Α 3-φ, 440V supply is provided, and the factory consumes 150kW of power at 0.7 lagging power factor. What value of capacitor should be connected in Star/Delta to improve the power factor to unity?

3-φ, 440V সরবরাহ দেয়া আছে, কারখানায় 0.7 ল্যাগিং পাওয়ার ফ্যাক্টরে 150kW পাওয়ার গ্রহণ করে। পাওয়ার ফ্যাক্টর এককে উন্নীত করতে হলে কত মানের ক্যাপাসিটর Υ/Δ-তে সংযোগ করতে হবে?

Maximum Power Transfer Theorem :

In electrical engineering, the maximum power transfer theorem states that, to obtain maximum external power from a power source with internal resistance, the resistance of the load must equal the resistance of the source as viewed from its output terminals.

For t<0, the switch is closed.

Capacitor acts as open to DC.

Voltage across the capacitor,

     v(0^-)= {(12||4)×V}÷{(12||4)+6} = 8VFor t=0, the switch is opened,Voltage across the Capacitor cannot change instantaneously,So, v(0^-)= v(0) = 8VAt t>0, The capacitor is discharging.R_th = (12||4) = 3 ohmC= 1/6 FTime constant, Π = R_th×C = 0.5 So, v(t) = v(0)e^-t/Π  = 8e^-t/0.5 =8e^-2t V (Ans.)