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A mathematical technique for detecting fault section(s) and affected area(s) on radial distribution networks is proposed in this paper. Minimum voltage sensors are installed at various locations at the customer ends. The novel method uses messages obtained from operated voltage sensors and topological information of distribution networks to detect accurately fault section(s) and fault affected area(s) due to single as well as multiple faults. A mathematics algorithm using C++ is developed which suggests that the technique is efficient and effective.