As we all know the energy meter which exported to Europe must be MID certified since 2006. IVY METERING’s AC energy meters such as Lorawan energy meter and bidirectional RS485 Modbus energy meter are MID approved- Module B+Module D. But all of them are AC energy meter because MID has been applied in the European member states to certify AC electricity meters.Then How about DC energy meter, is there any DC energy meter with MID approval?
With the development of BESS system, solar projects and EV Charging, especially for fast chargers, manufacturers now increasingly use DC electricity meters. According to the traditional view, the MID does not cover DC meters. So, IVY tried to find some labs such as NMI or SGS to evaluate our DC energy meter for ev charger field. Let’s learn the standard together:
1.IEC62053-41 [2021]
IEC TC 13 published a dedicated standard for DC meters, the 62053-41 [2021]. IEC 62053-41:2021 applies only to static watt-hour meters of accuracy classes 0,5 and 1 for the measurement of DC electrical energy in DC systems, and it applies to their type tests only.
We got it from IEC offical website that this document applies to electricity metering equipment designed to:
• measure and control electrical energy on electrical networks with two poles where one of the poles is connected to earth and with voltage up to 1 500 V DC;
• have all functional elements, including add-on modules, enclosed in, or forming a single meter case with the exception of indicating displays;
• operate with integrated or detached indicating displays, or without an indicating display;
• be installed in a specified matching socket or rack;
• optionally, provide additional functions other than those for measurement of electrical energy.
They may be used for measuring DC electrical energy, amongst others, in the following application areas:
• in EV (electrical vehicle) charging stations or in EV charging infrastructures, if the measurement is placed on the DC side;
• in information technology (IT) server farms;
• in DC supply points for communication equipment;
• in low voltage DC networks for residential or commercial areas, if the measurement is placed on the DC side;
• in solar PV (photovoltaic) systems where DC power generation is measured;
• in DC supply points for public transport networks (e.g. trolleybus, etc.).
Meters designed for operation with low power instrument transformers, LPITs as defined in the IEC 61869 series, may be tested for compliance with this document only if such meters and their LPITs are tested together and meet the requirements for directly connected meters.
This document does not apply to:
• meters for which the voltage between the two poles, where one of the poles is connected to earth, exceeds 1 500 V DC;
• meters to be used in networks other than with two poles in which one of the poles is connected to earth;
• meters intended for connection with low power instrument transformers (LPITs as defined in the IEC 61869 series) when tested without such transformers;
• metering systems comprising multiple devices physically (except LPITs) remote from one another;
• portable meters;
• meters used in rolling stock, vehicles, ships and airplanes;
• laboratory and meter test equipment;
• reference standard meters;
• data interfaces to the register of the meter;
• matching sockets or racks used for installation of electricity metering equipment;
• any additional functions provided in electrical energy meters.
This document does not cover measures for detection and prevention of fraudulent attempts to compromise a meter’s performance (tampering).
2.IEC62052-11 [2020]
IEC 62052-11:2020 specifies requirements and associated tests, with their appropriate conditions for type testing of AC and DC electricity meters.
IEC 62052-11:2020 specifies requirements and associated tests, with their appropriate conditions for type testing of AC and DC electricity meters. This document details functional, mechanical, electrical and marking requirements, test methods, and test conditions, including immunity to external influences covering electromagnetic and climatic environments.
This document applies to electricity metering equipment designed to:
• measure and control electrical energy on electrical networks (mains) with voltage up to 1 000 V AC, or 1 500 V DC;
• have all functional elements, including add-on modules, enclosed in, or forming a single meter case with exception of indicating displays;
• operate with integrated displays (electromechanical or static meters);
• operate with detached indicating displays, or without an indicating display (static meters only);
• be installed in a specified matching sockets or racks;
• optionally, provide additional functions other than those for measurement of electrical energy.
Meters designed for operation with Low Power Instrument Transformers (LPITs as defined in the IEC 61869 series) may be tested for compliance with this document and the relevant IEC 62053 series documents only if such meters and their LPITs are tested together as directly connected meters.
This document is also applicable to auxiliary input and output circuits, operation indicators, and test outputs of equipment for electrical energy measurement.
This document also covers the common aspects of accuracy testing such as reference conditions, repeatability and measurement of uncertainty.
This document does not apply to:
• meters for which the voltage line-to-neutral derived from nominal voltages exceeds 1 000 V AC, or 1 500 V DC;
• meters intended for connection with low power instrument transformers (LPITs as defined in the IEC 61869 series of standards) when tested without such transformers;
• metering systems comprising multiple devices (except of LPITs) physically remote from one another;
• portable meters;
• meters used in rolling stock, vehicles, ships and airplanes;
• laboratory and meter test equipment;
• reference standard meters;
• data interfaces to the register of the meter;
• matching sockets or racks used for installation of electricity metering equipment;
• any additional functions provided in electrical energy meters.
This document does not cover measures for the detection and prevention of fraudulent attempts to compromise a meter’s performance (tampering).
This second edition cancels and replaces the first edition published in 2003, and its amendment 1:2016. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) Removed all meter safety requirements; the meter safety requirements are covered in IEC 62052-31:2015;
b) Included requirements for meter power consumption and voltage requirements from IEC 62053-61; IEC 62053-61 is withdrawn;
c) Included requirements for meter symbols from IEC 62053-52; IEC 62053-52 is withdrawn;
d) Included requirements for meter pulse output devices from IEC 62053-31; IEC 62053-31 is withdrawn;
e) Added new requirements and tests including: meters with detached indicating displays, and meters without indicating displays, meter sealing provisions; measurement uncertainty and repeatability; time-keeping accuracy; type test report
f) Updated and clarified acceptance criteria for testing of external influences;
g) Revised and updated tests for immunity to electromagnetic influences and disturbances as per the latest editions of the basic EMC publications.
3.EN 50470-4
Now CENELEC TC 13 initiative to work on a new standard EN 50470-4 for DC meters. This standard has been published in 2023 and is used in conjunction with the EN 62052-11, a nearly identical copy of its IEC variant. The documents are intended for use as part of harmonised standards under the MID.
This document applies only to static watt-hour meters of accuracy classes A, B and C for the measurement of direct current electrical active energy in DC systems and it applies to their type tests.
NOTE 1 For general requirements, such as construction, EMC, safety, dependability etc., see the relevant EN 62052 series or EN 62059 series.
This document applies to electricity metering equipment designed to:
- measure and control electrical energy on DC electrical networks with voltages up to 1 500 V;
NOTE 2 Meters for unearthed DC supplies and meters for three-wire DC networks are within the scope of this document.
- form a complete meter including the legally relevant display of measured values;
NOTE 3 Electrical energy meters constructed from separate parts as described in WELMEC Guide 11.7:2017 are included.
- operate with integrated or detached legally relevant displays;
- optionally, provide additional functions other than those for measurement of electrical energy.
They can be used for measuring DC electrical energy, amongst others, in the following application areas:
- in EV (electrical vehicle) charging stations or in EV charging infrastructure (also called EVSE, electric vehicle supply equipment), if energy is measured on the DC side;
- in solar PV (photovoltaic) systems where DC power generation is measured;
- in low voltage DC networks for residential or commercial areas, if energy is measured on the DC side, including similar applications like information technology (IT) server farms or DC supply points for communication equipment;
- in DC supply points for public transport networks (e.g. for trolleybuses);
- in mobile applications on vehicles for e-road (electric road) systems.
Meters designed for operation with external DC instrument transformers, transducers or shunts can be tested for compliance with this document only if such meters and their transformers, transducers or shunts are tested together and meet the requirements for directly connected meters. Requirements in this document and in EN IEC 62052 11:20211 applying to meters designed for operation with DC LPITs also apply to meters designed for operation with external instrument transformers, transducers or shunts.
NOTE 4 Modern electricity meters typically contain additional functions such as measurement of voltage magnitude, current magnitude, power, etc.; measurement of power quality parameters; load control functions; delivery, time, test, accounting, recording functions; data communication interfaces and associated data security functions. The relevant standards for these functions could apply in addition to the requirements of this document. However, the requirements for such functions are outside the scope of this document.
NOTE 5 Product requirements for power metering and monitoring devices (PMDs) and measurement functions such as voltage magnitude, current magnitude, power, etc., are covered in EN IEC 61557-12:2022. However, devices compliant with EN IEC 61557-12:2022 are not intended to be used as billing meters unless they are also compliant with EN IEC 62052 11:20211 and this document.
NOTE 6 Requirements for DC power quality (PQ) instruments, DC PQ measuring techniques, and DC PQ instrument testing are under discussion and will be specified in other standards.
This document does not apply to:
— portable meters;
NOTE 7 Portable meters are meters that are not permanently connected.
— meters used in rolling stock (railway applications), ships and airplanes;
NOTE 8 DC meters for rolling stock are covered by other standards, e.g. by the EN 50463 series.
4.German document VDE-AR-E 2418-3-100 [2020]
Additionally, the German document VDE-AR-E 2418-3-100 [2020], with its specific Annex A for DC meters, provides means to assess DC meters. In this standard, the MID philosophy is also implemented, with Annexe V’s requirements.
This VDE application guide specifies the minimum requirements for measuring and calibrating energy and time measurement equipment for conductive AC and DC charging stations for the supply of electricity to or from electric vehicles that are placed on the market in accordance with the applicable product standards, e. g. DIN EN 61851 series.
This VDE application guide defines terms, pictograms, configurations, requirements and tests for this purpose.
Intensively debated within organisations like WELMEC(WELMEC is the representative organisation of national legal metrology authorities in Europe), the idea has grown as well that the MID, with its instrument specific Annex V, could be allowed for DC meters as well. Advocated in large part by the work of LegalEVcharge, the following arguments promote increased acceptance:
The MID describes meters for ‘active electrical energy’. Fundamentally this covers both AC and DC electricity meters.
As laid down in Annex V, instrument-specific requirements can be fulfilled for both types of meters.
The fact that via Mandate M/541, European standardisation committees were requested to create standards for DC meters for legal metrological applications is also a clear sign that the European Commission wants to apply the MID for the use of DC meters.
IVY METERING released 5 DC meters a few years ago, EM613001 613002 613005 with a built-in shunt, and an EM619001 and EM619002 with an external shunt, as low as 8-48VDC and as high as 2000A 1000VDC 1500VDC can be used, at the same time they also come with RS485 communication tariffs, etc.,They are NMI-MID certificate pending, we are also verifying the standards mentioned above, if you need, please do not hesitate to feedback to us, the louder your voice the faster our certificate will get!
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