Abstract
Computer models of a congeneric loss and lossless line were developed on Delphi. These computer models are used to study the steady-state operating conditions of a congeneric line and allow to determine voltages, currents, power and resistance at any point and for different values of the primary parameters of the line, to build graphs of voltages and currents. Due to the fast speed of the program and the convenience of calculations, computer models can be used as virtual laboratory works for educational purposes in universities, colleges, or any scientific and technical institutions.