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The specific features of the detection of disconnection faults and double-phase short circuits in the wires of overhead transmission lines (OTLs), which have a tree topology with a voltage of 6–35 kV and a linear structure with a voltage of 110 kV and higher, have been studied. The techniques for interpreting reflectograms at failures in the wires of OTLs have been shown. Studies have been carried out under laboratory conditions using OTL models and under real conditions using operating OTLs.

The peculiarities of detection using the location method of single-line-to-ground faults in the electricity transmission lines (ETLs) with 6–35 kV of tree topology and linear structures of 110 kV and higher have been studied. Ways of recognizing reflectograms if there is a fault in the ETL are presented. The investigations were carried out in laboratory settings using ETL models and under real conditions on working ETLs.

Peculiarities of the location method to sound power transmission lines (PTL) of 6–35 kV in voltage with tree topologies and PTLs with voltages of 110 kV or higher with linear topologies are considered. Methods of recognizing a reflectogram are shown for cases of a short circuit, single-phase-to-ground short circuit, and wire breakage in PTLs. Possibilities of using the location method for PTL sounding are discussed.

A remote pulse method for determining glaze ice on the wires of power transmission lines is discussed. The accuracy of the proposed method is higher than that of the known methods owing to the added circuit for measuring the temperature of the segment of the wire of a power transmission line. Two versions of a device that implements the considered concept are proposed.