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A paper mill has installed three steam generators (boilers) to provide process steam and also to use some its waste products as an energy source. Since there is extra capacity, the mill has installed three 10-MW turbine generators to take advantage of the situation. Each generator is a 4160-V, 12.5 MVA, 60 Hz, 0.8- PF-lagging, two-pole, Y-connected synchronous generator with a synchronous reactance of 1.10 W and an armature resistance of 0.03 W. Generators 1 and 2 have a characteristic power-frequency slope of 5 MW/Hz, and generator 3 has a slope sP of 6 MW/Hz.
(a) If the no-load frequency of each of the three generators is adjusted to 61 Hz, how much power will the three machines be supplying when actual system frequency is 60 Hz?
(b) What is the maximum power the three generators can supply in this condition without the ratings of one of them being exceeded? At what frequency does this limit occur? How much power does each generator supply at that point?
(c) What would have to be done to get all three generators to supply their rated real and reactive powers at an overall operating frequency of 60 Hz?
(d) What would the internal generated voltages of the three generators be under this condition?
The turns ratio (n3/n1) is chosen such that the converter produces the required output voltage at a transformer duty cycle of D=0.4. For each case determine numerical values for the turns ratio n3/n1 and for the efficiency.
A 300 kW, 6600 V, 8-pole, 50 Hz, three-phase, Y-connected, non-salient pole (i.e., cylindrical rotor) synchronous motor has the following parameters: Xs = 72 ohm /phase at 50 Hz, R =10 ohm/phase for operation near base speed, and Efo = 3200 V/phase..
Design an inverting amplifier with a gain of -20. Use R1 = 5.1k ohms. input of 0.5V amplitude, 1KHz sine wave and obtain plots of input and output on the same plot. Repeat for a 4V amplitude input.
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All of us know that an automatic iron box set at "silk" will get heated upto a particular value, and if it is set at "wool"' iron box will get heated upto a higher value. Draw a block diagram representing the control system.
Design the system which finds the most popular (one most often generated) symbol called winner in each block of 32 input symbols. The system reports the number of winners and their value. Use only 2 data inputs multiplexers and shift registers.
smoke detector was loaded with 0.2u Curie when purchased 20 years ago. The isotope is Am-241with a half-life of 426 years. How much remains today
Find the output of the generator in watts.
If the breakdown voltage increases with temperature at a rate of 40 mV/"C, find the break-down voltage of the diode at room temperature, assuming that the space-charge resistance is 10 C& independent of temperature.
Explain conditions for Rigid-Body Equilibrium with relevant diagrams.
Find the value of k that makes this function a probability density function. Find P(Y1 ≥ 3Y2). That is, find the probability that the cleaning device reduces the amount of pollutant by one-third or more.
Calculate the length and the distance coved by the lightening arrestor to be installed above 20 feet height industrial building.
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