A synchronous generator supplies rated power at 0.8 pf lagging.ra 0.015p. u., andxl = 1p.u. . Find out the possible terminal voltage. In case of the practical operation, which terminal voltage is more feasible? =
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- Two alternators rated 400 MW and 600 MW are operating in parallel. The droop characteristics of their governors are 3% and 4% respectively from no load to full load. Assuming that the alternators are operating at 50 Hz at no load, how would a load of 1000 MW be shared between them? What will be the system frequency at this load? [Ans. G1 = 468.132 MW, G2 = 531.669 MW, f= 48.296 Hz]Draw voltage phasor diagrams for different load cases of salient synchronous generators and derive the expression of the induced voltage.Which of the following is true in the phasor diagrams drawn according to the ohmic, inductive and capacitive operating states of the round pole synchronous generator a) Due to the voltage Efd, the excitation current is large in capacitive operation and small in ohmic operation b) Due to the voltage Efd, the excitation current is large in ohmic operation and small in inductive operation c) Due to the voltage Efd, the excitation current is small in capacitive operation and large in inductive operation. d) Due to the voltage Efd, the excitation current is large in capacitive operation and small in inductive operation.
- An 11 kV, three-phase, turbo alternator has a synchronous impedance per phase of(0,4 + j0,8) Ω and it supplies 2 kA at unity power factor to an infinite bus. Theexcitation is increased so that the emf is increased by 20%. Sketch a general loaddiagram and determine the following from this diagram: the armature current for maximum power output, the actual maximum power outputTwo alternators rated 400 MW and 600 MW are operating in parallel. The droopcharacteristics of their governors are 3% and 4% respectively from no loadto full load. Assuming that the alternators are operating at 50 Hz at noload, how would a load of 1000 MW be shared between them? What will be thesystem frequency at this load?please answer this question within 30 minutes. i will upvote. In a series RLC circuit with resistance ? and impedance ? , the rms value of the generator emf is ?rms and the rms value of the current is ?rms . The current lags the emf by ? . The average power supplied by the generator is given by which formula ? Show Mathematically.
- Discuss about generator modeling and drive the formula for the real and reactive power supply it .A 80 MVA synchronous generator has Xs = j8Ω. The generator is supplying itsrated power to an infinite bus at a voltage of 33KV and a power factor of 0.9lagging.Determine the following:a) The generator emf (E) and the power angle.b) The maximum power (Pmax) that the generator can supply and the armaturecurrent (Ia) in this case (i.e. when the power is maximum) and what is thepower factor?Derive current, active and reactive power equations of a three-phase synchronous generator along with phasor diagram.
- L-type equivalent circuit and parameters for a continuous sinusoidal phase of a 5.5 kW, 1450 rpm, line voltage 220 V and frequency 50 Hz star-connected 3-phase ASM, ignoring core (iron) losses given as follows: R1=0.21 Ohm, R2=0.18 Ohm, X1=X2=0.66 Ohm and Xm=9.9 Ohm How many times the rated current will the inrush current be when the ASM is started directly?A 3-phase, wye connected alternator rated at 1600 kVA, 13.5 kV. The effective armature resistance and synchronous reactance are 1.5 ohms and 30 ohms, respectively. What is the percent regulation for a load of 1280 kW at 0.80 leading power factor?L-type equivalent circuit and parameters for a continuous sinusoidal phase of a 5.5 kW, 1450 rpm, line voltage 220 V and frequency 50 Hz star-connected 3-phase ASM, ignoring core (iron) losses given as follows: R1=0.21 Ohm, R2=0.18 Ohm, X1=X2=0.66 Ohm and Xm=9.9 Ohm How many times the inrush current will be the rated current when the ASM is started directly?