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This paper presents implementation of algorithms developed for fault classification and location detection on transmission lines with data from current & voltage sensors. Rogowski coil as current sensor is gaining importance due to its linearity and wide band width. A lumped parameter model of Rogowski coil is developed and integrated with a power system model in SIMULINK to simulate all types of faults at different locations, fault inception angles and fault resistances. A fault classification scheme based on the evaluation of angles of fault currents and voltages is extended to secondary values obtained from Rogowski coil. Further after estimation of phasors, fault location is detected. The test results show that the proposed algorithm on primary values is equally applicable on secondary values thus offering a fast and reliable technique for fault diagnosis of transmission lines in power systems.

Fault Diagnosis of Transmission Lines with Rogowski Coils as Current Sensors