oSIST prEN 50463-1:2025

SLOVENSKI STANDARD
01-december-2025
Železniške naprave - Merjenje energije na vlaku - 1. del: Splošno
Railway applications - Energy measurement on board trains - Part 1: General
Bahnanwendungen - Energiemessung auf Bahnfahrzeugen - Teil 1: Allgemeines
Applications ferroviaires - Mesure d'énergie à bord des trains - Partie 1 : Généralités
Ta slovenski standard je istoveten z: prEN 50463-1:2025
ICS:
45.060.10 Vlečna vozila Tractive stock
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD DRAFT
prEN 50463-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2025
ICS 45.060.10 Will supersede EN 50463-1:2017; EN 50463-
1:2017/A1:2024
English Version
Railway applications - Energy measurement on board trains -
Part 1: General
Applications ferroviaires - Mesure d'énergie à bord des Bahnanwendungen - Energiemessung auf Bahnfahrzeugen
trains - Partie 1 : Généralités - Teil 1: Allgemeines
This draft European Standard is submitted to CENELEC members for enquiry.
Deadline for CENELEC: 2026-01-23.

It has been drawn up by CLC/TC 9X.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CENELEC 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Project: 81039 Ref. No. prEN 50463-1:2025 E

1 Contents Page
2 European foreword . 4
3 Introduction . 5
4 1 Scope . 8
5 2 Normative references . 8
6 3 Terms, definitions and abbreviations . 9
7 3.1 Terms and definitions . 9
8 3.2 Abbreviations . 14
9 4 Requirements . 15
10 4.1 General . 15
11 4.2 System level requirements . 15
12 4.2.1 General . 15
13 4.2.2 Accuracy . 15
14 4.2.3 EMS operation and power supply . 15
15 4.2.4 EMS measuring input. 16
16 4.2.5 Data handling . 16
17 4.2.6 Hybrid trains . 18
18 4.2.7 RAMS . 19
19 4.2.8 Cybersecurity . 19
20 4.3 Device level requirements . 20
21 4.3.1 Marking and availability of essential data . 20
22 4.3.2 Interfaces . 20
23 4.3.3 Data processing and transfer . 21
24 4.3.4 Software . 21
25 4.3.5 Dataflow security . 22
26 4.3.6 Environmental conditions . 23
27 4.3.7 Mechanical requirements, construction and design . 24
28 4.3.8 Electrical requirements . 25
29 5 Test . 26
30 Annex A (informative) Cybersecurity guideline for an EMS . 27
31 A.1 General . 27
32 A.2 Overview . 27
33 A.3 System under Consideration . 27
34 A.4 Risk Analysis . 27
35 A.5 Detailed Risk Analysis . 28
36 A.6 Procurement of components (component and control systems) . 28
37 A.7 Integration . 30
38 A.8 Cybersecurity Case . 30
39 A.9 Operational/Maintenance Phase - Risk analysis review . 30
40 A.10 Decommissioning . 31
41 A.11 Cybersecurity patch process . 31
42 Annex ZZ (informative) Relationship between this European Standard and the Essential
43 Requirements of Directive 2016/797/EU aimed to be covered . 32
44 Bibliography . 33
46 Figures
47 Figure 1 — EMS functional structure and dataflow diagram . 7
48 Figure 2 — Example of energy index value . 11
49 Figure 3 — CP Commissioning . 17
50 Figure 4 — CP Maintenance . 18
52 Tables
53 Table A.1 — EMS essential functions . 28
54 Table A.2 — EMS correspondence with EN IEC 62443-4-2 . 28
55 Table ZZ.1 — Correspondence between this European Standard, Commission Regulation (EU)
56 N° 1302/2014 concerning the Technical Specification for Interoperability relating to the ‘rolling stock
57 — locomotives and passenger rolling stock’ subsystem of the rail system in the European Union*
58 and Directive (EU) 2016/797 . 32
60 European foreword
61 This document (prEN 50463-1:2025) has been prepared by CLC/TC 9X “Electrical and electronic
62 applications for railways”.
63 The following dates are proposed:
• latest date by which the existence of this (doa) dav + 6 months
document has to be announced at national
level
• latest date by which this document has to be (dop) dav + 12 months
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) dav + 36 months
conflicting with this document have to be (to be confirmed or
withdrawn modified when voting)
64 This document will supersede EN 50463-1:2017 and all of its amendments and corrigenda (if any).
65 prEN 50463-1:2025 includes the following significant technical changes with respect to EN 50463-1:2017:
66 — creation of consumption point (i.e. EMS installed on-board);
67 — introduction of hybrid trains;
68 — grouping and adjusting cybersecurity requirements in new clause and in informative annex;
69 — added Figures on commissioning and maintenance.
70 This document has been prepared under a standardization request addressed to CENELEC by the
71 European Commission. The Standing Committee of the EFTA States subsequently approves these requests
72 for its Member States.
73 For the relationship with EU Legislation, see informative Annex ZZ, which is an integral part of this
74 document.
75 This document is Part 1 of EN 50463 series which consists of the following parts, under the common title
76 Railway applications — Energy measurement on board trains:
77 — Part 1: General;
78 — Part 2: Energy measuring;
79 — Part 3: Data handling;
80 — Part 4: Communication;
81 — Part 5: Conformity assessment.
82 This series of European Standards follows the functional guidelines description in EN ISO/IEC 17000:2004,
83 Annex A “Principles of conformity assessment”, tailored to the energy measurement system (EMS).
84 Introduction
85 The energy measurement system (EMS) provides measurement and data suitable for billing and may also
86 be used for energy management, e.g. energy saving.
87 This series of European Standards uses the functional approach to describe the EMS and on-ground data
88 collecting system (DCS). These functions are implemented in one or more physical devices. The user of this
89 Series of standards is free to choose the physical implementation arrangements.
90 a) Structure and main contents of EN 50463 series:
91 This series of European Standards is divided into five parts. The titles and brief descriptions of each part
92 are given below:
93 1) EN 50463-1 — General:
94 The scope of EN 50463-1 is the energy measurement system (EMS).
95 EN 50463-1 provides system level requirements for the complete EMS and common requirements
96 for all devices implementing one or more functions of the EMS.
97 2) EN 50463-2 — Energy measuring:
98 The scope of EN 50463-2 is the energy measurement function (EMF).
99 The EMF provides measurement of the consumed and regenerated active energy of a railway
100 traction unit. If the traction unit is designed for use on AC electric traction power supply systems the
101 EMF also provides measurement of reactive energy. The EMF provides the measured quantities via
102 an interface to the data handling system.
103 The EMF consists of the three functions: voltage measurement function, current measurement
104 function and energy calculation function. For each of these functions, accuracy classes are
105 specified and associated reference conditions are defined. EN 50463-2 also defines all specific
106 requirements for all functions of the EMF.
107 The voltage measurement function measures the voltage of the contact line (CL) system and the
108 current measurement function measures the current taken from and returned to the CL system.
109 These functions provide signal inputs to the energy calculation function.
110 The energy calculation function inputs the signals from the current and voltage measurement
111 functions and calculates a set of values representing the consumed and regenerated energies.
112 These values are transferred to the data handling system and are used in the creation of compiled
113 energy billing data (CEBD).
114 The standard has been developed taking into account that in some applications the EMF is
115 subjected to legal metrological control. All relevant metrological aspects are covered in EN 50463-2.
116 EN 50463-2 also defines the conformity assessment of the EMF and the functions of the EMF.
117 3) EN 50463-3 — Data handling:
118 The scope of EN 50463-3 is the data handling system (DHS) and the associated requirements of
119 data collecting system (DCS).
120 The on board DHS receives, produces and stores data, ready for transmission to any authorized
121 receiver of data onboard or on ground. The main goal of the DHS is to produce compiled energy
122 billing data (CEBD) and transfer it to an on ground data collecting system (DCS). The DHS can
123 support other functions on board or on ground with data, as long as this does not conflict with the
124 main goal.
125 The DCS on ground receives CEBD, stores the CEBD and transfer it to upstream servers such as
126 settlement system.
127 EN 50463-3 also defines the conformity assessment of the DHS and for the transfer of CEBD to an
128 on-ground DCS.
129 4) EN 50463-4 — Communication:
130 The scope of EN 50463-4 is the communication services.
131 EN 50463-4 gives requirements and guidance regarding the data communication between the
132 functions implemented within EMS as well as between such functions and other on board units
133 where data are exchanged using a communications protocol stack over a dedicated physical
134 interface or a shared network.
135 It includes the board to ground communication service and covers the requirements necessary to
136 support data transfer between DHS and DCS.
137 EN 50463-4 also defines the conformity assessment of the communications services.
138 5) EN 50463-5 — Conformity assessment:
139 The scope of EN 50463-5 is the conformity assessment procedures for the EMS.
140 EN 50463-5 also covers re-verification procedures and conformity assessment in the event of the
141 replacement of a device of the EMS.
142 b) EMS functional structure and dataflow:
143 Figure 1 illustrates the functional structure of the EMS, the relevant operating dataflow and is informative
144 only. Only the main interfaces required by this EN 50463 series are displayed by arrows.
145 Since the communication function is distributed throughout the EMS, it has been widely omitted for
146 clarity, except for the train to ground communication. Not all interfaces are shown.
148 Figure 1 — EMS functional structure and dataflow diagram
149 1 Scope
150 This part of the EN 50463 series describes the purpose of the energy measurement system (EMS), which
151 measures energy consumption on board for applications such as energy billing, energy management, energy
152 saving and others.
153 This part of the EN 50463 series specifies the requirements for the complete EMS and also the requirements
154 for all devices implementing one or more functions of the EMS.
155 This document applies to newly manufactured EMSs for use on-board traction units, powered by AC and/or
156 DC supply voltages as listed in EN 50163, and does not apply to portable EMSs.
157 2 Normative references
158 The following documents are referred to in the text in such a way that some or all of their content constitutes
159 requirements of this document. For dated references, only the edition cited applies. For undated references,
160 the latest edition of the referenced document (including any amendments) applies.
161 EN 50124-1:2017, Railway applications - Insulation coordination - Part 1: Basic requirements - Clearances
162 and creepage distances for all electrical and electronic equipment
163 EN 50125-1:2014, Railway applications - Environmental conditions for equipment - Part 1: Rolling stock and
164 on-board equipment
165 EN 50153:2014, Railway applications — Rolling stock — Protective provisions relating to electrical hazards
166 EN 50155:2021, Railway applications - Rolling stock - Electronic equipment
167 prEN 50463-2:2025, Railway applications - Energy measurement on board trains - Part 2: Energy measuring
168 prEN 50463-3:2025, Railway applications — Energy measurement on board trains — Part 3: Data handling
169 prEN 50463-4:2025, Railway applications — Energy measurement on board trains — Part 4: Communication
170 prEN 50463-5:2025, Railway applications — Energy measurement on board trains — Part 5: Conformity
171 assessment
172 EN 60085:2008, Electrical insulation - Thermal evaluation and designation (IEC 60085:2007)
173 EN 60529:1991, Degrees of protection provided by enclosures (IP Code) (IEC 60529:1989)
174 EN 61010-1:2010, Safety requirements for electrical equipment for measurement, control, and laboratory use
175 - Part 1: General requirements (IEC 61010-1:2010)
176 EN ISO 13732-1:2008, Ergonomics of the thermal environment - Methods for the assessment of human
177 responses to contact with surfaces - Part 1: Hot surfaces (ISO 13732-1:2006)
———————
As impacted by EN 50153:2014/A1:2017 and EN 50153:2014/A2:2020.
As impacted by EN 60529:1991/corrigendum May:1993, EN 60529:1991/A1:2000, EN 60529:1991/A2:2013,
EN 60529:1991/A2:2013/AC:2019-02, and EN 60529:1991/AC:2016-12.
178 3 Terms, definitions and abbreviations
179 3.1 Terms and definitions
180 For the purposes of this document, the following terms and definitions apply.
181 ISO and IEC maintain terminology databases for use in standardization at the following addresses:
182 • ISO Online browsing platform: available at https://www.iso.org/obp
183 • IEC Electropedia: available at http://www.electropedia.org
184 NOTE When possible, the following definitions have been taken from the relevant chapters of the International
185 Electrotechnical Vocabulary (IEV), IEC 60050 series. In such cases, the appropriate IEV reference is given. Certain new
186 definitions or modifications of IEV definitions have been added in this document in order to facilitate understanding.
187 Expression of the performance of electrical and electronic measuring equipment has been taken from EN 60359.
188 3.1.1
189 authenticity
190 state in which information is valid and known to have originated from the stated source
191 [SOURCE: IEC 60050-821:2017, 821-11-05]
192 3.1.2
193 CEBD identification
194 CEBDID
195 sequential number to identify each CEBD
196 Note 1 to entry: See prEN 50463-4:2025, 4.3.4.2.
197 3.1.3
198 CEBD-related data
199 data produced by any function of the EMS required for the production of CEBD
200 Note 1 to entry: This includes energy data, time data, location data, quality codes and electric traction power supply
201 system code.
202 3.1.4
203 compiled energy billing data
204 CEBD
205 dataset compiled by the DHS suitable for energy billing
206 3.1.5
207 consumption point
208 CP
209 EMS installed on board
210 Note 1 to entry: A traction unit might have more than one Consumption Point. Each Consumption Point has one EMS.
211 3.1.6
212 consumption point identification
213 CPID
214 unique identifier allocated to each EMS installed on-board a traction unit
215 3.1.7
216 contact line
217 CL
218 conductor system for supplying electric energy to a traction unit through current-collecting equipment
219 [SOURCE: IEC 60050-811:2017, 811-33-01, modified - “vehicles” has been replaced with “traction unit”.
220 Note 1 to entry has been omitted.]
221 3.1.8
222 coordinated universal time
223 UTC
224 timescale which forms the basis of a coordinated radio dissemination of standard frequencies and time
225 signals, and corresponds exactly in rate with international atomic time, but differs from it by an integral
226 number of seconds
227 Note 1 to entry: Coordinated universal time is established by the International Bureau of Weights and Measures (BIPM)
228 and the International Earth Rotation Services (IERS).
229 Note 2 to entry: The UTC scales is adjusted by the insertion or deletion of seconds, so called positive or negative leap
230 seconds, to ensure approximate agreement with UT1.
231 [SOURCE: IEC 60050-713:1998, 713-05-20]
232 3.1.9
233 current measurement function
234 CMF
235 function of an EMF measuring the current taken from and returned to the CL at the CP
236 3.1.10
237 data collecting system
238 DCS
239 on-ground service collecting the CEBD from an EMS
240 3.1.11
241 data handling system
242 DHS
243 function combining the energy data produced by one or more EMF with other data, storing and transmitting
244 the data to a DCS and other systems
245 3.1.12
246 electric traction power supply system
247 electricity type feed to the traction unit from a CL that it is in contact with, as defined in EN 50163:2004
248 3.1.13
249 enclosure
250 housing affording the type and degree of protection suitable for the intended application
251 [SOURCE: IEC 60050-151:2001, 151-13-08]
252 3.1.14
253 energy calculation function
254 ECF
255 function calculating energy data using input signals from the VMF and CMF
256 3.1.15
257 energy data
258 set of measured energy values transferred from EMF to DHS
———————
As impacted by EN 50163:2004/A1:2007, EN 50163:2004/Corrigendum May 2010, EN 50163:2004/AC:2013,
EN 50163:2004/A2:2020, and EN 50163:2004/A3:2022.
259 3.1.16
260 energy delta value
261 energy consumed and/or regenerated during a time period
262 Note 1 to entry: See Figure 2 for example.
263 3.1.17
264 energy index value
265 total accumulated energy consumption and/or energy regeneration at the end of a time period
266 Note 1 to entry: See Figure 2 for example.
268 Figure 2 — Example of energy index value
269 3.1.18
270 energy measurement function
271 EMF
272 function comprising the voltage measurement function, the current measurement function and the energy
273 calculation function
274 3.1.19
275 energy measurement system
276 EMS
277 system comprising the EMF, DHS and associated communications functions
278 3.1.20
279 energy measurement system ID
280 EMSID
281 single-digit value that, together with the NVR, VKM and EVN, uniquely identifying each CP on the traction
282 unit (default value is 1)
283 3.1.21
284 energy meter,
285 device holding an ECF
286 3.1.22
287 equipment type
288 specific design of device containing one or more functions, produced by one supplier and having similar
289 properties including where applicable metrological properties, the same uniform construction of parts
290 determining these properties and the same functional components
291 Note 1 to entry: Equipment is designated by the manufacturer by one or more groups of letters or numbers, or a
292 combination of letters and numbers. Each equipment type has one designation only.
293 Note 2 to entry: The equipment type is represented by the equipment sample as provided for type test.
294 Note 3 to entry: Functions can be e.g. VMF, CMF, ECF or DHS.
295 3.1.23
296 European Vehicle Number
297 EVN
298 number that consists of 12 digits
299 Note 1 to entry: Further details are set out in Commission Decision (EU) 2018/1614.
300 Note 2 to entry: CIS wagons to be coded according to OSJD-UIC leaflet 402, which allows the conversion from 8 digits
301 to 12 digits and vice versa.
302 3.1.24
303 flag
304 code indicating information relevant to the functioning of the EMS
305 Note 1 to entry: Examples include operational status, etc.
306 3.1.25
307 function,
308 mode of action or activity by which a product fulfils its purpose
309 Note 1 to entry: A function (considered as a black-box) transfers input parameters (material, energy, information) into
310 related output parameters (material, energy, information).
311 [SOURCE: IEC 60050-821:2017, 821-12-25, modified – Note 1 to entry has been added.]
312 3.1.26
313 hybrid train
314 train having electrical traction units but also having an on-board energy source (e.g. diesel or hydrogen)
315 and/or an on-board energy storage (e.g. batteries) able to be used for traction
316 Note 1 to entry: Hybrid trains can have synchronous or asynchronous operation. Asynchronous operation is the use of
317 the onboard storage or current collector. During the train run, either the onboard source/storage is used (diesel,
318 hydrogen and battery), or the electrical energy is coming from the current collector. During synchronous operation, many
319 sources of energy are used simultaneously.
320 3.1.27
321 implementation under assessment
322 IUA
323 specific EMS equipment type used throughout the conformity assessment
324 3.1.28
325 index value overrun
326 return to zero of the index value after reaching the maximum value allowed by the register
327 3.1.29
328 interface,
329 link between two functions of the EMS or between the EMS and other
330 functions
331 Note 1 to entry: A link can be physical or virtual.
332 3.1.30
333 k-factor
334 multiplicand necessary to convert a secondary value into a primary value
335 Note 1 to entry: Each Voltage Measurement Function and/or Current Measurement Function can have a specific k-
336 factor. If the k-factor is applied to Energy Data, this factor is the product of the k-factors of the Voltage Measurement
337 Function and/or Current Measurement Function used.
338 3.1.31
339 National Vehicle Registers code
340 NVR
341 identification code which is assigned to each individual vehicle, in particular traction unit, in country where it
342 is registered, and which consists of valid 2 character country code as defined by the EN ISO 3166-1 alpha-2-
343 codes for representation of countries
344 3.1.32
345 primary value
346 value referred to the measuring inputs of an EMF
347 3.1.33
348 purchaser
349 entity that is a recipient of the EMS or parts of the EMS provided by a supplier
350 3.1.34
351 secondary value
352 value of current, voltage, power or energy which is equal to a primary value when multiplied by a specific k-
353 factor
354 3.1.35
355 sensor
356 < energy measurement system> device performing the VMF or CMF
357 Note 1 to entry: Sensor is used as a general term and encompasses a wide variety of technology / devices for
358 measurement purposes, e.g. inductive transformers, hall-effect devices, capacitive and resistive dividers, resistive
359 shunts, etc.
360 Note 2 to entry: One sensor can perform multiple functions.
361 3.1.36
362 settlement system
363 system capable of receiving CEBD from a DCS intended to use it for billing
364 3.1.37
365 supplier
366 < energy measurement system> entity that supplies EMS or parts of the EMS
367 3.1.38
368 time period
369 period of time for which energy data is produced
370 3.1.39
371 time reference period
372 TRP
373 time period for which CEBD is produced
374 3.1.40
375 traction unit,
376 vehicle or group of vehicles in fixed formation, for which the energy taken
377 from and/or returned to the CL is measured by one or more EMS
378 Note 1 to entry: The prEN 50463 series uses the term ‘traction unit’ to describe the part of a train to which energy
379 metering is applied. The term ‘traction unit’ is considered to be a more suitable term than ‘vehicle’ because the latter term
380 is generally used to describe the smallest part of a train i.e. an individual vehicle.
381 3.1.41
382 train control and monitoring system
383 TCMS
384 set of interrelated objects providing on board control and monitoring of the train
385 3.1.42
386 Vehicle Keeper Marking
387 VKM
388 alphanumeric code, consisting of 2 to 5 letters as defined by the European Railway Agency (ERA) in
389 Commission Decision (EU) 2018/1614
390 Note 1 to entry: This codification is managed in cooperation by ERA and OTIF.
391 3.1.43
392 voltage measurement function
393 VMF
394 function of an EMF measuring the voltage of the CL at the CP
395 3.2 Abbreviations
396 For the purposes of this document, the following abbreviations apply.
AC Alternating Current
CEBD Compiled Energy Billing Data
CEBDID CEBD identification
CL Contact Line
CMF Current Measurement Function
CP Consumption Point
CPID Consumption Point Identification
DC Direct Current
DCS Data Collecting System
DHS Data Handling System
ECF Energy Calculation Function
EMF Energy Measurement Function
EMS Energy Measurement System
EMSID Energy Measurement System ID
EVN European Vehicle Number
IEMF Integrated EMF
IM Infrastructure Manager
IUA Implementation Under Assessment
NVR National Vehicle Registers code
RAMS Reliability, Availability, Maintainability and Safety
RU Railway Undertaking
SuC System under Consideration
TCMS Train Control and Monitoring System
TRP Time Reference Period
UTC Coordinated Universal Time
VKM Vehicle Keeper Marking
VMF Voltage Measurement Function
397 4 Requirements
398 4.1 General
399 Clause 4 of this document describes the requirements of an EMS (generic application, i.e. not yet installed
400 on board) or of a CP (specific application, i.e. installed on a traction unit, e.g. locomotive, consist, trainset).
401 Subclause 4.2 gives system level requirements for the CP.
402 Subclause 4.3 gives common requirements for all devices implementing one or more functions of the EMS.
403 4.2 System level requirements
404 4.2.1 General
405 If an EMS has any functions which are additional to those specified in EN 50463 series, then these functions
406 shall not:
407 • affect the accuracy;
408 • degrade the operation of the EMS; and
409 • influence the production and storage of CEBD and CEBD-related data.
410 Any changes to configuration shall be logged in the EMS, and the device marking and stored information
411 shall also be updated.
412 4.2.2 Accuracy
413 The energy measurement accuracy is defined by the functions of the EMF and shall be determined in
414 accordance with prEN 50463-2:2025.
415 4.2.3 EMS operation and power supply
416 4.2.3.1 General
417 The EMS shall be fully operational whenever energy flows from or to the CL.
418 Any part of the EMS powered by an auxiliary power supply shall be compatible with the requirements of
419 EN 50155:2021 regarding power supply characteristics.
420 The rated power supply voltage and maximum power consumption of the EMS shall be stated.
421 4.2.3.2 Power-up
422 The EMS shall achieve operational status and be ready to measure energy within 60 s after application of
423 power to the EMS.
424 NOTE 1 The application of power to the EMS is an installation design consideration.
425 NOTE 2 The 60 s maximum time limit has been selected because the power-up procedure for traction units typically
426 requires several minutes to elapse between switching on the vehicles ancillary supplies and any significant amount of
427 energy being drawn from the CL.
428 4.2.3.3 Power-down
429 In the event of intentional loss of power to the EMS, no CEBD and other data shall be lost.
430 Unintentional loss of power shall not affect data stored in the EMS.
431 NOTE The EMS could include a procedure for transmitting all unsent CEBD to DCS as part of a planned power-
432 down procedure of the EMS. This can help to support timely data processing on-ground.
433 4.2.4 EMS measuring input
434 4.2.4.1 Installation point of the VMF and CMF
435 The position of the VMF(s) and CMF(s) in the power circuit shall ensure that all active and reactive energy
436 taken from and returned to the CL is measured.
437 NOTE Devices consuming small quantities of energy (e.g. high impedance voltage monitoring/detection devices,
438 insulators, etc.) are not considered significant and their consumption need not be measured by the EMS.
439 4.2.4.2 Characteristics of electric traction power supply system
440 The ratings of the EMS voltage and current measuring inputs shall be selected in accordance with
441 prEN 50463-2:2025 taking into account the intended electric traction power supply system and traction unit
442 rated current.
443 4.2.5 Data handling
444 4.2.5.1 Electric traction power supply system change
445 An EMS (one or multiple) shall cover all electric traction power supply systems that the traction unit can
446 operate on.
447 If an EMS is used for more than one electric traction power supply system, it shall continue to function
448 correctly when changing between systems, and log each change of electric traction power supply system. As
449 600 V and 750 V DC electric traction power supply systems are given the same number 05 as their electric
450 traction power supply system code in prEN 50463-3:2025, Table 5, changes between 600 V and 750 V DC
451 electric traction power supply system do not need to be logged.
452 NOTE 1 This can be achieved directly by the EMS or by input signals from the traction unit.
453 NOTE 2 If voltage detection is used to detect electric traction power supply system change, overvoltages above
454 Umax2, in accordance with EN 50163:2004 and voltage drops below Umin2 could cause a detection of an electric traction
455 power supply system change.
456 The EMS shall measure energy consumption within 1 s of the change to the new electric traction power
457 supply system.
458 4.2.5.2 Consumption Point Identification (CPID)
459 A consumption point is uniquely identified using:
460 — NVR - National Vehicle Register code;
461 — VKM - Vehicle Keeper Marking;
462 — EVN - European Vehicle Number/OTIF Number of one of the vehicles forming the traction unit;
463 — EMSID – energy measurement system ID.
464 When presented as a string, the CPID shall be composed according to the following scheme:
465 [NVR]_[VKM]_[EVN][EMSID]
466 The brackets are for convenience only, the following example illustrates this:
467 D_DB_9180540618421.
468 The rules for assigning the EVN and the EMSID to the CPIDs shall be equal for all the traction units of the
469 same type.
470 The CPID shall be stored in non-volatile memory of the EMS.
471 Security procedures shall be implemented to prevent unauthorized changes to the CPID (see 4.2.8).
472 Reference method between CPID and the IDs (e.g. serial numbers) of the devices that physically implement
473 the EMS shall be provided by the integrator and/or the entity in charge of maintenance to ensure the
474 traceability of the EMS configuration throughout the vehicle life cycle.
475 Access to the EMS shall be limited to the authorized maintenance persons (see 4.2.8).
476 The creation and usage of CPID in EMS (CP) commissioning is illustrated as shown in Figure 3.
478 Figure 3 — CP Commissioning
479 The usage of CPID in EMS (CP) maintenance is illustrated as shown in Figure 4.
481 Figure 4 — CP Maintenance
482 A change of the CPID of an EMS shall be considered as an EMS installed in another consumption point.
483 After transferring all data to ground, the EMS data related to the former CPID shall be deleted, except data
484 needed for the life cycle of the EMS e.g. EMS maintenance related information.
485 NOTE 1 Where the EMS is set up to produce CEBD that includes parallel readings of same type energy values, the
486 energy data will be put in channels in the data transfer of CEBD from EMS to DCS and each channel will be uniquely
487 identified by a ChannelD in the transfer file. See prEN 50463-4:2025 for details.
488 NOTE 2 A traction unit with two or more CPs in the same vehicle has a different EMSID in each CP. A traction unit
489 with multiple vehicles and a CP in different vehicles, each CP can have the same EMSID.
490 NOTE 3 The EMS can carry a fictitious CPID until such time as the EMS is commissioned into commercial use. The
491 process of assigning the correct CPID to a specific EMS needed when bringing it into commercial use is out of the scope
492 of EN 50463 series.
493 4.2.6 Hybrid trains
494 Hybrid trains will run frequently on other energy source (and thus move without energy taken from or
495 returned to CL), charge on-board energy storage (and thus having higher consumption taken from CL) or run
496 on the stored battery energy (and thus also move without energy taken from CL).
497 In order to enable validation of the data coming from the CP measuring the energy taken from or returned to
498 CL (CEBDBlock or ReadingBlock), additional status information of the hybrid system shall be added to the
499 CEBDBlock and/or the ReadingBlock by using the EnergySourceActivated and EnergyFlowToBattery
500 elements (see prEN 50463-4:2025, 4.3.4.2). This information can be provided via CNI (see
501 prEN 50463-4:2025, 4.2.1) or a direct connection via a free voltage contact. Extra measurement points are
502 possible on the generation from an internal energy source and/or charging/discharging of a battery. Such
503 measurements can be added to the ReadingBlock.
504 NOTE In settlement the IM validates the data coming from the CP. When EnergySourceActivated is true, having no
505 or less energy consumed is likely correct. Without this information an IM can estimate electrical consumption for a bi-
506 mode locomotive with no measured consumption while running on an electrified line.
507 4.2.7 RAMS
508 4.2.7.1 Reliability
509 Reliability requirements shall be in accordance with EN 50155:2021, 6.1.1. Reliability figures and calculation
510 methods can be agreed between the supplier and purchaser.
511 4.2.7.2 Availability
512 Calculation methods and availability figures can be agreed between the supplier and purchaser.
513 4.2.7.3 Maintainability
514 Maintainability requirements shall be in accordance with EN 50155:2021, 6.3, 6.3.3 and 6.4.
515 Further requirements, if any, can be agreed between the supplier and purchaser.
516 4.2.7.4 Safety
517 The EMS shall be designed, manufactured and installed on board the traction unit in such a way that it is
518 safe in normal use and under normal conditions, in particular to ensure:
519 • personal safety against electric shock in accordance with EN 50153:2014;
520 • personal safety against effects of excessive temperature in accordance with EN ISO 13732-1:2008, and
521 • protection against spread of fire (guideline can be found in EN 45545-2:2020+A1:2023 and
522 EN 45545-5:2013+A1:2015.
523 NOTE When considering personal safety (electric shock risk), CL failure is a credible failure condition. This can
524 pose a risk if a live part of the CL comes into direct contact with an exposed part of the EMS, or an exposed device
525 connected directly to the EMS (e.g. roof mounted devices containing VMF, CMF or antenna).
526 4.2.8 Cybersecurity
527 Cybersecurity provides protection against unauthorised disclosure, transfer, modification, or destruction of
528 information or information systems, whether accidental or intentional. To achieve this, there are several
529 security standards which apply to the railway environment, for example, CLC/TS 50701, prEN IEC 63452 or
530 EN IEC 62443 series.
531 Due to the ever-evolving communication technology (e.g. communication architecture between EMS and
532 DCS) and new threats to security, this requirement is not static. Hardware and software security measures
533 are continuously being developed and implemented to mitigate the associated threats and risks. The
534 manufacturer shall declare (in the technical data) the cybersecurity measures followed to ensure a secure
535 product.
536 During the EMS integration, installation, operation, and maintenance stages, cybersecurity measures shall
537 be applied and documented.
538 Annex A provides a way of fulfilling these requirements.
539 NOTE National or regional regulations can require specific cybersecurity measures.
540 4.3 Device level requirements
541 4.3.1 Marking and availability of essential data
542 4.3.1.1 Marking
543 Each device of the EMS shall be permanently and clearly marked, internally or externally, with the following
544 information. If the marking is internal it shall be visible from the outside of the device.
545 Marking
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