Secondary Standard for AC Power and Energy at 50 Hz

The Secondary Standard for AC Power and Energy ensures traceability for measuring electric power (watt) and energy (watt-second) at a frequency of 50 Hz. These units are derived from fundamental SI units through appropriate defining equations. Given the increasing importance of efficient energy usage due to limited conventional energy sources, precise measurement of electric power and energy is essential for optimizing consumption and improving energy efficiency.

Function and Importance

• Ensures high-accuracy measurement for electric power and energy across various sectors.
• Supports energy producers, manufacturers, and importers of power meters.
• Enhances economic efficiency by enabling more accurate metering and consumption analysis.

Measurement Principles

• Electric power measurement is derived from the metrology of voltage, resistance, and phase shift.
• Energy measurement is performed using the power measurement method and its integration over time.

International Traceability and Comparisons

• The declared metrological parameters have been verified through key EURAMET EM-K5 (2011 and 2018) intercomparisons.
• Additional bilateral comparisons with national metrology institutes such as ČMI (Czech Republic) and GUM (Poland) confirm its accuracy.
• The international recognition of the standard is documented in the BIPM database.

Technical Specifications

• Highly precise reference standard for power and energy, based on analog-to-digital (A/D) conversion of input quantities (voltage and current).
• Synthetic power sources capable of generating AC measurement signals with:
  • 500 VA / 600 V
  • 500 VA / 120 A
  • Phase angle range: 0° to 360°
  • Fundamental frequency range: 40 Hz to 70 Hz.

This secondary standard ensures high-accuracy calibration for power meters and energy measurement devices, thereby playing a crucial role in industrial applications, electricity metering, and energy conservation efforts.