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Abstract In this paper, an improvement of digital differential relay reliability for protecting a large power transformer is discussed. First, the Fourier sine and. protection is focused on discriminating the internal faults from the magnetizing inrush. The proposed digital differential relay is designed using a simulation.
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And Digital Relays Interconnected by an IEC 61850-9-2 Digital Process Bus. A digital protection system typically consists of optical instrument. Numerical Protection Relays NPRs are black tie guide morning dress waist elements in any power distribution network.