IEC 61851-23:2014电动汽车直流充电系统国际标准

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IEC 61851-23:2014 © IEC 2014 – 11 –

6.2 EV charging mode

Replacement:

EV charging mode of this standard is Mode 4.

Mode 4 charging in this part means the connection of the EV to the supply network utilizing a

d.c. EV charging station (e.g. off-board charger) where the control pilot function extends to

the d.c. EV charging station.

Pluggable d.c. EV charging stations, which are intended to be connected to the a.c. supply

network (mains) using standard plugs and socket outlets, shall be compatible with residual

current device with characteristics of type A. The pluggable d.c. EV charging station shall be

provided with an RCD, and may be equipped with an overcurrent protection device.

Further requirements for pluggable d.c. EV charging stations are under consideration.

NOTE 1 In some countries, the use of an RCD of Type AC for d.c. EV charging station (a.c. mains) is allowed: JP.

NOTE 2 In some countries, US and CA, the use of a system of protection is required that is intended to interrupt

the electric circuit to the load when:

a) a fault current to earth (ground) exceeds some predetermined value that is less than that required to operate

the overcurrent protective device of the supply circuit,

b) the earthing (grounding) path becomes open-circuited or of excessively high impedance, or

c) a path to earth (ground) is detected on an isolated (ungrounded) system.

Replacement:

6.3 Types of EV connection

Replacement:

6.3.1 General description

The connection of EVs using cables shall be carried out in case of C connection as specified

in Part 1.

6.3.3 Adaptors

Replacement:

Adaptors shall not be used to connect a vehicle connector to a vehicle inlet.

Replacement:

6.4 Functions provided in d.c. charging

The d.c. EV charging station shall supply a d.c. current or voltage to the vehicle battery in

accordance with a VCCF request.

For non-regulated charging: under consideration.

Replacement:

6.4.1 Mode 4 charging functions

These functions shall be provided by d.c. charging system as given below:

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– 12 – IEC 61851-23:2014 © IEC 2014

– verification that the vehicle is properly connected;

– protective conductor continuity checking (6.4.3.2);

– energization of the system;

– de-energization of the system (6.4.3.4);

– d.c supply for EV (6.4.3.101);

– measuring current and voltage (6.4.3.102);

– retaining / releasing coupler (6.4.3.103);

– locking of the coupler (6.4.3.104);

– compatibility assessment (6.4.3.105);

– insulation test before charging (6.4.3.106);

– protection against overvoltage at the battery (6.4.3.107);

– verification of vehicle connector voltage (6.4.3.108);

– control circuit supply integrity (6.4.3.109);

– short circuit test before charging (6.4.3.110);

– user initiated shutdown (6.4.3.111);

– overload protection for parallel conductors (conditional function) (6.4.3.112);

– protection against temporary overvoltage (6.4.3.113).

Replacement:

6.4.2 Optional functions

These functions, if provided, should be provided by d.c. charging system as optional as given

below:

– determination of ventilation requirements of the charging area;

– detection/adjustment of the real time available load current of the supply equipment;

– selection of charging current;

– wake up of d.c. EV charging station by EV (6.4.4.101);

– indicating means to notify users of locked status of vehicle coupler.

Other additional functions may be provided.

NOTE 1 Un-intentional live disconnect avoidance functions may be incorporated in the latching function interlock

system.

NOTE 2 A positive means to prevent unintentional disconnect is required in some countries: US

NOTE 3 Primary protection against overvoltage and overcurrent of vehicle battery is the responsibility of the

vehicle.

Replacement:

6.4.3 Details of functions for DC charging

Replacement:

6.4.3.2 Protective conductor continuity checking

For isolated systems, protective conductor continuity between the d.c. EV charging station

and the vehicle shall be monitored. For the rated voltage of d.c. 60 V or higher, the d.c. EV

charging station shall perform an emergency shutdown (see 6.4.3.114) within 10 s after a loss

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IEC 61851-23:2014 © IEC 2014 – 13 –

of electrical continuity of the protective conductor between d.c. EV charging station and EV

(emergency shutdown).

For non-isolated systems, in case of loss of earthing conductor continuity, the non-isolated

d.c. EV charging station shall be disconnected from a.c supply network (mains). Earthing

conductor continuity between the d.c. EV charging station and the vehicle shall be monitored.

For the rated voltage of d.c. 60 V or higher, the d.c. EV charging station shall perform an

emergency shutdown within 5 s after a loss of electrical continuity of the protective conductor

between d.c. EV charging station and EV.

NOTE The isolated d.c. EV charging station can be disconnected from a.c. mains when PE continuity is lost.

6.4.3.4 De-energization of the system

Addition:

In the case of failure in control circuit of d.c. EV charging station, such as short-circuit, earth

leakage, CPU failure or excess temperature,

the d.c. EV charging station shall terminate the

supply of charging current, and disconnect the supply of control circuit. In addition, the

conductor, in which earth fault or overcurrent is detected, shall be disconnected from its

supply.

Requirement for disconnection of EV is defined in 7.2.3.2.

Compliance check: under consideration.

Addition:

6.4.3.101 DC supply for EV

The d.c. EV charging station shall supply d.c. voltage and current to the vehicle battery in

accordance with VCCF’s controlling.

For regulated systems, the d.c. EV charging station shall supply regulated d.c. voltage or

current (not simultaneously, but as requested by the vehicle during charging) to the vehicle

battery in accordance with VCCF’s controlling. Requirements for charging performance of

regulated d.c. current / voltage are given in 101.2.1.1, 101.2.1.2 and 101.2.1.3 and 101.2.1.4.

In either case mentioned above, the maximum ratings of the d.c EV charging station shall not

be exceeded.

The vehicle can change the requested current and/or requested voltage.

6.4.3.102 Measuring current and voltage

The d.c. EV charging station shall measure the output current and output voltage. The

accuracy of output measurement is defined for each system in Annexes AA, BB and CC.

6.4.3.103 Retaining/releasing coupler

A means shall be provided to retain and release the vehicle coupler. Such means may be

mechanical, electrical interlock, or combination of interlock and latch.

6.4.3.104 Locking of the coupler

A vehicle connector used for d.c. charging shall be locked on a vehicle inlet if the voltage is

higher than 60 V d.c.

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The vehicle connector shall not be unlocked (if the locking mechanism is engaged) when

hazardous voltage is detected through charging process including after the end of charging. In

case of charging system malfunction, a means for safe disconnection may be provided.

NOTE 1 The actuation portion of the locking function can be in either the vehicle connector or the vehicle inlet. It

is configuration dependent.

The d.c. EV charging station shall have the following functions in case the locking is done by

the d.c. EV charging station:

– electrical or mechanical locking function to retain the locked status, and

– function to detect the disconnection of the electrical circuits for the locking function.

NOTE 2 The locking function for each system is defined in Annexes AA, BB and CC.

NOTE 3 An example of lock function and disconnection detection circuit is shown in Annex AA.

For the tests of mechanical strength, refer to IEC 62196-3.

6.4.3.105 Compatibility assessment

Compatibility of EV and d.c. EV charging station shall be checked with the information

exchanged at the initialization phase as specified in 102.5.1.

6.4.3.106 Insulation test before charging

The d.c. EV charging station shall confirm the insulation resistance between its d.c. output

circuit and protective conductor to the vehicle chassis, including the charging station

enclosure, before the EV contactors are allowed to close.

If the required value is not met, the d.c. EV charging station shall send the signal to the

vehicle that the charging is not allowed.

Conformance is determined by measuring the insulation resistance as follows:

Any relays in the d.c. output circuit of the d.c. EV charging station shall be closed during the

test.

The required value of insulation resistance R shall be as shown in Formula (1):

≥ 100 Ω/V × U (1)

where

U is rated output voltage of the d.c. EV charging station.

6.4.3.107 Protection against overvoltage at the battery

The d.c. EV charging station shall perform an emergency shutdown and disconnect its supply

to prevent overvoltage at the battery, if output voltage exceeds maximum voltage limit sent by

the vehicle. In case of vehicle failure, disconnection from a.c. mains may not be necessary.

Specific requirement for detection and shutdown are defined in Annexes AA, BB and CC.

The vehicle can change the maximum voltage limit during charging process.

Compliance is checked according to the following test.

The d.c. EV charging station is connected to a d.c. voltage source or artificial load.

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