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This work describes the design of a DSP (Digital Signal Processor) based Adaptive Numerical Mho relay, to be used for distance protection schemes of long distance transmission lines. The relay settings will be automatically adjusted with the changes of power system parameters with the variation of frequency as well as with the variation of percentage compensation which may occur due to fault /damage in the compensating device itself for a series compensated line. The signal conditioning is oriented on the Inverse Discrete Fourier Transform (IDFT) and the relaying algorithm is based on Memory Mapped Targeting Technique (MMTT).
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