Abstract
Traditional methods for performance assessment of transmission line protective relays by hardware inspection and testing seem to be inadequate in case of contemporary digital relays. This is because about 80% of the engineering design content of digital relays is in the software area. Therefore, software reliability naturally emerges as an area of utmost interest. Recently, some digital relay algorithms have been proposed based on frequency domain using wavelet-neuro-fuzzy approaches for transmission line protection. In this paper, a software reliability allocation model is developed for the performance evaluation of such a digital relay for detection, classification and location of transmission line faults. Keeping the relative importance of different functions of a multi-functional digital relay, the software reliability allocation has been implemented using the analytical hierarchy process. The results contained in this paper validate the efficacy of the proposed method for optimising the utility of frequency domain-based digital relay for real-time implementation.
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