pole, 50Hz, 11KV, turbo generator is rated 100 MW and 0.85 power factor lagging. The machine rotor has a moment of inertia of 9000Kg-m². Find the inertia constant in M
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A 4-pole, 50Hz, 11KV, turbo generator is rated 100 MW and 0.85 power factor lagging. The machine rotor has a moment of inertia of 9000Kg-m². Find the inertia constant in MJ/MVA and the momentum in MJ-s / elec.degree
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- The following equation provides the relationship between the electrical frequency and the rotational speed of a generator; the standard for electrical frequency in Canada is 60 Hz. f = nm * P / 120 Where: f = Electrical frequency (Hz) nm = Rotor speed in revolutions per minute (rpm) P = Number of poles If a generator has 6 poles, what would be the rotor speed, nm, for a generator located in Canada? Select one:a. 1800 rpmb. 2400 rpmc. 1200 rpmd. 600 rpmIn a DC motor with separately excited configuration, EMF voltage=D10xrotational speed of the rotor (or w). In addition, the resistance and the inductance of the armature are 5 Ohms and 200 mH, respectively. la and Va represent current and voltage of the armature and fit to the following transfer function: la/(Va+pxw)%3Dq/(s+r). What is r?How many poles should a 60-Hz generator have, if it is connected to a turbine operating undera design head of 3000 ft with a flow of 82 cubic feet per second? Assume turbine specific speedand efficiency of 3 rpm and 84% respectively.
- Find the power involved in a rotational motion associated with a torque of 25 N·m when the rotational speed is 70 rpm (that is, the rotational speed is 70 revolutions per minute). Hint: Look carefully at the units and first convert the rotational speed units to radians/second (rad/s).With increasing load current, the output voltage of a separately-excited DC generator falls, which is a property of its load characteristics (decreasing load resistance). As the load current grows, what is the most appropriate solution or action you can take to counteract this voltage drop and keep the output voltage at a consistent level? Note: Please explain in no more than 60 words.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.
- A 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.)A lap wound dc generator having 50slots with 15conductors per slot generated at no led emf of 400v when running at 1000 rpm suppose if the same generator is desired to genate 220v on open circuit. Suggest the speed at which it has to be rotatedA dc shunt generator 50 V at the load 6A, rotating 700 r.p.m at the torque 4 N.m. Find the efficiency of generator?
- no more than 50 words. Between a separately-excited and a self-excited DC generator, which is simpler to construct and why?In a DC motor with separately excited configuration, EMF voltage=8xrotational speed of the rotor (or w). In addition, the resistance and the inductance of the armature are 10 Ohms and 500 mH, respectively. la and Va represent current and voltage of the armature and fit to the following transfer function: la/(Va+pxw)%=q/(s+r). What is p?A horizontal- axis wind turbine with a 20-m diameter rotor is 30% efficientin10m/s winds at 1atm of pressure and15◦C temperature.a.How much power would it produce in those winds?b.Estimate the air density on a 2500-m mountaintop at10◦C?c.Estimate the power the turbine would produce on that mountain with thesame wind speed assuming its efficiency is not affected by air density