# EE2303 Transmission And Distribution Important Questions

**1. Explain about FACTS and its controllers with neat diagram.**

**2. Draw and explain the structure of modern power systems with typical voltage levels.**

**3. (i) What are the different kinds of DC links? Draw relevant diagrams. (8)**

**(ii) Compare EHVAC and HVDC transmission (8)**

**4 Derive an expression for sag calculation in a transmission line**

**(i) When the supports are at equal heights (8)**

**(ii) When the supports are at unequal heights(8)**

**5. Derive the expression for inductance of a 3 phase line with symmetrical & unsymmetrical spacing.**

**6. Discuss the concept of GMR and GMD in the calculation of transmission line inductance.**

**7. Derive the expression for inductance of a 3 phase double circuit line for hexagonal spacing and**

**flat vertical spacing with transposition.**

**8. (i) Explain the various factors affecting corona loss and methods of minimizing them. (8)**

**(ii) Derive the expression for the voltage induced in cornmunicatioi lines due to current in power**

**lines. (8)**

**9. Deduce an expression for the sending end and receiving end power of a line in terms of voltage**

**and ABCD constants. Show that the real power transferi’ed is dependent on the power angle and**

**reactive power transferred is dependent on the voltage drop in the line.**

**10. Write short notes on i) Shunt compensation ii) Series compensation**

**11. Draw the phasor diagram and explain the procedure for determining the voltage regulation,**

**transmission efficiency and ABCD constants of medium transmission line using nominal T and pi**

**method.**

**12. Explain the procedure for determining the voltage regulation, transmission efficiency and ABCD**

**constants of long transmission line using nominal T and pi model.**

**13. Explain two methods of grading of cables with necessary diagrams.**

**14. (i) What are different methods to improve string efficiency of an insulator? (8)**

**(ii) Draw the schematic diagram and explain various types of insulators. (8)**

**15. (i) Briefly explain about various types of cables used in underground system. (10)**

**(ii) Describe with the neat sketch, the construction of a 3 core belted type cable. (6)**

**16. Explain various methods of neutral grounding.**

**17. Draw the circuit arrangement and explain the various elements of substation schemes.**

**18. (i) Explain the design principles of substation grounding system. (8)**

**(ii) Discuss and compare radial and ring main distribution system. What is the role of**

**¡nterconnectors in distribution system. (8)**

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