Question Solved1 Answer The answer for (b) should be : Generatedvoltage Eaf = 578.05 exp(j9.75°) 3. A 800 V, 120kVA, 3-phase, 50 Hz, salient-pole synchronous generator is used in a hydroelectric dam, converting water flow into electricity via a turbine. The reactance values (Xd and XQ) are 1.95 1 and 1.102, respectively and the terminal current is measured to be 95 A at a power factor of 0.85 lagging. The armature resistance can be considered to be negligible (Rg = 0). a) Draw the phasor diagram of the generator, b) Compute the generated voltage (af) when the generator delivers its rated kVA at 0.85 lagging power factor and rated terminal voltage. 10 15

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The answer for (b) should be : Generated voltage Eaf = 578.05 exp(j9.75°)

Transcribed Image Text: 3. A 800 V, 120kVA, 3-phase, 50 Hz, salient-pole synchronous generator is used in a hydroelectric dam, converting water flow into electricity via a turbine. The reactance values (Xd and XQ) are 1.95 1 and 1.102, respectively and the terminal current is measured to be 95 A at a power factor of 0.85 lagging. The armature resistance can be considered to be negligible (Rg = 0). a) Draw the phasor diagram of the generator, b) Compute the generated voltage (af) when the generator delivers its rated kVA at 0.85 lagging power factor and rated terminal voltage. 10 15
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Transcribed Image Text: 3. A 800 V, 120kVA, 3-phase, 50 Hz, salient-pole synchronous generator is used in a hydroelectric dam, converting water flow into electricity via a turbine. The reactance values (Xd and XQ) are 1.95 1 and 1.102, respectively and the terminal current is measured to be 95 A at a power factor of 0.85 lagging. The armature resistance can be considered to be negligible (Rg = 0). a) Draw the phasor diagram of the generator, b) Compute the generated voltage (af) when the generator delivers its rated kVA at 0.85 lagging power factor and rated terminal voltage. 10 15
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(1)Given Data,A Sailent-pole syhchronous generator,feminal vottege V_(L-L)=800V," rated "kVA=120kVAsynchronousdirect axis reactance xd=1.95 OmegaQuadrature axis synctronous reactance xq=1.10 Omegaferminal current i.e almature current I_(a)=95A.powerfactor Cos phi=0.85 lagging.amature resistance (R_(a)=0).a) phagr diagran for sailent pole altechator with (Ra=0)-:(b) Srom the phasor diagram, for lagging P.f loadpsi=phi+deltawhere, psi= Internal power fueter angle between Eand ITphi= load power factor angle between Vand Iqdelta=load (or ponerangle between E andr.I_(d)=I_(a)sin psi=> direct axis almature cureentI_(q)=I_(a)cos psi=> quadrature axis almature currenttan varphi=(V_(ph)sin phi+-Ia xx q)/(V_(ph)co ... See the full answer