Monitoring mining machinery, installations and power supply - measuring and evaluating current and voltage with measuring appts. integrated in existing compact stations

摘要

The rated input voltage is 1,000 volts and the input current 5 or 10 amps. The power is supplied by the available compact stations. The harmonic in the input stage is filtered out to derice the peak values of current and voltage. The phase position is derived in parallel. The phase angle, theta, derived is converted into corresp. values of the mathematical functions cos theta and sin theta. The product is calculated from voltage and current, voltage X current and X cos theta and voltage X current X sin theta. ADVANTAGE - Faultless monitoring based on measurement of loading of drive, and electrical supply network including in relation to idle power, actual and apparent power.