An 22 kV, 200 MVA alternator is grounded through a resistor of 5 Ω. The CT's have a ratio 2000/ 10. The relay is set to operate when there an out of balance current of 2 A. What percentage of the generator winding will be protected by the percentage differential scheme of protection?
Synchronous Generator
In comparison to an asynchronous generator, it is a machine where the rotor speed is equal to the rotating magnetic field produced by the stator, i.e., mechanical speed is equal to the electrical speed, thus called synchronous, and not asynchronous.
Salient Pole Rotor
Salient pole rotor includes a large number of exposed poles mounted on a magnetic wheel. The construction of a bright pole is as shown in the image on the left. The proposed poles are made of metal laminations. The rotor winding is provided on these poles and is supported by pole shoes.
Try to solve this in 30 minutes. .( An 22 kV, 200 MVA alternator is grounded through a resistor of 5 Ω. The CT's have a ratio 2000/ 10. The relay is set to operate when there an out of balance current of 2 A. What percentage of the generator winding will be protected by the percentage differential scheme of protection?.. )
Step by step
Solved in 2 steps with 2 images
