CLC/TS 50534:2010

SLOVENSKI STANDARD
01-december-2010
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Railway applications - Generic system architectures for onboard electric auxiliary power
systems
Bahnanwendungen - Generische Systemarchitekturen für elektrische Bordnetze zur
Hilfsbetriebeversorgung
Applications ferroviaires - Architectures des systèmes génériques pour le système
d’alimentation en énergie embarqué de véhicules ferroviaires
Ta slovenski standard je istoveten z: CLC/TS 50534:2010
ICS:
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 50534
SPÉCIFICATION TECHNIQUE
April 2010
TECHNISCHE SPEZIFIKATION
ICS 45.060.01
English version
Railway applications -
Generic system architectures for onboard electric auxiliary power
systems
Applications ferroviaires -  Bahnanwendungen -
Architectures des systèmes génériques Generische Systemarchitekturen
pour le système d’alimentation en énergie für elektrische Bordnetze
embarqué de véhicules ferroviaires zur Hilfsbetriebeversorgung

This Technical Specification was approved by CENELEC on 2010-03-26.

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

Management Centre: 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 50534:2010 E
Foreword
This Technical Specification was prepared by 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 2010-03-26.
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) 2010-09-26
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:

Annexes defined to be normative belong to the content of this Technical Specification; annexes
defined as informative are used only for information.
Annex A is classified as normative and Annex B is classified as informative.
__________
– 3 – CLC/TS 50534:2010
Contents
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms, definitions and abbreviations . 6
3.1 Terms and definitions . 6
3.2 Abbreviations . 9
4 General conditions . 9
4.1 Vehicle concepts . 9
4.2 Generic functions of onboard power supply systems .10
4.3 Generic design and test conditions for onboard power supply products .12
4.4 Generic auxiliary load configuration and power requirements .12
4.5 Common architectural characteristics of the distribution grids .12
5 System architectures for onboard power supply systems .14
5.1 Locomotive hauled passenger trains .14
5.2 Trains (Electric Multiple Units, EMU) with distributed power .16
5.3 Trains with concentrated (head end) power .22
Annex A (normative) Single pole power supply train line voltages (RIC train line) .28
Annex B (informative) Examples for auxiliary loads and estimated power ratings .29
Bibliography .31

Figures
Figure 1 – Train types for the development of the generic system architectures .10
Figure 2 – Functional overview of the on-board power supply systems .11
Figure 3 – Target system architecture for class A, RIC power supply train line .14
Figure 4 – Target system architecture for train class C0, 3 AC FF power supply train line
and fixed frequency supplied HVAC units .16
Figure 5 – Optional target system architecture for train class C0, 3 AC FF power train line and
centralized 3 AC VVVF supplied HVAC units .19
Figure 6 – Target system architecture for train type C1, fixed frequency supply of HVAC units .22
Figure 7 – Optional target system architecture for train class C1, 3 AC FF and centralized variable
frequency supply of HVAC units .25

Tables
Table A.1 – Nominal voltages and tolerances of the single pole train line voltage .28
Table A.2 – Frequencies of the single pole power supply train line voltage systems .28
Table B.1 – Typical traction auxiliary loads and comfort loads .29
Table B.2 – Examples of (estimated) power ratings for auxiliary loads used in coaches .30

Introduction
This Technical Specification defines characteristics and interfaces for electric onboard power supply
systems. The following European Standards and Technical Specifications refer to the defined target
energy supply system in this present Technical Specification:
CLC/TS 50535 Railway applications – Onboard auxiliary power converter systems
(Auxiliary converter interfaces applicable for the different options defined in
the target system architectures)
1)
EN 50533 Railway applications – Three-phase train line voltage characteristics
(Characteristics of the voltage system used for auxiliary power supply)
2)
EN 50546 Railway applications – Shore (external) supply system for rail vehicles
(Interface description of the shore supply including protection functions)
2)
EN 50547 Railway applications – Batteries for rail vehicles
(Standardized batteries for rail vehicles and charging characteristics)
CLC/TS 50537 (series) Railway applications – Mounted parts of the traction transformer and
cooling system
(Standardized products used in conjunction with traction transformers and
traction cooling systems)
CLC/TS 50534 has to be understood as a basic document of a set of hierarchically structured
specifications. This set of European Standards and Technical Specifications defines a consistent
technical framework beginning on an architectural level, followed by standards belonging to important
system interfaces and concluding this hierarchy with Technical Specifications on component level. The
diagram in the foreword points up these different system integration levels and shows the
dependencies between the documents.
One main objective of this standardisation initiative is to simplify the cooperation between concerned
railway stakeholders in charge of operating onboard auxiliary power systems, designing systems able
to cope with the operational requirements and stakeholders manufacturing auxiliary power system
components, which provide the requested services.
———————
1)
At draft stage.
2)
Under development.
– 5 – CLC/TS 50534:2010
1 Scope
This Technical Specification defines characteristics and interfaces for electric onboard power supply
systems. It applies to locomotive hauled passenger trains and electric multiple units with distributed
power as well as trains with concentrated power for main-line application.
The objective of this Technical Specification is to define target systems, as regards the following
interfaces and characteristics in order to enable further standardisation:
• interface between traction system and auxiliary power supply system;
• train line type: voltage, frequency and number of poles;
• interface between auxiliary power supply system and battery system;
• interface of the auxiliary power supply system as well as the low voltage grid to a shore supply
(stationary workshop supply or external supply);
• supply concepts for essential loads e.g. HVAC systems and battery chargers;
• redundancy concept within the supply systems;
• auxiliary load control and protection strategy at train level.
Described system and interface characteristics define the technical basis for dependent European
Standards and Technical Specifications. The introduction of this Technical Specification shows this
dependency to adjacent documents.
Starting from a generic functional description of electric onboard energy supply systems structured in
line with EN 15380-4 and a description of the related vehicle concepts, generic system architectures
are derived, which are illustrated by examples of consistent sets of system designs showing interfaces
and dependencies among concerned subsystems.
Relevant train configuration and concerned energy supply subsystems in scope of this Technical
Specification are defined in Clause 4.
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.

CLC/TS 50535 Railway applications – Onboard auxiliary power converter systems
EN 50125-1 1999 Railway applications – Environmental conditions for equipment –
Part 1: Equipment on board rolling stock
3)
EN 15380-4 Railway applications – Environmental conditions for equipment –
Part 1: Equipment on board rolling stock
EN 50153 2002 Railway applications – Rolling stock – Protective provisions relating
to electrical hazards
EN 50155 2007 Railway applications – Electronic equipment used on rolling stock
3)
EN 50533 Railway applications – Three-phase train line voltage characteristics
———————
3)
At draft stage.
EN 60077-1 2002 Railway applications – Electric equipment for rolling stock –
Part 1: General service conditions and general rules
(IEC 60077-1:1999, mod.)
EN 60077-2 2002 Railway applications – Electric equipment for rolling stock –
Part 2: Electrotechnical components – General rules
(IEC 60077-2:1999, mod.)
EN 60310 2004 Railway applications – Traction transformers and inductors on board
rolling stock (IEC 60310:2004)
EN 60349-2 2001 Railway applications – Rotating electrical machines for rail and road
vehicles – Part 2: Electronic converter-fed alternating current motors
(IEC 60349-2:1993, mod.)
EN 61287-1 2006 Railway applications – Power convertors installed on board rolling
stock – Part 1: Characteristics and test methods
(IEC 61287-1:2005)
4)
IEC 60038 2002 IEC standard voltages
3 Terms, definitions and abbreviations
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1.1
trainset
fixed formation that can only be reconfigured within a workshop environment
3.1.2
Electrical Multiple Units (EMU)
trainsets where all vehicles are capable of carrying payload. EMUs in scope of this Technical
Specification belong to the main line sector. Light rail vehicles and metros are excluded from the
scope of this Technical Specification
3.1.3
train section
functional and potentially independent subset of the electric system. It contains propulsion and
auxiliary power equipments together with auxiliary loads and batteries
3.1.4
power head
traction vehicle of the trainset with a single driver’s cab at one end, which is not capable of carrying
payload
3.1.5
locomotive
traction vehicle that is not capable of carrying a payload and has the ability to uncouple in normal
operation from a train and operate independently
———————
4)
IEC 60038:2002 (Ed. 6.2) combines IEC 60038:1983 (Ed. 6) + A1:1994 + A2:1997. It is superseded by IEC 60038:2009
(Ed. 7), IEC standard voltages.

– 7 – CLC/TS 50534:2010
3.1.6
locomotive hauled passenger trains
trains which consist of one or more locomotive and several coaches coupled to the locomotive to build
a complete train. In contrast to EMUs the number of coaches and the position of the locomotive can
be changed while in operation and in a short time without the need of a workshop and specific tools
3.1.7
system architectures
system architectures describe basic designs of systems consisting of several subsystems and
functions. The description is precise in concern of essential interfaces and functions. The internal
design of the subsystems itself is not part of the architecture description
3.1.8
auxiliary power supply systems
onboard subsystem, which transforms converts and distributes electric energy for traction auxiliary
loads and comfort loads. In most applications the low voltage supply system is fed by the auxiliary
power system. Refer to 3.5
3.1.9
low voltage supply systems
LV-DC system
low voltage supply system encompasses DC voltage supplies for control units, lighting and other
loads, which need an uninterruptible, and highly available electric energy supply. In most applications,
the low voltage supply system is fed by the auxiliary power supply system and supported e.g. by a
rechargeable battery
3.1.10
traction auxiliary loads
loads installed in subsystems, which are needed for the operation of the traction system and driving
operation of the train or locomotive. Pumps and fans in cooling systems for traction components are
representative examples of this load group. Compared to other auxiliary loads (comfort loads) a high
availability is required
3.1.11
comfort loads
loads connected to the auxiliary power supply system, which are used for the provision of a
comfortable environment e.g. in the passenger coach interior, vestibule or other compartments for
passengers and train crew. Compared to traction auxiliary loads the requested availability for comfort
loads is lower and a reduced performance in degraded mode might be accepted
3.1.12
HVAC unit
facility installed in coaches or locomotives used for heating, ventilation and air conditioning
3.1.13
Battery Charger (BC)
power electronic converter (AC-DC or DC-DC) used to supply low voltage loads and to charge
rechargeable batteries in the low voltage grid
3.1.14
power train line
electric energy distribution facility (e.g. bus bars, cables) used for the distribution of auxiliary power in
a train and coaches
3.1.15
linear load
loads with a linear dependency between supply voltage and current producing negligible harmonic
content compared to rated values, e.g. heating resistors and induction motors are regarded as linear
loads
3.1.16
non-linear load
in contrast to linear loads non-linear loads generate significant harmonic current or voltage content.
These kinds of loads connected to a supply system with significant internal impedance will produce
significant harmonic voltages, e.g. uncontrolled rectifiers and active front-end converters belong to this
load group
3.1.17
unbalanced load
loads which will cause unsymmetrical phase currents, i.e. currents that have different amplitudes
and/or phase angles in the three phases of a 3 AC supply system. Single phase loads connected to a
3 AC system are a representative example of unbalanced loads
3.1.18
3 AC voltage system
three-phase a.c. voltage systems involving three or four wire (including neutral wire) distribution
3.1.19
1 AC voltage system
single phase a.c. voltage systems
3.1.20
3 AC FF train line voltage systems
voltage systems applied in conjunction with 3 AC power train lines using fixed frequency and
consequently fixed voltage amplitude (3 AC 400 V 50 Hz or 3 AC 480 V 60 Hz in accordance with
IEC 60038)
3.1.21
3 AC VF train line voltage systems
voltage systems applied in conjunction with 3 AC power train lines using variable frequency and
consequently variable voltage amplitude. Variation of frequency and voltage is used e.g. for power
control and noise reduction purposes
3.1.22
RIC train line
power train line in accordance with the voltage systems defined in Annex A, mainly used as a single
pole train line in locomotive hauled passenger trains
3.1.23
auxiliary converter intermediate circuit voltage
DC Link Auxiliary (DCLA)
intermediate circuit voltage in a voltage range of typically 600 V to 800 V used in auxiliary converters
e.g. with 3 AC FF output
3.1.24
traction converter intermediate circuit voltage
DC Link Traction (DCLT)
intermediate circuit voltage of the traction converter
3.1.25
Train Line Interconnection (TLI)
electric interface between adjacent power train line sections, being supplied by different converter
units. The TLI can either be a solid through connection or a contactor. The contactor will be opened or
closed dependent on the auxiliary power supply systems status. During normal operation, the
contactor will be open whereas in a case of a failed auxiliary converter the contactor will be closed in
order to supply adjacent train sections

– 9 – CLC/TS 50534:2010
3.2 Abbreviations
For the purposes of this document, the following abbreviations apply.
3 AC Three-phase Alternative Current or voltage
BC Battery Charger
DC Direct Current
DCLA DC Link Auxiliary
DCLT DC Link Traction
EMU Electrical Multiple Units
FF Fixed Frequency
HVAC Heating, Ventilation and Air Conditioning
LV-DC Low voltage supply system
RIC Regolamento Internazionale delle Carrozze
TLI Train Line Interconnection
VF Variable Frequency
4 General conditions
4.1 Vehicle concepts
The generic system architectures in the scope of this Technical Specification refer to three different
train classes used for passenger transport (Figure 1). System architectures for energy supply systems
have to be designed with respect to quantitative auxiliary power requirements and depending load
characteristics in order to fulfil specific design aspects. Some examples of power ratings for auxiliary
loads are given in Table B.2. Specific values used on trains depend on e.g. motorisation in conjunction
with the used cooling system (e.g. natural-cooled, forced-air-cooled, and water-cooled) for traction
components, climate (HVAC units design) as well as number and type of other comfort loads installed
on the train.
Figure 1 – Train types for the development of the generic system architectures
Train type "class A" comprises conventional locomotive hauled passenger trains with coaches, which
can be separated and configured operationally without any specific infrastructure.
Train type "class C0" encompasses trains with distributed power. The traction system is distributed
with multiple driven axles along the train depending on traction power requirements and other specific
design conditions. Auxiliary supply systems used on train class C0 provide power for comfort loads
and traction auxiliary loads.
Train type "class C1" describes a fixed trainset with concentrated power installed in power heads
located at the end of the trainset. Figure 1 shows a typical configuration with two power heads at each
end of the trainset. Other solutions with one power head or power heads with powered bogies in
adjacent coaches belong to class C1 as well.
4.2 Generic functions of onboard power supply systems
Onboard electric power supply systems can be subdivided in accordance with the functional
breakdown structure EN 15380-4 into three different main power supply functions. All electric power
supply systems correspond to this generic functional description. Standardized system architectures
shall comply with this basic functional structure.
Figure 2 shows the main functions of the onboard power supply system including the relevant load
groups. Functional blocks enclosed in dotted lines refer to the technical scope of the Technical
Specification. The other function blocks are used to describe the dependency between the auxiliary
power supply functions and the overall energy supply system. Arrows between the function blocks
indicate the main energy flow paths. In a specific system design only a subset of this energy flow
paths will be realized.
– 11 – CLC/TS 50534:2010
Electric energy Electric to mechanical
Energy collection Energy transformation
conversion energy conversion
1AC
DC
DC M M
3AC 3AC
3AC
1AC
DC
DC
M M
3AC 3AC
3AC
Distribution grid,
Auxiliary loads
auxiliary power
Auxiliary energy
conversion
Fans
1AC
Pumps
3AC
Heating
Air Conditioning
DC
etc.
shore supply, auxiliary power
3AC
Low voltage loads
Low voltage grid
shore supply, low voltage
Low voltage
conversion
Lighting
Control units
BC
etc.
Electric energy
storage
Functional scope for
the auxiliary power system architectures

Figure 2 – Functional overview of the on-board power supply systems
The traction energy supply chain provides energy needed for the generation of tractive and braking
effort needed for acceleration, braking (rheostatic and regenerative braking) and maintaining the
speed of the vehicle. In this supply chain, traction energy passes the energy collection function, the
energy transformation function and two energy conversion stages. Most figures in this document show
current collection by pantographs. Other collection systems like third rail contact shoes are possible.
The auxiliary power supply chain is needed for the supply of traction auxiliary loads as well as comfort
loads in trains and locomotives. The auxiliary power supply chain receives its energy either from the
traction system or, during vehicle standstill; a supply via an external shore supply shall be possible.
With respect to the different kinds of input energy supplies, the auxiliary power has to be transformed
into an appropriate voltage system, which feeds the widely branched auxiliary power supply
distribution grid. The distribution facilities include measures for over-voltage and over-current
protection as well as earth fault detection.
The third kind of electric energy supply used on rolling stock is dedicated to low voltage products e.g.
control units, lighting, emergency fans and other loads, which need an uninterruptible power supply
independent from the availability of the line voltage. During vehicle standstill, an external supply
should be possible, which feeds the low voltage supply grid. The battery itself is charged by its own
battery charger, which is supplied either from the 3 AC power supply or from the DCLA. An electric
energy storage device e.g. lead acid or NiCd batteries ensure continuity of load power and line
independence.
In neutral sections the auxiliary loads should be supplied by the onboard energy supply systems.
Specific operational requirements have to be agreed between customer and supplier.

4.3 Generic design and test conditions for onboard power supply products
For components used in onboard energy supply systems specific standards exist defining product
specific requirements concerning design and operation as well as test equipment and test conditions.
Environmental conditions for products used on rolling stock are defined in EN 50125-1, EN 60077-1
and EN 60077-2. Components used in conjunction with the system architectures described in
Clause 5 shall comply with the requirements of these standards.
Electronic equipment used for the onboard energy supply systems shall be designed and tested in
accordance with EN 50155.
Converters used in traction and auxiliary power supply systems shall be designed in accordance with
EN 61287-1. Respectively auxiliary motors shall comply with EN 60349-2 and transformers as well as
inductors shall meet requirements defined in EN 60310.
4.4 Generic auxiliary load configuration and power requirements
System architectures depend on type and power requirements of connected auxiliary loads.
The following characteristics have an impact on the system design. They shall be considered for the
development of the target system architectures:
• total power needed for auxiliary loads (or load requirements per coach);
• redundancy requirements;
• share of linear loads in relation to the total auxiliary power distributed along the power train line;
• share of nonlinear loads in relation to the total auxiliary power distributed along the power train line;
• share of unbalanced loads in relation to the total auxiliary power distributed along the power train line;
• load requirements for the HVAC system especially air-conditioning and heating;
• loads with specific design requirements e.g. passenger sockets, galley loads.
Specific values for these design characteristics depend on the type of rolling stock and the specific
design of the coaches. Estimated reference figures are summarized in Annex B. The values shown
reflect state of the art technology as well as comfort requirements in modern rolling stock.
These figures help to evaluate the impact of the different load groups with their specific power
requirements on the overall system design.
4.5 Common architectural characteristics of the distribution grids
The generic system architectures defined in Clause 5 have the following common characteristics.
4.5.1 3 AC FF distribution grid (fixed frequency)
• Train line configuration 3 AC 480 V 60 Hz: If auxiliary power is distributed along the train with a
3 AC 480 V 60 Hz supply system, three wire distribution facilities without neutral wire shall be
used.
• Train line configuration 3 AC 400 V 50 Hz: If auxiliary power is distributed along the train with a
3 AC 400 V 50 Hz supply system either a three wire or four wire (including neutral wire)
distribution facilities shall be used.
• 3 AC train line characteristics shall be according to EN 50533.

– 13 – CLC/TS 50534:2010
• Voltage reference of the 3 AC train lines to vehicle ground: The operator or the customer
shall agree with the system integrator whether the auxiliary power supply will be grounded or
floating (with the provision of a finite impedance between the distribution grid and vehicle ground).
They shall also agree how to operate under ground fault conditions.
• Verification process for non-linear loads in order to guarantee standardized 3 AC train line
characteristics: Regardless of the specific auxiliary load configuration, the overall system design
shall ensure that the 3 AC train line voltage characteristics comply with EN 50533. Non-linear
loads with significant harmonic input currents could cause voltage distortions exceeding defined
limit values in the standard. System integrator and supplier of non-linear loads, which are
connected to the 3 AC train line, shall follow the analysis and verification process defined in
CLC/TS 50535. Input filters or an Active-Front-End converter as input rectifier may be required in
order to meet defined requirements.
4.5.2 3 AC VF distribution grid (Variable Voltage Variable Frequency)
• Train line configuration 3 AC VF: If auxiliary power is distributed along the train with a 3 AC VF
supply system, three wire distribution facilities without neutral wire shall be used.
• VVVF control principle: The ratio between voltage and frequency shall be kept constant within
the whole frequency range. The typical control range could vary e.g. within following limits; 240 V
to 480 V and 30 Hz to 60 Hz.
• 3 AC train line characteristics: The train line voltage shall be sinusoidal within the whole
frequency range. For 50 Hz and 60 Hz operation it should comply with characteristics defined in
EN 50533.
4.5.3 Socket supply in passenger coaches: 1 AC 230 V 50 Hz
• Voltage supply system: Sockets installed in coaches for passengers and staff shall provide a
voltage system of 1 AC 230 V 50 Hz. In order to enable the use of general purpose products, the
voltage and frequency characteristics shall comply with IEC 60038.
• Voltage reference of the socket supply to ground: The 1 AC socket supply system shall be
galvanically isolated from the main power supply systems.
• Mechanical design of the sockets: The mechanical design and dimension of the sockets shall
be agreed between operator or customer and system integrator.
4.5.4 LV-DC distribution grid
• Voltage characteristics: Low voltage DC loads shall be supplied with DC 110 V. Voltage
characteristics and tolerances of the DC 110 V LV-DC system shall comply with EN 50155.
• Voltage reference LV-DC
...