Two compound generator A and B fitted with an equalizing bar supply a total load current of 350 A. the data of the machines are. Ra (ohm) 0.02 0.01 Rse (ohm) 0.004 0.002 Generated emf(V) 220 225 Calculate (1) the busbar current and (1i) the terminal voltage Comment on your results
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- For the circuit shown in Figure 2.24, compute the voltage across the load terminals.EE 422 - AC and DC Machinery Solve the following problems completely. Box and Round-off your final answer in nearesttwo decimal places. 1.A long shunt compound generator delivers 100A,250V at rated load. The resistances of the various windings are: Ra = 0.1 ohm, Rip = 0.02 ohm, Rsh = 100 ohm and Rse = 0.025 ohm. If the stray power losses amount to 1.8kW, solve for the overall efficiency of the generator. answer: 86.36% 2. A motor is supplying 60 Nm of torque to its load. If the motor’s shaft is turning at 1,800 rpm, what is mechanical power to the load in horsepower? answer:15.2 hpElectric Machine-check image, all question there. Consider the above equivalent circuit of IM, A six pole, 250 volt(line to line), 60Hz, Y connected , three phase IM has the following parameters on a per phase basis: R1=0.125Ω , R2=0.45 Ω, X1=0.5 Ω, X2=0.75 Ω, Xm=50 Ω, Rc=225 Ω The friction and windage loss is 115 W. Determine the following at its rated slip of 1.5% a)Excitation Circuit b)Power developed by motor(Pd) c)Shaft Power(Pshaft) d)Shaft Torque(Tshaft) e)Efficiency
- Electric Machine - Check image, all question there. Consider the above equivalent circuit of IM, A six pole, 250 volt(line to line), 60Hz, Y connected , three phase IM has the following parameters on a per phase basis: R1=0.125Ω , R2=0.45 Ω, X1=0.5 Ω, X2=0.75 Ω, Xm=50 Ω, Rc=225 Ω The friction and windage loss is 115 W. Determine the following at its rated slip of 1.5% a)Excitation Circuit b)Power developed by motor c)Shaft Power(Pshaft) d)Shaft Torque(Tshaft) e)EfficiencyElectric Machine - check image , all question there. Consider the above equivalent circuit of IM. A six pole, 230 volt(line to line), 60Hz, Y connected , three phase IM has the following on a per phase basis: R1=0.5Ω , R2=0.25 Ω, X1=0.75 Ω, X2=0.5 Ω, Xm=100 Ω, Rc=500 Ω The friction and windage loss is 150 W. Determine the following at its rated slip of 2.5% a)Total Impedance(Zt) b)Rotor Copper Loss c)Core loss(Pm) d)Shaft Power(P0) e)EfficiencyA star connected three phase, 10 MVA, 6.6 kV, alternator is protected by Merz-price circulating current principle using 1000/5 amperes current transformers. The star point of the alternator is earthed through a resistance of 7.5Ω. If the min. operating current for the relay is 0.5A. Calculate the percentage of unprotected stator winding when machine is operating at normal voltage.
- Choose which answers are correct Which of the following is not an objective of Economic load Dispatch ? a . Loading should be optimum b . To get output power from all generators c . Minimizing the Total Operating Cost d . Meeting power demandTwo generators operating in parallel supplying a total load current of 160 A. The terminal volage of generator A falls from 246 Von no load to 230 V when the current output is 100 A; The terminal volatge of generator B falls from 250 V on no load to 230 Vwhen the current output is 80 A. The external characteristics are rectilinear. determine the:a) busbar voltage. b) Current delivered by the generator A.c) kW shared by generator AElectric Machine-check image, all question there. Consider the above equivalent circuit of IM. A three phase, Y connected , 215 V (line to line), 7.5Kw , 60Hz , three pole IM has the following parameter values in Ω/phase referred to the stator R1=0.294Ω , R2=0.144 Ω, X1=0.203 Ω, X2=0.409 Ω, Xm=10.25 Ω The total friction , windage and core losses may be assumed to be constant at 350W independent of load, For a slip s=0.02, compute the followings a)Stator current b)Power factor(pf) c)Rotor speed d)Power Output(shaft) e)Output(shaft) torque f)Efficiency
- A three phase,Y connected, 215 V (line to line), 7.5 kW, 60 Hz, three pole IM has the following parameter values in Ohm/phase referred to the statorR₁ = 0.294 Ohm, R₂ = 0.144 Ohm, X₁ = 0.203 Ohm, X₂ = 0.409 Ohm, Xm = 10.25 Ohm.The total friction,windage and core losses may be assumed to be constant at 350 W independent of load. For a slip s = 0.02, compute the followingsa) Stator Currentb) Power Factor(pf)c) Rotor Speedd) Power Output(Shaft)e) Output(Shaft) Torquef) Efficiency(n)The electrical power supply system of a particular country is made of the following. Draw asingle line diagram of the electrical power supply system of the country based on the informationbelow using any computer-aided software.Power supply from an infinite bus bar S connected to bus bar A, through a circuit breakerconnected between isolators and a three-phase delta/star solidly earthed transformer T1.Powersupply source from a generator G1 connected to bus bar B through a circuit breaker connectedbetween isolators, and a three- phase delta/star solidly earthed transformer T2. power supplysources from two generators G2 and G3. Each of the generators are connected to a reactor.Furthermore, each of the generators connected to a common bus bar C through a circuit breakerconnected between isolators and a three-phase star/star solidly earthed transformer T3 and T4respectively. bus bar F to bus bar A by means of two isolators, one at each end of transmissionline L6; bus bar A to bus bar E by…A three-phase, 3-wire, 120V, 60Hz, delta connected AC generator is applied to abalanced load having a resistance of 5Ω and 530.5µF in parallel. Find the phasecurrents.