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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 mainsa 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 • 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
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
Conducted disturbances Mains quality - 2 kHz Radio 150 kHz -
Real environmet Read out Disturbances Meter Signal attenuation
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
Technology status Mains signalling is commercial technology Echelon PLT-31xx
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?
Project description • Objectives • Reports on: • Experiences from current use • Characterization of sources • Models for simulation • Advice for installations
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
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