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Ultra High Speed Protection of Series Compensated Transmission Lines using Wavelet Transforms

In this paper, a novel UHS distance protection scheme for EHV transmission line protection using wavelet transforms is presented. In particular, the deficiencies associated with the already proposed UHS distance protection schemes has been investigated and a novel solution is presented. The fault distance is estimated from the travelling waves directly instead of the 'synthesized' relaying signals as suggested in the previously proposed UHS distance protection schemes. As a result, cross-correlation function is not used to determine the fault distance. Moreover, the relaying signals are processed using the wavelet transform instead of conventional filtering