SIST EN IEC 61851-25:2021

SLOVENSKI STANDARD
01-marec-2021
Sistem kabelskega napajanja električnih vozil - 23-2. del: Oprema za enosmerno
napajanje EV, kjer varnost zagotavlja električno ločevanje
Electric vehicle conductive charging system - Part 23-2: DC EV supply equipment where
protection relies on electrical separation
Ta slovenski standard je istoveten z: EN IEC 61851-25:2021
ICS:
43.120 Električna cestna vozila Electric road vehicles
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 61851-25

NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2021
ICS 43.120
English Version
Electric vehicle conductive charging system - Part 25: DC EV
supply equipment where protection relies on electrical separation
(IEC 61851-25:2020)
Systeme de charge par conduction pour vehicules Konduktive Ladesysteme für Elektrofahrzeuge - Teil 25:
electriques - Partie 25: Système d'alimentation en courant Gleichstromversorgungseinrichtungen für Elektrofahrzeuge
continu pour véhicules électriques dont la protection bei denen der Schutz von der elektrischen Trennung
s'appuie sur la séparation électrique abhängt
(IEC 61851-25:2020) (IEC 61851-25:2020)
This European Standard was approved by CENELEC on 2021-01-08. 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.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists 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,
Turkey and the United Kingdom.

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
© 2021 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61851-25:2021 E

European foreword
The text of document 69/735/FDIS, future edition 1 of IEC 61851-25, prepared by IEC/TC 69
"Electrical power/energy transfer systems for electrically propelled road vehicles and industrial trucks"
was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN IEC 61851-
25:2021.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2021-10-08
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2024-01-08
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Endorsement notice
The text of the International Standard IEC 61851-25:2020 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards
indicated:
IEC 61851-21-1 NOTE Harmonized as EN 61851-21-1
IEC 61851-23 NOTE Harmonized as EN 61851-23
IEC 61851-24:2014 NOTE Harmonized as EN 61851-24:2014 (not modified)
ISO 18246:2015 NOTE Harmonized as EN ISO 18246:2017 (not modified)
Annex ZA
(normative)
Normative references to international publications with their
corresponding European publications
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 edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cenelec.eu.
Annex ZA of EN IEC 61851-1:2019 is applicable except as follows:
Add the following references:
Publication Year Title EN/HD Year
IEC 60068-2-30 2005 Environmental testing - Part 2-30: Tests EN 60068-2-30 2005
- Test Db: Damp heat, cyclic (12 h + 12
h cycle)
IEC 61140 2016 Protection against electric shock - EN 61140 2016
Common aspects for installation and
equipment
IEC 61180 2016 High-voltage test techniques for low- EN 61180 2016
voltage equipment - Definitions, test and
procedure requirements, test equipment
IEC 61439-7 2018 Low-voltage switchgear and controlgear - -
assemblies - Part 7: Assemblies for
specific applications such as marinas,
camping sites, market squares, electric
vehicle charging stations
IEC 61851-1 2017 Electric vehicle conductive charging EN IEC 61851-1 2019
system - Part 1: General requirements
IEC 62477-1 2012 Safety requirements for power EN 62477-1 2012
electronic converter systems and
equipment - Part 1: General
- - + A11 2014
- - + A12 2021
IEC 62893-4-1 2020 Charging cables for electric vehicles of - -
rated voltages up to and including 0,6/1
kV - Part 4-1: Cables for DC charging
according to mode 4 of IEC 61851-1 -
DC charging without use of a thermal
management system
Publication Year Title EN/HD Year
ISO 3297 2017 Information and documentation - - -
International standard serial number
(ISSN)
ISO 11898-1 2015 Road vehicles - Controller area network - -
(CAN) - Part 1: Data link layer and
physical signalling
ISO 11898-2 2016 Road vehicles - Controller area network - -
(CAN) - Part 2: High-speed medium
access unit
IEC 61851-25 ®
Edition 1.0 2020-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electric vehicle conductive charging system –

Part 25: DC EV supply equipment where protection relies on electrical

separation
Systeme de charge par conduction pour vehicules electriques –

Partie 25: Système d'alimentation en courant continu pour véhicules électriques

dont la protection s'appuie sur la séparation électrique

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 43.120 ISBN 978-2-8322-9122-1

– 2 – IEC 61851-25:2020 © IEC 2020
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 8
3 Terms and definitions . 8
4 General requirements . 10
5 Classification . 11
6 Charging modes and functions . 11
7 Communications . 17
8 Protection against electric shock . 18
9 Conductive electrical interface requirements. 19
10 Requirements for adaptors . 20
11 Cable assembly requirements . 20
12 EV supply equipment constructional requirements and tests . 21
13 Overload and short-circuit protection . 26
14 Automatic reclosing of protective devices . 27
15 Emergency switching or disconnect (optional) . 27
16 Marking and instructions . 27
Annex AA (normative)  Interface between DC EV supply equipment and EV . 29
Annex BB (normative) Level, timing and tolerance of DC output current and DC output
voltage . 32
Annex CC (normative) Description of test equipment, test reporting and test
environment . 38
Annex DD (normative) Compliance tests . 42
Annex EE (normative) Energy transfer process and communication . 51
Annex FF (normative) Digital communication for control of energy transfer . 57
Bibliography . 65

Figure 1 – Measuring network for touch current evaluation weighted for perception or
reaction . 24
Figure 2 – Example of warning label . 28
Figure AA.1 – Interface circuit for energy transfer control showing isolation barriers . 31
Figure BB.1 – Step response for constant value control . 33
Figure BB.2 – Example of DC output current flow controlled by the DC EV supply
equipment and the corresponding terminal voltage using a simple battery model . 35
Figure BB.3 – Example of current limiting followed by voltage limiting for resistive load . 36
Figure CC.1 – Example of test circuit for DUT using a computer and external EV
simulation circuit . 38
Figure CC.2 – Example of test load . 39
Figure CC.3 – Operation points . 41
Figure EE.1 − State transition diagram of charging process . 53
Figure EE.2 – Sequence diagram of energy transfer . 54
Figure FF.1 – Transmission cycle . 57

IEC 61851-25:2020 © IEC 2020 – 3 –
Table 1 – Normal shutdown events and conditions . 16
Table 2 – Error shutdown events and conditions . 16
Table AA.1 – Voltage of control pilot circuit . 29
Table AA.2 – Parameter values for interface circuit . 31
Table BB.1 – Requirements for the output response performance of DC EV supply
equipment . 34
Table BB.2 – Current ripple limit of DC EV supply equipment. 37
Table DD.1 – Correspondence between requirements and test descriptions . 42
Table DD.2 – Initial switch and parameter values for a normal start-up sequence . 43
Table DD.3 – The test value for control pilot circuit . 46
Table DD.4 – Shutdown requirements . 49
Table EE.1– Energy transfer state of DC EV supply equipment . 51
Table FF.1 – Physical/data link layer specification . 57
Table FF.2 – Received parameters during energy transfer (1 of 3) . 59
Table FF.3 – Transmitted parameters during DC charging (1 of 2) . 62

– 4 – IEC 61851-25:2020 © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRIC VEHICLE CONDUCTIVE CHARGING SYSTEM –

Part 25: DC EV supply equipment where protection
relies on electrical separation

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61851-25 has been prepared by IEC technical committee 69:
Electrical power/energy transfer systems for electrically propelled road vehicles and industrial
trucks.
The text of this International Standard is based on the following documents:
FDIS Report on voting
69/735/FDIS 69/740/RVD
Full information on the voting for the approval of this International Standard can be found in the
report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
This document is to be read in conjunction with IEC 61851-1:2017.

IEC 61851-25:2020 © IEC 2020 – 5 –
This document supplements or modifies clauses in IEC 61851-1:2017. Where the text of
subsequent clauses indicates an "addition" to or a "replacement" of the relevant requirement,
test specification or explanation of IEC 61851-1:2017, these changes are made to the relevant
text of IEC 61851-1:2017, which then becomes part of this document. Where no change is
necessary, the words "Clause X of IEC 61851-1:2017 is applicable" are used. Additional
clauses, tables and figures which are not included in IEC 61851-1:2017 have a number starting
from 101. Additional annexes are lettered AA, BB, etc.
A list of all parts in the IEC 61851 series, published under the general title Electric vehicle
conductive charging system, can be found on the IEC website.
In this document, the following print types are used:
– test specifications: italic type.
– notes: smaller roman type.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
– 6 – IEC 61851-25:2020 © IEC 2020
INTRODUCTION
This document describes the specific requirements for DC EV supply equipment whose
secondary circuit and EV are protected from the primary power supply circuit by electrical
separation as defined in IEC 61140, where the connection to the separated circuit is limited to
a single connection.
IEC 61851-25:2020 © IEC 2020 – 7 –
ELECTRIC VEHICLE CONDUCTIVE CHARGING SYSTEM –

Part 25: DC EV supply equipment where protection
relies on electrical separation

1 Scope
This document applies to the DC EV supply equipment for charging electric road vehicles with
a rated supply voltage of up to 480 V AC or up to 600 V DC, with rated output voltage not
exceeding 120 V DC and output currents not exceeding 100 A DC.
This document provides the requirements for the DC EV supply equipment where the secondary
circuit is protected from the primary circuit by electrical separation.
Requirements for bi-directional power flow are not covered in this document.
This document also provides the requirements for the control and the communication between
DC EV supply equipment and an EV.
This document also applies to DC EV supply equipment supplied from on-site storage systems.
The aspects covered in this document include:
• characteristics and operating conditions of the DC EV supply equipment;
• specification of the connection between the DC EV supply equipment and the EV;
• requirements for electrical safety for the DC EV supply equipment.
Additional requirements can apply to equipment designed for specific environments or
conditions, for example:
• DC EV supply equipment located in hazardous areas where flammable gas or vapour and/or
combustible materials, fuels or other combustible, or explosive materials are present;
• DC EV supply equipment designed to be installed at an altitude of more than 2 000 m;
• DC EV supply equipment intended to be used on-board ships.
Requirements for electrical devices and components used in DC EV supply equipment are not
included in this document and are covered by their specific product standards.
This document does not apply to:
• safety aspects related to maintenance;
• charging of trolley buses, rail vehicles, industrial trucks and vehicles designed primarily for
use off-road;
• equipment on the EV;
• EMC requirements for equipment on the EV while connected, which are covered in
IEC 61851-21-1;
• charging the RESS off-board the EV.
NOTE In the following countries electrical separation can only be handled by skilled people: CH

– 8 – IEC 61851-25:2020 © IEC 2020
2 Normative references
Clause 2 of IEC 61851-1:2017 is applicable with the following additions.
IEC 60068-2-30:2005, Environmental testing – Part 2-30: Tests – Test Db: Damp heat, cyclic
(12 h + 12 h cycle)
IEC 61140:2016, Protection against electric shock – Common aspects for installations and
equipment
IEC 61180:2016, High-voltage test techniques for low-voltage equipment – Definitions, test and
procedure requirements, test equipment
IEC 61439-7:2018, Low-voltage switchgear and controlgear assemblies –Part 7: Assemblies
for specific applications such as marinas, camping sites, market squares, electric vehicle
charging stations
IEC 61851-1:2017, Electric vehicle conductive charging system – Part 1: General
requirements
IEC 62477-1:2012, Safety requirements for power electronic converter systems and equipment
– Part 1: General
IEC 62893-4-1:2020, Charging cables for electric vehicles of rated voltages up to and including
0,6/1 kV – Part 4-1: Cables for DC charging according to mode 4 of IEC 61851-1 – DC charging
without use of a thermal management system
ISO 3297:2017, Information and documentation – International standard serial number (ISSN)
ISO 11898-1:2015, Road vehicles – Controller area network (CAN) – Part 1: Data link layer and
physical signalling
ISO 11898-2:2016, Road vehicles – Controller area network (CAN) – Part 2: High-speed
medium access unit
3 Terms and definitions
Clause 3 of IEC 61851-1:2017 is applicable with the following additions to 3.2, 3.3 and 3.7.
ISO and IEC maintain terminological data bases 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/
3.2 Insulation
3.2.101
electrical separation
protective measure in which hazardous-live-parts are insulated from all other electric circuits
and parts, from local earth and from touch
[SOURCE: IEC 60050-826:2004, 826-12-27]

IEC 61851-25:2020 © IEC 2020 – 9 –
3.3 Functions
3.3.101
normal start-up sequence
beginning of an energy transfer sequence with the commands and parameters that are used to
transfer energy to an EV when no error condition arises during the energy transfer sequence
3.3.102
normal shutdown
termination of the energy transfer process initiated by the user, by the EV or by the DC EV
supply equipment, and not caused by a failure
3.3.103
error shutdown
termination of the energy transfer process caused by a failure detected by the DC EV supply
equipment or the EV
3.3.104
emergency shutdown
termination of the energy transfer process caused by a failure detected by the DC EV supply
equipment or the EV that may present a safety hazard
3.3.105
control pilot wire
insulated wire incorporated in a cable assembly which is part of the control pilot circuit
3.3.106
digital communication
digitally encoded information exchanged between DC EV supply equipment and an EV, as well
as the method by which it is exchanged
[SOURCE: IEC 61851-24:2014, 3.1, modified – The term "charging station" has been replaced
with "supply equipment".]
3.3.107
signal
data element that is communicated between DC EV supply equipment and an EV using any
means other than digital communication
[SOURCE: IEC 61851-24:2014, 3.2, modified – The term "charging station" has been replaced
with "supply equipment".]
3.3.108
device under test
DUT
sample of DC EV supply equipment that is submitted for testing
3.7 General terms
3.7.101
available DC output power
maximum DC output power that the DC EV supply equipment can supply
3.7.102
available DC output power parameter
parameter transmitted to the EV indicating the available DC output power

– 10 – IEC 61851-25:2020 © IEC 2020
3.7.103
DC output current
DC current supplied to the EV by the DC EV supply equipment
3.7.104
available DC output current
value of the highest DC current that the DC EV supply equipment can supply to the EV at a
given time
3.7.105
available DC output current parameter
parameter sent by the EV supply equipment to the vehicle that indicates the highest current
that can be supplied to the EV
3.7.106
rated DC output current
output current assigned to the DC EV supply equipment by the manufacturer under normal
operating conditions
3.7.107
requested DC output current
value of the DC output current that is requested by the EV
3.7.108
requested DC output current parameter
parameter sent by the EV to the DC EV supply equipment indicating the requested DC output
current
3.7.109
DC output voltage
voltage present between the DC+ and DC− terminals at the vehicle connector
3.7.110
rated DC output voltage
output voltage assigned to the DC EV supply equipment by the manufacturer
3.7.111
rated DC output voltage parameter
parameter sent by the DC EV supply equipment to indicate the rated DC output voltage
3.7.112
DC output voltage target parameter
value sent by the EV to the DC EV supply equipment that indicates the requested value of the
DC output voltage
3.7.113
DC output voltage limit parameter
value sent by the EV to the DC EV supply equipment that indicates the allowable DC output
voltage
4 General requirements
Clause 4 of IEC 61851-1:2017 is applicable.

IEC 61851-25:2020 © IEC 2020 – 11 –
5 Classification
Clause 5 of IEC 61851-1:2017 is applicable, except as follows.
5.1.2 Characteristics of power supply output
Replacement:
The EV supply equipment shall be classified as DC EV supply equipment.
5.6 Protection against electric shock
Subclause 5.6 of IEC 61851-1:2017 is not applicable.
5.7 Charging modes
Subclause 5.7 of IEC 61851-1:2017 is not applicable.
6 Charging modes and functions
Clause 6 of IEC 61851-1:2017 is applicable, except as follows.
6.1 General
Replacement:
Clause 6 describes the functions for energy transfer to EVs.
6.2 Charging modes
Subclause 6.2 of IEC 61851-1:2017 is not applicable.
6.3 Functions provided in Mode 2, 3 and 4
Subclause 6.3 of IEC 61851-1:2017 is replaced by the following:
6.3 Mandatory functions
6.3.1 General
The DC EV supply equipment shall supply a DC output current to the EV in accordance with the
requested DC output current parameter from the EV, subject to the requirements of the
mandatory functions as indicated below.
NOTE The DC EV supply equipment acts as a slave to the EV. Further details are given in Annex AA, Annex BB
and Annex EE.
The following functions shall be provided by the DC EV supply equipment:
• verification that the EV is properly connected to the DC EV supply equipment in accordance
with 6.3.2;
• verification of the latching of the vehicle coupler in accordance with 6.3.3;
• latching and unlatching of the vehicle coupler in accordance with 6.3.4;
• communication with the vehicle in accordance with 6.3.5;
• monitoring of the continuity of the control pilot circuit in accordance with 6.3.6;
• verification function before energy transfer in accordance with 6.3.7;

– 12 – IEC 61851-25:2020 © IEC 2020
• energization and control of the power supply to the EV in accordance with 6.3.8;
• protection against overvoltage in accordance with 6.3.9;
• de-energization of the power supply to the EV in accordance with 6.3.10;
• shutdown of DC EV supply equipment in accordance with 6.3.10.2, 6.3.10.3 and 6.3.10.4.
Values, timing and tolerances for the DC output current and the DC output voltages shall be
tested in accordance with Annex BB.
6.3.2 Verification that the EV is properly connected to the DC EV supply equipment
The DC EV supply equipment shall determine that the EV is properly connected to the DC EV
supply equipment.
Proper connection is assumed when the continuity of the control pilot circuit is detected.
Compliance is checked in accordance with DD.3.1.
6.3.3 Verification of the latching of the vehicle coupler
The DC EV supply equipment shall determine that the vehicle connector is properly latched to
the vehicle inlet.
The DC EV supply equipment shall not energize the conductors in the cable assembly when
the vehicle connector is not latched to a vehicle inlet.
The DC EV supply equipment shall enter into an emergency shutdown if the vehicle connector
is disconnected from the vehicle inlet while under power.
Compliance is checked in accordance with DD.3.8.6.
6.3.4 Latching and unlatching of the vehicle coupler
A mechanical or electromechanical means shall be provided to prevent intentional and
unintentional disconnection under load of the vehicle connector according to IEC 62196-1.
Compliance is checked by inspection.
6.3.5 Communication with the EV
6.3.5.1 General
Digital communication shall be established between the EV and the DC EV supply equipment
to validate and control the energy transfer.
The DC EV supply equipment shall be able to receive and interpret all mandatory digital
communication data as described in Annex FF.
Compliance is checked in accordance with Clause DD.3.
The vehicle connector shall not be energized until the compatibility assessment is successfully
completed in accordance with 6.3.7.2.
Compliance is checked by the test in Annex DD applying the messages defined in Table FF.2
and Table FF.3 of Annex FF.
IEC 61851-25:2020 © IEC 2020 – 13 –
6.3.5.2 Available DC output current parameter
The EV supply equipment shall inform the EV of the value of the available DC output current
that can be provided by the EV supply equipment.
The value may be changed and retransmitted during energy transfer, to adapt to power
limitations, (e.g. for load management), without exceeding the rated DC output current.
The DC EV supply equipment shall limit the DC output current to the available output current
parameter or interrupt the energy supply if the DC output current drawn by the EV exceeds the
available DC output current parameter.
Compliance is checked in accordance with DD.3.7 and DD.3.8.
6.3.5.3 Available DC output power parameter
A means shall be provided to inform the EV on the available DC output power of the DC EV
supply equipment.
The DC EV supply equipment may decrease the DC output current if the power demand exceeds
this value.
Compliance is checked in accordance with DD.3.7.
NOTE Available DC output power is indicated before the beginning of energy transfer. Dynamic power limitation
due to the AC supply network limitations is an option that could modify the available DC output power during energy
transfer on some DC EV supply equipment (see Clause EE.5).
6.3.5.4 DC output voltage target parameter and DC output voltage limit parameter
The DC EV supply equipment shall compare the DC output voltage with the values of the DC
output voltage target parameter and the DC output voltage limit parameter received from the
EV, and with the rated DC output voltage.
Shutdown conditions are in accordance with 6.3.10 if one of these values is exceeded.
Timing and tolerances that are applicable are indicated in Annex BB.
NOTE The values of the DC output voltage target parameter and the DC output voltage limit parameter are set
before the beginning of the energy transfer. They can be modified during energy transfer.
6.3.5.5 Monitoring of energy transfer requirements of the EV and adjustment of energy
supply conditions
A means shall be provided to continuously monitor the data transmitted by the EV and to adjust
the DC output current and/or DC output voltage and all associated parameters.
The DC EV supply equipment shall initiate an error shutdown if valid data is not received for
more than 1 s. An energy transfer cycle can be reinitiated by the EV after such shutdown.
The DC EV supply equipment shall be able to deliver DC output power up to the rated DC output
voltage and up to the rated DC output current within the limit of its rated DC output power at
the ambient temperature 0 °C to 40 °C below 2 000 m above sea level. The DC EV supply
equipment shall not exceed its available DC output power, even if the power requested by the
EV is higher than the available DC output power. Outside this operating range the DC EV supply
equipment is allowed to reduce the power.
NOTE 1 National or industrial codes and regulations can require different operating temperature ranges.
NOTE 2 Tolerances and timing for the DC output current are given in Annex BB.

– 14 – IEC 61851-25:2020 © IEC 2020
Compliance is checked in accordance with DD.3.7.
6.3.6 Monitoring of the continuity of the control pilot circuit
The EV supply equipment shall monitor the continuity of the control pilot circuit. The EV supply
equipment shall initiate an emergency shutdown on detection of interruption of the control pilot
circuit. Re-initialisation of the complete energy transfer procedure according to DD.3.5 shall be
required in order to restart the energy transfer cycle.
Compliance is checked in accordance with DD.3.5 and DD.3.8.6.
6.3.7 Verification function before energy transfer
6.3.7.1 General
The verification function is carried out when the vehicle connector has been fully inserted,
latched and the control pilot circuit verified (see DD.3.5 and EE.1.2), and before energy is
supplied to the EV.
6.3.7.2 Compatibility assessment before energy transfer
The DC EV supply equipment shall complete a compatibility assessment with the EV before
starting the energy transfer cycle. The check shall include at least the following elements:
• Reception of energy transfer requirements from the EV:
– DC output voltage target parameter;
– DC output voltage limit parameter;
• Validation by the DC EV supply equipment of information received from the EV;
• Transmission of DC EV supply equipment energy transfer parameters:
– available DC output current;
– rated DC output voltage;
– available DC output power;
• Transmission by DC EV supply equipment of the confirmed DC output voltage limit
parameter;
• Reception of validation information transmitted by the EV indicating that the information is
accepted.
Energy transfer shall only proceed if the compatibility assessment is completed correctly.
Compliance is checked in accordance with DD.3.3 applying the messages defined in Table FF.2
and Table FF.3.
6.3.7.3 Verification of the absence of a short-circuit on the cable assembly
With the EV connected to the DC EV supply equipment and before the EV contactor is closed,
the DC EV supply equipment shall have a means to check for a short circuit between DC+ and
DC− of the output circuit, the cable and vehicle coupler.
Compliance is checked in accordance with DD.3.4.
6.3.8 Energization of the power supply to the EV
The vehicle connector shall not be energized unless energy exchange has been allowed by the
control pilot function.
Compliance is checked in accordance with DD.3.5.

IEC 61851-25:2020 © IEC 2020 – 15 –
The DC output current and the DC output voltage of the DC EV supply equipment shall not
exceed the values of the parameters transmitted by the EV.
Compliance is checked in accordance with DD.3.6 and DD.3.8.
Requirements on the rate change of current, timing and tolerance are given in Annex BB.
6.3.9 Protection against overvoltage
The DC output voltage of the DC EV supply equipment shall not be greater than +2 % of the
rated DC output voltage.
The DC EV supply equipment shall perform an error shutdown if the measured DC output
voltage exceeds for more than 2 s the rated DC output voltage of the DC EV supply equipment
by 2 %, or the DC output voltage limit parameter sent by the EV by 1,5 V or 2 %, whichever is
the greater.
The DC EV supply equipment shall perform an emergency shutdown if the DC output voltage
exceeds the DC output voltage limit parameter sent by the EV by 1 % for 1 s or exceeds 150 V
for more than 30 ms.
Compliance is checked in accordance with DD.3.7 and DD.3.8.
6.3.10 De-energization of the power supply to the EV
6.3.10.1 General
If the signal status from the EV control energy transfer function no longer allows energization,
the power supply to the EV shall be interrupted but the control pilot circuit may remain in
operation.
Three shutdown procedures are possible:
• normal shutdown;
• error shutdown;
• emergency shutdown.
The DC EV supply equipment shall have a means to allow the user to initiate normal or
emergency shutdown.
Compliance is checked by inspection.
6.3.10.2 Normal shutdown
The DC EV supply equipment shall stop energy transfer by controlled interruption of DC output
current to the EV, where DC output current descends with a controlled slope under the control
of the EV and the DC EV supply equipment.
The data exchange and protocol are indicated in Annex EE.
Table 1 shows events and reducing conditions for normal shutdown.

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Table 1 – Normal shutdown events and conditions
Event Particular Time for starting to Minimum rate of DC
reduce DC output output current ramp
current down
Normal shutdown request Shutdown signal from Within 1 s after reception 100 A/s
a
from EV of the digital data frame
EV is received.
Normal shutdown by DC DC EV supply equipment According to the 100 A/s
b
EV supply equipment manufacturer's definition
detects internal events
and less than 1 min
Normal shutdown by DC User pushes on the stop Within 1 s 100 A/s
EV supply equipment button
a
Signal definitions are given in Annex FF.
b
For example, time limit exceeded.

Compliance is tested in accordance with DD.3.8.4.
6.3.10.3 Error shutdown
The DC EV supply equipment shall stop the energy transfer by controlled interruption of the DC
output current to the EV, where the DC output current descends with a controlled slope, after
the error shutdown is triggered by the DC EV supply equipment or by a message from the EV.
Table 2 indicates the main events and reducing conditions for error shutdown.
Table 2 – Error shutdown events and conditions
Event Particular Time for starting to Minimum rate of DC
reduce DC output current output current ramp down
Pilot wire voltage error State of CP is "Error" in Less than 100 ms 200 A/s
a
Table AA.1
Digital communication A valid digital data frame is Less than 100 ms after the 200 A/s
reception error not received for more than 1 s time-out
1 s
Overvoltage DC output voltage exceeds Less than 100 ms after the 200 A/s
rated DC output voltage of
2 s time-out
DC EV supply equipment
for more than 2 s
Or
DC output voltage exceeds
DC output voltage limit
parameter sent by EV
equipment for more than
2 s
Reception of shutdown Shutdown signal from EV is Within 1 s after reception of 200 A/s
signal from EV received the digital data frame
a
This error becomes emergency shutdown when the voltage is < 2,0 V DC (see 6.3.10.4).
b
The error signals are defined in Annex FF.

Compliance is tested in accordance with DD.3.8.5.

IEC 61851-25:2020 © IEC 2020 – 17 –
6.3.10.4 Emergency shutdown
The DC EV supply equipment shall stop power transfer within 30 ms after the emergency
shutdown was triggered. The DC output voltage shall fall (between DC+ and DC−) ≤ 60 V DC
within 1 s after the emergency shutdown was triggered.
The emergency shutdown shall be initiated by:
– the voltage of the control pilot circuit < 2,0 V DC;
– disconnection of vehicle connector under load;
– the DC output voltage exceeds DC output voltage limit sent by the EV or exceeds 150 V
DC for more than 30 ms, as described in 6.3.9;
– reception of emergency shutdown signal from EV or initiated by the user.
The DC output voltage of the DC EV supply equipment shall not be greater than +2 % of the
rated DC output voltage.
Compliance is tested in accordance with DD.3.8.6.
7 Communications
Clause 7 of IEC 61851-1:2017 is replaced with the following.
Replacement:
7.1 General
This Clause 7 provides a general description and the basic requirements for the control
communication function. The specific procedure and protocol is described in Annex EE.
The DC EV supply equipment supplies energy in response to digital information received by the
EV.
NOTE This implies that the EV manages the battery charging. The corresponding desired voltage and current levels
are transmitted to the DC EV supply equipment by the EV.
7.2 System configuration
The communication between the DC EV supply equipment and the EV is established using the
pilot control function and via digital communication, as described in Annex EE. The DC EV
supply equipment supplies energy to the EV according to the parameters sent by the EV,
provided all conditions required as indicated in Clause 6 are satisfied.
NOTE This implies that the EV controls the energy transfer. The DC EV supply system acts as a slave to the EV.
The detailed operational procedure is given in Clause 6 and in
...