Electric vehicle conductive charging system - Part 25: DC EV supply equipment where protection relies on electrical separation

IEC 61851-25:2020 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.

Système de charge par conduction pour véhicules électriques - Partie 25: Système d'alimentation en courant continu pour véhicules électriques dont la protection s'appuie sur la séparation électrique

L'IEC 61581-25:2020 s'applique aux systèmes d'alimentation en courant continu pour VE pour la charge des véhicules électriques destinés à circuler sur la voie publique, avec une tension d'alimentation assignée maximale de 480 V en courant alternatif ou de 600 V en courant continu, une tension de sortie assignée maximale de 120 V en courant continu et des courants de sortie continus maximaux de 100 A.
Le présent document fournit les exigences relatives aux systèmes d'alimentation en courant continu pour VE dont le circuit secondaire est protégé du circuit primaire par une séparation électrique.
Les exigences relatives au flux de puissance bidirectionnel ne sont pas traitées dans le présent document.
Le présent document fournit également les exigences relatives à la commande et à la communication entre un système d'alimentation en courant continu pour VE et un VE.
Le présent document s'applique également aux systèmes d'alimentation en courant continu pour VE alimentés par des systèmes de stockage sur site.
Les aspects couverts par le présent document incluent:
• les caractéristiques et les conditions de fonctionnement du système d'alimentation en courant continu pour VE;
• la spécification de la connexion entre le système d'alimentation en courant continu pour VE et le VE;
• les exigences relatives à la sécurité électrique du système d'alimentation en courant continu pour VE.
Des exigences supplémentaires peuvent s'appliquer au matériel conçu pour des environnements ou conditions spécifiques, par exemple:
• les systèmes d'alimentation en courant continu pour VE situés dans des zones dangereuses contenant du gaz ou de la vapeur inflammable et/ou des matières combustibles, des carburants ou d'autres combustibles, ou des matières explosives;
• les systèmes d'alimentation en courant continu pour VE conçus pour être installés à au moins 2 000 m d'altitude;
• les systèmes d'alimentation en courant continu pour VE destinés à être utilisés à bord de navires.
Les exigences relatives aux appareils et composants électriques utilisés dans le système d'alimentation en courant continu pour VE ne sont pas incluses dans le présent document et sont couvertes par leurs normes de produits spécifiques.
Le présent document ne s'applique pas:
• aux aspects de sécurité relatifs à la maintenance;
• à la charge des trolleybus, des véhicules ferroviaires, des chariots de manutention et des véhicules principalement tout-terrain;
• au matériel installé sur le VE;
• aux exigences CEM du matériel installé sur le VE connecté, qui sont couvertes par l'IEC 61851-21-1;
• à la charge du RESS hors du VE.

General Information

Status
Published
Publication Date
03-Dec-2020
Current Stage
PPUB - Publication issued
Completion Date
04-Dec-2020
Ref Project

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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
IEC 61851-25:2020-12(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
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

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 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

---------------------- Page: 4 ----------------------
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

---------------------- Page: 5 ----------------------
– 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,

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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

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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.
---------------------- Page: 6 ----------------------
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.
---------------------- Page: 7 ----------------------
– 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.
---------------------- Page: 8 ----------------------
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

---------------------- Page: 9 ----------------------
– 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]
---------------------- Page: 10 ----------------------
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
---------------------- Page: 11 ----------------------
– 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.
---------------------- Page: 12 ----------------------
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;
---------------------- Page: 13 ----------------------
– 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 v
...

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