Shivaji University 2010 B.E T.E(Electrical)- (Sem.- V) (New ), Power System Analysis - Question Paper
This is repeater ques. paper for the 3rd year electrical engineering students.
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T.E, (Electrical) (Sem, - V) (New Course) Examination, 2010 POWER SYSTEM ANALYSIS
Day and Date: Tuesday, J 5 -5* 201 O' Total Marks: 100
Time: 10,00 a,ni. to 1 .00 p.m.
instructions: i) Attempt any three questions from, each Section.
2} Figures to the right indicate full marks.
3} Moke suitable assumptions whenever necessary,
SECTION - I
I. A) Derive an expression of inductance for single phase two-wire Hne.
8
B) The incoming circuit of a single phase transmission line as shown in fig. I (b) consists of three wires of 0.3 cm radius, The outgoing circuit consists .of two wires of 0.4 cm radius. Calculate the inductance of the complete line. 8
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fig 1 (b)
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2. A) A single phase a.c distributor AB 300 m long is fed from end A and is loaded as
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100 A at 0.707 p.f lagging 200 m from point A and 200 A at 0.8 p,f. lagging 300 m from point A,
The load resistance and reactance of the distributor is 0.2& and 0.1Q per km. Calculate die total vtg, drop in the distributor. The load power facto vs refer to the voltage at the far end. 8
B) What is circuit breaker ? Describe its operating principle. S
3. A) Derive an expression of sag of the transmission line, 8
B) What is string efficiency of suspension type insulator ? Deduce an expression for the potential distribution over a string of suspension insulator. 8
4. Write a short notes {any three) : 18
a) Skin and proximity effect,
b) Pin type ins Qiasor,
c) Single line diagram of power system,
d) Conductor materials.
SECTION - II
5. A) Determine regulation and transmission efficiency for medium line using
nominaj - T method with suitable vector diagram. 8
B) A 132 kV, 50 Hz, 3 phase transmission line delivers a load of 50 MW at 0.8 p.f lagging at the receiving end. The generated constants of line
A D = 0.95
B =96/78*
C = 0-0015 ,/90d.
Find the regulation of the line and charging current, use nominal k method.
8
6, A) From system shown in fig. 6 (a). Construct theY8us. The parameters for various
bus arc given m cable, table 6 (a). 9
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fig. 6 (a) | |||||||||||||||
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3 - 4 0,05 | 0A5 Table 6 {?,') |
B) Derive the equation for static load flow using Gauss-Seidal method. 9
7, A) Ex p la in di ffcreat m e thods of i ay :ing of cabl es. S
B} Write a brief note on oiJ-filled cables, 8
8- A) Derive the expression of complex power through transmission Sine. 8
B) Discuss any two methods for improvement of power factor. 8
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Attachment: |
| Earning: Approval pending. |
