Optimisation, technical losses, transmission network system, transmitted power.

This paper deals with the methodology of software to promote optimised operation of the transmission network. The methodology is based on the real data referring to operating temperatures and the power transmitted over 220 kV and 400 kV lines. This is an input database, formed by the values of power transmitted at a real time temperature. The software designed here offers a choice of the line to be observed with the option to set the temperature range. The outcome produced will comprise a graphic depiction of operation of the selected transmitter network line with respect to the power transmitted. The graphic depiction of operating course helps show the technical losses associated with the value referring to power transmitted. The methodology of this function has been simulated using an MS Excel sheet.