors.

Key topics and technical requirements

• Scope and applicability: Covers both open type bushings (one end in insulating liquid, the other in air) and plug‑in type bushings (designed to accept separable connectors).
• Standard rating values: Defines standard highest voltages (12, 24, 36, 52 kV) and rated currents (250, 400, 630, 800, 1 250, 2 000, 3 150 A).
• Interchangeability / interface types: Specifies interface dimensions and designations (letters/numbers) to ensure mating connectors and bushings of equivalent ratings are interchangeable.
• Common and detail dimensions: Includes essential common dimensions, plus detailed drawings and creepage distance requirements for open and plug‑in bushings (figures and tables provide the dimensional data).
• Compliance and referenced tests: Requires compliance with EN 60137 (insulated bushing tests and requirements) and references materials and insulator standards such as EN 60672‑3, EN 62155 and IEC/TS 60815.
• Documentation structure: Part 1 covers general requirements; EN 50180 series also includes Part 2 (bushing components) and Part 3 (bushing fixations).

Practical applications and users

Who uses EN 50180-1:2015:

• Transformer manufacturers specifying bushing interfaces and ensuring connector compatibility.
• Bushing and separable connector OEMs designing to standard interface types.
• Utilities and substation engineers selecting and replacing transformer bushings to guarantee interchangeability.
• Procurement teams and compliance officers verifying vendor conformity.
• Test labs and certification bodies applying referenced test standards (EN 60137).

Benefits in practice:

• Facilitates safe, reliable replacement and retrofitting of bushings without custom adaptors.
• Ensures mechanical mounting and electrical performance consistency across suppliers.
• Simplifies equipment interoperability for operations, maintenance and spares management.

Related standards

• EN 60137 - Insulated bushings for alternating voltages above 1 000 V (test and performance requirements)
• EN 60672‑3 - Ceramic and glass insulating materials
• EN 62155 - Hollow pressurized and unpressurized ceramic and glass insulators
• IEC/TS 60815 - Selection and dimensioning in polluted conditions

Keywords: EN 50180-1:2015, bushings, liquid filled transformers, plug‑in bushings, open type bushings, interchangeability, interface dimensions, separable connector, transformer bushing standard.

Standards Content (Sample)

SLOVENSKI STANDARD
01-januar-2016
1DGRPHãþD
SIST EN 50180:2010
6NR]QMLNL]DQDSHWRVWLQDGN9GRN9LQWRNRYHRG$GRN$]D
WUDQVIRUPDWRUMHSROQMHQHVWHNRþLQDPLGHO6SORãQH]DKWHYH]DVNR]QMLNH
Bushings above 1 kV up to 52 kV and from 250 A to 3,15 kA for liquid filled transformers
- Part 1: General requirements for bushings
Durchführungen über 1 kV bis 52 kV und von 250 A bis 3,15 kA für flüssigkeitsgefüllte
Transformatoren - Teil 1: Allgemeine Anforderungen für Durchführungen
Traversées de tensions supérieures à 1 kV jusqu'à 52 kV et de 250 A à 3,15 kA pour
transformateurs immergés dans un liquide - Partie 1: Exigences générales relatives aux
traversées
Ta slovenski standard je istoveten z: EN 50180-1:2015
ICS:
29.080.20 Skoznjiki Bushings
29.180 Transformatorji. Dušilke Transformers. Reactors
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 50180-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2015
ICS 29.080.20 Supersedes EN 50180:2010
English Version
Bushings above 1 kV up to 52 kV and from 250 A to 3,15 kA for
liquid filled transformers - Part 1: General requirements for
bushings
Traversées de tensions supérieures à 1 kV jusqu'à 52 kV et Durchführungen über 1 kV bis 52 kV und von 250 A bis
de 250 A à 3,15 kA pour transformateurs immergés dans un 3,15 kA für flüssigkeitsgefüllte Transformatoren - Teil 1:
liquide - Partie 1: Exigences générales relatives aux Allgemeine Anforderungen für Durchführungen
traversées
This European Standard was approved by CENELEC on 2015-08-10. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 50180-1:2015 E
Contents
European foreword . 4
Introduction . 5
1 Scope. 6
2 Normative references . 6
3 Terms and definitions . 6
4 Requirements . 7
4.1 Application . 7
4.2 Standard values of maximum voltage (U ) . 7
m
4.3 Standard values of rated current (I ) . 7
r
4.4 Compliance . 7
4.5 Common dimensions . 7
4.6 Detail dimensions and creepage distances of open type bushings . 9
4.7 Detail dimensions of plug-in type bushings .21
Annex A (normative) Detail drawings of porcelain .27
Bibliography .38
Figures
Figure 1 —Common dimensions for open and plug-in type bushings . 8
Figure 2 — 250 A types 12 to 36 kV . 9
Figure 3 — 630 A types 12 to 36 kV .11
Figure 4 — 1 250 A types 12 to 36 kV .13
Figure 5 — 2 000 A – 3 150 A types 12 to 36 kV .15
Figure 6 — 250 A – 630 A types 52 kV .17
Figure 7 — 1 250 A – 2 000 A – 3 150 A types 52 kV .19
Figure 8 — Outside cone plug-in type bushings .21
Figure 9 - Details of outside cone plug-in type bushings .23
Figure 10 — Inside cone plug-in type bushings .25
Figure 11 — Details of inside cone plug-in type bushings .26
Figure A.1 — Insulator (item N°.1), type 1 .27
Figure A.3 — Insulator (Item n°1), type 3 .27
Figure A.2 — Insulator (Item n°1), type 2 .27
Figure A.4 — Insulator (Item n°1), type 4 .28
Figure A.5 — Insulator (Item n°1), type 5 .28
Figure A.6 — Insulator (Item n°1), type 6 .29
Figure A.7 — Insulator (Item n°1), type 7 .29
Figure A.8 — Insulator (Item n°1), type 8 .30
Figure A.9 — Insulator (Item n°1), type 9 .30
Figure A.10 — Insulator (Item n°1), type 21 .31
Figure A.11 — Insulator (Item n°1), type 22 .31
Figure A.12 — Insulator (Item n°1), type 23 & 23M.32
Figure A.13 — Insulator (Item n°1), type 24 & 24M.32
Figure A.14 — Insulator (Item n°1), type 25 .33
Figure A.15 — Insulator (Item n°1), type 26 .33
Figure A.16 — Insulator (Item n°1), type 27&27M.34
Figure A.17 — Insulator (Item n°1), type 28 & 28M.34
Figure A.18 — Insulator (Item n°1), type 29 .35
Figure A.19 — Insulator (Item n°1), type 30 .36
Figure A.20 — Insulator (Item n°1), type 31 .36
Figure A.21 — Adjusting ring .38

Tables
Table 1 — Common dimensions for open and plug-in type bushings . 8
Table 2 — Dimensions, 250 A types 12 to 36 kV .10
Table 3 — List of components, 250 A types 12 to 36 kV .10
Table 4 — Dimensions, 630 A types 12 to 36 kV .11
Table 5 — List of components - 630 A types 12 to 36 kV .12
Table 6 — Dimensions, 1 250 A types 12 to 36 kV .14
Table 7 — List of components, 1 250 A types 12 to 36 kV .14
Table 8 — Dimensions, 2 000 A – 3 150 A types 12 to 36 kV .16
Table 9 — List of components 2 000 A – 3 150 A types 12 to 36 kV .16
Table 10 — Dimensions, 250 A - 630 A types 52 kV .18
Table 11 — List of components 250 A - 630 A types 52 kV .18
Table 12 — Dimensions, 1 250 A – 2 000 A – 3 150 A types 52 kV .20
Table 13 — List of components 1 250 A – 2000 A – 3 150 A types 52 kV.20
Table 14 — Interface dimensions .22
Table 15 — Bushing dimensions .24
Table 16 — Interface dimensions .25
Table 17 — Interface dimensions .26

European foreword
This document (EN 50180-1:2015) has been prepared by CLC/ TC 36A "Insulated bushings".

The following dates are fixed:

(dop) 2016-08-10
• latest date by which this document has
to be implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2018-08-10
standards conflicting with this
document have to be withdrawn
This document supersedes EN 50180:2010.

The only editorial modifications that have been done in EN 50180-1:2015 compared to EN 50180:2010 are the
following:
1) EN 50180:2010 has been turned into EN 50180-1:2015 to allow the addition of two new parts;

2) an editorial correction of view "Y" on page 34 related to Figures A.16 and A.17 has been made.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights.
CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent rights.

EN 50180 "Bushings above 1 kV up to 52 kV and from 250 A to 3,15 kA for liquid filled transformers" consists of
the following parts:
– Part 1: General requirements for bushings;

– Part 2: Requirement for bushing components;

– Part 3: Requirements for bushing fixations.

__________
Introduction
The object of this European Standard is to specify the requirements to ensure interchangeability of bushings having
highest voltages above 1 kV up to 52 kV and rated currents from 250 A up to 3 150 A for insulating liquid filled
transformers.
1 Scope
This European Standard is applicable to ceramic and resin insulated bushings having highest voltages above 1 kV
up to 52 kV, rated currents from 250 A up to 3 150 A and frequencies from 15 Hz up to 60 Hz for insulating liquid
filled transformers.
This European Standard establishes essential dimensions, to ensure interchangeability of bushings and to ensure
adequate mounting and interchangeability of mating plug-in separable connectors of equivalent ratings.

2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable
for its application. For dated references, only the edition cited applies. For undated references, the latest edition of
the referenced document (including any amendments) applies.

EN 60137, Insulated bushings for alternating voltages above 1 000 V (IEC 60137)

EN 60672-3, Ceramic and glass-insulating materials — Part 3: Specifications for individual materials (IEC 60672-3)

EN 62155, Hollow pressurized and unpressurized ceramic and glass insulators for use in electrical equipment with
rated voltages greater than 1 000 V (IEC 62155)

IEC/TS 60815 (all parts), Selection and dimensioning of high-voltage insulators intended for use in polluted
conditions
NOTE It is highly advised to minimize the impact of bushings on the environment during all phases of their life (including
manufacturing, operation during service life, dismantling after their end of life and disposal or recycling).

IEC Guide 109 and EN 62542 can be used as helpful reference.

3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

3.1
open type bushing
bushing, one end of which is immersed in an insulating liquid with the other end in ambient air and exposed or not
exposed to external atmospheric conditions

3.2
plug-in type bushing
bushing, one end of which is immersed in an insulating medium and the other end designed to receive a separable
insulated cable connector without which the bushing cannot function

3.3
separable connector
fully insulated termination permitting the connection and disconnection of the cable to and from the mating plug-in
type bushing
3.4
interface type
bushing dimensions that insure mechanical and electrical interchangeability of bushing and separable connector of
similar rating and type. Each interface type is designated by a letter or a number

3.5
bail holder
fixture which facilitates anchoring of an externally mounted device (called the bail) designed to prevent undesirable
separation of a separable connector and a bushing. A bail holder may or may not be an integral part of a bushing
and is an optional feature
4 Requirements
4.1 Application
Open type bushings covered by this standard shall be suitable for operation with one end fully immersed in an
insulating liquid and with the other in air.

Plug-in type bushings covered by this standard shall be suitable for operation with one end partially or fully
immersed in an insulating medium and with the other in a separable connector.
4.2 Standard values of maximum voltage (U )
m
The value of U of a bushing shall be chosen from the standard values of the highest voltage for equipment U as
m m
given below, in kilovolts:
12 - 24 - 36 - 52
4.3 Standard values of rated current (I )
r
The value of I of a bushing shall be chosen from the standard values given below, in amperes:
r
250 - 400 - 630 - 800 -1250 - 2000 - 3150
4.4 Compliance
Bushings shall meet the requirements of EN 60137.
4.5 Common dimensions
The dimensions necessary for interchangeability between open and plug-in type bushings shall be as specified in
Figure 1 and Table 1.
NOTE For open type bushings the internal connection may be a flexible conductor or a stem.

Figure 1 —Common dimensions for open and plug-in type bushings

Table 1 — Common dimensions for open and plug-in type bushings
+2
I U d d
r m 1  d 0 3 / / /
2   1 2 3
max. max.
A kV mm mm mm mm mm mm
0 0 0 0
250 12 ÷ 36   77 80 111 145 25 45
-5  -7  -2
0     0 0
400 ÷ 630 12 ÷ 36 87 90 128 195 25 75
-6     -8  -2
0     0 0
800 ÷ 1 250 12 ÷ 36 107 110 165 215 30 100
-7 -10  -2
0     0 0
2 000 ÷ 3 150 12 ÷ 36 132 135 185 215 30 100
-8     -11  -2
0     0  +2
250 ÷ 3 150 52 132 135 185 320 35 100
-8     -11  -2
4.6 Detail dimensions and creepage distances of open type bushings
4.6.1 General recommendations
The dimensions necessary for interchangeability of open type bushings shall be as specified in the following figures
(Figure 2 up to Figure 7) and tables (Table 2 up to Table 13).

These figures do not purport to show constructional details. The provision for arcing horns should be made if
required.
Customized bushings are subject to an agreement between purchaser and manufacturer.

As a special requirement, bushings of 36 kV can be ordered with metallization or equivalent of the flange collar with
extension “M” in the designation. The creepage distance, as indicated in the different tables of this standard, will be
reduced of approximately 100 mm.

NOTE 52 kV bushings are always with metallization or equivalent solution.
4.6.2 250 A types 12 to 36 kV
Insulator types for 250 A may be clamped to the transformer tank using either the fixation method illustrated or a
separate insulation piece on the inside of the tank.

This drawing does not purport to show constructional details.
All dimensions in mm
Key
← - - → arcing distance AC
∙ -------- ∙ creepage distance AB

Figure 2 — 250 A types 12 to 36 kV
Table 2 — Dimensions, 250 A types 12 to 36 kV
Arcing
Min. nominal creepage Insulator / / d d
4 5 4 5
U Distance
m
Distance AB (mm) type max. max. max. max.
AC
Designation
Pollution level
kV (IEC/TS 60815) mm mm mm mm mm
b    c    d    e
12-250/P1 192
12 1 145 190 270 75 140
12-250/P2 240
12-250/P4 12  300 372
2 260 304 384 80 150
24-250/P2 24 384 480
24-250/P3 24  600
3 315 357 437 80 155
36-250/P1 36 576
24-250/P4 24  744
4 465 516 596 80 155
36-250/P3 36 720 900
36-250/P4 36  1 116 5 485 516 596 80 190

Table 3 — List of components, 250 A types 12 to 36 kV
Item Quantity Designation Remarks

1 1    Type 1
1 1   Type 2
1   1 1  Insulator Type 3 Porcelain
1 1 Type 4
1 Type 5
a
2 1 Terminal stud Brass
a
3 1 Cap Brass
Insulating liquid resistant
a
4 1 Gasket
material
a
5 1 Spacer
Insulating liquid resistant
a
6 1 Packing
material
7 3 Nut Brass
8 2 Washer Brass
9 As required Nut Corrosion-resistant
10 As required Washer Corrosion-resistant
11 1 Spring-washer Corrosion-resistant
Variant A: by means of clamping pieces
a
12 As required Clamping piece Corrosion-resistant
Variant B: by means of clamping ring
a
13 1 Clamping ring Corrosion-resistant
a
14 As required Clamping paw Corrosion-resistant
a
Constructional details are not covered by this standard.

12-250/P1
12-250/P2
12-250/P4
24-250/P2
24-250/P3
24-250/P4
36-250/P1
36-250/P3
36-250/P4
4.6.3 630 A types 12 to 36 kV
This drawing does not purport to show constructional details.

All dimensions in mm
Key
← - - → arcing distance AC
∙ -------- ∙ creepage distance AB
Figure 3 — 630 A types 12 to 36 kV
Table 4 — Dimensions, 630 A types 12 to 36 kV
Min. nominal creepage
U Arcing  d d
m /4 /5 /6 4  5
distance AB (mm)
Inulator distance max. max. max. max. max.
Designation Pollution level
Type AC
kV (IEC/TS 60815)
mm mm mm mm mm mm
b     c     d     e
12-630/P3 12 192 240 300 6 190 235 350 90 80 155
12-630/P4 12  372
7 285 325 440 90 85 170
24-630/P2 24 384 480
24-630/P4 24  600 744
8 375 423 540 100 85 180
36-630/P2 36 576 720
36-630/P4 36  900 1116 9 475 515 630 100 85 210

Table 5 — List of components - 630 A types 12 to 36 kV
Item Quantity Designation Remarks

1   Type 6
1 1  Type 7
Insulator Porcelain
1  1 1 Type 8
1 Type 9
a
2 1 Terminal stud Brass
a
3 1 Cap Brass
Insulating liquid
a
4 1 Gasket
resistant material
a
5 1 Spacer
Insulating liquid
a
6 1 Packing
resistant material
7 3 Nut Brass
8 2 Washer Brass
9 As required Nut Corrosion-resistant
10 As required Washer Corrosion-resistant
11 1 Spring-washer Corrosion-resistant
a
15 1 Gasket
a
16 1 Vent plug Brass
Variant A: by means of clamping pieces
a
12 As required Clamping piece Corrosion-resistant
Variant B: by means of clamping ring
a
13 1 Clamping ring Corrosion-resistant
a
14 As required Clamping paw Corrosion-resistant
a
Constructional details are not covered by this standard.

12-630/P3
12-630/P4
24-630/P2
24-630/P4
...