SIST-TS CLC/TS 50537-1:2010

• Abstract:

  This Technical Specification is applicable to high voltage (HV) bushings, intended for use in traction transformers of rail vehicles, cooled by insulating liquid with rated voltages up to 25 kV single phase and rated currents up to 630 A at frequencies from 16,7 Hz to 60 Hz. ; HV bushings within the scope of this Technical Specification are bushings for separable connectors that connect the power supply coming from a contact wire or from a contact rail to the primary winding of the traction transformer. The Technical Specification only deals with HV bushings that are mounted to the transformer.; CLC/TS 50537-1 gives consideration to both technical and normative requirements of the railway environment and restricts the variety provided by industry-wide standards for bushings, such as EN 50180 and EN 60137. It determines requirements and tests enabling the interchangeability especially regarding electrical and mechanical interfaces. Furthermore, service conditions are described.; The cable plug as the counterpart of the HV bushing’s plug-in end is not covered by this Technical Specification.

• Status: Published
• Publication Date: 03-Mar-2010
• ICS: 29.180 - Transformers. Reactors
• ICS: 45.060.01 - Railway rolling stock in general
• Technical Committee: ŽEN - Electrical applications for railways
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 24-Feb-2010
• Due Date: 01-May-2010
• Completion Date: 04-Mar-2010
• Ref Project: CLC/TS 50537-1:2010 - Railway applications - Mounted parts of the traction transformer and cooling system - Part 1: HV bushing for traction transformers

SIST-TS CLC/TS 50537-1:2010 is the Slovenian adoption of CLC/TS 50537-1:2010, a CENELEC Technical Specification for railway applications. It specifies requirements and tests for high voltage (HV) bushings mounted on traction transformers in rail vehicles, so manufacturers, buyers and test labs can define the electrical and mechanical interface clearly. The document focuses on interchangeability, service conditions and verification of the bushing itself, not on the cable plug counterpart.

What does SIST-TS CLC/TS 50537-1:2010 specify?

SIST-TS CLC/TS 50537-1:2010 applies to HV bushings used on traction transformers of rail vehicles cooled by insulating liquid. It covers bushings for separable connectors that bring power from a contact wire or contact rail to the primary winding of the traction transformer, with the bushing mounted to the transformer.

The Technical Specification sets the framework for railway service conditions, interface dimensions, electrical withstand, mechanical strength, marking and testing. It also shows how this part fits into the CLC/TS 50537 series.

Annex	What it covers
Annex A	Informative examples for the mechanical flange, flange ring and pressure part

The document is organised into clauses on scope, normative references, terms and abbreviations, operating conditions, electrical requirements, mechanical requirements, fire protection, reliability and lifetime, markings and testing, followed by Annex A and a bibliography.

What are the key requirements of SIST-TS CLC/TS 50537-1:2010?

Operating conditions

SIST-TS CLC/TS 50537-1:2010 requires the HV bushing to work under normal railway service conditions, including contamination, vibration and other stresses typical of rolling stock. In practice, this means the design has to tolerate the environment in which the transformer is installed, not just laboratory conditions.

Clause 4 gives the environmental ranges for the plug-in end, including temperature, altitude, humidity and the relevant environmental severity classes. It also covers storage, transport and cleaning, so suppliers need to consider packaging, cleaning agents and how the product will be handled before installation.

The immersed end must work with the transformer cooling liquid. Clause 4.3 expects compatibility with mineral oil, ester and silicon liquids, and it requires the bushing to withstand the temperature gradient between the immersed end and the plug-in end.

Electrical requirements

Clause 5 sets the electrical operating range and withstand behaviour. The HV bushing is designed for 25 kV single phase, 630 A and 16.7 Hz to 60 Hz, so these are the headline ratings a buyer will check first.

The insulation has to suit the maximum cooling-liquid temperature, and the temperature rise of the bushing is limited. Practically, this means the insulation system and thermal design have to match the transformer’s operating temperature, not only the nominal voltage.

Clause 5.4 and 5.5 link the bushing to railway supply and fault conditions through overvoltage and short-time current withstand. The document also requires an earthing screen to reduce the electric field inside and outside the bushing, and Figure 1 shows its position. That matters because the transformer tank opening and wall thickness affect the field distribution.

Mechanical requirements

Clause 6 requires the bushing to operate properly in all orientations, provided the immersed end remains sufficiently covered by the cooling liquid. The intended mounting orientation should be agreed, usually by drawing, so the transformer builder and the bushing supplier align on installation constraints.

The assembly, including fixings, must achieve at least IP67 and remain oil tight. This is important for preventing moisture and leakage issues in service.

The plug-in end and immersed end both use M16 screwing, and the essential mechanical dimensions are tied to EN 50180 type C. Clause 6.2 defines the mechanical envelope, and Figure 1 shows the maximum outer dimensions. Clause 6.3 also requires the mechanical fixings of the electrical contacts to withstand the operating conditions.

Fire protection, reliability and marking

Clause 7 links fire protection to the customer specification and points to the TS 45545 series as a possible test basis. For procurement, this means fire safety expectations should be settled early, because the document leaves the exact acceptance approach to agreement.

Clause 8 gives an expected lifetime of 30 years and states a reliability target using MTBF (Mean Time Between Failures). In practice, this gives buyers and maintainers a planning basis for life-cycle expectations.

Clause 9 requires a nameplate or label with the manufacturer, the bushing characteristics, serial number, manufacturing date, earth symbol and waste-disposal symbol or code. That supports traceability and installation in fleet service.

Testing

Clause 10 separates type tests from routine tests. Type tests verify the design, while routine tests check each manufactured item, although the document allows agreed alternative procedures for routine testing.

Table 3 lists the minimum test set, which includes tests according to EN 60137, alternating temperature, shock and vibration, impulse, power frequency, partial discharge, cantilever load withstand, X-ray and glass transition temperature. For a reader, this is the checklist for qualification and production acceptance.

What terms does SIST-TS CLC/TS 50537-1:2010 define?

• HV bushing - A device mounted on the traction transformer that connects the supply from the contact wire or contact rail to the primary winding.
• Bushing for separable connector - A plug-in type bushing with one immersed end and one end designed to receive a separable insulated cable connector.
• Overvoltage - Any voltage whose peak exceeds the peak of the maximum steady-state voltage in normal operation.
• Nominal voltage - The designated system value used as the electrical reference.
• Highest permanent voltage - The maximum voltage likely to be present indefinitely.
• Clearance - The shortest distance through air between two conductive parts.
• Creepage distance - The shortest distance along the surface of an insulating material between two conductive parts.
• AQL - Acceptance Quality Limit, the worst tolerable process average for lot-by-lot sampling.
• MTBF - Mean Time Between Failures, used here as a reliability indicator.

Who uses SIST-TS CLC/TS 50537-1:2010?

SIST-TS CLC/TS 50537-1:2010 is used by traction transformer manufacturers, HV bushing suppliers, rolling stock designers, test laboratories and railway buyers. They use it to define interfaces, agree operating conditions, plan qualification tests and accept delivered parts.

It is also relevant for quality managers and procurement teams because it ties together electrical ratings, mechanical fit, markings and testing. For rail operators and integrators, it helps compare products from different suppliers on a common basis.

Which standards are used with SIST-TS CLC/TS 50537-1:2010?

• CLC/TS 50534 - Gives the generic system architecture for onboard electric auxiliary power systems and is identified as the basis for the related series.
• TS 45545 (series) - Provides fire protection guidance for railway vehicles and is referenced for fire safety testing and acceptance.
• EN 50124-1 - Supplies insulation coordination rules and the test basis for impulse and power-frequency withstand.
• EN 50125-1 - Provides environmental conditions for equipment on board rolling stock.
• EN 50163 - Defines traction-system supply voltages used for voltage withstand values and terminology.
• EN 50180 - Gives bushing design conventions and is used for mechanical envelope, type C dimensions and earthing screen guidance.
• EN 50388 - Provides technical criteria for coordination between power supply and rolling stock, used for short-time current values.
• EN 60068-2-14 - Provides the alternating temperature test method.
• EN 60137 - Provides typical bushing tests, partial discharge method and dimensional and visual checks.
• EN 60310 - Covers traction transformers and inductors on board rolling stock and supports the impulse test requirement.
• EN 60529 - Defines IP degrees of protection, used here for IP67.
• EN 60721-3-5 - Provides environmental severity classes for ground vehicle installations.
• EN 61006 - Provides the test method for glass transition temperature.
• EN 61373 - Provides shock and vibration test conditions for rolling stock equipment.
• IEC 60050-551 - Supplies power electronics terminology used in the definitions.
• ISO 2859-1 - Provides sampling procedures and the definition of AQL.

What does the SIST-TS CLC/TS 50537-1:2010 document contain?

The document contains the scope, terms, operating conditions, electrical and mechanical requirements, fire protection guidance, reliability and lifetime statements, markings and a test section. It also includes Table 1 for overvoltage values, Table 2 for short-time current values and Table 3 for the test list.

Figures 1 and 2 show the bushing envelope, earthing screen position and the immersed-end arrangements. Annex A adds informative examples for the mechanical flange, flange ring and pressure part, which helps designers and installers interpret the mounting interface.

SLOVENSKI STANDARD
01-april-2010
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Railway applications - Mounted parts of the traction transformer and cooling system -
Part 1: HV bushing for traction transformers
Bahnanwendungen - Anbauteile des Haupttransformators und Kühlsystems - Teil 1:
Hochspannungsdurchführung für Haupttransformatoren
Applications ferroviaires - Accessoires des transformateurs de traction et systèmes de
refroidissement - Partie 1: Traversées haute tension pour transformateurs de traction
Ta slovenski standard je istoveten z: CLC/TS 50537-1:2010
ICS:
29.180 Transformatorji. Dušilke Transformers. Reactors
45.060.01 Železniška vozila na splošno Railway rolling stock in
general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

TECHNICAL SPECIFICATION
CLC/TS 50537-1
SPÉCIFICATION TECHNIQUE
February 2010
TECHNISCHE SPEZIFIKATION
ICS 29.180; 45.060.10
English version
Railway applications -
Mounted parts of the traction transformer and cooling system -
Part 1: HV bushing for traction transformers

Applications ferroviaires -  Bahnanwendungen -
Accessoires des transformateurs Anbauteile des Haupttransformators
de traction et systèmes und Kühlsystems -
de refroidissement - Teil 1: Hochspannungsdurchführung
Partie 1: Traversées haute tension für Haupttransformatoren
pour transformateurs de traction

This Technical Specification was approved by CENELEC on 2010-01-22.

CENELEC members are required to announce the existence of this TS in the same way as for an EN and to
make the TS available promptly at national level in an appropriate form. It is permissible to keep conflicting
national standards in force.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, 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: Avenue Marnix 17, B - 1000 Brussels

© 2010 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. CLC/TS 50537-1:2010 E

Foreword
This Technical Specification was prepared by Working Group 23 of SC 9XB, Electromechanical
material on board of rolling stock, of Technical Committee CENELEC TC 9X, Electrical and electronic
applications for railways.
It was circulated for voting in accordance with the Internal Regulations, Part 2, Subclause 11.3.3.3 and
was accepted as a CENELEC Technical Specification on 2010-01-22.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent
rights.
The following date was fixed:
– latest date by which the existence of the CLC/TS
has to be announced at national level (doa) 2010-07-22
The CLC/TS 50537 series “Railway applications – Mounted parts of the traction transformer and
cooling system” consists of four different parts:
• Part 1: HV bushing for traction transformers;
• Part 2: Pump for insulating liquid for traction transformers and reactors;
• Part 3: Water pump for traction converters;
• Part 4: Gas and liquid actuated (Buchholz) relay for liquid immersed transformers and reactors
with conservator for rail vehicles.
1)
The CLC/TS 50537 series shall be read in conjunction with CLC/TS 50534 “Railway applications –
Generic system architectures for onboard electric auxiliary power systems”.
This standardization project was derived from the EU-funded Research project MODTRAIN
(MODPOWER). It is part of a series of standards, referring to each other. The hierarchy of the
standards is intended to be as follows:
———————
1)
Under development.
- 3 - CLC/TS 50537-1:2010
Overview on the technical framework
CLC/TS 50534 defines the basis for other depending standards
CLC/TS 50534
Railway applications - Generic system architectures for
onboard electric auxiliary powers systems
Level 1: Architectures
EN 50546
CLC/TS 50535 EN 50533
Shore (external) supply systems
Railway applications - Onboard Three-phase train line voltage
for rail vehicles
auxiliary power converter system characteristics
Level 2: Systems, Interfaces
CLC/TS 50537-1
EN 50547 CLC/TS 50537-2
Part 1: HV bushing for traction
Batteries for rail vehicles
Part 2: Pump for insulating liquid for
transformers
traction transformers and reactors
CLC/TS 50537-4
CLC/TS 50537-3
Part 4: Gas and liquid actuated
Part 3: Water pump for traction
(Buchholz) relay for liquid immersed
converters
transformers and reactors with
conservator for rail vehicles
Level 3: Components
Mounted parts of the traction transformer and cooling system

Contents
1 Scope . 6
2 Normative references. 6
3 Terms, definitions and abbreviations . 7
3.1 Terms and definitions . 7
3.2 Abbreviations . 9
4 Operating conditions . 9
4.1 General . 9
4.2 Environmental conditions . 9
4.3 Cooling liquid .10
4.4 Shock and vibration .10
4.5 Storage and transport conditions .10
5 Electrical requirements .10
5.1 General .10
5.2 Insulation class and temperature rise .10
5.3 Rated voltage, current and frequency .10
5.4 Overvoltages .11
5.5 Short-time currents .11
5.6 Earthing screen .11
6 Mechanical requirements .12
6.1 General .12
6.2 Mechanical envelope .12
6.3 Plug-in end and immersed end .12
7 Fire protection .13
8 Reliability and lifetime .13
9 M arkings .14
10 Testing .14
10.1 General .14
10.2 List of tests .15
10.3 Description of tests .15
Annex A (informative)  Mechanical flange, flange ring and pressure part .17
A.1 Mechanical flange and its fixings .17
A.2 Flange ring and pressure part .17
Bibliography .19

- 5 - CLC/TS 50537-1:2010
Figures
Figure 1 – Maximum outer dimensions of the HV bushing (envelope) and earthing screen position .12
Figure 2 – Immersed end (with outside and inside thread) .13
Figure A.1 – Mechanical flange and its fixings .17
Figure A.2 – Pressure part .18
Figure A.3 – Flange ring .18

Tables
Table 1 .11
Table 2 .11
Table 3 – List of tests .15

1 Scope
This Technical Specification is applicable to high voltage (HV) bushings, intended for use in traction
transformers of rail vehicles, cooled by insulating liquid with rated voltages up to 25 kV single phase
and rated currents up to 630 A at frequencies from 16,7 Hz to 60 Hz.
HV bushings within the scope of this Technical Specification are bushings for separable connectors
that connect the power supply coming from a contact wire or from a contact rail to the primary winding
of the traction transformer. The Technical Specification only deals with HV bushings that are mounted
to the transformer.
CLC/TS 50537-1 gives consideration to both technical and normative requirements of the railway
environment and restricts the variety provided by industry-wide standards for bushings, such as
EN 50180 and EN 60137. It determines requirements and tests enabling the interchangeability
especially regarding electrical and mechanical interfaces. Furthermore, service conditions are
described.
The cable plug as the counterpart of the HV bushing’s plug-in end is not covered by this Technical
Specification.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
2)
TS 45545 (series):2009 Railway applications – Fire protection on railway vehicles
3)
CLC/TS 50534 Railway applications – Generic system architecture for onboard electric
auxiliary power systems
EN 50124-1:2001 Railway applications – Insulation coordination – Part 1: Basic
+ A1:2003 requirements – Clearances and creepage distances for all electrical and
+ A2:2005 electronic equipment
EN 50125-1:1999 Railway applications – Environmental conditions for equipment – Part 1:
Equipment on board rolling stock
EN 50163:2004 Railway applications – Supply voltages of traction systems
+ A1:2007
EN 50180:1997 Bushings above 1 kV up to 36 kV and from 250 A to 3,15 kA for liquid
filled transformers
EN 50388:2005 Railway applications – Power supply and rolling stock – Technical criteria
for the coordination between power supply (substation) and rolling stock
to achieve interoperability
EN 60068-2-14:2009 Environmental testing – Part 2-14: Tests – Test N: Change of temperature
(IEC 60068-2-14:2009)
EN 60137:2008 Insulated bushings for alternating voltages above 1 000 V
(IEC 60137:2008)
———————
2)
Part 5 is of CENELEC origin – Other parts are from CEN.
3)
Under development.
- 7 - CLC/TS 50537-1:2010
EN 60310:2004 Railway applications – Traction transformers and inductors on board
rolling stock (IEC 60310:2004)
EN 60529:1991 Degrees of protection provided by enclosures (IP code)
+ A1:2000 (IEC 60529:1989 + A1:1999)
EN 60721-3-5:1997 Classification of environmental conditions – Part 3: Classification of
groups of environmental parameters and their severities – Section 5:
Ground vehicle installations (IEC 60721-3-5:1997)
EN 61006:2004 Electrical insulating materials – Methods of test for the determination of
the glass transition temperature (IEC 61006:2004)
EN 61373:1999 Railway applications – Rolling stock equipment – Shock and vibration test
(IEC 61373:1999)
IEC 60050-551:1998 International Electrotechnical Vocabulary – Part 551: Power electronics
ISO 2859-1:1999 Sampling procedures for inspection by attributes – Part 1: Sampling
+ Cor 1:2001 schemes indexed by acceptance quality limit (AQL) for lot-by-lot
inspection
3 Terms, definitions and abbreviations
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-551:1998 and the
following apply.
3.1.1
HV bushing
device mounted to the traction transformer which connects the power supply coming from a contact
wire or a contact rail to the primary winding of the traction transformer
3.1.2
bushing for separable connector
plug-in type bushing. One end of the bushing is immersed in an insulating medium and the other end
designed to receive a separable insulated cable connector, without which the bushing cannot function
[see also EN 60137]
3.1.3
overvoltage
any voltage having a peak value exceeding the corresponding peak value of maximum steady-state
voltage at normal operating conditions
[EN 50124-1]
3.1.4
temporary overvoltage
overvoltage of relatively long duration due to voltage variations
[EN 50124-1]
3.1.5
transient overvoltage
short duration overvoltage of a few milliseconds or less due to current transfer
[EN 50124-1]
3.1.6
nominal voltage
designated value for a system
[EN 50163]
3.1.7
highest permanent voltage
maximum value of the voltage likely to be present indefinitely
[EN 50163]
3.1.8
highest non permanent voltage
maximum value of the voltage likely to be present as highest non permanent voltage for a limited
period of time
[EN 50163]
3.1.9
highest long term overvoltage
voltage defined as the highest value of the long-term overvoltage for t = 20 ms. This value is
independent from frequency
[EN 50163]
3.1.10
rated impulse voltage
impulse voltage value assigned b
...