A new computer-based flux-restrained differential relay for three-phase three-limb power transformers are described in this paper. According to the new scheme, an algorithm for identifying the inrush current is presented. It is shown that this protection technique requires fewer computations as compared to the traditional method, and hence can be implemented on a microcomputer of modest capability. A variety of operating conditions simulated on a computer were used to test the algorithm. The results of the...
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