Electrical Engineering XYZ MCQ
For complete protection of 3-phase system from short circuit faults minimum number of relays required are:
Correct answer: 2. Three
Explanation: For complete protection of 3-phase system from the short circuit faults minimum number of relays required are three. In which two are the over current relays which are connected in any of the two phases and one earth fault relay, which is connected between ground and neutral.
In a 3-phase power system, the protection against short circuit faults typically involves overcurrent relays and earth fault relays. Although three can be considered correct answer for most cases. However, the specific number of relays required depends on the type of protection scheme employed and the desired level of protection.