CLC/TS 50537-4:2010

SLOVENSKI STANDARD
01-april-2010
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Railway applications - Mounted parts of the traction transformer and cooling system -
Part 4: Gas and liquid actuated (Buchholz) relay for liquid immersed transformers and
reactors with conservator for rail vehicles
Bahnanwendungen - Anbauteile des Haupttransformators und Kühlsystems - Part 4:
Buchholzrelais für Transformatoren und Drosselspulen
Applications ferroviaires - Accessoires des transformateurs de traction et systèmes de
refroidissement - Partie 4: Relais de protection (Buchholz) pour transformateurs de
matériel roulant ferroviaire
Ta slovenski standard je istoveten z: CLC/TS 50537-4:2010
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 50537-4
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 4: Gas and liquid actuated (Buchholz) relay for liquid immersed
transformers and reactors with conservator for rail vehicles

Applications ferroviaires -  Bahnanwendungen -
Accessoires des transformateurs Anbauteile des Haupttransformators
de traction et systèmes und Kühlsystems -
de refroidissement - Part 4: Buchholzrelais für Transformatoren
Partie 4: Relais de protection (Buchholz) und Drosselspulen
pour transformateurs de matériel roulant
ferroviaire
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 50537-4:2010 E

Foreword
This Technical Specification was prepared by Working Group 25 of SC 9XB, Electromechanical
material on board 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.
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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 . 7
4 Service conditions . 7
4.1 General . 7
4.2 Environmental conditions . 7
4.3 Cooling liquid . 8
4.4 Shock and vibration . 8
4.5 Storage and transportation conditions . 8
4.6 Maximum inclination . 8
4.7 Operating pressure . 8
4.8 Sensitivity of the relay contacts to magnetic fields . 8
5 Operational performance . 8
5.1 Alarm and tripping contact . 8
5.2 Liquid loss from the tank . 9
5.3 Latching of trip contact . 9
6 Electrical requirements . 9
6.1 Switch type . 9
6.2 Rated current . 9
6.3 Breaking and making capacity . 9
7 Mechanical requirements .10
7.1 Main dimensions .10
7.2 Pipe connection.11
7.3 Terminal box .11
7.4 Testing equipment .11
7.5 Gas sampling .11
7.6 Presence of gas in the relay .11
7.7 Mounting instruction .11
8 Reliability and lifetime .12
9 Material .12
10 M arkings .12
11 Documentation .12
12 Testing .13
12.1 General .13
12.2 List of tests .14
12.3 Description of tests .14
Bibliography .15

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Figures
Figure 1 – Main dimensions of the Buchholz relay . 10
Tables
Table 1 – Breaking capacity . 9
Table 2 – Maximum mechanical dimensions . 10
Table 3 – Minimum clearance for installation, accessibility and gas sampling . 10
Table 4 – Mandatory clearance for maintenance and interchangeability . 11
Table 5 – List of tests . 14

1 Scope
This Technical Specification covers gas and liquid actuated (Buchholz) relays for liquid immersed
transformers and reactors with conservator for rail vehicles.
The device is intended to detect
• gas release from the unit to be protected,
• cooling liquid surge from the protected unit to the conservator,
• complete loss of the cooling liquid in the conservator.
This Technical Specification gives consideration to both technical and normative requirements of the
railway environment and restricts the variety in particular provided by the industry-wide standard
EN 50216-2. It determines requirements and tests enabling the interchangeability of Buchholz relays
by defining the following types of interfaces:
• mechanical interface, e.g. flanges for pipe connection, dimensions;
• electrical interface, e.g. supply voltage for making and breaking capability;
• functional interface, e.g. protective operational behaviour.
It is not applicable to flameproof relays. Different liquids may be used, which are typically used for both
cooling and insulating.
Furthermore, operating conditions are described.
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)
Railway applications – Generic system architecture for onboard electric
CLC/TS 50534
auxiliary power systems
EN 50125-1:1999 Railway applications – Environmental conditions for equipment –
Part 1: Equipment on board rolling stock
EN 50216-2:2002 Power transformer and reactor fittings – Part 2: Gas and oil actuated
+ A1:2002 relay for liquid immersed transformers and reactors with conservator
2)
EN 50547 Railway applications – Batteries for rail vehicles
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 60947-5-1:2004 Low-voltage switchgear and controlgear – Part 5-1: Control circuit
+ A1:2009 devices and switching elements – Electromechanical control circuit
devices (IEC 60947-5-1:2003 + A1:2009)
EN 61373:1999 Railway applications – Rolling stock equipment – Shock and vibration
tests (IEC 61373:1999)
...