Insulation Coordination Interview Questions:
Following are the below Insulation Coordination Interview Questions and Important Questions which is very useful for interviews and exams
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 coÂordination 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.