a) What is power transfer limit of a long transmission line? List two methods that can be used to increase the power transfer limit of a long transmission line. Explain why. [2 p]
b) If a two-winding transformer shown in Fig. 1 is reconnected as an autotransformer, the rated power is increased. Explain why. [3 p]
Fig. 1 A two-winding transformer.
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a) What is power transfer limit of a long transmission line? List two methods that can...
Q-1 A 60Hz, 480V/240V,960V A transformer is supplying a 960W passive load at 240V. The resistances of the primary side and secondary side of the transformer are 1.092 and 0.252 respectively. If the no load losses of the transfomer is given by P-Vã 4800 W where Vn is the input voltage of the transformer in Volt. Answer the following: a) Calculate transformer efficiency b) Do you allow this transformer to be connected to 240V 50Hz distribution system? Explain. c What...
1. If 480 volts is applied to the primary winding of a transformer which has 300 turns in the primary winding and 15 turns in the secondary winding, the secondary voltage will be A. 0.0417 volts. C. 56.8 volts B. 24 volts. D. 9600 volts. 2. A distribution transformer with a grain-orientented steel core is highly efficent because its A. exciting current is sufficiently high. B. flux direction is parallel to the stell-rolling direction C. permeability is increased due to...
QUESTION 2. (a) A portion of a power system consists of two generators in parallel, connected to a step-up transformer that links them with a 220-kV transmission line. The ratings of these components are as shown below: Generator GI: 10 MVA, 12 percent reactance Generator G2: 5 MVA, 8 percent reactance Transformer: 15 MVA, 6 percent reactance Transmission line: (4+j60) 22, 220kV where the percent reactances are computed on the basis of individual component ratings. Draw the per-unit impedance diagram...
do it in Matlab
Q2 (Newton-Raphson Power Flow Solution with FACTS Devices Consider a two-bus system with the single-line diagram shown in Fig. 2. In the two bus system, Bus is slack bus where voltage is given: V 1.03 +j0.0 p. u. Bus 2 is a PQ bus where load power is given in p.u.. The impedance of the transmission line between bus 1 and bus 2 is 212-0.0+ j0.15 p.u. A STATCOM is connected at bus 2 through a...
3. (30) A simple power system, shown below, is made up of a synchronous generatcr connected to a synchronous motor through a couple of transformers and a transmission line. The reactances of the different elements of the system are all given in pu as: Xsg-0.5 X of each transformer-10 % Xsm-0.5 X transmission line 0.3 The synchronous motor is connected to an infinite bus Hint: The great advantage of an infinite bus is that it always remains constant and our...
Two three-phase power transmission lines with a nominal
operating voltage of 220 kV and a frequency of 60 Hz are connected
in series as shown below.
Per-phase constants of the first 110 km long energy transmission
line (E.İ.H.-1); r = 0.01035Ω / km, L = 1.554 mH / km, and C =
7.387 ∙ 10-3 µF / km. Constants per phase of the second 100 km long
energy transmission line (E.İ.H.2); Zh = 1.035 + j58.58 Ω / phase
and...
Problem 3 a- List five different transformer types used in the electric power system. [5 points] Consider a three-winding transformer, as shown in Figure 1, with the following particulars Ze 0.01+j 0.08 V2-440 z,= 0.01 tj 0.08 2-100/-25 Z- 0.01 +j 0.08 s-80/-35° Assume that V2 is the reference phasor, calculate: (a) The intermediate voltage Vo (3 points) (b) The primary current l and the primary voltage V. (3 points) (c) The tertiary voltage Vs referred to the primary side....
power system
A single-circuit 60-Hz high voltage power transmission line is 370 km (230 mi) long. The conductors are Rook with flat horizontal configuration and 7.25 ms=(23.8 ft.) conductor spacing. The load on the line is 125 MW at 100% power factor. Use attached Tables A3 to A3to determine; The sending end voltage Vs The sending end current Is The sending end power Ps The percentage voltage regulation The transmission efficiency Given that Ds for the Rook conductor is 0.0327...
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10. The hysteresis loss in the core of a transformer can be reduced by A. increasing the frequency of the aliemating current, B. using a solid iron core. C. using grain-oriented-steel D, reducing the connected load. 11. In Fig. 1(b) in the text, the phasor I, It is the resultant of the A. exciting and the magnetizing current. B. active and the reactive secondary current. C. primary and the exciting current. D....
Assuming c-3× 〖10] ^8m/sec, what is the highest length of the power transmission line, you can model without invoking concepts of transmission line? State your assumptions explicitly