oSIST prEN 50388-1:2026

Fixed installations and rolling stock for railway applications - Technical criteria for the coordination between electric traction power supply systems and rolling stock to achieve interoperability - Part 1: General

This document establishes requirements for the electrical aspects to achieve technical compatibility between rolling stock and electric traction systems, limited to:
-   co-ordination of protection principles between power supply and traction units, i.e. separation sections, train set current or power limitation, short circuit current discrimination, circuit breaker coordination and use of regenerative braking;
-   co-ordination of installed power on the line and the power demand of trains, i.e. traction unit power factor, train set current or power limitation, electric system performance, type and characterization;
-   compatibility assessment relating to harmonics and dynamic effects.
Informative values are given for some parts of the existing European railway networks, in annexes.
NOTE   For those railways within the scope of EU Interoperability Directive, definitive values are set out in the register of infrastructure published in accordance with Article 49 of Directive (EU) 2016/797, and the list of items included in the register is described in the commission decision (EU) 2019/777.
The following electric traction systems are within the scope of this document:
-   railways;
-   guided mass transport systems that are integrated with railways;
-   material transport systems that are integrated with railways.
Information is given on electrification parameters to enable train operating companies to confirm, after consultation with the rolling stock manufacturers, that risks of non-compatibility are minimized and that there will be no consequential disturbance on the electrification system.
The interaction between pantograph and overhead contact line is dealt with in EN 50367:2020.
The interaction with the control-command and signalling subsystem is not dealt with in this document.
Basic considerations have been included concerning the use of traction units with onboard electric traction energy storage in the electric traction power system. Details of this are dealt with in CLC/TS 50729:2025.

Ortsfeste Anlagen und Fahrzeuge für Bahnanwendungen - Technische Kriterien für die Koordination zwischen elektrische Bahnenergieversorgungssysteme und Fahrzeugen zum Erreichen der Interoperabilität - Teil 1: Allgemeines

Installations fixes et matériel roulant pour applications ferroviaires - Critères techniques pour la coordination entre les installations fixes de traction électrique et le matériel roulant pour réaliser l'interopérabilité - Partie 1 : Généralités

Le présent document définit les exigences relatives aux critères électriques visant à garantir la compatibilité technique entre les réseaux de traction électrique et le matériel roulant, qui se limitent à :
-   la coordination des mesures de protection entre l'alimentation électrique et les unités motrices, et plus particulièrement les sections de séparation, la limitation du courant fixé ou de la puissance d train, la discrimination des défauts lors des court-circuits, la coordination des disjoncteurs et l'utilisation du freinage par récupération ;
-   la coordination entre la puissance installée d'une ligne et la demande en énergie des trains, et plus particulièrement le facteur de puissance d’une unité motrice, la limitation du courant fixé ou de la puissance du train, la performance, le type et les caractéristiques du système électrique ;
-   l'évaluation de compatibilité relative aux harmoniques et aux effets dynamiques.
Les valeurs informatives fournies en annexe concernent certaines parties des réseaux ferroviaires européens.
NOTE   Pour les réseaux ferroviaires relevant de la directive européenne sur l'interopérabilité, des valeurs définitives sont indiquées dans le registre de l'infrastructure publié conformément à l'Article 49 de la Directive (UE) 2016/797. La liste des éléments inclus dans ce registre est décrite dans la décision de la Commission (UE) 2019/777.
Les réseaux de traction électrique suivants relèvent du domaine d'application du présent document :
-   les réseaux ferroviaires ;
-   les réseaux de transport en commun guidés intégrés aux réseaux ferroviaires ;
-   les réseaux de transport de matériaux intégrés aux réseaux ferroviaires.
Le présent document fournit des informations relatives aux paramètres d'électrification pour permettre aux exploitants ferroviaires de confirmer, après consultation des constructeurs de matériel roulant, que les risques de non-compatibilité sont réduits au maximum et que le système d'électrification ne fera pas l'objet de perturbations consécutives.
L'interaction entre le pantographe et la ligne aérienne de contact est traitée dans l’EN 50367:2020.
L'interaction avec le sous-système de contrôle-commande et signalisation n'est pas traitée dans la présente norme.
Des considérations fondamentales concernant l'utilisation d'unités motrices avec stockage d'énergie de traction électrique embarqué dans le réseau d'alimentation électrique de traction ont été incluses. Ce sujet est traité plus en détail dans le CLC/TS 50729:2025.

Fiksni postroji in tirna vozila za železniške naprave - Tehnični kriteriji za uskladitev med napajalnimi viri in tirnimi vozili za doseganje interoperabilnosti - 1. del: Splošno

Ta dokument določa zahteve za električne vidike, da se doseže tehnična združljivost med železniškimi vozili in električnimi vlečnimi sistemi, omejeno na:
- usklajevanje zaščitnih načel med napajalnim sistemom in vlečnimi enotami, tj. ločilni odseki, omejitev toka ali moči vlakovne kompozicije, diskriminacija kratkostičnega toka, usklajevanje odklopnikov in uporaba regenerativnega zaviranja;
- usklajevanje nameščene moči na progi in povpraševanja po moči vlakov, tj. faktor moči vlečne enote, omejitev toka ali moči vlakovne kompozicije, zmogljivost električnega sistema, tip in karakterizacija;
- ocena združljivosti v zvezi s harmoniki in dinamičnimi učinki.
V prilogah so podane informativne vrednosti za nekatere dele obstoječih evropskih železniških omrežij.
OPOMBA Za tiste železnice, ki so v okviru Direktive o interoperabilnosti EU, so dokončne vrednosti določene v registru infrastrukture, objavljenem v skladu s členom 49 Direktive (EU) 2016/797, seznam postavk, vključenih v register, pa je opisan v sklepni odločbi komisije (EU) 2019/777.
Naslednji električni vlečni sistemi so zajeti v obseg tega dokumenta:
- železnice;
- vodeni sistemi masovnega prevoza, ki so integrirani z železnicami;
- sistemi za transport materiala, ki so integrirani z železnicami.
Podane so informacije o parametrih elektrifikacije, da lahko podjetja za železniški promet po posvetovanju s proizvajalci železniških vozil potrdijo, da so tveganja nezdružljivosti zmanjšana in da ne bo prišlo do posledičnih motenj v sistemu elektrifikacije.
Interakcija med pantografom in nadzemnim kontaktnim vodom je obravnavana v EN 50367:2020.
Interakcija s podsistemom za nadzor, vodenje in signalizacijo ni obravnavana v tem dokumentu.
Vključene so osnovne obravnave glede uporabe vlečnih enot z vgrajenim shranjevanjem električne vlečne energije v sistemu električne vlečne moči. Podrobnosti o tem so obravnavane v CLC/TS 50729:2025.

General Information

• Status: Not Published
• Public Enquiry End Date: 21-Jun-2026
• ICS: 29.280 - Electric traction equipment
• ICS: 45.060.01 - Railway rolling stock in general
• Technical Committee: ŽEN - Electrical applications for railways
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 14-Apr-2026
• Due Date: 01-Sep-2026
• Directive: Harmonized Standard2016/797/EU - Directive (EU) 2016/797 of the European Parliament and of the Council of 11 May 2016 on the interoperability of the rail system within the European Union (Text with EEA relevance)
• Mandate: M/591 - Standardisation request to the European Committee for Standardisation and the European Committee for Electrotechnical Standardisation as regards railway products in support of Directive (EU) 2016/797
• Ref Project: prEN 50388-1:2026 - Fixed installations and rolling stock for railway applications - Technical criteria for the coordination between electric traction power supply systems and rolling stock to achieve interoperability - Part 1: General

Relations

• Revises: SIST EN 50388-1:2022 - Railway Applications - Fixed installations and rolling stock - Technical criteria for the coordination between electric traction power supply systems and rolling stock to achieve interoperability - Part 1: General
• Effective Date: 22-Jul-2025

Standards Content (Sample)

SLOVENSKI STANDARD
01-junij-2026
Fiksni postroji in tirna vozila za železniške naprave - Tehnični kriteriji za uskladitev
med napajalnimi viri in tirnimi vozili za doseganje interoperabilnosti - 1. del:
Splošno
Fixed installations and rolling stock for railway applications - Technical criteria for the
coordination between electric traction power supply systems and rolling stock to achieve
interoperability - Part 1: General
Ortsfeste Anlagen und Fahrzeuge für Bahnanwendungen - Technische Kriterien für die
Koordination zwischen elektrische Bahnenergieversorgungssysteme und Fahrzeugen
zum Erreichen der Interoperabilität - Teil 1: Allgemeines
Installations fixes et matériel roulant pour applications ferroviaires - Critères techniques
pour la coordination entre les installations fixes de traction électrique et le matériel
roulant pour réaliser l'interopérabilité - Partie 1 : Généralités
Ta slovenski standard je istoveten z: prEN 50388-1:2026
ICS:
29.280 Električna vlečna oprema Electric traction equipment
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.

EUROPEAN STANDARD DRAFT
prEN 50388-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2026
ICS 29.280; 45.060.01 Will supersede EN 50388-1:2022
English Version
Fixed installations and rolling stock for railway applications -
Technical criteria for the coordination between electric traction
power supply systems and rolling stock to achieve
interoperability - Part 1: General
Installations fixes et matériel roulant pour Applications Ortsfeste Anlagen und Fahrzeuge für Bahnanwendungen -
ferroviaires - Critères techniques pour la coordination entre Technische Kriterien für die Koordination zwischen
les installations fixes de traction électrique et le matériel elektrische Bahnenergieversorgungssysteme und
roulant pour réaliser l'interopérabilité - Partie 1: Généralités Fahrzeugen zum Erreichen der Interoperabilität - Teil 1:
Allgemeines
This draft European Standard is submitted to CENELEC members for enquiry.
Deadline for CENELEC: 2026-06-26.

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
© 2026 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Project: 82356 Ref. No. prEN 50388-1:2026 E

1 Contents Page
2 European foreword . 5
3 1 Scope . 7
4 2 Normative references . 7
5 3 Terms, definitions and abbreviations . 7
6 3.1 Terms and definitions . 7
7 3.2 Term clarification, coherence and translation . 11
8 3.3 Abbreviations and symbols . 12
9 4 Periods over which parameters should be averaged or integrated - reference time . 12
10 5 Separation sections . 12
11 5.1 General . 12
12 5.2 System separation sections . 13
13 5.3 Phase separation sections . 13
14 5.4 Acceptance criteria . 13
15 6 Power factor of a traction unit . 13
16 6.1 General requirements . 13
17 6.2 Particular conditions . 14
18 6.2.1 Traction . 14
19 6.2.2 Regenerative braking . 15
20 6.2.3 Standstill or coasting . 15
21 6.2.4 De-icing of contact line. 15
22 6.3 Acceptance criteria . 15
23 7 Train set current and power limitation function . 15
24 7.1 General . 15
25 7.2 Current limitation in accordance with infrastructure information. 15
26 7.3 Automatic current or power limitation as a function of line voltage . 16
27 7.4 Automatic power limitation as a function of frequency variation. 16
28 7.5 Acceptance criteria . 18
29 8 Electric traction power supply system performance . 18
30 8.1 Dimensioning study . 18
31 8.1.1 General . 18
32 8.1.2 Traffic conditions . 18
33 8.1.3 Parameters relating to the rolling stock and train sets . 18
34 8.1.4 Parameters relating to infrastructure . 19
35 8.2 Workflow . 19
36 8.3 Voltage limits . 20
37 8.4 Acceptance criteria . 21
38 9 Type and characterization of electric traction power supply system . 21
39 9.1 Type of electric traction power supply system . 21
40 9.2 Characterization of electric traction power supply system . 21
41 10 Harmonic and dynamic effects . 22
42 10.1 General . 22
43 10.2 Common codes of practice . 22
44 10.3 Compatibility study . 22
45 10.4 Acceptance criteria . 23
46 11 Coordination of protection . 23
47 11.1 General . 23
48 11.2 Short-circuit current levels and its clearance . 23
49 11.3 Closing or auto-reclosing of circuit breakers . 24
50 11.4 Maximum inrush current of AC traction unit . 26
51 11.5 DC electrification systems, transient current during closure . 26
52 11.6 Acceptance criteria . 26
53 12 Regenerative braking . 26
54 12.1 General considerations on regenerative braking to the contact line . 26
55 12.2 General conditions and requirements on the use of regenerative braking . 27
56 12.2.1 Traction unit . 27
57 12.2.2 Power supply system conditions . 27
58 12.3 Acceptance criteria . 28
59 13 Effects of DC operation on AC systems . 28
60 14 Tests . 28
61 15 Test methodology . 29
62 15.1 Separation sections . 29
63 15.1.1 Tests for traction unit . 29
64 15.1.2 Tests for infrastructure . 29
65 15.2 Power factor . 29
66 15.2.1 Tests for traction unit . 29
67 15.3 Train set current and power limitation . 29
68 15.3.1 Current or power limitation function of the train set as a function of register of
69 infrastructure information and function of line voltage - Tests for traction unit . 29
70 15.3.2 Power limitation as a function of line frequency - Tests for traction unit . 29
71 15.4 Requirements for performance of power supply - Tests for infrastructure . 30
72 15.5 Coordination of protection. 30
73 15.5.1 Short circuit current levels and its clearance . 30
74 15.5.2 Closing or auto-reclosing of circuit breakers. 30
75 15.5.3 Maximum inrush current of AC traction unit - Tests for traction unit . 30
76 15.5.4 DC traction units; transient current during closure - Tests for traction unit . 31
77 15.6 Regenerative braking . 31
78 15.6.1 Tests for traction unit . 31
79 15.6.2 Tests for Substation . 31
80 Annex A (informative) Integration periods over which parameters can be averaged . 32
81 A.1 General . 32
82 A.2 Reference time period over which values can be averaged or integrated . 32
83 Annex B (informative) Description, calculation and use of mean useful voltage . 33
84 B.1 General . 33
85 B.2 Description and methodology . 33
86 B.3 Selection criteria determining the voltage U at the pantograph . 34
pantograph
87 B.4 Values for Minimum Mean Useful Voltage at the pantograph . 35
88 B.5 Relation between U and U . 36
mean useful min1
89 B.6 Acceptance criteria . 36
90 B.7 Testing . 36
91 Annex C (informative) Sign convention of active and reactive power . 38
92 C.1 Sign convention . 38
93 C.2 description of power factor requirements . 40
94 Annex D (informative) Maximum allowable train set current . 42
95 Annex E (informative) Power limitation as a function of line frequency - 15 kV 16,7 Hz systems
96 . 44
97 Annex F (informative) Maximum traction current and power of a train set against voltage . 45
98 Annex G (informative) Use of regenerative braking . 47
99 Annex H (informative) Data related to the compatibility study of harmonics and dynamic effects
100 . 48
101 H.1 Characterization of the electric traction system installations . 48
102 H.2 Characterization of the trains . 52
103 Annex I (informative) Compatibility study . 54
104 Annex J (informative) Information to I t values for earthing conductors onboard rolling stock 58
105 J.1 General . 58
106 J.2 AC . 58
107 J.2.1 General. 58
108 J.2.2 AC 16,7 Hz . 59
109 J.2.3 AC 50 Hz . 59
110 J.3 DC . 59
111 Annex K (normative) Special national conditions . 61
112 Bibliography . 62
114 European foreword
115 This document (prEN 50388-1:2026) has been prepared by CLC/SC 9XC, “Electric supply and earthing
116 systems for public transport equipment and ancillary apparatus (Fixed installations)”, of Technical Committee
117 CLC/TC 9X, “Electrical and electronic applications for railways”. It also concerns the expertise of CLC/SC 9XB,
118 “Electromechanical material on board of rolling stock”.
119 This document is currently submitted to the Enquiry.
120 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)
121 This document will supersede EN 50388-1:2022 and all of its amendments and corrigenda (if any).
122 prEN 50388-1:2026 includes the following significant technical changes with respect to EN 50388-1:2022:
123 — Clause 1: clarification concerning traction units with onboard electric traction energy storage;
124 — Clause 2: reference to part 2 of this standard;
125 — Clause 3: clarification on reference to IEV (IEC 60050-811:2017);
126 — Clause 5: better description of the interface between infrastructure and electric trainsets with energy
127 storage, and simplified requirements for passing through system separation sections;
128 — Clause 6: improved precision on the value of displacement power factor and associated conditions;
129 — Clause 7: minor improvements;
130 — Clause 8: minor editorial changes, and information concerning electric trainsets with energy storage;
131 — Clause 10: editorial change due to publication of part 2 of this standard;
132 — Clause 11: new Table 7 giving value of I t which is used for the interface with rolling stock (thermal design
133 of return path of vehicle when short circuit current), minor modification of the sequence of tripping of circuit
134 breakers taking into account the presence of line testing. Improved precision of on-board maximum AC
135 inrush current;
136 — Clause 15: improved precision of tests for maximum inrush current, and traction unit tests;
137 — Annex B: Change of verbs to the correct form;
138 — Annex C: Improvement of Figure C1;
139 — Annex F: Correction of errors;
140 — Annex H: Corrections of values concerning 2x15 kV 16,7 Hz, specifically the length of route and
141 resonance frequency in 15 kV and 2x15 kV 16,7 Hz (Table H1);
142 — Annex J: Modification of UK SNC.
143 This version includes technical changes, clarifications without technical changes and best practices coming
144 from the use of the last version of the document.
145 This document has been prepared under a standardization request addressed to CENELEC by the European
146 Commission. The Standing Committee of the EFTA States subsequently approves these requests for its
147 Member States.
148 An additional part 2 is published. In relation to assessment of harmonics and dynamic effects, this document
149 (Part 1) sets out the generic process in Clause 10, and the part 2 of this standard gives details and acceptance
150 criteria related to known stability, harmonic phenomena and technologies.
151 EN 50388 “Fixed installations and rolling stock for railway applications- Technical criteria for the coordination
152 between traction power supply and rolling stock to achieve interoperability” consists of the following parts:
153 — EN 50388-1, General
154 — EN 50388-2, Stability and harmonics
155 1 Scope
156 This document establishes requirements for the electrical aspects to achieve technical compatibility between
157 rolling stock and electric traction systems, limited to:
158 — co-ordination of protection principles between power supply and traction units, i.e. separation sections,
159 train set current or power limitation, short circuit current discrimination, circuit breaker coordination and
160 use of regenerative braking;
161 — co-ordination of installed power on the line and the power demand of trains, i.e. traction unit power factor,
162 train set current or power limitation, electric system performance, type and characterization;
163 — compatibility assessment relating to harmonics and dynamic effects.
164 Informative values are given for some parts of the existing European railway networks, in annexes.
165 NOTE For those railways within the scope of EU Interoperability Directive, definitive values are set out in the register
166 of infrastructure published in accordance with Article 49 of Directive (EU) 2016/797, and the list of items included in the
167 register is described in the commission decision (EU) 2019/777.
168 The following electric traction systems are within the scope of this document:
169 — railways;
170 — guided mass transport systems that are integrated with railways;
171 — material transport systems that are integrated with railways.
172 Information is given on electrification parameters to enable train operating companies to confirm, after
173 consultation with the rolling stock manufacturers, that risks of non-compatibility are minimized and that there
174 will be no consequential disturbance on the electrification system.
175 The interaction between pantograph and overhead contact line is dealt with in EN 50367:2020.
176 The interaction with the control-command and signalling subsystem is not dealt with in this document.
177 Basic considerations have been included concerning the use of traction units with onboard electric traction
178 energy storage in the electric traction power system. Details of this are dealt with in CLC/TS 50729:2025.
179 2 Normative references
180 The following documents are referred to in the text in such a way that some or all of their content constitutes
181 requirements of this document. For dated references, only the edition cited applies. For undated references,
182 the latest edition of the referenced document (including any amendments) applies.
183 EN 50163:2004, Railway applications - Supply voltages of traction systems
184 3 Terms, definitions and abbreviations
185 3.1 Terms and definitions
186 For the purposes of this document, the following terms and definitions apply.
187 ISO and IEC maintain terminological databases for use in standardization at the following addresses:
188 — ISO Online browsing platform: available at https://www.iso.org/obp
189 — IEC Electropedia: available at https://www.electropedia.org/

As impacted by EN 50163:2004/Corrigendum May 2010, EN 50163:2004/A1:2007,
EN 50163:2004/AC:2013, EN 50163:2004/A2:2020 and EN 50163:2004/A3:2022.
190 3.1.1
191 contact line
192 conductor system for supplying electric energy to vehicles through current-collecting equipment
193 [SOURCE: IEC 60050-811:2017, 811-33-01, modified - The Note 1 to entry has been removed.]
194 3.1.2
195 overhead contact line
196 contact line placed above the upper limit of the vehicle gauge and supplying vehicles with electric energy
197 through pantographs
198 [SOURCE: IEC 60050-811:2017, 811-33-02, modified - “Catenary” has been removed as synonym, “or beside”
199 has been removed, “roof mounted current collection equipment” has been replaced by “pantographs“.]
200 3.1.3
201 infrastructure manager
202 any body or undertaking that is responsible in particular for establishing and maintaining railway infrastructure
203 Note 1 to entry: This can also include the management of infrastructure control and safety systems. The functions of
204 the infrastructure manager on a network or part of a network may be allocated to different bodies or undertakings.
205 [SOURCE: Directive 2012/34/EU Article 3 (2) modified - only referring to part of the infrastructure.]
206 3.1.4
207 new element
208 new, rebuilt or modified traction-unit or power supply component (hardware or software) having a possible
209 influence on the harmonic or dynamic behaviour of the power supply system
210 Note 1 to entry: This new element can be integrated in an existing power supply network with traction units e.g. for fixed
211 installation:
212 — transformer;
213 — HV cable;
214 — filters;
215 — converter.
216 Note 2 to entry: Depot areas are a combination of equipment listed in the Note 1 to entry associated with a large number
217 of traction units and therefore very prone to harmonic and dynamic effects.
218 Note 3 to entry: New means also the introduction of an existing element on another infrastructure system: i.e. “new to this
219 infrastructure”.
220 Note 4 to entry: This concept is addressed further in part 2 of this document.
221 3.1.5
222 normal operating conditions
223 conditions pertaining when traffic is operating to the design timetable and train formation used for power supply
224 fixed installation design
225 Note 1 to entry: Power supply equipment is operated in accordance with the system specification which is defined by the
226 infrastructure manager’s policy.
227 [SOURCE: EN 50163:2004, 3.16, modified – “traffic operating” has been replaced by “Conditions pertaining
228 when traffic is operating “, last sentence has been removed and the Note 1 to entry has been modified.]
229 3.1.6
230 displacement power factor cos φ
231 ratio of the active power of the fundamental component P to the apparent power of the fundamental
232 component S1 under periodic conditions
active power of the fundamental
233 cosϕ=
apparent power of the fundamental
234 Note 1 to entry: In this document, only the fundamental component is considered
235 3.1.7
236 register of infrastructure
237 register stating the values of the network
238 parameters of each subsystem or part of subsystem concerned, as set out in the relevant TSI
239 Note 1 to entry: The parameters are given for each section of line and those relevant to the electric traction system are set
240 out in the Energy subsystem entry.
241 Note 2 to entry: The register of infrastructure is published in accordance with Article 49 of Directive (EU) 2016/797, and
242 the list of items included in the register is described in the commission decision (EU) 2019/777.
243 [SOURCE: derived from Article 49 of Directive (EU) 2016/797]
244 3.1.8
245 rolling stock
246 all vehicles with or without motors
247 Note 1 to entry: Examples of vehicles include a locomotive, a coach and a wagon.
248 Note 2 to entry: Preferred German translation “Bahnfahrzeuge”, French translation “Matériel roulant”, other translations
249 given in IEV.
250 [SOURCE: IEC 60050-811:2017, 811-02-01, modified – The Note 2 to entry has been added.]
251 3.1.9
252 separation section
253 section of a contact line provided with a sectioning point at each end to prevent successive electrical sections,
254 differing in voltage amplitude, phase or frequency being connected together by the passage of current
255 collectors
256 Note 1 to entry: In other standards, IEV, EN 50367, the term “neutral” replaces “separation”.
257 [SOURCE: IEC 60050-811:2017, 811-36-16, modified – The term ‘neutral’ has been replaced by ‘separation’,
258 and in the definition ‘amplitude’ has been added and Note 1 to entry has been added.]
259 3.1.10
260 substation
261 installation, the main function of which is to supply a contact line system, at which the voltage of a
262 primary supply system, and in certain cases the frequency, is converted to the voltage and frequency of the
263 contact line
264 [SOURCE: IEC 60050-811:2017, 811-36-02, modified – The specific use “in electric traction” and the synonym
265 “substation” have been removed. The definition has been modified and the Note 1 to entry has been removed.]
266 3.1.11
267 traction unit
268 TU
269 locomotive, motor coach or train-unit
270 Note 1 to entry: German translation “Triebfahrzeugeinheit”, French translation “Unité motrice”, other translations given
271 in IEV.
272 Note 2 to entry: In this document, a traction unit specifically comprises all traction subsystems including auxiliary
273 supplies, which can be collectively switched off by one current collector / pantograph.
274 [SOURCE: IEC 60050-811:2017, 811-02-04, modified – the Notes 1 and 2 to entry have been added.]
275 3.1.12
276 train set
277 combination of vehicles coupled together, including banking locomotives
278 [SOURCE: IEC 60050-811:2017, 811-01-08, modified – In the term ‘set’ has been added after ‘train’, in the
279 definition ‘rolling stock’ has been replaced by ‘vehicles and banking locomotives’. The existing Note 1 to Entry
280 has been replaced with a new Note 1 to Entry]
281 Note 1 to entry: German translation “Zugverband”, French translation “Train (composition)”.
282 3.1.13
283 maximum power at wheel
284 highest power derived from tractive effort vs speed diagram calculated for any type of train set
285 3.1.14
286 electric traction power supply system
287 railway electric distribution network used to provide energy for rolling stock
288 Note 1 to entry: The system includes:
289 — contact line systems;
290 — return circuit of electric traction systems;
291 — running rails of non-electric traction systems, which are in the vicinity of, and conductively connected to, the running
292 rails of an electric traction system;
293 — electric installations, which are supplied from contact lines either directly or via a transformer;
294 — electric installations in power plants and substations, which are utilized solely for generation and distribution of power
295 directly to the contact line;
296 — electric installations of switching stations.
297 [SOURCE: IEC 60050-811:2017, 811-36-21], modified – “power supply” has been added in the term
298 3.1.15
299 vehicle
300 single item of rolling stock, e.g. a locomotive, a coach or a wagon
301 Note 1 to entry: German translation “Fahrzeug”, French translation “Véhicule”.
302 3.1.16
303 short-circuit current
304 I
ss
305 prospective sustained current resulting from a short circuit due to a fault or an incorrect connection in an electric
306 circuit
307 Note 1 to entry: The term I relates to the short circuit performance characteristics for DC switchgear.
ss
308 [SOURCE: EN 50123-1:2003, 3.2.12], modified – Note 1 to entry has been added
309 3.1.17
310 cut-off current
311 I
cut-off
312 maximum instantaneous value of current attained during the breaking operation of a switching device
313 [SOURCE: EN 50123-1:2003, 3.2.14], modified – “(I )” has been added in the term
cut-off
314 3.1.18
315 inrush current
316 transient current associated with energising of transformers, cables, reactors, etc
317 [SOURCE: IEC 60050-448:1995, 448-11-30]
318 3.2 Term clarification, coherence and translation
319 Due to inconsistency of definitions in the bibliography, the following statement in Table 1, Figure 1, Figure 2
320 and following text should be considered.
321 Table 1 — Term coherence and translation
Subclause English term German term French term
3.1.15 Vehicle Fahrzeug Véhicule
3.1.8 Rolling stock Bahnfahrzeuge Matériel roulant
3.1.12 Train set Zugverband Train (composition)
3.1.11 Traction unit (TU) Triebfahrzeugeinheit Unité motrice
For information Train (train path) Zug (Zugfahrt) Train (circulation)
For information (motor) Train-unit Triebzug Automotrice
323 Key
324 solid grey motor vehicles
325 white unpowered vehicles
326 NOTE in the case of an EMU, motored axles are typically distributed throughout vehicles.
327 Figure 1 — Term clarification for Traction unit (TU) and Train set
329 Figure 2 — Term clarification for Train (train path)
330 NOTE A unit is a piece of rolling stock which is subject to the application of a TSI, and subject to ’EC’ verification. It
331 can be composed of several vehicles, as defined in Directive (EU) 2016/797, Article 2(3); considering the scope of a TSI,
332 the use of the term “vehicle” in a TSI is limited to the rolling stock subsystem.
333 3.3 Abbreviations and symbols
334 For the purposes of this document, the following abbreviations apply.
EC European Commission
EU European Union
ETCS European train control system
HV high voltage
LRAS load reference-arrow system
RMS root mean square
RINF register of infrastructure
TSI technical specification for interoperability
Umax2 highest non-permanent voltage defined in EN 50163:2004, 3.5
U highest permanent voltage defined in EN 50163:2004, 3.4
max1
Un nominal voltage defined in EN 50163:2004, 3.3
U lowest permanent voltage defined in EN 50163:2004, 3.7
min1
Umin2 lowest non-permanent voltage defined in EN 50163:2004, 3.8
v velocity
335 Other terms in the document are defined at the point of use within this document.
336 4 Periods over which parameters should be averaged or integrated - reference
337 time
338 Where train operators or infrastructure managers use various parameters for their dimensioning computations,
339 protection measures and planning, these are effective only if they are averaged over precisely defined time
340 spans. Guidance and recommendations on these time spans are given in Annex A (informative).
341 5 Separation sections
342 5.1 General
343 Separation sections shall allow train sets to move from one overhead contact line section to another without
344 them being bridged by the pantograph(s). Train sets shall be designed to accommodate this.
345 NOTE 1 EN 50367:2020 describes the mechanical design of separation sections with allowed section lengths and
346 pantograph distances and connections.
347 Train sets shall pass a separation section by use of one of the following operational principles of train set
348 action:
349 1) No action required, i.e. pantograph(s) may remain raised and on-board circuit breaker may remain closed.
350 NOTE 2 No train set action can be used for sectioning points.
351 2) With pantograph(s) raised and touching the contact wire(s), but with traction power exchange to the
352 contact line brought to zero before entering the separation section.
353 NOTE 3 This solution to bring traction power exchange to zero is faster than opening the on-board circuit breaker
354 and is in many cases sufficient as auxiliary and no-load current from components can be negligible to create an arc.
355 The on-board circuit breaker can however be opened depending on train set design e.g. in order not to exceed
356 permissible voltage limits.
357 3) With pantograph(s) raised and touching the contact wire(s) and on-board circuit breaker opened before
358 entering the separation section.
359 4) With pantograph(s) lowered before entering the separation section and not touching the contact wire(s).
360 Power exchange to the contact line shall be brought to zero before lowering the pantograph(s).
361 For lines with speed:
362 — v ≥ 250 [km/h] train set action shall be done automatically;
363 — v < 250 [km/h] train set action should be done automatically, otherwise it shall be done manually by
364 intervention of the driver.
365 The choice of principle of train set action for each separation section shall be made by the infrastructure
366 manager(s) and shall be set out in the register of infrastructure. The train set’s driver shall be informed about
367 the minimum necessary manual action by adequate means (e.g. visual signs along the track or on-board)
368 sufficiently before entering the separation section.
369 NOTE 4 There might be other types of overhead contact line sections requiring train set actions, e.g. de-energised
370 sections due to insufficient insulation distance or sections where overhead contact line is not installed for use of train sets
371 with on-board energy storage. Such solutions are dealt with in CLC/TS 50729, and the requirements for separation sections
372 are applied as far as reasonable to facilitate interoperability.
373 5.2 System separation sections
374 System separation sections separate different types of electric traction power supply systems.
375 Train set action (automatic or manual, for train sets designed for several power supply systems) additionally
376 include choosing correct pantograph and electric circuits for the actual type of electric traction power supply
377 system.
378 System separation sections shall have provisions to avoid damage caused by the bridging of the adjacent
379 systems if the train set action fails.
380 5.3 Phase separation sections
381 Phase separation sections separate feeding sections with different voltage amplitude or phase within the same
382 type of electric traction power supply system.
383 If train set action is required, the principle of passing with raised pantograph(s) is preferred. This depends
384 mainly on the distribution of pantographs on the train set. The principle of lowering the pantograph(s) may be
385 used under particular circumstances.
386 Other designs of phase separation sections that allow train sets to pass a sectioning point whilst taking power
387 from the contact line (e.g. automatically switched sections or “change over sections”), are subject to future
388 development. In this case, reliability and compatibility parameters shall be agreed between the parties involved.
389 5.4 Acceptance criteria
390 Traction units shall be designed in accordance with the requirements as given in 5.1.
391 The power supply system shall achieve the requirements as given in 5.1, 5.2 and 5.3.
392 6 Power factor of a traction unit
393 6.1 General requirements
394 The total power factor of a traction unit influences the power supply system performance, i.e. voltage profile,
395 power feeding (active and reactive) and transfer capacity, energy losses, system stability and reliability of
396 protection relays.
397 Where a train set comprises multiple traction units, if the requirements of each single traction unit in respect
398 of total power factor are fulfilled, then they are considered to be fulfilled for the train set.
399 The displacement factor is measured at the pantograph.
400 The total power factor is composed of the following two elements:
401 — The displacement power factor; and
402 — The total harmonic distortion caused by load current or source current harmonics.
403 No requirement on total harmonic distortion is given in this document.
404 NOTE 1 Requirements on overvoltages caused by harmonics are given in Clause 10 and in the EN 50388-2.
405 More specifically the requirements below do not apply to traction units in AC systems in short term conditions
406 (e.g. < 2 s) and transformer inrush.
407 NOTE 2 Infrastructure managers can impose economic conditions and/or operational restrictions or power limiting
408 conditions to existing traction units not fulfilling the requirements of Clause 6.
409 The requirements apply only to traction units and therefore do not apply to separate loads such as carriages
410 and wagons which are supplied by traction units.
411 NOTE 3 For carriages/wagons, see CLC/TS 50535:2010, 6.1.
412 NOTE 4 Informative Annex C gives only sign convention on active and reactive power.
413 In the ideal situation the displacement power factor of a traction unit is 1. In practice, the following tolerances
414 are accepted for each traction unit:
415 — A reactive power (inductive or capacitive) of up to 3 % of the maximum power at wheel (defined at nominal
416 voltage Un) shall be allowed e.g. taking into account control accuracy at low power and all passive
417 components within the traction unit (e.g. filters, cables). This applies, whatever the operating mode
418 (traction, regenerative, standstill) and whatever the active power is.
419 — For reactive power above 3 %, the displacement power factor shall be ≥ 0,95 (capacitive or inductive) in
420 traction mode (see also quadrant I and IV of Figure C.2) and shall be ≥ 0,95 (inductive) in regenerative
421 mode (see also quadrant II of Figure C.2). This requirement takes into account the improved control
422 accuracy at high power.
423 NOTE 5 This implies that during regenerative braking, capacitive displacement power factor with reactive power
424 above 3 % is not acce
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