Monday, October 2, 2023

Reference Design For A Class 0.5 3-Phase Smart Meter

By Sharad Bhowmick

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TIDM-THREEPHASEMETER-F67641 from TI is a reference design that can calculate active and reactive power and energy, RMS current and voltage, power factor, line frequency, and fundamental and total harmonic distortion (THD) readings.

Smart meters serve multiple purposes in the energy landscape, including accurate real-time measurement of energy consumption, enabling consumers to monitor and manage their energy usage, supporting time-of-use pricing and demand response programs, improving grid efficiency and reliability, integrating renewable energy sources, and enhancing customer service through remote connectivity and access to detailed energy information. With their ability to provide precise data, promote energy efficiency, and enable dynamic pricing, smart meters play a vital role in creating a sustainable, reliable, and customer-centric energy system. If you want to build your own smart meter, Texas Instruments have released a reference design for a polyphase smart meter.

TIDM-THREEPHASEMETER-F67641 from TI is a reference design for a Class 0.5 Three-Phase Smart Meter Reference Design. A Class 0.5 three-phase smart meter is a highly accurate electricity meter used in three-phase electrical systems, providing precise measurement of energy consumption within ±0.5%. It enables accurate billing, energy management, and monitoring of parameters like active power and power factor.

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The TIDM-THREEPHASEMETER-F67641 reference design employs a MSP430F67641 polyphase metering System on Chip (SoC) for enabling smart meter functionality. The integrated firmware within the MSP430F67641 calculates all essential energy measurement parameters, making it a versatile and efficient choice for smart meter implementations. The Smart Meter Design reference design offers accurate and efficient energy measurement. It achieves Class 0.5 accuracy, and calculates parameters such as active and reactive power, RMS current and voltage, power factor, frequency, and THD readings through TI Energy Library firmware. The design includes add-on communication modules for ZigBee®, Wi-Fi®, Wireless M-Bus, and IEEE-802.15.4g, a built-in 160-segment display, and a direct power supply from the three-phase line voltage.

Key Features of TIDM-THREEPHASEMETER-F67641 reference design:

  • Class 0.5 Accuracy: The smart meter design ensures compliance with ANSI/IEC Class 0.5 accuracy requirements, meeting the highest standards for precise energy measurement.
  • TI Energy Library Firmware: The MSP430F67641 SoC comes equipped with the TI Energy Library firmware, which enables the calculation of all critical energy measurement parameters. This includes active and reactive power and energy, RMS current and voltage, power factor, line frequency, and fundamental and total harmonic distortion (THD) readings. The firmware provides a robust foundation for accurate energy measurement and analysis.
  • Communications Modules: The design supports add-on communications modules for wireless connectivity, facilitating seamless integration with communication standards such as ZigBee®, Wi-Fi®, Wireless M-Bus, and IEEE-802.15.4g. These modules offer flexibility in data transmission and enable efficient communication with external systems.
  • Built-in Display: The MSP430F67641 SoC incorporates a 160-segment display, providing a convenient and intuitive user interface for energy consumption monitoring. The display enables real-time feedback on energy usage, empowering consumers to make informed decisions about their energy consumption.
  • Three-Phase Line Voltage Power Supply: The smart meter design is powered directly from the three-phase line voltage, eliminating the need for additional power supplies and simplifying the overall design.

This reference design has been tested by TI. It comes with required design resources such as sample code, BoM, schematics, comprehensive documentation, etc. You can find additional data about the reference design on the company’s website. To read more about this reference design click here.

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