# Transmission And Distribution - 5th ND10 EE2303

B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2010
Fifth Semester
Electrical and Electronics Engineering
EE 2303 — TRANSMISSION AND DISTRIBUTION
(Regulation 2008)

Programming Questions  |  Travel Tips | Mobile Review | Placement Papers

PART A — (10 × 2 = 20 Marks)

1. State the disadvantages of HVDC transmission.
2. Which factors affect sag in the transmission line?
3. Define skin effect.
4. What are the advantages of using bundled conductors?
5. What is Ferranti effect?
6. What is shunt compensation?
7. Define string efficiency.
8. What is the necessity of grading of an under ground cable?
9. List the various substation equipments.
10. Why are transmission lines 3 phase 3 wire circuits while distribution lines are 3 phase 4 wire circuits?

PART B — (5 × 16 = 80 Marks)

11. (a) Discuss in detail the various equipments used in HVDC converter station.
Or
(b) An overhead line has a span of 336 m. The line is supported ,at a water Crossing from two towers whose heights are 33.6 m and 29 m above water level. The weight of conductor is 8.33 N/m and tension in the conductor is not to exceed 3.34 × 104 N. Find (i) Clearance between the lowest point on the conductor and water (ii) horizontal distance of this point from the lower support.

12. (a) Derive the expression for inductance of a three phase line with unsymmetrical Spacing.
Or
(b) A 220 KV, 50 Hz, 200 Km long three phase line has its conductors on the corners of a triangle with sides 6 m, 6m and 12 m. The conductor radius is 1.81 cm. Find the capacitance per phase per km, capacitive reactance per phase, charging current and total charging Mega volt-amperes.

13. (a) What is a nominal ? (pi) circuit? Find the ABCD constants for nominal ? Circuit.
Or
(b) Write short notes on :
(i) Shunt compensation. [Marks 8]
(ii) Series compensation. [Marks 8]

14. (a) Discuss briefly on the following :
(i) Pin Type insulator. [Marks 8]
(ii) Suspension Type insulator. [Marks 8]
Or
(b) Derive the expression for the Insulation resistance, capacitance, Electric stress and dielectric loss of a single core cable.

15. (a) Explain briefly the various types of bus bar arrangements in a substation.
Or
(b) Discuss briefly each of the following :
(i) Feeders. [Marks 4]