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This paper refers to the distance protection of overhead transmission line. The phenomenon of `dead zones' in distance relay operation is established. This phenomenon consists of a segment of an overhead line, inside the distance relay reach, where the relay can not detect a fault. The nature of the dead zone phenomenon is the most complex when the distance protection of mutually coupled lines is considered. Thus, clarifying the nature and proposing measures for elimination of dead zones from distance protection are main objectives of this paper. A simple example is considered to get a qualitative insight into the dead zone appearance. Presented considerations are illustrated by example belonging to the actual power system of Yugoslavia.