- Detect quickly the existence of abnormal conditions such as fault or overload - Operate accurately and selectively to isolate the faulty circuit - Provide a quick diagnostic on which part of the system fails. By means of flag which indicates the relay has operated, the nature and location of the fault in the system can be identified. (Applications of Over Current Relay) - Zone - Discrimination - Main Protection - Back-up Protection - Unit Protection - Non-unit Protection - Sensitivity
- Detect quickly the existence of abnormal conditions such as fault or overload
- Operate accurately and selectively to isolate the faulty circuit
- Provide a quick diagnostic on which part of the system fails. By means of flag which indicates the relay has operated, the nature and location of the fault in the system can be identified.
(Applications of Over Current Relay)
- Zone
- Discrimination
- Main Protection
- Back-up Protection
- Unit Protection
- Non-unit Protection
- Sensitivity
this good vidio
How old is this video ?
I think the answer is about a century !