EN IEC 63341-3:2026

SLOVENSKI STANDARD
oSIST prEN IEC 63341-3:2024
01-maj-2024
Železniške naprave - Sistemi gorivnih celic za vozna sredstva - 3. del: Metode za
preskušanje zmogljivosti elektroenergetskih sistemov z gorivnimi celicami
Railway applications - Fuel cell systems for rolling stock - Part 3: Performance test
methods for fuel cell power systems
Systèmes à pile à combustible pour matériel roulant - Partie 3: Méthodes d’essai des
performances pour système à pile à combustible
Ta slovenski standard je istoveten z: prEN IEC 63341-3:2024
ICS:
27.070 Gorilne celice Fuel cells
45.060.01 Železniška vozila na splošno Railway rolling stock in
general
oSIST prEN IEC 63341-3:2024 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN IEC 63341-3:2024
oSIST prEN IEC 63341-3:2024
105/1031/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 63341-3 ED1
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2024-03-08 2024-05-31
SUPERSEDES DOCUMENTS:
105/963/CD, 105/1007A/CC
IEC TC 105 : FUEL CELL TECHNOLOGIES
SECRETARIAT: SECRETARY:
Germany Mr David Urmann
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:

TC 9
Other TC/SCs are requested to indicate their interest, if any, in
this CDV to the secretary.
FUNCTIONS CONCERNED:
EMC ENVIRONMENT QUALITY ASSURANCE SAFETY
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft for Vote
(CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
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This document is still under study and subject to change. It should not be used for reference purposes.
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(SEE AC/22/2007 OR NEW GUIDANCE DOC).

TITLE:
Railway applications – Hydrogen and fuel cell systems for rolling stock – Part 3: Performance test methods
for fuel cell power system
PROPOSED STABILITY DATE: 2028
NOTE FROM TC/SC OFFICERS:
electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.
You may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose without
permission in writing from IEC.

oSIST prEN IEC 63341-3:2024
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CONTENTS
FOREWORD . 5
INTRODUCTION . 8
1 Scope . 9
2 Normative references . 9
3 Terms, definitions and abbreviated term . 10
3.1 Terms and definition . 10
3.2 Abbreviated term . 16
4 Symbols . 16
5 Test preparation . 20
5.1 General . 20
5.2 Test station setup . 20
5.3 Instruments and measurement methods . 21
5.3.1 General . 21
5.3.2 Measurement instruments . 22
5.3.3 Measurement points . 22
5.3.4 Minimum required measurement systematic uncertainty . 23
5.4 Test conditions . 23
5.4.1 Laboratory conditions . 23
5.4.2 Installation and operating conditions of the system . 24
5.4.3 Quality of hydrogen . 24
5.4.4 Quality of power input . 24
6 Test method . 24
6.1 General . 24
6.2 Operating Tests for Stabilized Operation . 24
6.2.1 General . 24
6.2.2 Test method. 24
6.2.3 Processing of Results . 26
6.3 Operating Test for Dynamic Operation . 29
6.3.1 Start-up and go operational test . 29
6.3.2 power ramp up Test . 32
6.3.3 Power ramp down, go standby and shutdown test . 34
6.4 Polarization Curve test . 38
6.4.1 General . 38
6.4.2 Test Method. 38
6.4.3 Processing of Results . 38
6.5 Load Profile Test . 38
6.5.1 General . 38
6.5.2 Test Method. 39
6.6 Environmental Tests . 39
6.6.1 General . 39
6.6.2 Altitude Test . 40
6.6.3 Power Generation Test at Low and High Temperatures . 40
6.6.4 Power Generation Test under Low and High Humidity Conditions . 42
6.7 Acoustic Noise Emissions . 43
6.8 EMC . 43

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7 Test reports . 43
7.1 General . 43
7.2 Title page . 43
7.3 Table of contents . 44
7.4 Summary report . 44
Annex A . 45
A.1 General . 45
A.2 FCPS without power converter . 45
A.2.1 electrical system configuration 1. 45
A.2.2 electrical system configuration 2. 45
A.2.3 electrical system configuration 3. 46
A.2.4 electrical system configuration 4. 46
A.3 FCPS with power converter . 47
A.3.1 electrical system configuration 1. 47
A.3.2 electrical system configuration 2. 48
Annex B . 49
B.1General . 49
B.2Converting way . 49
Annex C . 50
C.1General . 50
C.2General methodology . 50
C.3FCPS sizing documentation . 50
C.4Operational verification . 51
C.5Test report . 51
Annex D . 52
D.1General . 52
D.2General methodology . 52
D.3Test Method . 55
D.4Test report . 56
Annex E . 57
E.1General . 57
E.2Detailed report . 57
E.3Full report . 57
Bibliography . 58

Figure 1 - Hierarchy of standards related to IEC 63341 . 7
Figure 2 - Example of electric power distribution of FCPS . 11
Figure 3 - The typical flow chart of a fuel cell power system . 13
Figure 4 – Example of a test station setup for FCPS . 21
Figure 5 – Examples of a start-up and go operational test . 30
Figure 6 – Examples of a power ramp up test . 33
Figure 7 – Examples of a power ramp down, go standby and shutdown test . 35
Figure 8 – Example of a load profile cycle . 39
Figure A.1 – electrical system configuration 1 of FCPS without power converter . 45
Figure A.2 – electrical system configuration 2 of FCPS without power converter . 46

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Figure A.3 – electrical system configuration 3 of FCPS without power converter . 46
Figure A.4 – electrical system configuration 4 of FCPS without power converter . 47
Figure A.5 – electrical system configuration 1 of FCPS with power converter . 48
Figure A.6 – electrical system configuration 2 of FCPS with power converter . 48
Figure D.1 – High dynamic standard load profile . 54

Table 1 – Symbols and their meanings . 16
Table 2 – subsystem parameters of the FCPS for recording . 24
Table 3 Polarization Curve test points . 38
Table 4 – Example of a load profile cycle . 38
Table D.1 – High dynamic standard load profile . 52
Table D.2 – Low dynamic standard load profile . 54

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INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
RAILWAY APPLICATIONS –
HYDROGEN AND FUEL CELL SYSTEMS FOR ROLLING STOCK –
Part 3: Performance test methods for fuel cell power system

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide standardisation organisation comprising all
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8) Attention is drawn to the normative references cited in this publication. The use of the referenced publications is
essential for the correct application of this publication.
9) Attention is drawn to the possibility that some elements of this IEC publication may be the subject of patent rights.
The IEC is not responsible for identifying any or all such patent rights.
International Standard IEC 63341-3 has been prepared by IEC Technical Committee 105: Fuel
Cell Technologies and is an International Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
105/XX/FDIS 105/XX/RVD
Full information on the voting for approval of this International Standard can be found in the
voting report indicated in the table above.
The language used in the development of this International Standard is English.
This document has been drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available at
www.iec.ch/members_experts/refdocs. The main types of documents developed by the IEC are
described in more detail at http://www.iec.ch/standardsdev/publications.

oSIST prEN IEC 63341-3:2024
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TC105 decided to start work on generic fuel cell technologies covering different industrial
sectors:
• IEC 62282-2: Fuel Cell Technologies:
o IEC 62282-2-100: Fuel Cell Modules
o IEC 62282-3-100: Stationary fuel cell power systems – Safety
o IEC 62282-4-101: Fuel cell power systems for electrically powered industrial
trucks - Safety
These standards are often generic and do not cover the specific requirements of railway
applications.
The standard IEC 63341: Railway applications – Hydrogen and fuel cell systems for rolling stock
is divided into several parts as described below:
• Part 1: Fuel cell power system
• Part 2: Hydrogen fuel system
• Part 3: Performance tests methods for fuel cell power system
In addition, TC 9 has developed the following standards for subsystems related to or having
interfaces with the fuel cell power system:
• IEC 62864-1:2016, Railway applications – Rolling Stock – Power Supply with onboard
energy storage system – Part: 1 Series hybrid system
• IEC 61287, Railway applications – Power converters installed onboard rolling stock-
Part 1: Characteristics and test methods
• IEC 60349, Electrical traction – rotating electrical machines for rail and road vehicles
• IEC 62928, Railway applications – rolling stock equipment – onboard lithium-ion traction
batteries
The hierarchy of standards is shown in Figure 1.The standards listed in Figure 1 are not exhaustive.

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Figure 1 - Hierarchy of standards related to IEC 63341
The Committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At that time, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
oSIST prEN IEC 63341-3:2024
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1 INTRODUCTION
2 The IEC 63341 series covers categories such as fuel cell power systems, hydrogen fuel systems,
3 and performance test methods for fuel cell power system.
4 This part of IEC 63341 provides consistent and repeatable test methods for the electrical and
5 environmental performance of fuel cell power systems for rolling stock. This document does not
6 prescribe or identify categories of tests and does not set performance targets.
7 Fuel cells used in rolling stock, such as light rail vehicles, trams, streetcars, metros, commuter
8 trains, regional trains, high speed trains, locomotives, etc., are hybrids and therefore operate
9 in several different modes. Similarly, rolling stock operates in different modes. The purpose of
10 this document is to evaluate the fuel cell system in the different combinations of fuel cell modes
11 and rolling stock operating modes.
12 This part of IEC 63341 is expected to be used by manufacturers of fuel cell power systems used
13 for rolling stock and/or those evaluating the performance of their systems.
14 Users of this document may select test items from those described in this document that are
15 appropriate for their purposes. This document is not intended to preclude the use of other
16 methods.
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17 RAILWAY APPLICATIONS –
18 HYDROGEN AND FUEL CELL SYSTEMS FOR ROLLING STOCK –
19 Part 3: Performance tests methods for fuel cell power system
20 1 Scope
21 This document specifies the performance test methods for fuel cell power systems intended for
22 use in electrically propelled rolling stock.
23 The scope of this document is limited to electrically powered rolling stock. Hydrogen rolling
24 stock with an internal combustion engines are not included in the scope.
25 This document applies to hydrogen fuel cell power systems for electrically propelled rolling
26 stock.
27 This document does not apply to reformer-equipped fuel cell power systems.
28 This document does not cover the hydrogen fuel systems that are permanently or separately
29 attached to either the rolling stock or the fuel cell power system. These are covered by IEC
30 63341-2.
31 The basic system overview with the links between the main functions and the links to the
32 external system is shown in Figure 4 of IEC64431-1.
33 All relevant standards are described in IEC 63341-1. Performance targets for fuel cell power
34 systems are agreed between the user and the manufacturer.
35 2 Normative references
36 The following documents are referred to in the text in such a way that some or all of their content
37 constitutes requirements of this document. For dated references, only the edition cited applies.
38 For undated references, the latest edition of the referenced document (including any
39 amendments) applies.
40 IEC 60050-485:2020, International Electrotechnical Vocabulary (IEV) - Part 485: Fuel cell
41 technologies
42 IEC 60050-551:1998, International Electrotechnical Vocabulary - Part 551: Power electronics
43 IEC 60571, Railway applications - Electronic equipment used on rolling stock
44 IEC 61287-1，Railway applications-Power converters installed on board rolling stockPart 1:
45 Characteristics and test methods
46 IEC 62236-3-1, Railway applications - Electromagnetic compatibility-Part 3-1: Rolling stock -
47 Train and complete vehicle
48 IEC 62236-3-2, Railway applications - Electromagnetic compatibility - Part 3-2: Rolling stock –
49 Apparatus
50 IEC 62498-1, Railway applications - Environmental conditions for equipment - Part 1:
51 Equipment on board rolling stock
52 IEC 62928:2017, Railway applications - Rolling stock - Onboard lithium-ion traction batterie
53 IEC 62973-1:2018, Railway applications – Rolling stock – Batteries for auxiliary power supply
54 systems – Part 1: General requirement
55 ISO 3744, Acoustics - Determination of sound power levels and sound energy levels of noise
56 sources using sound pressure - Engineering methods for an essentially free field over a
57 reflecting plane
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58 ISO 3746, Acoustics - Determination of sound power levels and sound energy levels of noise
59 sources using sound pressure - survey method using an enveloping measurement surface over
60 a reflecting plane
61 ISO 9614-1, Acoustics; determination of sound power levels of noise sources using sound
62 intensity; part 1: measurement at discrete points
63 ISO 9614-2, Acoustics; determination of sound power levels of noise sources using sound
64 intensity; part 2: Measurement by scanning
65 3 Terms, definitions and abbreviated term
66 3.1 Terms and definition
67 For the purpose of this document, the following terms and definitions apply.
68 ISO and IEC maintain terminological databases for use in standardization at the following
69 addresses:
70 • ISO Online browsing platform: available at http://www.iso.org/obp
71 • IEC Electropedia: available at http://www.electropedia.org/
73 3.1.1
74 fuel cell power system
75 FCPS
76 generator system that uses one or more fuel cell modules to generate electric power and heat
77 Note 1 to entry: This system typically includes the following subsystems: fuel cell power module, oxidant management
78 system, fuel management system, thermal management system, exhaust management system, electrical and power
79 management system, and their monitoring & control system.
80 [SOURCE: IEC 60050-485:2020, 485-09-01, modified – “fuel cell modules” has been replaced
81 with “fuel cell power modules”; “the note 1 to entry” has been added.]
82 3.1.2
83 fuel cell stack
84 FCS
85 equipment assembly of two or more cells, separators, cooling plates, manifolds and a support
86 structure that electrochemically converts, typically, hydrogen rich gas and air reactants to
87 electrical power, heat and other reactant bi-products
88 [SOURCE: IEC 60050-485:2020, 485-06-01, modified – “equipment”, “two or more”, “bi” have
89 been added; “supporting” has been replaced with “support”; “hydrogen-rich” has been replaced
90 with “hydrogen rich”; “DC” has been replaced with “electrical”; “reaction” has been replaced with
91 “reactant”.]
92 3.1.3
93 fuel cell power module
94 fuel cell module
95 FCPM
96 assembly incorporating one or more fuel cell stacks and other main and, if applicable, additional
97 components, which are intended to be integrated into a power system
98 Note 1 to entry: A fuel cell module can contain the following equipment: its control system and in option, the cell
99 voltage monitoring device, the fuel recirculation device, the humidification device for reactants, sensors, valves and
100 actuators. This subsystem is a part of the fuel cell power system.
101 [SOURCE: IEC 60050-485:2020, 485-09-03, modified – “fuel cell power module” has been
102 added as the preferred term and the term “fuel cell module” has become synonymous; “other
103 main and” has been added; “that” has been replaced with “which”; “or a vehicle” has been
104 removed; “note 1 to entry” has been modified.]

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105 3.1.4
106 oxidant management system
107 OMS
108 system including filtering and pressuring equipments (and in option humidifying equipments),
109 sensors and valves, able to manage the incoming oxidant such as air from the environment (as
110 an example) to supply the FCPM (or fuel cell stack)
111 Note 1 to entry: This subsystem is a part of the fuel cell power system.
112 3.1.5
113 thermal management system
114 TMS
115 thermal loop including pump, heat exchanger, fan, heater, sensors and valves, (and in option
116 ion removal device…) able to manage the temperature of the fuel cell power system and coolant
117 for cooling purpose and heating purpose
118 Note 1 to entry: This subsystem is a part of the fuel cell power system.
119 3.1.6
120 exhaust management system
121 ExMS
122 fluidic circuit able to manage the gas exhaust from the fuel cell power system to the environment
123 Note 1 to entry: This subsystem is a part of the fuel cell power system.
124 3.1.7
125 (electronic) (power) converter
126 an operative unit for electronic power conversion, comprising one or more electronic valve
127 devices, transformers and filters if necessary and auxiliaries if any
128 Note 1 to entry: It can be DC/DC converter (insulated type) or chopper (non insulated type) for FCPS output.
129 [SOURCE: IEC 60050-551:1998, 551-12-01, modified – “note 1 to entry” has been modified.]
130 3.1.8
131 gross power
132 DC outlet power of operational fuel cell stack(s) in the fuel cell power system
133 Note 1 to entry: Error! Reference source not found. shows typical power distribution of a fuel cell power system.
134 This figure applies to definitions 3.1.8 to 3.1.13.
gross
power
Operational Power
Load
FCS(s) converter
Output
power
internally
consumed
Auxiliary
power
Consumption Input
FCPS
power
135 .
136 Figure 2 - Example of electric power distribution of FCPS
137 Note 2 to entry: Power converter in dashed frame is optional. ,A dashed line indicated the loss of power converter is
138 optional and part of the internally consumed power.
139 [SOURCE: IEC 60050-485:2020, 485-14-01, modified – “a fuel cell stack” has been replaced
140 with“total fuel cell stack(s) in the fuel cell power system”; “note 1 to entry” has been modified;
141 “note 2 to entry” has been added.]

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142 3.1.9
143 output power
144 power generated by the fuel cell power system and available for external use
145 Note 1 to entry: Output power=gross Power-internal Consumed Power.
146 3.1.10
147 input power
148 power not internally supplied by the fuel cell power system, needed for the fuel cell power system
149 operation, and consumed by the auxiliaries
150 Note 1 to entry: The consumption of the auxiliaries is partially or all provided by the FCPS input power.
151 3.1.11
152 net power
153 net electric power
154 remaining power generated by the fuel cell power system usable in totality for external use
155 Note 1 to entry: net powe r= output power - input power
156 Note 2 to entry: Correction methods of different electrical system configurations are shown in the annex A.
157 [SOURCE: IEC 60050-485:2020, 485-14-03 for net electric power, modified – “remaining”
158 has been added; “available” has been replaced with “usable and available”; “note 1 to entry”
159 has been modified.]
160 3.1.12
161 auxiliary consumption
162 power consumed by all the fuel cell power system auxiliaries necessary for the fuel cell power
163 system operation, which is the sum of the FCPS input power and the internally consumed power
164 Note 1 to entry: Auxiliary consumption=gross power-output power+input power.
165 3.1.13
166 internally consumed power
167 Power consumed internally by the fuel cell power system auxiliaries
168 Note 1 to entry: Internally consumed power=gross power-output power.
169 Note 2 to entry: Internally consumed power could be 0.
170 3.1.14
171 minimum power
172 minimum output power at which the fuel cell power system is able to operate (for transient
173 operation)
174 Note 1 to entry: If the operation with minimum power is limited in time, the maximum duration shall be specified by
175 the manufacturer.
176 3.1.15
177 idle power
178 minimum output power at which the fuel cell power system can operate continuously in a stable
179 manner
180 Note 1 to entry: Idle Power can be identical or higher than minimum power.
181 3.1.16
182 rated power
183 maximum continuous output power that the fuel cell power system is designed to generate,
184 established for a specific set of operating conditions specified by the manufacturer
185 [SOURCE: IEC 60050-485:2020, 485-14-04, modified – ”electric power output” has been
186 replaced by” output power”; ”achieve under normal” has been replaced by “generate,
187 established for a specific set of”.]

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188 3.1.17
189 maximum power
190 maximum output power at which the fuel cell power system is able to operate (for transient
191 operation)
192 Note 1 to entry: if the operation with maximum power is limited in time, the maximum duration shall be specified.
193 Note 2 to entry: Maximum power can be higher than rated power.
194 3.1.18
195 maximum system efficiency power
196 output power level at which the fuel cell power system is most efficient specified by the
197 manufacturer
198 3.1.19
199 off state
200 state of the fuel cell power system with no power input or output(except for storage state)
201 Note 1 to entry: The presence or not of hydrogen in FMS and air in OMS should be agreed between the manufacturer
202 and the user.
203 Note 2 to entry: Figure 3 show typical state diagram for the FCPS. This figure provides definitions for the different
204 states and phases. This note applies to definition from Error! Reference source not found.9 to 3.1.31.
206 Figure 3 - The typical flow chart of a fuel cell power system

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207 3.1.20
208 cold state
209 state of a fuel cell power system at ambient temperature with no power input or output
210 Note 1 to entry: this is a sub-state of the off state
211 [SOURCE: IEC 60050-485:2020, 485-21-01,modified –”note 1 to entry” has been added.]
212 3.1.21
213 hot state
214 state of the fuel cell power system at normal operating temperature range with no power input
215 or output
216 Note 1 to entry: this is a sub-state of the off state
217 3.1.22
218 cold start
219 start-up when the fuel cell power system is below the operating temperature range (from cold
220 state to standby state)
221 Note 1 to entry: the fuel cell power system can be pre-heated during this phase.
222 [SOURCE: IEC 60050-485:2020, 485-18-02, Modified - “at ambient temperature” has been
223 replace with “below the operating temperature range (from cold state to standby state)”.]
224 3.1.23
225 hot start
226 start-up when the fuel cell power system is within its normal operating temperature range (from
227 hot state to standby state)
228 SOURCE: IEC 60050-485:2020,485-18-03,Modified - "(from hot state to standby state)” has
229 been added.]
230 3.1.24
231 standby state
232 pre-generation state
233 state of the fuel cell power system at a sufficient operating temperature and in such an
234 operational mode, with zero electric power output, that the fuel cell power system is capable of
235 being promptly switched to an operational state with a substantial electric power output
236 [SOURCE: IEC 60050-485, 21-04]
237 3.1.25
238 operational state
239 state of a fuel cell power system with a substantial electrical active power output available
240 [SOURCE: IEC 60050-485, 21-02]
241 3.1.26
242 steady state
243 state of a physical system in which the relevant characteristics remain constant with time
244 Note 1 to entry: For thefuel cell power system, the output power is constant from idle power to rated power
245 [SOURCE:IEC 60050-485:2020, 485-21-50-Modified - “note 1 to entry” has been added.]
246 3.1.27
247 power ramp up
248 Transient phase in operational state to go from idle power to rated power
249 3.1.28
250 power ramp down
251 Transient phase in operational state to go from rated power to idle power

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252 3.1.29
253 shutdown
254 sequence of operations that occurs to transition a fuel cell power system from the operational
255 state to the off state
256 [SOURCE IEC 60050-485:2020, 485-19-01 modified –”the passive state,the pre-generation
257 state, or the cold state” has been replace with “off state”; “ note 1 to entry” has been omitted.]
258 3.1.30
259 Go operational
260 Transient phase from standby state to operational state
261 3.1.31
262 Go standby
263 Transient phase from operational state to standby state
264 3.1.32
265 electric efficiency
266 ratio of the net electric power produced by a fuel cell power system to the total enthalpy flow
267 supplied to the fuel cell power system
268 Note 1 to entry: The lower heating value (LHV) is assumed unless otherwise stated.
269 Note 2 to entry: The total enthalpy flow is equal to lower heating value (LHV) multiply hydrogen consumption.
270 [SOURCE: IEC 60050-485:2020, 485-10-02]
271 3.1.33
272 conditioning
273 preliminary step that is required to properly operate a fuel cell to achieve a desired performance
274 following a protocol specified by the manufacturer
275 Note 1 to entry: The conditioning can include reversible processes, or irreversible processes, or both depending on
276 the cell technology.
277 [SOURCE: IEC 60050-485:2020, 11-08]
278 3.1.34
279 waste water
280 excess water that is removed from the fuel cell power system and that does not constitute part
281 of the thermal recovery system
282 [SOURCE: IEC 60050-485:2020, 09-13]
283 3.1.35
284 polarization curve
285 plot of the output voltage as a function of output current at defined operating condition for FCS ,
286 FCMP or FCPS
287 Note 1 to entry: The polarization curve is plotted in V versus A.
288 Note 2 to entry: If fuel cell power system include the power converter, use the input voltage and current of power
289 converter to plot polarization curve.
290 Note 3 to entry: If fuel cell power system without the power converter, use the output voltage and current of FCPS
291 to plot polarization curve.
292 [SOURCE: IEC 60050-485:2020,15-06, modified – ”current density” has been replace by “output
293 current”; “reaction” has been repalce by “operating”; “note 1 to entry” has been modified; “note
294 2 to entry”and “note 3 to entry” have been added.]
295 3.1.36
296 efficiency curve
297 plot of the system efficiency of the fuel cell power system as a function of net power at defined
298 operating condition
299 Note 1 to entry: The efficiency curve is plotted in % versus kW.

oSIST prEN IEC 63341-3:2024
105/1031/CD – 16 – IEC CDV 63341-3 © IEC 2024
300 3.1.37
301 load profile
302 electric power against time of occurrence to illustrate the variance in a load during a given time
303 interval
304 [SOURCE: IEC 62928: 2017, 3.1.35, modified – “curve representing supplied” has been
305 removed.]
306 3.1.38
307 manufacturer
308 organization which has the technical and commercial responsibility for its scope of supply
309 [SOURCE: IEC 62973-1: 2018, 3.1.13, modified – The note 1 to entry has been omitted]
310 3.1.39
311 user
312 organization which will integrate and/or use the fuel cell power system
313 Note 1 to entry: it can be the end user, the train manufacturer or the system integrator.
314 3.2 Abbreviated term
A/C alternating current
DC direct current
ExMS Exhaust Management System
EMC Electro Magnetic Compatibility
FCPM Fuel Cell Power Module
FCPS Fuel Cell Power System
FCS Fuel Cell Stack
OMS Oxidant Management System
TMS Thermal Management System
315 4 Symbols
316 Table 1 lists the symbols and their meanings used in this part of IEC 63341 to represent the
317 electrical performance in the appropriate units.
318 Table 1 – Symbols and their meanings
Symbols Definition Unit
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𝑃𝑃 average output power kW
𝑜𝑜𝑜𝑜𝑜𝑜
𝐸𝐸 output energy during the test period kJ
𝑜𝑜𝑜𝑜𝑜𝑜
∆𝑡𝑡 test duration s
𝑃𝑃 output power during the test period kW
𝑜𝑜𝑜𝑜𝑜𝑜
oSIST prEN IEC 63341-3:2024
IEC CDV 63341-3 © IEC 2024 – 17 – 105/1031/CDV
𝐼𝐼 output current during the test period A
𝑜𝑜𝑜𝑜𝑜𝑜
𝑈𝑈 output voltage during the test period kV
𝑜𝑜𝑜𝑜𝑜𝑜
FCPS input power for each power supply during the
𝑃𝑃 kW
𝑖𝑖𝑖𝑖
test period
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𝑃𝑃 total average FCPS input power kW
𝚤𝚤𝑖𝑖
input current for each power supply during the test
𝐼𝐼 A
𝑖𝑖𝑖𝑖
period
input voltage for each power supply during the test
𝑈𝑈 kV
𝑖𝑖𝑖𝑖
period
�����
𝑃𝑃 average net power kW
𝑖𝑖𝑛𝑛𝑜𝑜
�
corrected average net powe kW
P
net
����
𝑃𝑃 average auxiliary consumption kW
𝐴𝐴𝐴𝐴
�������
𝑃𝑃
average gross power kW
𝑔𝑔𝑔𝑔𝑜𝑜𝑔𝑔𝑔𝑔
𝐼𝐼 FCS current during the test period A
𝐹𝐹𝐴𝐴𝐹𝐹
𝑈𝑈 FCS voltage during the test period kV
𝐹𝐹𝐴𝐴𝐹𝐹
𝑄𝑄 hydrogen consumption kg
𝐻𝐻
𝑞𝑞
integrated mass flow over the test duration Kg
𝑖𝑖𝑖𝑖𝑖𝑖
𝑞𝑞
mass flow rate of fuel under the test conditions kg/s
𝑖𝑖𝑖𝑖
𝜂𝜂 %
𝐹𝐹𝐴𝐴𝐹𝐹𝐹𝐹 FCPS electric efficiency at FCPS level
𝐿𝐿𝐿𝐿𝐿𝐿 lower heating value of hydrogen kJ/kg
𝐻𝐻
𝑆𝑆 output Voltage fluctuation %
𝑣𝑣
maximum output voltage when FCPS with a specified
𝐿𝐿 kV
𝑖𝑖𝑚𝑚𝑚𝑚
output power in steady state
minimum output voltage when FCPS with a specified output
𝐿𝐿 kV
𝑖𝑖𝑖𝑖𝑖𝑖
power in steady state
𝛥𝛥𝑡𝑡 start-up time s
𝑔𝑔𝑜𝑜
𝑡𝑡 initiation time of start-up s
𝑔𝑔𝑜𝑜
𝑡𝑡 completion time of start-up s
𝑔𝑔𝑏𝑏1
oSIST prEN IEC 63341-3:2024
105/1031/CD – 18 – IEC CDV 63341-3 © IEC 2024
𝛥𝛥𝑡𝑡 go operational time s
𝑔𝑔𝑜𝑜
initiation time of go operational s
𝑡𝑡
load
𝑡𝑡
completion timeof go operational s
𝑜𝑜𝑜𝑜1
𝐿𝐿 fuel energy consumed during start-up time kJ
𝐸𝐸−𝑔𝑔𝑜𝑜
𝑄𝑄 hydrogen consumption during the start-up time kg
𝐻𝐻−𝑔𝑔𝑜𝑜
𝐿𝐿 fuel energy consumed during go operational time kJ
𝐸𝐸−𝑔𝑔𝑜𝑜
𝑄𝑄 hydrog
...