The goal of the present paper is looking for ways of effective use of PMUs in local relay protection and automation systems of power transmission lines. The general use of microprocessor devices allows extendin functions of protection and automations, for creation complex and more comfortable in devices exploitation. Basic view and possibilities of the use of PMU are described, such as: distance protection, fault location and autoreclosing. A faulted transmission line connecting two power systems are presented in the paper. The algorithm under consideration practically excludes the influence of the load currents, the power transmission line operation modes and the transient resistance at the place of short-circuits. The support of the data transfer between two terminals provides means for implementation of the discussed algorithm that employs several techniques of current distribution coefficients determination. This paper illustrates algorithms of realization of the described automation functions, on condition that communication channels are shared with the differential protection operation. To minimize potential damage that commonly depends on fault point and type as well as on prefault conditions, one should solve a complicated, in general case, task of breaker reclosing sequence choice. The described algorithm provides wide possibilities for setting optimal breakers' autoreclosing number and sequence.