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D igital V oltage Transducer family. DVL from 50 to 2000 V RMS. DV from 1200 to 4200 V RMS. <filename>. DVL transducer versus DV. New design based on DV technology Modularity concept (input and output connections) Reduced input voltage and isolation
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Digital Voltage Transducer family DVL from 50 to 2000 VRMS DV from 1200 to 4200 VRMS <filename>
DVLtransducer versus DV • New design based on DV technology • Modularity concept (input and output connections) • Reduced input voltage and isolation • More compact same dimensions as AV 100, same footprint as LV 100 • Much larger quantities than DV • Will complete LEM family of voltage transducers • Improved technology (technical risk is reduced) • Solution to reduce cost (simplified electronic, worst accuracy than DV, but better than AV and LV, simplification of insulation, production in China, higher quantities …)
DVL: the improvements • Very good accuracy and stable in temperature • Partial discharge extinction voltage of 2.7 kV compatible with permanent DC voltages up to 2 kV • Low power consumption and losses • High immunity to fast common mode voltage changes (several kV/s) • Very low sensitivity to electro magnetic disturbances • Insensitive to magnetic fields • Low output noise • Input voltage from 50V to 2000V • Output current available: ±50mA or 4 to 10mA
DVLtransducer Input Output terminals Input terminals Output connecter <filename>
DVLtransducer Input output cable Other output on request <filename>
DVL Technology • The primary high input voltage is divided using 2 high voltage dividers, able to withstand high dv/dt and having a low thermal drift. • A sigma-delta modulator on the primary side converts this analog value to a serial digital signal (bit-stream and clock are encoded together), that allows to transmit data via one single isolated channel (10MHz). • Digital data transmission is isolated by a transformer to provide insulation characteristic.
DVL Technology • On the secondary side the bit-stream is decoded, filtered and transmitted to the micro-controller by a digital filter. • A micro-controller transfers data from the digital filter to a 12 bits DA converter, the transfer time is around 7 μs, this define the response time and the bandwidth of the transducer. • Once the micro-controller in place, it is also use for offset and gain adjustment during production. • Analog output voltage from DA is then filtered and converted into a current (75 mA full scale) using a current generator protected against short circuits. A voltage output is also foreseen if needed.
DVL Technology • A DC/DC converter connected to customer supply provide different supply voltages for the secondary side, primary side is supplied through an other isolated transformer having the same principle than the one use for data transmission. • Using an innovative design, these 2 isolated transformers guarantee insulation and partial discharge level for voltage application up to 2000V, and their low parasitic capacitance reduce the effect of dynamic common mode.
DVL typical performance • Accurate and stable in temperature Typical error of reading in temperature Typical linearity error
