Important Questions of Power System Protection:

1. Explain briefly the role of protection in a power system.
2. Describe the essential features of a protective relay with reference to reliability, selectivity, speed of operation and discrimination.
3. What are the principal types of faults in a power system? In what way is a fault harmful to the power system?
4. Define the terms: burden, pickup, reset, operating time.
5. Explain what is meant by primary protection and backup protection.