Insulation Coordination Question Bank with Answers:

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1. Why is insulation co-ordination required in a large power system ? What is meant by BIL of an equipment ?

2. What are the causes of dangerously high voltages on the transmission system? Give their relative magnitudes.

3. What are the means adopted to protect the power system against such overvoltages ? How is the insulation co­ordination carried out ?

4. What is the basic impulse level? Give its values for 33, 132, 220 and 400 kV effectively grounded systems.

5. What are BILs ? Explain their significance in power system studies.

6. State the difference between the “nominal system voltage” and “highest system voltage”. Gives examples.

7. Explain the protective characteristics of a lightning arrester against the withstand characteristic of equipment on a voltage-time curve.

8. Define the terms :

• Insulation co-ordination.
• Rated voltage of surge arrester.
• Basic insulation level.
• Transient surges.

9. Discuss the insulation coordination and basic insulation levels adopted for EHV lines and equipment.

10. Write short notes on the following :

• Co-ordination of system insulation.
• Selection of arrester rating.
• Insulation co-ordination between lines and substations.
• Choice of insulation levels for substation equipment.