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Signalling on the mains a project proposal

Signalling on the mains a project proposal. Jan Welinder SP Swedish National Testing and Research Institute + 46 33 165171 jan.welinder@sp.se. SP Elektronics: EMC/Radio. Testing EMC Radio HF R&D Numerical methods Antenna technology Measurement techn. Background.

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Signalling on the mains a project proposal

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  1. Signalling on the mainsa project proposal Jan Welinder SP Swedish National Testing and Research Institute + 46 33 165171 jan.welinder@sp.se

  2. SP Elektronics: EMC/Radio • Testing • EMC • Radio • HF • R&D • Numerical methods • Antenna technology • Measurement techn.

  3. Background • Monthly electricity bills (new Swedish law): • Several technologies: • Short distance radio • GSM • Modem • Optofibre • Special systems • Mains • Project KFM (Nätverk- och Kunskapsplats för Elmät) • Electricity meters and EMC at SP

  4. Standards • Mains signalling is standardized: EN 50065-series • (parts harmonized under LVD and EMCD) • Standards define: • Frequency bands (3 – 148,5 kHz) • Levels • EMC • Filters • Access rules

  5. Conducted disturbances Mains quality - 2 kHz Radio 150 kHz -

  6. Allowed levels

  7. Real environmet Read out Disturbances Meter Signal attenuation

  8. Disturbances – office (frequency domain)

  9. Frequency domain • Detectors • Peak max value (poor relation to digital signals) • Quasi peak “low pass” (poor relation to digital signals) • Average somewhat better • RMS good for white noise • APD amplitude statistics (related to BER) • No simple relations between frequency domain measurements and communication problems

  10. Technology status Mains signalling is commercial technology Echelon PLT-31xx

  11. Project description • Investigation of disturbance problems when using the mains for data transfer from electricity meters using the frequency range 3 – 148 kHz • Questions: • What are problems do exist? • When and why do they occur? • When should alternative technologies be used? • Can anything be done when disturbances occur? • Will disturbances come after installations when new installations are done?

  12. Project description • Objectives • Reports on: • Experiences from current use • Characterization of sources • Models for simulation • Advice for installations

  13. Project description • Measurement technology • Development of a measurement network • Development of measurement procedures • Amplitude statistics or traditional measurements? • Time domain and/or frequency domain? • Measurements in real installations • Lab measurements on sources

  14. Project description • Method – simulation/prediction • Development of methods to use existing simulations tools for analysis of mains net communication • A tool for computer analysis and prediction of the behaviour of installations and products

  15. Simulations - EMEC

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