The AlphaPOWER range of instruments includes both a 3 phase VAR Transducer, the E1-VAR series, and a combined VAR/VAR-Hour Transducer, the VVH-3.
The E1-VAR series instruments measure the AC current and voltage and multiply them together using a pulse height/width system to generate a differential dc voltage proportional to the VAR measurement. A symmetrical dc amplifier then converts this to a true constant dc current output.
The VVH-3 provides two outputs; one a proportional, linear and highly accurate dc current output representing the measured VAR and the other a VAR-Hour measurement. The VAR-Hour output can be either a volt-free contact or an open collector output. The instrument has isolation between the inputs, output and power supply. The output section of the instruments can be calibrated for a wide range of inputs and the pulse rate of the output VAR-Hour measurement can also be calibrated to suit the required scale. Advanced circuit design gives the VVH-3 true 0.1% accuracy for both VAR and VAR-Hour measurement. The VVH-3 is housed in polycarbonate plastic enclosure suitable for both DIN rail or Bulkhead mounting.
