Abstract
Though transmission lines are designed to ensure a reliable supply of energy with the highest possible continuity, but about 85-87% of faults in power system occur in transmission lines. Faults can occur due to external causes or internal failures. Identification of type and location of fault is extremely necessary to reduce the outage time and maintenance works. Switching phenomenon occurring in transmission lines often produces similar types of transients as that of faults, making the identification task even more difficult. The present paper discusses about the simulation of symmetrical, unsymmetrical faults, arc faults and a special case of switching transient on a frequency dependent line model. Fault identification has been performed with the help of Short Time Fourier Transform (STFT). STFT has been used to characterize the transient waveforms occurring due to disturbances in time and frequency domain. The study reveals that the amplitude and frequency of the first predominant peak present in the STFT coefficients after the disturbance occurs can help to identify the type of disturbance.
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