Electrically propelled road vehicles — Electrical specifications and tests for voltage class B systems and components — Part 1: Voltage sub-classes and characteristics

This document applies to voltage class B electric propulsion systems and connected auxiliary electric systems of electrically propelled road vehicles. Additionally, it applies to electric circuits and components in these systems. This document provides specifications of voltage sub-classes related to DC electric circuits. It also provides specifications of characteristics which are relevant for design and operation of systems and components for the voltage sub-classes. This document does not cover electrical safety (see ISO 17409 and the ISO 6469 series).

Véhicules à propulsion electrique — Spécifications et essais electriques pour les systèmes et composants de classe B — Partie 1: Caractéristiques et sous classe de tension

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Status
Published
Publication Date
27-Jan-2021
Current Stage
6060 - International Standard published
Start Date
28-Jan-2021
Completion Date
28-Jan-2021
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INTERNATIONAL ISO
STANDARD 21498-1
First edition
2021-01
Electrically propelled road vehicles —
Electrical specifications and tests
for voltage class B systems and
components —
Part 1:
Voltage sub-classes and characteristics
Véhicules à propulsion electrique — Spécifications et essais
electriques pour les systèmes et composants de classe B —
Partie 1: Caractéristiques et sous classe de tension
Reference number
ISO 21498-1:2021(E)
ISO 2021
---------------------- Page: 1 ----------------------
ISO 21498-1:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 21498-1:2021(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Abbreviated terms .............................................................................................................................................................................................. 3

5 General assumptions for the voltage class B system ....................................................................................................... 3

6 Voltage sub-classes ............................................................................................................................................................................................. 4

7 Characteristics of voltage sub-classes ............................................................................................................................................ 5

7.1 General ........................................................................................................................................................................................................... 5

7.2 Component operating status ....................................................................................................................................................... 5

7.3 Voltage operating ranges ................................................................................................................................................................ 6

7.4 Undervoltage and overvoltage .................................................................................................................................................. 6

7.4.1 General...................................................................................................................................................................................... 6

7.4.2 Overvoltage ...................................................................... ..................................................................................................... 7

7.4.3 Undervoltage ....................................................................................................................................................................... 7

7.5 Allocation of voltage ranges and operating status – Overview ..................................................................... 7

7.6 Voltage transients and ripple...................................................................................................................................................... 9

7.6.1 General...................................................................................................................................................................................... 9

7.6.2 Voltage slope ...................................................................... .................................................................................................. 9

7.6.3 Load dump ............................................................................................................................................................................ 9

7.6.4 Voltage ripple ...................................................................................................................................................................10

Annex A (informative) Example for voltage ranges per voltage sub-class .................................................................11

Bibliography .............................................................................................................................................................................................................................12

© ISO 2021 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 21498-1:2021(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/ patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the meaning of ISO specific terms and expressions related to conformity

assessment, as well as information about ISO's adherence to the World Trade Organization (WTO)

principles in the Technical Barriers to Trade (TBT), see www .iso .org/ iso/ foreword .html.

This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 37,

Electrically propelled vehicles.

This first edition cancels and replaces ISO/PAS 19295:2016, which has been technically revised.

The main changes compared to the previous edition are as follows:
— a normative reference clause has been added,
— the terms and definitions clause has been revised,
— a requirement has been added to the component operating status (see 7.2),
— a requirement has been added to load dump (see 7.6.3),
— Figures 4-7 and Table 3 were removed.
A list of all parts in the ISO 21498 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2021 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 21498-1:2021(E)
Introduction

The requirements for voltage class B electric circuits that are used for electric power transfer for

the propulsion of electric road vehicles and their characteristics are significantly different to those

of voltage class A electric circuits. Moreover, the range of voltage class B is too wide to be used for a

component design regarding to voltage.

The ISO 21498 series divides voltage class B in a set of voltage sub-classes to enable a component design

for each voltage sub-class regarding to voltage. It provides appropriate descriptions and definitions for

requirements and characteristics of voltage class B systems for electrically propelled vehicles.

The voltage sub-class itself and the component characteristics have a large cost impact on the component

design and on the overall design of the electric system. Additionally, a high variety of different voltage

sub-classes and operating conditions impedes the use of an existing component in different vehicle

models. The standardisation of voltage sub-classes and characteristics and the reduction of varieties

will enable the reduction of component and system costs. This allows the decoupling of the system or

component designs of a voltage class B electric circuit from the design of the electric energy source.

Finally, the exchange of components from different suppliers for different customers is facilitated.

This document provides definitions of and for voltage sub-classes and characteristics for rechargeable

energy storage systems (RESS) and electric propulsion systems. It defines specific values for these sub-

classes based on maximum working voltage. Voltage sub-classes listed in this document are used for

voltage class B systems of all kinds of current or future electrically propelled road vehicles.

ISO 21498-2 provides electrical tests for electric and electronic components at voltage class B used for

electrically propelled road vehicles. All relevant characteristics are covered considering usual driving

scenarios as well as deviations from normal operation. The descriptions are generalized and include

purpose, setup, procedure and requirements for the tests.

The specifications in this document are not intended to restrict the development of component

performance or technology. The given definition of sub-classes does not exclude the use of other

maximum operating voltages for an individual system design.
© ISO 2021 – All rights reserved v
---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 21498-1:2021(E)
Electrically propelled road vehicles — Electrical
specifications and tests for voltage class B systems and
components —
Part 1:
Voltage sub-classes and characteristics
1 Scope

This document applies to voltage class B electric propulsion systems and connected auxiliary

electric systems of electrically propelled road vehicles. Additionally, it applies to electric circuits and

components in these systems.

This document provides specifications of voltage sub-classes related to DC electric circuits. It also

provides specifications of characteristics which are relevant for design and operation of systems and

components for the voltage sub-classes.

This document does not cover electrical safety (see ISO 17409 and the ISO 6469 series).

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the cited edition applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO/TR 8713, Electrically propelled road vehicles — Vocabulary
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO/TR 8713 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
component operating status

general functional behaviour of components which depend directly on the voltage in voltage class B

(3.13) electric circuits (3.3)
3.2
customer
party that is interested in using voltage class B (3.13) components or systems
3.3
electric circuit

entire set of interconnected electric/electronic parts through which electrical current is designed to

flow under normal operating conditions
© ISO 2021 – All rights reserved 1
---------------------- Page: 6 ----------------------
ISO 21498-1:2021(E)
3.4
lower voltage limit

minimum voltage of a voltage class B (3.13) sub-class disregarding transients (3.10) and ripple (3.8)

3.5
maximum working voltage

highest value of AC voltage (rms) or of DC voltage that can occur under any normal operating conditions

according to the customer’s (3.2) specifications, disregarding transients (3.10) and ripple (3.8)

3.6
power network

all components within voltage class B (3.13) DC network including their connections

3.7
rechargeable energy storage system
RESS

rechargeable system that stores energy for delivery of electric energy for the electric drive

EXAMPLE Batteries, capacitors, flywheel.
3.8
ripple

set of unwanted periodic deviations with respect to the average value of the measured or supplied

quantity, occurring at frequencies which can be related to that of components within a system

3.9
supplier
party that provides voltage class B (3.13) components or systems
3.10
transient

phenomenon or quantity which varies between two consecutive steady states during a short time

interval compared to the timescale of interest
3.11
upper voltage limit

maximum voltage of a voltage class B (3.13) sub-class disregarding transients (3.10) and ripple (3.8)

Note 1 to entry: Maximum working voltages (3.5) within a voltage sub-class (3.15) are less than or equal to the

upper voltage limit.
3.12
voltage class A

classification of an electric component or circuit with a maximum working voltage (3.5) of ≤ 30 V AC

(rms) or ≤ 60 V DC respectively
3.13
voltage class B

classification of an electric component or circuit with a maximum working voltage (3.5) of (> 30 and

≤ 1 000) V AC (rms) or (> 60 and ≤ 1 500) V DC respectively
3.14
voltage range

general term covering voltage sub-class (3.15), working voltages (3.16) and deviations from working

voltages
3.15
voltage sub-class

classification of an electric component or circuit with a DC voltage within the voltage class B (3.13)

2 © ISO
...

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 21498-1
ISO/TC 22/SC 37
Electrically propelled road vehicles —
Secretariat: DIN
Electrical specifications and tests
Voting begins on:
2020-10-13 for voltage class B systems and
components —
Voting terminates on:
2020-12-08
Part 1:
Voltage sub-classes and characteristics
Véhicules à propulsion electrique — Spécifications et essais
electriques pour les systèmes et composants de classe B —
Partie 1: Caractéristiques et sous classe de tension
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 SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 21498-1:2020(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. ISO 2020
---------------------- Page: 1 ----------------------
ISO/FDIS 21498-1:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/FDIS 21498-1:2020(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Abbreviated terms .............................................................................................................................................................................................. 3

5 General assumptions for the voltage class B system ....................................................................................................... 3

6 Voltage sub-classes ............................................................................................................................................................................................. 4

7 Characteristics of voltage sub-classes ............................................................................................................................................ 5

7.1 General ........................................................................................................................................................................................................... 5

7.2 Component operating status ....................................................................................................................................................... 5

7.3 Voltage operating ranges ................................................................................................................................................................ 6

7.4 Undervoltage and overvoltage .................................................................................................................................................. 6

7.4.1 General...................................................................................................................................................................................... 6

7.4.2 Overvoltage ...................................................................... ..................................................................................................... 7

7.4.3 Undervoltage ....................................................................................................................................................................... 7

7.5 Allocation of voltage ranges and operating status – Overview ..................................................................... 7

7.6 Voltage transients and ripple...................................................................................................................................................... 9

7.6.1 General...................................................................................................................................................................................... 9

7.6.2 Voltage slope ...................................................................... .................................................................................................. 9

7.6.3 Load dump ............................................................................................................................................................................ 9

7.6.4 Voltage ripple ...................................................................................................................................................................10

Annex A (informative) Example for voltage ranges per voltage sub-class .................................................................11

Bibliography .............................................................................................................................................................................................................................12

© ISO 2020 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO/FDIS 21498-1:2020(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/ patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the meaning of ISO specific terms and expressions related to conformity

assessment, as well as information about ISO's adherence to the World Trade Organization (WTO)

principles in the Technical Barriers to Trade (TBT), see www .iso .org/ iso/ foreword .html.

This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 37,

Electrically propelled vehicles.

This first edition cancels and replaces ISO/PAS 19295:2016 in whole, which has been technically

revised.
A list of all parts in the ISO 21498 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2020 – All rights reserved
---------------------- Page: 4 ----------------------
ISO/FDIS 21498-1:2020(E)
Introduction

The requirements for voltage class B electric circuits that are used for electric power transfer for

the propulsion of electric road vehicles and their characteristics are significantly different to those

of voltage class A electric circuits. Moreover, the range of voltage class B is too wide to be used for a

component design regarding to voltage.

The ISO 21498 series divides voltage class B in a set of voltage sub-classes to enable a component design

for each voltage sub-class regarding to voltage. It provides appropriate descriptions and definitions for

requirements and characteristics of voltage class B systems for electrically propelled vehicles.

The voltage sub-class itself and the component characteristics have a large cost impact on the component

design and on the overall design of the electric system. Additionally, a high variety of different voltage

sub-classes and operating conditions impedes the use of an existing component in different vehicle

models. The standardisation of voltage sub-classes and characteristics and the reduction of varieties

will enable the reduction of component and system costs. This allows the decoupling of the system or

component designs of a voltage class B electric circuit from the design of the electric energy source.

Finally, the exchange of components from different suppliers for different customers is facilitated.

This document provides definitions of and for voltage sub-classes and characteristics for rechargeable

energy storage systems (RESS) and electric propulsion systems. It defines specific values for these sub-

classes based on maximum working voltage. Voltage sub-classes listed in this document are used for

voltage class B systems of all kinds of current or future electrically propelled road vehicles.

ISO 21498-2 provides electrical tests for electric and electronic components at voltage class B used for

electrically propelled road vehicles. All relevant characteristics are covered considering usual driving

scenarios as well as deviations from normal operation. The descriptions are generalized and include

purpose, setup, procedure and requirements for the tests.

The specifications in this document are not intended to restrict the development of component

performance or technology. The given definition of sub-classes does not exclude the use of other

maximum operating voltages for an individual system design.
© ISO 2020 – All rights reserved v
---------------------- Page: 5 ----------------------
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 21498-1:2020(E)
Electrically propelled road vehicles — Electrical
specifications and tests for voltage class B systems and
components —
Part 1:
Voltage sub-classes and characteristics
1 Scope

This document applies to voltage class B electric propulsion systems and connected auxiliary

electric systems of electrically propelled road vehicles. Additionally, it applies to electric circuits and

components in these systems.

This document provides specifications of voltage sub-classes related to DC electric circuits. It also

provides specifications of characteristics which are relevant for design and operation of systems and

components for the voltage sub-classes.

This document does not cover electrical safety (see ISO 17409 and the ISO 6469 series).

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the cited edition applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO/TR 8713, Electrically propelled road vehicles — Vocabulary
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO/TR 8713 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
component operating status

general functional behaviour of components which depend directly on the voltage in voltage class B

(3.13) electric circuits (3.3)
3.2
customer
party that is interested in using voltage class B (3.13) components or systems
3.3
electric circuit

entire set of interconnected electric/electronic parts through which electrical current is designed to

flow under normal operating conditions
© ISO 2020 – All rights reserved 1
---------------------- Page: 6 ----------------------
ISO/FDIS 21498-1:2020(E)
3.4
lower voltage limit

minimum voltage of a voltage class B (3.13) sub-class disregarding transients (3.10) and ripple (3.8)

3.5
maximum working voltage

highest value of AC voltage (rms) or of DC voltage that can occur under any normal operating conditions

according to the customer’s (3.2) specifications, disregarding transients (3.10) and ripple (3.8)

3.6
power network

all components within voltage class B (3.13) DC network including their connections

3.7
rechargeable energy storage system
RESS

rechargeable system that stores energy for delivery of electric energy for the electric drive.

EXAMPLE Batteries, capacitors, flywheel.
3.8
ripple

set of unwanted periodic deviations with respect to the average value of the measured or supplied

quantity, occurring at frequencies which can be related to that of components within a system

3.9
supplier
party that provides voltage class B (3.13) components or systems
3.10
transient

phenomenon or quantity which varies between two consecutive steady states during a short time

interval compared to the timescale of interest
3.11
upper voltage limit

maximum voltage of a voltage class B (3.13) sub-class disregarding transients (3.10) and ripple (3.8)

Note 1 to entry: Maximum working voltages (3.5) within a voltage sub-class (3.15) are less than or equal to the

upper voltage limit.
3.12
voltage class A

classification of an electric component or circuit with a maximum working voltage (3.5) of ≤ 30 V AC

(rms) or ≤ 60 V DC respectively
3.13
voltage class B

classification of an electric component or circuit with a maximum working voltage (3.5) of (> 30 and

≤ 1 000) V AC (rms) or (> 60 and ≤ 1 500) V DC respectively
3.14
voltage range

general term covering voltage sub-class (3.15), working voltages (3.16) and deviations from working

voltages
3.15
voltage sub-
...

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