Abstract:
Work on station need continuity of supply, any fault occur in substation will eliminate the services from the units for this reason effective protection action is required to minimize damage and repair costs where it senses fault, Ensure safety of personnel.
The relays have been used to protect the transformer. There are many type of relay according to their generation and tasks, the digital relays are the most developed.
The digital relay used in this project to product power transformer because there is many features. One of these feature it is multiple functions. Some of testing has been done for some protection by using simulation program it private of company (ABB) to define the digital relay efficiency (speed response, reliability and concordance….etc).
