UNIT I
Fundamentals of Protective Relaying
Q1) Define protective relay. Explain need of protective system.
Q2) What is Relay?
Q3) Explain nature, causes and types of faults and its effect on power system.
Q4) Give the types of electromagnetic relays.
Q5) What are the essential qualities of a Protective relay?
Q6) How the relays are basically classified?
Q7) What is meant by directional relay?
Q8) What is differential relay and list the applications of differential relay
Q9) What are the different types of electromagnetic relays? Discuss their field of applications
Q10) What are the various types of over current relays? Discuss their area of application.
Q11) Describe the operating principle, constructional features and area of applications of reverse power or directional relay.
Q12) Describe the construction and principle of operation of an induction type directional over current relay.
Q13) Explain the working principle of distance relays.
Q14) What Are the Main reasons For Main Protection Failure?
Q15) Write a note on backup protection.
Q16) What are the functions of protective relays?
Q17) Classify the protective relays.
Q18) Define plug setting multiplier & Time setting Multiplier.
Q19) Define protected zone. What is primary protection? What is back up protection?
Q20) Define relay time, Circuit Breaker Time and relay operating time.
Q21) What is biased differential protection?
Q22) Explain the principle of current differential relay with diagram.
