Avr electronics associated with janitza germany has manufactured prophi series microprocessor based intelligent reactive power controllers which can control automatic connection and disconnection of capacitor banks depending upon setting soft target pf. The sequence of switching of the power factor controller is selected so that target power factor is reached by less switching operations enhancing the life of switching elements and capacitors. The company supplies this prophi series in relay output version [3r, 6r, 12r] for standard contactor switching and transistor output version [3t, 6t, 12t] for fast response solid state switching. These two versions can reduce heavy currents, voltage flicker in case of dynamic loads like cranes, welding equipment, etc. The prophi comes with special advantages of digital display of v, i, f, q, p, s electrical parameters; up to 19 odd harmonics; password protection and alarm outputs in case of over and under voltages; under compensation; harmonic threshold over temperature, etc.
