Electric Vehicle Supply Equipment
IEC 61851 is an international standard for conductive charging systems for electric vehicles (EV). IEC 61851 covers the mechanical, electrical, communications, EMC and performance requirements for EV Supply Equipment (EVSE, charging station) used to charge electric vehicles, including light electric vehicles.
Electric vehicles cover all road vehicles, including plug-in hybrid road vehicles (PHEV), that derive all or part of their energy from on-board rechargeable energy storage systems (RESS).
It describes the characteristics and operation conditions of the EVSE and its connection to the electric vehicles, the operators and third parties’ electrical safety, and the characteristics to be complied with by the vehicle with respect to the AC/DC EVSE, when the vehicle is earthed.
IEC 61851-1 – General requirements
This part of IEC 61851 applies to EV supply equipment for charging electric road vehicles, with a rated supply voltage up to 1,000V AC or up to 1,500V DC and a rated output voltage up to 1,000V AC or up to 1,500V DC.
This standard also applies to EV supply equipment supplied from on-site storage systems (e.g.buffer batteries).
The aspects covered in this standard include:
- The characteristics and operating conditions of the EV supply equipment
- The specification of the connection between the EV supply equipment and the EV
- The requirements for electrical safety for the EV supply equipment.
IEC 61851-21-2 Electric vehicle requirements for conductive connection to an AC/DC supply – EMC requirements for off-board electric vehicle charging systems
This part of IEC 61851 defines the EMC requirements for any off-board components or equipment of such systems used to supply or charge electric vehicles with electric power by conductive power transfer (CPT), with a rated input voltage, according to IEC 60038:2009, up to 1,000V AC or 1,500V DC and an output voltage up to 1,000V AC or 1,500V DC.
This document covers off-board charging equipment for mode 1, mode 2, mode 3 and mode 4 charging as defined in IEC 61851-1:2017.
Cables where there is no electronics, or no electric/electronic switching are considered as passive (benign) and are deemed to comply with the emission and immunity requirements of this document without any need for testing.
This document does not apply to any on-board components or equipment of charging or power supply system’s being part of the vehicles. The EMC requirements for such equipment are covered by IEC 61851-21-1: 2017.
Compliance with the emission and immunity requirements of this document is verified where it can be demonstrated that the equipment under test (EUT) meets the respective limits, during type tests in the measuring arrangement of this document.
Requirements for electric vehicle wireless power transfer (WPT) systems are covered in IEC 61980 (all parts).
IEC 61851-23:2014 DC electric vehicle charging station
This part of IEC 61851, together with IEC 61851-1, gives the requirements for DC EV charging stations, herein also referred to as “DC charger”, for conductive connection to the vehicle, with an AC or DC input voltage up to 1,000V AC and up to 1,500V DC according to IEC 60038.
This standard provides the general requirements for the control communication between a DC EV charging station and an EV. The requirements for digital communication between DC EV charging station and electric vehicle for control of DC charging are defined in IEC 61851-24.
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 DC EV charging station (e.g., off-board charger) where the control pilot function extends to the DC EV charging station.
IEC 61851-24:2014 Digital communication between a DC EV charging station and an electric vehicle for control of DC charging
IEC 61851-24, together with IEC 61851-23, applies to digital communication between a DC EV charging station and an electric road vehicle (EV) for control of DC charging, with an AC or DC input voltage up to 1,000V AC and up to 1,500V DC for the conductive charging procedure. The EV charging mode is mode 4, according to IEC 61851-23. Annexes A, B, and C give descriptions of digital communications for control of DC charging specific to DC EV charging systems A, B and C as defined in Part 23.