NEGATIVE SEQUENCE RELAY

identify the type of relay used to detect negative sequence in a power system.

• A) Overcurrent relay

• B) Differential relay

• C) Negative sequence relay

• D) Distance relay

Which type of fault in a power system is detected by negative sequence relay?

• A) Phase to phase fault
• B) Three-phase fault
• C) Phase to ground fault
• D) Unbalanced fault

What is the main function of a negative sequence relay in a power system?

• A) To detect overcurrent in the system
• B) To detect fault location in the system
• C) To detect unbalanced conditions in the system
• D) To detect voltage sags in the system

Which of the following is an advantage of negative sequence relay?

• A) High sensitivity to low-level faults
• B) Fast response time
• C) Low cost
• D) Easy to set up and maintain

Which of the following is a disadvantage of negative sequence relay?

• A) High cost
• B) Slow response time
• C) Low sensitivity to low-level faults
• D) Complex to set up and maintain

What is the formula to calculate negative sequence voltage?

• A) Va - Vb
• B) (Va + Vb + Vc)/3
• C) (Va + aVb + a^2Vc)/3
• D) Vc - Va

Identify the type of connection used in negative sequence relay.

• A) Wye connection
• B) Delta connection
• C) Series connection
• D) Parallel connection

Which of the following factors affects the performance of negative sequence relay?

• A) Frequency
• B) Temperature
• C) System load
• D) All of the above

What is the function of a time delay in a negative sequence relay?

• A) To prevent nuisance tripping
• B) To increase sensitivity
• C) To decrease response time
• D) To prevent false tripping