Q3. A large industrial plant receives 3-phase electric power from the local utility. The following loads are being fed in the plant at 11.0 kV: (i) (ii) (iii) 1.2 +j 1.2 MVA 2.0 MW at 0.8 (lag) power factor 800 kW of pure heating and lighting (negligible reactive power) load A number of induction motors: total power output of 3,000 HP, with a composite efficiency of 0.85 and power factor of 0.88 (lag) Analyse the total active power, reactive power and apparent power Compute the overall (composite) load power factor and the full load current Plan the capacitive VAR requirements for the capacitor bank if the overall plant power factor is to be improved to 0.95 lag (iv) Draw the simplified one-line diagram and the phasor diagram (power triangle)

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Electrical Heating Unit

The conversion of electrical energy to heat energy is known as electric heating. The heating system that converts the electrical energy to heat energy for various application is called electrical heating unit. Electricity is employed as the firing mechanism in electric heating systems, which transforms electric current to heat. Electric heaters have heating elements in the form of electric resistors.