ELECTRIC MACHINERY (6TH EDITION): PART 2

A lecture for electric power machinery A lecture for electric power machinery A lecture for electric power machinery A lecture for electric power machinery A lecture for electric power machinery A lecture for electric power machinery A lecture for electric power machinery A lecture for electric powe[r]

_d _ A MATLAB program to calculate and plot the motor’s V-curve is shown below: % M-file: prob6_2d.m % M-file create a plot of armature current versus Ea % for the synchronous motor of P[r]

Many of the problems in Chapters 2, 5, 6, and 9 require that a student read one or more values from a magnetization curve. The required curves are given within the textbook, but they are shown with relatively few vertical and horizontal lines so that they will not appear too cluttered. El[r]

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(BQ) Part 2 book Organic chemistry has contents: Functional derivatives of carboxylic acids, enolate anions and enamines; benzene and the concept of aromaticity; reactions of benzene and its derivatives; catalytic carbon carbon bond formation; carbohydrates,...and other contents.

(d) Calculate the real power P and reactive power Q supplied or consumed by the machine under the
conditions in part (c) . Is the machine operating within its ratings under these circumstances?
S OLUTION
(a) This machine is a generator supplying real power to the power sy[r]

05 MVA ( 10 MW ) 2 2
12.6 M =
VAR
Now we must determine the rotor current limit. The per-unit power supplied to the motor is 10 MW / 16.05 MW = 0.623. The maximum E A is 5067 V or 1.33 pu, so with E A set to maximum and the motor[r]

The MATLAB program to solve this problem is shown below: TRANG 7 % M-file: prob6_4.m % M-file create a plot of armature current versus field % current for the synchronous motor of Proble[r]

Each generator will supply 96.7 MW to the loads.
5-26. Suppose that you were an engineer planning a new electric co-generation facility for a plant with excess process steam. You have a choice of either two 10 MW turbine-generators or a single 20 MW turbine generator. What wo[r]

508 V. The approximate saturated synchronous reactance X S is
E A ) is 880/ 3 =
3 If you have MATLAB available, you can use the file p52_scc.dat and the interp1 function to look up this value as shown below. Note that column 1 of p52_scc contains field current, and column [r]

( ) =
1 2 P P 1 P s nl1 f sys f 2.5 MW/Hz 61 Hz 59.23 Hz 4.425 MW
The total power supplied by the generators at this condition is 14.16 MW.
(c) To get each of the generators to supply 5.31 MW at 60 Hz, the no-load frequencies of Generator 1 and Generator[r]

The resulting capability diagram is shown below:
5-3. Assume that the field current of the generator in Problem 5-2 has been adjusted to a value of 4.5 A.
(a) What will the terminal voltage of this generator be if it is connected to a -connected load with an impedance of 20[r]

(2) Now, apply a pulse to transformer T 1 that turns on SCR 1 . When that happens, the circuit looks like:
Since the top of the transformer is now grounded, a voltage V DC appears across the upper winding as shown. This voltage induces a corresponding voltage on the lower half of th[r]

5-4. Assume that the field current of the generator in Problem 5-2 is adjusted to achieve rated voltage (2300 V) at full load conditions in each of the questions below.
(a) What is the efficiency of the generator at rated load?
(b) What is the voltage regulation of the generator if it[r]

SCR 2 will cut off when the capacitor is fully charged. Alternately, it will be cut off by the voltage across the capacitor if SCR 1 is triggered before it would otherwise cut off.
In this circuit, SCR 1 controls the power supplied to the load, while SCR 2 controls when SCR[r]

2-10. A 13,800/480 V three-phase Y- ∆ -connected transformer bank consists of three identical 100-kVA
7967/480-V transformers. It is supplied with power directly from a large constant-voltage bus. In the short-circuit test, the recorded values on the high-voltage side for one of these t[r]

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(c) Starting from the conditions in part (b) , the field current in the dc machine is now decreased by 1 percent. What effect does this change have on the real power supplied by the motor-generator set? On the reactive power supplied by the motor-generator set? Calculate the real and r[r]

24 Machinery Component Maintenance and Repair
Although many quantitative methods exist for justifying computer- based systems in the maintenance area, many such systems are justified by what is called the “faith, hope, and charity” method. Maintenance management sim[r]

(d) What is the efficiency of the motor at full load?
(e) If the motor is now unloaded with no changes in terminal voltage or R adj , what is the no-load speed of the motor?
(f) Suppose that the motor is running at the no-load conditions described in part e . What would happen to the mo[r]