EN 50299-1:2014

SLOVENSKI STANDARD
01-maj-2015
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Oil-immersed cable connection assemblies for transformers and reactors having highest
voltage for equipment Um from 72,5 kV to 550 kV - Part 1: Fluid-filled cable terminations
Ölgefüllte Kabelanschlusseinheiten für Transformatoren und Drosselspulen mit einer
höchsten Spannung für Betriebsmittel Um von 72,5 kV bis 550 kV - Teil 1:
Flüssigkeitsgefüllte Kabelendverschlüsse
Boîte de raccordement de câble pour transformateurs immergés et bobine d'inductance
de tensions comprises entre 72,5 kV et 550 kV -- Partie 1: Extrémité de câble remplie
d’un fluide
Ta slovenski standard je istoveten z: EN 50299-1:2014
ICS:
29.060.20 Kabli Cables
29.180 Transformatorji. Dušilke Transformers. Reactors
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 50299-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2014
ICS 29.180 Supersedes EN 50299:2002 (PART)
English Version
Oil-immersed cable connection assemblies for transformers and
reactors having highest voltage for equipment Um from 72,5 kV
to 550 kV - Part 1: Fluid-filled cable terminations
Boîte de raccordement de câble pour transformateurs Ölgefüllte Kabelanschlusseinheiten für Transformatoren
immergés et bobine d'inductance de tensions comprises und Drosselspulen mit einer höchsten Spannung für
entre 72,5 kV et 550 kV - Partie 1: Extrémité de câble Betriebsmittel Um von 72,5 kV bis 550 kV - Teil 1:
remplie d'un fluide Flüssigkeitsgefüllte Kabelendverschlüsse
This European Standard was approved by CENELEC on 2014-10-13. 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
© 2014 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 50299-1:2014 E
Contents
Foreword .3
1 Scope .4
2 Normative references .4
3 Terms and definitions .5
4 Limits of supply .5
5 Rated values .5
6 Preferred values .5
6.1 Highest voltage for equipment (U ) .5
m
6.2 Rated currents (I ) .6
r
6.3 Transformer test voltages .6
6.4 Transformer test currents .6
6.5 Cable installation test voltage .6
7 Requirements .6
7.1 Connection interface .6
7.2 Mechanical requirements .6
7.3 Dimensions .6
7.4 Protection against corrosion .7
7.5 Mechanical forces on cable terminations .7
8 Tests .7
8.1 Factory tests .7
8.2 Tests after installation .7
Bibliography . 11
Figures
Figure 1 – Limits of supply between transformer and cable termination .8
Figure 2 – Typical arrangement of cable connection assemblies .9

– 3 – EN 50299-1:2014
Foreword
This document (EN 50299-1:2014) has been prepared by CLC/TC 14 "Power transformers".

The following dates are fixed:

• latest date by which this document has (dop) 2015-10-13
to be implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2017-10-13
• latest date by which the national
standards conflicting with this
document have to be withdrawn
This document partially supersedes EN 50299:2002, together with EN 50299-2:2014. Changes have been
made in this document to bring it line with EN 50299-2:2014.

Dimensions mentioned in EN 50299-1 are valid for fluid-filled cable terminations. Dry-type cable terminations
may also fit to these requirements.

A new standard EN 50299-2 is issued which describes requirements for dry-type cable terminations only.

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.

_______________
1 Scope
This European Standard covers the oil-immersed single-phase connection assembly of cables for
transformers and reactors, designed in accordance with EN 60076 series.
NOTE In the standard the term "transformer" is used as common definition for transformer and reactor.
The purpose of EN 50299-1 is to establish for the cable assemblies:
• the electrical and mechanical requirements, including interchangeability;
• the limits of supply;
• the test to be carried out.
It complements and amends, if necessary, the relevant IEC standards and applies to oil immersed cable
connections, suitable for fluid-filled or dry-type cable terminations.
EN 50299-1 does not cover direct cable terminations (see 3.1.1.3), but, in this case, upon agreement
between purchaser and supplier, the standard may be used for guidance except for Figure 1 and Figure 2
which are not applicable.
This standard applies to oil-immersed cable connection boxes on transformers with highest voltage for
equipment U = 72,5 kV to 550 kV, including the current conductor terminal at the cable sealing end of the
m
transformer.
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 60076 Series Power transformers (IEC 60076 Series)
EN 60296 Fluids for electrotechnical applications — Unused mineral insulating oils for transformers
and switchgear (IEC 60296)
EN ISO 1302 Geometrical product specifications (GPS) — Indication of surface texture in technical
product documentation (ISO 1302)
IEC 60141 Series Tests on oil-filled and gas-pressure cables and their accessories
IEC 60840 Power cables with extruded insulation and their accessories for rated voltages above
30 kV (U = 36 kV) up to 150 kV (U = 170 kV) — Test methods and requirements
m m
IEC 62067 Power cables with extruded insulation and their accessories for rated voltages above
150 kV (U = 170 kV) up to 500 kV (U = 550 kV) — Test methods and requirements
m m
HD 632 S2 Power cables with extruded insulation and their accessories for rated voltages above
36 kV (U = 42 kV) up to 150 kV (U = 170 kV)
m m
– 5 – EN 50299-1:2014
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
cable connection assembly
combination of a cable termination and a cable connection box which mechanically and electrically connects
the cable to the transformer
3.1.1
cable termination
equipment fitted to the end of a cable to ensure electrical connection with other parts of the system and to
maintain the insulation up to the point of connection
3.1.1.1
fluid-filled cable termination
cable termination which includes an insulating fluid as part of the cable connection assembly and comprises a
separation between said cable fluid in the cable connection box
3.1.1.2
dry-type cable termination
cable termination which comprises an elastomeric electrical stress control component in intimate contact with
a separating insulating barrier (insulator) between the cable insulation and the liquid insulation of the
transformer cable connection box. The cable termination does not require any insulating fluid
3.1.1.3
direct cable termination
cable termination directly fitted on the end of the cable without any separating insulating barrier between the
cable insulation and the insulation of the cable connection box. The cable enters directly into the cable box
via a gland
3.1.2
cable connection box
part of the transformer which houses the cable termination and the interface to the transformer connection
3.1.2.1
conductor current terminal with removable link
interface to the transformer with removable connection between transformer and socket which allows the
transformer to be electrically separated from the cable
4 Limits of supply
The limits of supply of transformer and cable termination shall be according to Figure 1.
5 Rated values
The following rated values shall apply:
a) highest voltage for equipment (U );
m
);
b) rated currents (I
r
c) rated short-time and peak withstand currents;
d) rated duration of short-circuit;
e) test voltages and test currents for testing the transformer;
f) test voltage for cable commissioning.
6 Preferred values
6.1 Highest voltage for equipment (U )
m
The highest voltage for equipment U of the cable connection shall be equal to the values for the cable and
m
the transformer and shall be selected from the following standard values:
72,5 kV – 100 kV – 123 kV – 145 kV – 170 kV – 245 kV – 300 kV – 362 kV – 420 kV – 550 kV.

6.2 Rated currents (I )
r
Sockets shall be selected with a rated current I higher than 1,2 times of the rated current of the transformer.
r
They are qualified without performing additional tests or qualifications, to ensure withstand capability of
overloading conditions of transformer according to IEC 60076-7.
The rated current I shall be selected from the following standard values which are 20 % higher than the rated
r
current of the transformer:
1 000 A – 1 600 A – 2 000 A – 2 500 A – 3 150 A.
Short-time and peak withstand currents as well as the duration of short circuit shall refer to the levels
provided by the cable system, not exceeding the values given in IEC 60076-7 loading guide.
6.3 Transformer test voltages
Transformer test voltages shall conform to EN 60076-3.
6.4 Transformer test currents
Transformer test currents shall conform to IEC 60076-7.
6.5 Cable installation test voltage
The cable installation test voltage shall conform to HD 632 S2, IEC 60840 or IEC 62067.
7 Requirements
7.1 Connection interface
The current-carrying contact surfaces of the connection interface shall be either bare copper or copper silver-
coated or tin-coated or silver-coated aluminium. The temperature of this interface shall not exceed the limit
given in the standard for the cable for which the cable connection box is designed.
T
...