EN IEC 62053-22 Static Meters for AC Active Energy (Classes 0,1S, 0,2S and 0,5S)

The standard “EN IEC 62053-22 Electrical measuring equipment - Special requirements - Part 22: Static meters for AC active energy (classes 0,1S, 0,2S and 0,5S)”, developed by the International Electrotechnical Commission (IEC) and later published as a European standard within the scope of harmonization efforts, applies only to transformer-operated static watt-hour meters with accuracy classes 0,1S, 0,2S and 0,5S used for measuring alternating current electrical active energy in 50 Hz or 60 Hz networks, and only for type testing purposes.

This standard applies to electrical measuring equipment designed for the following purposes:

• Measuring and controlling electrical energy in power grids with voltages up to 1000 Volts AC.
• Except for the display screens, all functional elements, including additional modules, must be housed within a single meter housing or in a way that forms part of such a housing.
• Operating with integrated or separate display screens, or without a display screen.
• To be mounted in a specified suitable socket or rack.
• Optionally, providing additional functions besides measuring electrical energy.

This standard does not apply to:

• Meters where the line-neutral voltage derived from the nominal voltage exceeds 1000 Volts.
• Meters designed for connection with low-power measuring transformers (defined in the IEC 61869 standard series) and tested without these transformers.
• Measurement systems consisting of multiple devices that are physically distant from each other.
• Portable meters (portable meters are meters that are not permanently connected).
• Meters used in railway vehicles, cars, ships, and airplanes.
• Laboratory and meter testing equipment.
• Reference standard meters.
• Data interfaces between the meter and the recording device.
• Matching sockets or racks used for the installation of electrical measuring equipment.
• Additional functions provided in electricity meters.

In short, the EN IEC 62053-22 standard covers specific requirements and type testing for high-precision static electricity meters used to measure AC active energy. The primary aim of this standard is to establish uniform performance and testing requirements for high-precision static watt-hour meters used in commercial and industrial power measurement. This standard guarantees that electricity meters meet the following criteria:

• To accurately measure active electrical energy.
• To maintain measurement performance throughout its service life.
• To operate reliably under a variety of environmental and electrical conditions.
• To produce consistent and comparable measurement results, regardless of the manufacturer.
• To support fair energy billing and power system monitoring.

The EN IEC 62053-22 standard applies to:

• Static (electronic) watt-hour meters
• AC mains operating at 50 Hz or 60 Hz
• Transformer-operated meters
• Type testing of newly manufactured meters
• Electrical measuring equipment operating on networks up to 1.000 Volts AC.
• Meters with integrated or removable displays
• Meter designs that can include additional non-measuring functions within the same housing.

This standard focuses solely on active energy measurement.

One of the defining characteristics of the EN IEC 62053-22 standard is its stringent accuracy requirements. This standard covers the following:

• 0.1S: National reference measurement and calibration laboratories
• 0.2S: Electrical substations, transmission systems
• 0.5S: Industrial facilities, commercial energy management

The “S” designation indicates a specific level of accuracy for transformer-operated meters where precise measurement, especially at low current levels, is required.

The EN IEC 62053-22 standard specifies the following technical requirements:

• Measurement accuracy: The meters must remain within the specified error limits under the following conditions:
  • Reference conditions
  • Different current values
  • Various power factors
  • Voltage changes
  • Frequency changes
• Initial performance: The meter should begin accurately recording energy when the current exceeds the specified initial threshold.
• No-load condition: The meter should not record energy when there is no actual energy consumption.
• Impact levels: Performance is evaluated under a number of working conditions, including:
  • Temperature change
  • Gender
  • Supply voltage fluctuations
  • Frequency deviations
  • Electromagnetic disturbances
  • Harmonic distortion
  • Mechanical vibration
• Electrical insulation: This standard confirms the following:
  • Dielectric strength
  • Insulation resistance
  • Safety between live parts and accessible surfaces.
• Electromagnetic compatibility: Meters must continue to function correctly when exposed to the following:
  • Electrostatic discharge (ESD)
  • Electrical fast transients
  • Overvoltages
  • Conductive breakdowns
  • Emitted electromagnetic fields

These tests help ensure reliable operation in electrically noisy environments such as substations and industrial facilities.

The EN IEC 62053-22 standard includes comprehensive laboratory type tests such as:

• Verification of accuracy
• Starting current test
• No-load test
• Voltage change test
• Frequency change test
• Power factor test
• Temperature performance test
• Mechanical impact test
• Insulation test
• EMC test
• Climate tests
• Long-term stability assessment

These tests demonstrate that the meter design meets the specified performance requirements before going into production.

Meters conforming to the EN IEC 62053-22 standard are widely used in the following areas:

• Electricity distribution companies
• Energy transmission networks
• Distribution transformer substations
• Industrial energy monitoring
• commercial buildings
• Smart grid infrastructure
• Renewable energy facilities
• High-precision sub-metering systems

Compliance with the EN IEC 62053-22 standard offers several advantages:

• High measurement accuracy.
• Reliable long-term performance
• Consistent energy billing
• Improved customer trust.
• Interoperability in European markets
• Reduced measurement uncertainty
• Enhanced network monitoring
• Support for smart meter systems

The EN IEC 62053-22 standard is part of the IEC 62053 family of electricity meter standards, which includes the following standards:

• EN IEC 62053-21 Static meters for active energy (Class 1 and Class 2)
• EN IEC 62053-22 Static meters for active energy (0.1S, 0.2S, 0.5S Classes)
• EN IEC 62053-23 Static meters for reactive energy.
• EN IEC 62053-24 Static meters for reactive energy with higher accuracy.

These standards complement the broader IEC 62052 series of standards, which defines general requirements, tests, and conditions for electrical measuring equipment.

The EN IEC 62053-22 standard is generally applied by the following sectors:

• Electricity companies
• Meter manufacturers
• Calibration laboratories
• Electrical equipment manufacturers
• Smart grid developers
• Renewable energy operators
• Industrial automation companies
• Energy quality monitoring organizations

Accurate electricity metering is fundamental to modern energy systems. Especially in high-energy industrial and utility applications, even small measurement errors can lead to significant financial discrepancies over time.

The EN IEC 62053-22 standard helps ensure reliable performance of high-accuracy energy meters throughout their service life. By defining standardized test procedures and stringent accuracy requirements, this standard supports fair billing, effective energy management, regulatory compliance, and confidence in electricity metering both European and internationally. It also provides a common technical framework enabling manufacturers and energy companies to deliver interoperable, high-performance metering solutions in both conventional and advanced smart grid environments.

For many years, our organization, with its competent and experienced staff, has been understanding the needs of its clients, providing the advanced testing services they require, and assisting them in the establishment, implementation, and improvement of management systems. Within this framework, we also provide testing services compliant with the EN IEC 62053-22 standard.