Simple over current protection using fault analysis on line

- 11kV system having load at 0.9 pf connected using a Transmission Line of 40 km long - overcurrent relay is modeled using SR flip flop

- SR flip flop is used for overcurrent relay modeling
- Over-current relay is provided for 40km long line protection
- the fault is applied at 0.1s which detect by the relay which open the circuit breaker
- CT is a model using a gain block (1000/1)
-The first part is used to find setting using fault analysis which finds positive, negative, and zero sequence currents
-the second file used to provide protection of the short transmission line