Overhead Line Insulators Question Bank with Answers:

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1. What electrical and mechanical characteristics are required for a good insulator for use in hv transmission lines ?

2. Name the various materials that are commonly used for overhead line insulators. Why glass insulators cannot be used above 50 kV ?

3. Name the different types of insulators used in power systems along with the uses of each insulator and explain pin type insulator in detail.

4. Explain different types of insulators used in power system.

5. Explain, with neat sketches, the constructional features of pin type and suspension type insulators. List the advantages of the latter type over the former for high voltage transmission lines.

6. Explain the suspension type insulators with neat diagram.

7. Describe the following briefly: (a) Pin type insulator. (b) Suspension type insulator. (c) Post type insulator.

8. Explain strain and shackle insulators with the help of neat sketches.

9. Mention appropriate locations where you would use (i) pin type (ii) suspension type (iii) strain (iv) shackle and (v) egg type insulators.

10. Describe about the following in brief

• String insulators.
• Pin insulators.
• Strain insulators.
• Shackle insulators.

11. Name the various causes for the failure of overhead line insulators.

12. Describe the reasons for the failure of an insulator. What do you mean by the string efficiency of an insulator of n units ?

13. List the basic tests that are carried out on insulators.

14. Explain the reasons for unequal potential distribution over a string of suspension insulators.

15. What is string efficiency ? Why is it necessary to have a high string efficiency ? How can it be achieved ?

16. Define ‘string efficiency’. Explain different methods of improving string efficiency.

17. Write short notes on the following :

• Insulator materials.
• Overhead line insulators.
• String efficiency.
• Use of guard rings and arcing horns.