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TRANSMISSION AND DISTRIBUTION - Part Time Eng - Question Bank
#1


Anna University
DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING

QUESTION BANK
TRANSMISSION AND DISTRIBUTION

BE-EEE-(PT)
II year – III Semester

Note : This Question Bank is for Part Time B.E EEE Students.

UNIT I - INTRODUCTION
PART-A

1. What is the difference between transmission and distribution?
2. What are the constituent sections of the power system?
3. Define FACTS.
4. Distinguish between feeder and distributor.
5. What is the highest a.c. transmission voltage we have in India?
6. Give four advantages of EHVAC transmission.
7. List two merits of HVDC transmission system.
8. Compare overhead and underground system.
9. Give Abbreviations of TCSC and UPFC.
10. Give any two applications of HVDC Transmission System.

PART-B

1. With a neat sketch, explain the structure of a general transmission and distribution system.
2. Discuss the technical and economical advantages of DC systems over AC systems.
3. Write short notes on
i) STATCOM ii) SVC
4. Discuss about the types of distribution system
5. Explain the principle of HVDC. Mention its advantages and disadvantages

UNIT – II
TRANSMISSION LINE PARAMETERS


PART A

1. Define resistance of a transmission line.
2. Define skin effect.
3. State two advantages of bundled conductors.
4. What are the factors which are responsible for skin effect.
5. Define the term “Interference with neighboring circuits”.
6. Define GMR of a conductor.
7. Define GMD of a conductor.
8. What is Transposition of power conductors
9. Find the expression for flux linkages of a conductor due to internal flux.
10. What is proximity effect?

PART B

1. Derive the expression for the flux linkages due to
i) Single current carrying conductor.
ii) Parallel current carrying conductor.

2. Derive the expression for the inductance of a three phase over head transmission line with
i) Symmetrical spacing
ii) Unsymmetrical spacing

3. Derive the expression for the capacitance of a three phase over head transmission line
i) Symmetrical spacing
ii) Unsymmetrical spacing

4. Explain the concept of self GMD and mutual GMD.

5. Discuss about bundled conductors.


UNIT – III
MODELLING AND PERFORMANCE OF TRANSMISSION LINES


PART A

1. Give the classification of transmission lines in terms of distance.
2. Define short transmission line.
3. Define regulation of a transmission line.
4. What is surge impedance loading?
5. Define transmission efficiency.
6. What is power-angle diagram?
7. Give formula for surge impedance.
8. What is Corona loss in transmission lines
9. Draw the representation of transmission line using nominal T method parameters.
10. Explain the term “Ferranti effect”.


PART B

1. Explain the procedure for determining the transmission efficiency and voltage regulation of a short transmission line
2. A single phase overhead transmission line delivers 1100kw at 33kv at 0.8 p.f. lagging. The total resistance and inductive reactance of the line are 10Ω and 15Ω respectively. Determine
(i) Sending end voltage.
(ii) Sending end power factor.
(iii) Transmission efficiency.

3. Derive an expression for transmission efficiency and regulation of medium line
(i) Nominal T method
(ii) Nominal Π method

4. Derive an expression for sending end voltage and sending end current for long transmission line using Rigorous method.

5. Explain in detail the theory of corona formation and its advantages in power system. Also give the expression for corona power loss.



UNIT IV
INSULATORS AND CABLES


PART A

1. Define string efficiency
2. Write the formula for the capacitance of the single core cable.
3. What is grading of a cable?
4. Name the methods to improve string efficiency.
5. What are the different types of insulators?
6. Define thermal resistance of a cable.
7. Define safety factor.
8. What are the various types of cables?
9. What are the different insulating materials used for cables?
10. What are the advantages of suspension type of insulator?

PART B

1. Describe the different types of insulators
2. i) Give the properties of good insulator
ii) Explain the cause of insulation failure.
3. Explain about the methods used for improving string Efficiency.
4. Explain about the Potential Distribution over suspension Insulator string, and Derive Mathematical expression to calculate the string efficiency
5. An insulator string consists of three units, each having a safe working voltage of 15 KV. The ratio of self capacitance to shunt capacitance of each unit is 8: 1. Find the maximum safe working voltage of the string. Also find the string efficiency
6. Explain the constructional feature of LT and HT cables

UNIT - V
SUBSTATION, GROUNDING SYSTEM AND DISTRIBUTION SYSTEM


PART A

1. What are the main advantages of radial system?
2. Mention any two types of substations.
3. What is an isolator?
4. What is neutral grounding?
5. Give the significance of inter-connectors.
6. What are the types of distribution systems?
7. Draw the schematic of Ring main distribution system.
8. Define ring bus.
9. Compare 3-phase 3-wire with 3-phase 4-wire system
10. Draw the schematic of Radial distribution system.


PART B

1. Discuss in detail with neat schematics about various types of distribution system
2. Explain briefly the types of substations.
3. Explain in detail the design principle of substation grounding system
4. Write short notes on
a. Neutral Grounding
b. Stepped and tapered mains
5. Explain about Double bus with breaker scheme system.

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