Analysis of Voltage Sag in Sub Transmission System

The disturbances created in A C Transmission line power flow due to various faults and unavoidable natural circumstances has to be monitored carefully for uninterrupted power supply to the consumer and to avoid hazardous situations. The subtransmission system with standard 33kv, 66kv, 132kv and 220kv transmission lines which are usually out of sight are considered for analysis purpose. The various faults which occur in transmission lines leading to voltage sag are simulated, modelled and analyzed using MATLAB/SIMULINK tool