Scientific journal
Scientific Review. Technical science
ISSN 2500-0799
ПИ №ФС77-57440

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CALCULATION OF UNSTEADY TEMPERATURE REGIMES OF OVERHEAD POWER LINES, TAKING INTO ACCOUNT THE NONLINEARITY OF HEAT TRANSFER PROCESSES

Girshin S.S. 1 Goryunov V.N. 1 Bigun A.Y. 1
1 Omsk State Technical University
A new approach to the calculation of time-dependent temperature regimes of overhead power lines, based on an approximate analytical solution of the differential equation of heat. This equation is nonlinear, as it contains the fourth power of the absolute temperature of the wire. The proposed approach is performed lowering the temperature to a second degree least squares in analytical form. Transformed equation is fairly simple general solution, defined by four parameters. Comparative calculations show that the temperature of the wire at any time by the inventive method and by numerical solutions of the original equation, practically do not differ from each other. The developed method can be used for validation of the thermal regime of the line in a changing load, as well as for the calculation of the energy loss.