A 100 MVA,2 pole,50 Hz generator has a moment of inertia 40X103 Kg-m². (a) What is the energy stored in the rotor at the rated speed? (b) What is the corresponding momentum? (c) Determine the inertia constant.(H).
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- With the aid of mathematical expressions where necessary, explain the following terms with respect to squirrel cage induction motorsi. Stray Lossesii. Air gap Poweriii. Rotational lossesiv. Friction and Windage lossesv. Stator Copper lossesvi. Rotor Copper lossesvii. Mechanical LossesWith the aid of mathematical expressions explain the following terms with respect to squirrel cage induction motorsi. Stray Lossesii. Air gap Poweriii. Rotational lossesiv. Friction and Windage lossesv. Stator Copper lossesvi. Rotor Copper lossesvii. Mechanical LossesA 20KW, 440V, short shunt compound dc generator has full load efficiency of 87%. If the resistance of the armature and interpoles is 0.4ohm and that of the series and shunt fields 0.25ohm and 240ohms respectively, calculate the combined bearing friction, windage and core loss of the machine A 10 kW 250 volts self-excited generator, when delivering rated load, has an armature-circuit voltage drop of 5% of the terminal voltage and a shunt field current equal to 5% of the rated load current. The resistance of the armature is 0.02 ohm. Calculate the voltage generated and power output.
- b. With the aid of mathematical expressions where necessary, explain the following terms with respect to squirrel cage induction motorsi. Stray Lossesii. Air gap Poweriii. Rotational lossesiv. Friction and Windage lossesv. Stator Copper lossesvi. Rotor Copper lossesvii. Mechanical LossesA 3 phase 4MVA, 12 kV star connected synchronous generator has Zs= 0.8+J30 ohm. Using circle diagram only, find: 1. The output power developed at unity power factor with excitation equal to 1.25 of rated voltage. 2. The load angle and power factor if the generator supplies (1500 KW) at rated voltage and excitation lequal to (1.2) of rated voltage. 3. Repeat part (2) when .armature resistance is neglectedA triangle connected, round rotor synchronous generator with Xs= 15 Ohm, Ra=0 works in parallel with a network with 400 V interphase voltage and gives only P= 62700 W active power. Find the amplitude of the induced internal electromotive force "Ef" and how many degrees the charge angle is. (It will be assumed that the generator is not overloaded, magnetically linear, no saturation, mechanical losses are neglected, and the armature internal resistance Ra is neglected.) (three digits after the comma.)
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- The flux density distribution in the airgap of a 60Hz,4-pole, salient pole machine is sinusoidal, having an amplitude of 0.8 T. Calculate the instantaneous and rms values of the voltage induced in 1150-turn, If the axial length of the armature and its inner diameter are both 100 mm.Determine the kinetic energy stored by a 250 MVA, 60 Hz, two pole synchronous generator withan inertia constant H of 5.4 MJ/MVA. Assume the machine is running steadily at synchronousspeed with a shaft input of 331,100 hp. The electrical power developed suddenly changes from itsnormal value to a value of 200 MW. Determine the acceleration or deceleration of the rotor. If theacceleration computed for the generator is constant for a period of 9 cycles, determine the changein power angle in that period and the rpm at the end of 9 cycles.A 100 MVA,2 pole,50 Hz generator has a moment of inertia 40X103 Kg-m2. (a) What is the energy stored in the rotor at the rated speed? (b) What is the corresponding momentum? (c) Determine the inertia constant.(H). A 100 MVA,2 pole,50 Hz generator has a moment of inertia 40X103 Kg-m2. (a) What is the energy stored in the rotor at the rated speed? (b) What is the corresponding momentum? (c) Determine the inertia constant.(H).