EN 50299-2:2014

Oil-immersed cable connection assemblies for transformers and reactors having highest voltage for equipment Um from 72,5 kV to 550 kV - Part 2: Dry-type cable terminations

This European Standard covers the oil-immersed single-phase connection assemblies of cables for transformers and reactors designed in accordance with EN 60076 series. NOTE The term "transformer" is used as common definition for transformer and reactor. If no separate cable connection box is used and dry-type cable terminations are directly installed into the transformer tank the requirements of this standard should be followed. The purpose of EN 50299-2 is to establish for the cable connection assemblies: - electrical and mechanical requirements including interchangeability; - limits of supply; - tests to be carried out. It complements and amends, if necessary, the relevant standards and applies to dry-type cable terminations for power cables with extruded insulation which may be used with similar interfaces for the cable entrance in switchgear applications according to EN 62271-209. This standard applies to oil-filled cable connection boxes of transformers with highest voltage for equipment from Um = 72,5 kV to 550 kV, including the conductor current terminal with removable link between the transformer and the dry-type cable termination.

Ölgefüllte Kabelanschlusseinheiten für Transformatoren und Drosselspulen mit einer höchsten Spannung für Betriebsmittel Um von 72,5 kV bis 550 kV - Teil 2: Kompaktkabelanschlüsse

Boîte de raccordement de câble pour transformateurs immergés et bobine d'inductance de tensions comprises entre 72,5 kV et 550 kV - Partie 2: Extrémité de câble sèche

Povezovalni sestavi oljnih kablov za transformatorje in dušilke, pri katerih je najvišja napetost opreme Um od 72,5 kV do 550 kV - 2. del: Suhi kabelski priključki

Ta evropski standard obravnava povezovalne sestave oljnih enofaznih kablov za
transformatorje in dušilke, zasnovane v skladu s skupino standardov EN 60076.
OPOMBA Izraz »transformator« je uporabljen kot splošni izraz za transformator in dušilko.
Če se ne uporablja ločena priključna vtičnica in so suhi kabelski priključki nameščeni neposredno v transformatorski kotel, je treba uporabljati zahteve tega standarda.
Namen standarda EN 50299-2 je za povezovalne sestave kablov določiti:
• električne in mehanske zahteve, vključno z medsebojno zamenljivostjo;
• omejitve dobave;
• preskuse, ki jih je treba izvesti.
Standard po potrebi dopolnjuje in popravlja ustrezne standarde, uporablja pa se za suhe kabelske priključke za napajalne kable z ekstrudirano izolacijo, ki se lahko uporabljajo s podobnimi vmesniki za kabelske vhode pri stikalnih napravah v skladu s standardom EN 62271-209.
Ta standard se uporablja za oljne kabelske priključne vtičnice na transformatorjih, pri katerih je najvišja napetost opreme Um od 72,5 kV do 550 kV, vključno s priključkom električnega prevodnika z odstranljivo povezavo med transformatorjem in suhim kabelskim priključkom.

General Information

• Status: Published
• Publication Date: 13-Nov-2014
• Withdrawal Date: 12-Oct-2017
• ICS: 29.180 - Transformers. Reactors
• Technical Committee: CLC/TC 14 - Power transformers
• Drafting Committee: CLC/TC 14 - Power transformers
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 14-Nov-2014
• Due Date: 10-Aug-2015
• Completion Date: 14-Nov-2014
• Ref Project: SIST EN 50299-2:2015 - Oil-immersed cable connection assemblies for transformers and reactors having highest voltage for equipment Um from 72,5 kV to 550 kV - Part 2: Dry-type cable terminations

Relations

• Replaces: EN 50299:2002 - Oil-immersed cable connection assemblies for transformers and reactors having highest voltage for equipment Um from 72,5 kV to 550 kV
• Effective Date: 28-Jan-2023

Overview

EN 50299-2:2014 specifies requirements for oil-immersed cable connection assemblies for transformers and reactors (highest voltage for equipment Um from 72.5 kV to 550 kV) where dry-type cable terminations are used. It applies to single‑phase connections of power cables with extruded insulation when dry‑type terminations are installed directly into the transformer tank or into the transformer’s cable connection box. The standard establishes electrical and mechanical requirements, limits of supply and the tests to be carried out to ensure safe, interchangeable interfaces between transformer and cable terminations.

Key topics and requirements

• Scope and purpose: Applies to oil‑filled cable connection boxes for transformers and reactors designed per the EN 60076 series; intended for dry‑type cable terminations that do not require insulating fluid.
• Rated values & preferred ratings: Defines highest voltage for equipment (Um) standard values (72.5, 100, 123, 145, 170, 245, 300, 362, 420, 550 kV) and preferred rated currents (1 000 A, 1 600 A, 2 000 A, 2 500 A, 3 150 A) where sockets are selected ≥1.2 × transformer rated current.
• Limits of supply / interface definition: Clarifies which parts are supplied by the transformer manufacturer and which by the termination supplier (see Figure 1 in the standard). Defines the socket, plug‑in cable connector, conductor current terminal with removable link, dummy plug and sealing cap.
• Mechanical & thermal requirements: Vacuum-, leak- and oil‑tightness aligned with EN 60076; dry‑type terminations must withstand a transverse static force of 2 kN. Temperature rise interactions between transformer terminal, insulating liquid and cable insulation are addressed.
• Connection materials: Contact surfaces may be bare copper, silver‑coated or tin‑coated copper, or copper‑coated aluminium, per the standard’s interface rules.
• Isolation for commissioning: Requires means (removable link or separable plug) to isolate the transformer during cable installation and commissioning tests.
• Tests: Specifies type, routine and factory tests for sockets and complete assemblies (dielectric, mechanical, sealing and compatibility tests).

Applications and users

• Transformer and reactor manufacturers integrating direct cable terminations into tanks
• Dry‑type cable termination and socket suppliers
• Utilities, substations and power‑grid engineers specifying high‑voltage cable terminations
• Switchgear designers where similar interfaces are used (see EN 62271‑209)
• Test laboratories performing type and routine tests for transformer cable interfaces

Related standards

• EN 60076 series (Power transformers)
• EN 60076‑3 (Insulation levels, dielectric tests)
• EN 62271‑209 (cable interfaces in switchgear)
• IEC 60840, IEC 62067, HD 632 S2 (cable system test voltages)
• EN 60296 / EN 60422 (insulating liquids)

Keywords: EN 50299-2:2014, dry-type cable terminations, oil-immersed cable connection assemblies, transformers and reactors, Um 72.5 kV to 550 kV, cable connection box, sockets, interchangeability, tests.

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2015
1DGRPHãþD
SIST EN 50299:2004
3RYH]RYDOQLVHVWDYLROMQLKNDEORY]DWUDQVIRUPDWRUMHLQGXãLONHSULNDWHULKMH
QDMYLãMDQDSHWRVWRSUHPH8PRGN9GRN9GHO6XKLNDEHOVNLSULNOMXþNL
Oil-immersed cable connection assemblies for transformers and reactors having highest
voltage for equipment Um from 72,5 kV to 550 kV - Part 2: Dry-type cable terminations
Ölgefüllte Kabelanschlusseinheiten mit Kompaktkabelanschlüssen für Transformatoren
und Drosselspulen mit einer höchsten Spannung für Betriebsmittel Um von 72,5 kV bis
550 kV - Teil 2: Kompaktkabelan-schlüsse
Boîte de raccordement de câble pour transformateurs immergés et bobine d'inductance
de tensions comprises entre 72,5 kV et 550 kV - Partie 2: Extrémité de câble sèche
Ta slovenski standard je istoveten z: EN 50299-2:2014
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 50299-2
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 2: Dry-type cable terminations
Boîte de raccordement de câble pour transformateurs Ölgefüllte Kabelanschlusseinheiten mit
immergés et bobine d'inductance de tensions comprises Kompaktkabelanschlüssen für Transformatoren und
entre 72,5 kV et 550 kV - Partie 2: Extrémité de câble sèche Drosselspulen mit einer höchsten Spannung für
Betriebsmittel Um von 72,5 kV bis 550 kV - Teil 2:
Kompaktkabelanschlüsse
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 50299-2:2014 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 .6
6.1 Highest voltage for equipment (U ) .6
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 Isolation of transformer during cable installation tests .6
7.2 Connection interface .6
7.3 Mechanical requirements .6
7.4 Shielding electrode .7
7.5 Insulating liquids .7
7.6 Dimensions .7
7.7 Protection against corrosion .7
7.8 Measuring tap .7
7.9 Earthing .7
7.10 Sealing cap .7
7.11 Dummy plug.7
7.12 Material compatibility .8
8 Tests .8
8.1 General .8
8.2 Tests on sockets .8
8.3 Factory tests on the transformer.8
8.4 Tests after installation of the cable system .9
Annex A (informative) . 13
Dielectric tests on sockets . 13
A.1 General . 13
A.2 Type approval tests . 13
A.3 Routine tests . 13
Bibliography . 14
Figures
Figure 1 – Limits of supply between transformer and dry-type cable termination . 10
Figure 2 – Typical arrangement of cable connection assemblies . 11

- 3 - EN 50299-2:2014
Foreword
This document (EN 50299-2:2014) has been prepared by CLC/TC 14 "Power transformers".

The following dates are fixed:

(dop) 2015-10-13
• 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) 2017-10-13
standards conflicting with this
document have to be withdrawn
This document partially supersedes EN 50299:2002, together with EN 50299-1:2014.

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

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

_______________
1 Scope
This European Standard covers the oil-immersed single-phase connection assemblies of cables for
transformers and reactors designed in accordance with EN 60076 series.
NOTE The term "transformer" is used as common definition for transformer and reactor.
If no separate cable connection box is used and dry-type cable terminations are directly installed into the
transformer tank the requirements of this standard should be followed.
The purpose of EN 50299-2 is to establish for the cable connection assemblies:
• electrical and mechanical requirements including interchangeability;
• limits of supply;
• tests to be carried out.
It complements and amends, if necessary, the relevant standards and applies to dry-type cable terminations
for power cables with extruded insulation which may be used with similar interfaces for the cable entrance in
switchgear applications according to EN 62271-209.
This standard applies to oil-filled cable connection boxes of transformers with highest voltage for equipment
from U = 72,5 kV to 550 kV, including the conductor current terminal with removable link between the
m
transformer and the dry-type cable termination.
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 60076-3:2013 Power transformers —Part 3: Insulation levels, dielectric tests and external clearances in
air (IEC 60076-3:2013)
EN 60296 Fluids for electrotechnical applications — Unused mineral insulating oils for transformers
and switchgear (IEC 60296)
EN 60422 Mineral insulating oils in electrical equipment — Supervision and maintenance guidance
(IEC 60422)
EN 60529 Degrees of protection provided by enclosures (IP code) (IEC 60529)
EN 61099 Insulating liquids — Specifications for unused synthetic organic esters for electrical
purposes (IEC 61099)
EN ISO 1302 Geometrical product specifications (GPS) — Indication of surface texture in technical
product documentation (ISO 1302)
IEC 60076-7 Power transformers — Part 7: Loading guide for oil-immersed power transformers
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 50299-2:2014
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
cable connection assembly
combination of a dry-type cable termination and a cable connection box which mechanically and electrically
connects the cable to the transformer
3.1.1
dry-type cable termination
cable termination which comprises an elastomeric electrical stress control component in intimate contact with
a separating insulation barrier (insulator or socket) between the extruded cable insulation and the liquid
insulation of the transformer cable connection box. The cable termination does not require any insulating fluid
3.1.1.1
socket
part to be installed in the cable connection box to plug the cable connector. Insulating barrier (socket)
between cable connector and the insulating fluid of the cable connection box enabling the mechanical and
electrical connection to the transformer
3.1.1.2
plug-in cable connector
equipment fitted to the end of a cable to ensure in combination with the socket an electrical connection to the
transformer
3.1.1.3
dummy plug
insulating device for voltage proof sealing of the socket
3.1.1.4
sealing cap
for protection of the socket against environmental conditions
3.1.2
cable connection box
part of the transformer which houses the dry-type cable termination and the conductor current terminal with
removable link
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 between the transformer and the dry-type cable termination are defined in Figure 1. The
manufacturer of the dry-type cable termination supplies the parts inside of the dotted line. The manufacturer
of the transformer supplies the other components. Typically, the socket will be installed in the cable
connection box by the transformer manufacturer. For details refer to table of Figure 1.
5 Rated values
When dimensioning the cable connection assembly 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 durat
...