Abstract
By means of a previously used and developed model, which contains non-linear shunt conductance in parallel with non-linear shunt capacitance, the effects of corona on travailing waves along h. v. transmission line are presented. A mathematical formula is used to evaluate its parameters. Simulink method of mat lab software is used to simulate the problem and solve the line differential equations including corona which is a part of it. A summary of pervious literature with different models is discussed. The result of the resented model compared with previous one.
Highlights
Overvoltage protection and insulation coordination are based to the knowledge of the magnitudes and waveforms of overvoltage
Two kinds of significant phenomena affect the attenuation and distortion of overvoltage which is propagating along overhead transmission lines: 1) variation of transversal parameters due to corona. 2) frequency dependence of longitudinal parameters caused by skin effect of conductors. 3) frequency dependent of ground parameters
-The effect of corona reduces and retards the crest value of the surge as it travels along the line
Summary
Overvoltage protection and insulation coordination are based to the knowledge of the magnitudes and waveforms of overvoltage. The corona attenuation and distortion of overvoltage wave is an important factor in determination of the overvoltage level in the electrical system due atmospheric lightning discharge. Two kinds of significant phenomena affect the attenuation and distortion of overvoltage which is propagating along overhead transmission lines: 1) variation of transversal parameters due to corona. 2) frequency dependence of longitudinal parameters caused by skin effect of conductors. Simulation of overvoltage wave propagation in electrical network by digital procedure is often used for solving the problem of the effect of corona on the wave propagation process. The aims of this paper are: To discuss of some methods of corona modeling which already have been presented by some authors concerning either linear or non-linear approach to the problem. A mathematical formula was used to evaluate the value of these parameters
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