SIST EN 50387:2004

Busbar bushings up to 1 kV and from 1,25 kA to 5 kA, for liquid filled transformers

This standard is applicable to moulded indoor busbar bushings for rated voltages up to 1 000 V, rated currents from 1 250 A up to 5 000 A and frequencies from 15 Hz up to 60 Hz for insulating liquid filled transformers.
NOTE These bushings are suitable for operation at 1,1 kV in compliance with HD 428.1 S1.

Schienendurchführungen bis 1 kV und von 1,25 kA bis 5 kA für flüssigkeitsgefüllte Transformatoren

Traversées passe-barres jusqu'à 1 kV et de 1,25 kA à 5 kA, pour transformateurs à remplissage de liquide

Zbiralčni skoznjiki za napetosti do 1 kV in od 1,25 kA do 5 kA za transformatorje, polnjene s tekočinami

General Information

• Status: Published
• Publication Date: 31-Aug-2004
• ICS: 29.080.20 - Bushings
• ICS: 29.180 - Transformers. Reactors
• Technical Committee: IZL - Insulators
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Sep-2004
• Due Date: 01-Sep-2004
• Completion Date: 01-Sep-2004
• Ref Project: EN 50387:2002 - Busbar bushings up to 1 kV and from 1,25 kA to 5 kA, for liquid filled transformers

Relations

• Replaces: SIST HD 607 S1:1997 - Busbar bushings up to 1 kV and from 1,25 kA to 5 kA, for liquid filled transformers
• Effective Date: 13-May-2010

Overview

SIST EN 50387:2004 is the CENELEC standard that specifies requirements for moulded indoor busbar bushings used with insulating liquid-filled transformers. It defines dimensions, ratings and performance criteria to ensure interchangeability and safe operation for bushings rated up to 1 000 V and rated currents from 1 250 A to 5 000 A. The standard applies for frequencies from 15 Hz to 60 Hz and notes suitability for operation at 1.1 kV in compliance with HD 428.1 S1.

Key Topics

• Scope and application: Moulded indoor busbar bushings for liquid-filled transformers; includes conditions where ends are immersed in insulating liquid, partly immersed, or both ends in air for special applications.
• Rated voltage and current:
  • Rated voltage (U_r): 1 000 V (phase to phase)
  • Standard rated currents (I_r): 1 250, 1 600, 2 000, 2 500, 3 150, 4 000, 5 000 A
• Creepage distance: Minimum nominal creepage distance for bushing ends intended for use in air is 55 mm.
• Dielectric characteristics:
  • Power-frequency withstand voltage (60 s) - dry: 10 kV
  • Lightning impulse (1.2/50 μs): 20 kV
• Mechanical and dimensional requirements: Dimensions are specified in the standard (Figure 1 and Table 1) to ensure interchangeability. The busbar material is copper unless otherwise agreed, in which case the rated current value shall be amended.

Applications

SIST EN 50387:2004 is primarily used by transformer manufacturers, specifiers and maintenance teams for:

• Ensuring consistent cut-outs in transformer covers or tank walls for busbar passage.
• Specifying interchangeable bushing components during design, procurement and retrofit of liquid-filled transformers.
• Verifying dielectric and creepage performance for indoor installations and special indoor-air applications.
• Aligning busbar material decisions (copper by default) with current-carrying requirements.

Practical benefits include reduced design variability, simplified spare parts management and clearer procurement specifications for high-current busbar connections in indoor, liquid-filled transformer applications.

Related Standards

• HD 607 S1 (superseded document referenced in the foreword) - harmonization document converted to EN 50387.
• HD 428.1 S1 - referenced for operation at 1.1 kV.

For specification, compliance and installation, consult the full SIST EN 50387:2004 text for figure and table details (standard dimensions, tolerances and mounting arrangements). This summary highlights practical requirements and applications without replacing the normative standard.

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2004
1DGRPHãþD
SIST HD 607 S1:1997
=ELUDOþQLVNR]QMLNL]DQDSHWRVWLGRN9LQRGN$GRN$]DWUDQVIRUPDWRUMH
SROQMHQHVWHNRþLQDPL
Busbar bushings up to 1 kV and from 1,25 kA to 5 kA, for liquid filled transformers
Schienendurchführungen bis 1 kV und von 1,25 kA bis 5 kA für flüssigkeitsgefüllte
Transformatoren
Traversées passe-barres jusqu'à 1 kV et de 1,25 kA à 5 kA, pour transformateurs à
remplissage de liquide
Ta slovenski standard je istoveten z: EN 50387:2002
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 50387
NORME EUROPÉENNE
EUROPÄISCHE NORM November 2002

ICS 29.180 Supersedes HD 607 S1:1996

English version
Busbar bushings up to 1 kV and from 1,25 kA to 5 kA,
for liquid filled transformers

Traversées passe-barres  Schienendurchführungen
jusqu'à 1 kV et de 1,25 kA à 5 kA, bis 1 kV und von 1,25 kA bis 5 kA
pour transformateurs für flüssigkeitsgefüllte Transformatoren
à remplissage de liquide
This European Standard was approved by CENELEC on 2002-10-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic,
Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta,
Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2002 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 50387:2002 E
Foreword
The text of the Harmonization Document HD 607 S1, prepared by the Technical Committee CENELEC
TC 36A, Insulated bushings, was approved by CENELEC on 1995-11-28.
This Harmonization Document was submitted to the formal vote for conversion into a European Standard
and was approved by CENELEC as EN 50387 on 2002-10-01.
The following date was fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2003-10-01
_________
- 3 - EN 50387:2002
Contents
Page
Introduction .4
1 Scope.4
2 Definitions.4
3 Requirements.4
3.1 Application.
...