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ANALISIS FASOR, FAKTOR DAYA, & 3 PHASE
Pertemuan III
DASAR SISTEM TENAGA
• Bilangan Kompleks
K = a + jb
• Metode Eulerejө = (cos ө + j sin ө)
• Bentuk PolarK = a + jb = |K| < ө = (a2 +b2)1/2 <tan-1(b/a)
Sinyal Sinus/Cosinus
• V(t) = Vm (Sin ωt)
= Vm < 0
• I(t) = Im . Sin (ωt + ø)
= Im < ø
Beban Resistif
• I(t) = Im . Sin (ωt + ø)
• V(t) = R I(t) = R Im Sin (ωt + ø)
• Vm = R Im
Tegangan sefasa dengan arus
Beban Induktif
• I(t) = Im . Sin (ωt + ø)• VL(t) = L dI(t)/dt
= ω L Im d/dt {Sin(ωt + ø)}
= ω L Im Cos(ωt + ø)
= ω L Im Sin(ωt + ø + 90o)
• VL(t) = ω L Im Sin(ωt + ø + 90o)
= Vm Sin(ωt + ø + 90o) = Vm<90o
• Vm = ω L Im Tegangan mendahului Arus
Beban Kapasitif
• V(t) = Vm . Sin (ωt + ø)• Ic(t) = C dV(t)/dt
= ω C Vm d/dt {Sin(ωt + ø)}
= ω C Vm Cos(ωt + ø)
= ω C Vm Sin(ωt + ø + 90o)
• IL(t) = ω C Vm Sin(ωt + ø + 90o)
= Im Sin(ωt + ø + 90o) = Im<90o
• Im = ω C Vm ARUS mendahului TEGANGAN
IMPEDANSI
• Z = R + j X = R + j (XL- XC)
• Bentuk Polar|Z| < ө = (R2 +X2)1/2 <tan-1(X/R)
Daya Rata-rata
• p = v.i
• Daya rata-rata = Vrms. Irms Cos ø
• Tegangan efektif =
Vrms = Vm/(2)1/2
• Arus Efektif =Irms = Im/(2)1/2
Daya Kompleks
• S = P + JQ = |S|<ө
• S = Daya Semu = Volt.Ampere = VA
• P = Daya Nyata/Aktif = Watt
• Q = Daya Reaktif = VAR