Question
Download Solution PDFWhich type of relay is less affected by power surges?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe correct answer is option 1.
Classification of distance relay
1.) Reactance relay
- This relay is used for the protection of short transmission lines.
- The reactance relay is independent of the resistance value.
- A reactance relay is an overcurrent relay with directional restraint.
- The directional element is arranged to develop maximum negative torque when its current lags its voltage by 90°.
2.) Impedance relay
- This relay is used for the protection of medium transmission lines.
- An impedance relay is a voltage-restrained overcurrent relay.
- This relay operates when the impedance seen from the source to the faulty point is less than the relay setting.
3.) Mho relay
- This relay is used for the protection of long transmission lines.
- This relay is least affected by power surges.
- An impedance relay is a voltage-restrained directional relay.
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