Abstract: One or more sensors coating a conductor of a high-voltage overhead line provide the signals for measuring variables associated with the operation of a high-voltage overhead line such as voltage, current or phase, wire temperature, ambient ionization etc. These signals are converted by analog-to-digital conversion in data which are acquired to form messages about operating status of a high-voltage overhead line, which are sent out as digital telegrams wirelessly to a remote point. The entire acquisition process and data transmission are accomplished by the post positioned on a conductor of the high-voltage overhead line, operating on the potential of that conductor and receiving the operating energy from same line.