EN 50464-2-1:2007

SLOVENSKI STANDARD
01-september-2007
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Three-phase oil-immersed distribution transformers 50 Hz, from 50 kVA to 2 500 kVA
with highest voltage for equipment not exceeding 36 kV -- Part 2-1: Distribution
transformers with cable boxes on the high-voltage and/or low-voltage side - General
requirements
Ölgefüllte Drehstrom-Verteilungstransformatoren 50 Hz, 50 kVA bis 2 500 kVA, mit einer
höchsten Spannung für Betriebsmittel bis 36 kV -- Teil 2-1: Verteilungstransformatoren
mit Kabelanschlusskästen auf der Ober- und/oder Unterspannungsseite - Allgemeine
Anforderungen
Transformateurs triphasés de distribution immergés dans l'huile, 50 Hz, de 50 kVA a 2
500 kVA, de tension la plus élevée pour le matériel ne dépassant pas 36 kV -- Partie 2-1:
Transformateurs de distribution raccordés par boîtes a câble côté haute tension et/ou
côté basse tension - Prescriptions générales
Ta slovenski standard je istoveten z: EN 50464-2-1:2007
ICS:
29.180 Transformatorji. Dušilke Transformers. Reactors
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 50464-2-1
NORME EUROPÉENNE
April 2007
EUROPÄISCHE NORM
ICS 29.180 Supersedes HD 428.2.1 S1:1994

English version
Three-phase oil-immersed distribution transformers
50 Hz, from 50 kVA to 2 500 kVA with highest voltage
for equipment not exceeding 36 kV -
Part 2-1: Distribution transformers with cable boxes
on the high-voltage and/or low-voltage side -
General requirements
Transformateurs triphasés de distribution Ölgefüllte
immergés dans l'huile, Drehstrom-Verteilungstransformatoren
50 Hz, de 50 kVA à 2 500 kVA, 50 Hz, 50 kVA bis 2 500 kVA,
de tension la plus élevée mit einer höchsten Spannung
pour le matériel ne dépassant pas 36 kV - für Betriebsmittel bis 36 kV -
Partie 2-1: Transformateurs de distribution Teil 2-1: Verteilungstransformatoren
raccordés par boîtes à câble côté haute mit Kabelanschlusskästen auf der
tension et/ou côté basse tension - Ober- und/oder Unterspannungsseite -
Prescriptions générales Allgemeine Anforderungen

This European Standard was approved by CENELEC on 2006-12-01. 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, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the 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

© 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50464-2-1:2007 E
Foreword
The text of the Harmonization Document HD 428.2.1 S1:1994, prepared by the Technical Committee
CENELEC TC 14, Power transformers, was submitted to the formal vote for conversion into a European
Standard and was approved by CENELEC as EN 50464-2-1 on 2006-12-01.
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) 2007-12-01
The EN 50464 series consists of the following parts, under the general title “Three-phase oil-immersed
distribution transformers 50 Hz, from 50 kVA to 2 500 kVA with highest voltage for equipment not
exceeding 36 kV”:
Part 1 General requirements
Part 2-1 Distribution transformers with cable boxes on the high-voltage and/or low-voltage
side – General requirements
Part 2-2 Distribution transformers with cable boxes on the high-voltage and/or low-voltage
side – Cable boxes type 1 for use on distribution transformers meeting the
requirements of EN 50464-2-1
Part 2-3 Distribution transformers with cable boxes on the high-voltage and/or low-voltage
side – Cable boxes type 2 for use on distribution transformers meeting the
requirements of EN 50464-2-1
Part 3 Determination of the power rating of a transformer loaded with non-sinusoidal
currents
Part 4 Requirements and tests concerning pressurised corrugated tanks

- 3 - EN 50464-2-1:2007
Contents
Introduction.4
1 Scope.5
2 Definitions.5
3 Electrical characteristics .6

4 Design characteristics.6
4.1 Type of oil preservation and degree of sealing. 6
4.2 Terminal markings. 6
4.3 Provision for cable box Type 1 connections. 6
4.4 Provision for cable box Type 2. 6
5 Transformer requirements .6

5.1 Transformers with cable boxes, mounted on both sides. 6
5.2 Transformers with cable boxes, cover mounted. 7
5.3 Unit substation transformer, with cable boxes mounted on the same side. 7
5.4 Unit substation transformer with flange boxes, cover mounted. 7
6 Distance between bushings.8
7 Tests .8

Figures
Figure 1 – Transformer with cable boxes, Type 1 side mounted – Limiting dimensions .9
Figure 2 – Unit substation transformer, with cable boxes Type 1 side mounted –
Limiting dimensions . 10
Figure 3 – Transformers with cable boxes, Type 1 cover mounted . 11

Figure 4 – Cover mounted, air filled common HV/LV cable box Type 2 . 11
Figure 5 – Unit substation transformers, cover mounted. 12
Figure 6 – Typical flange for flange box. 12

Introduction
EN 50464-1, Subclause 4.3 states that a distribution transformer could have different termination
features.
The following constructional situations are possible.
i) Termination in open type (oil-air) bushings without protection. This is covered by EN 50464-1,
EN 50180, EN 50386 and EN 50387.
ii) Termination in plug-in type bushings of inside or outside cone type. This is covered by EN 50464-1
and EN 50180.
iii) Termination in air filled or compound filled cable boxes or protective enclosure using open type
and/or oil/compound oil-oil bushings, as defined in EN 50464-2-2.
iv) Flange boxes and similar solutions using open type bushings can also be used.

- 5 - EN 50464-2-1:2007
1 Scope
EN 50464-2-1 covers, in conjunction with EN 50464-1, distribution transformers under iii) and iv) above,
up to 36 kV (the data from 24 kV to 36 kV are under consideration). Further documents exist which may
be used by agreement between purchaser and manufacturer for cable boxes and enclosures. The
dimensional requirements for cable boxes and protective enclosures are not enclosed in this document.
2 Definitions
For the purposes of this document, distribution transformers shall be classified according to the
following definitions:
2.1
transformers with cable boxes, side mounted
transformer with electrical characteristics in the range defined in EN 50464-1, with facings on the
transformer tank side for provision of cable boxes Type 1. These facings shall be on opposite sides of
the transformer (as Figure 1)
2.2
transformers with cable boxes or similar, cover mounted
transformer with electrical characteristics in the range defined in EN 50464-1, with terminations
mounted on the tank cover. The terminations exit in such a way as to provide for cables on opposite
sides of the transformer. The type of termination can be ei
...