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?

Question

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?

Satt Academy · Accepted Answer

θ1=cos-1(0.7)=45.57° θ2=cos-1(1)=0°kW = 150 kWkVAR=kW tan θ = 150 tan 45.57০ = 153 kVAR kVAR/phase = 1533 51 KVAR = 51000 VARWhen Delta ConnectedVAR = v2xc C = V2VAR = 440251000 = 3.7960When star connectedVAR = v2xc C = V2VAR = 254251000 1.265 Ω C=12 πfxC=12π × 50×1.265=25.2×10-4 F

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ইলেকট্রিক্যাল এন্ড ইলেকট্রনিক্স ইঞ্জিনিয়ারিং

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