Abstract
This paper presents a computational analysis of the difference between the values of the self parameters (resistance, inductance and potential coefficient) of some typical transmission lines. The earth return effect is included. A new coefficient of unsymmetry for the untransposed transmission line parameters is proposed. The wave mode parameters as a function of the given coefficient of unsymmetry are deduced.The balancing of the parameters of both transposed and untransposed lines is applied. The percentage error in the calculated voltage at any point of the untransposed line, if considered as transposed, is formulated.
Highlights
The study of electromagnetic transients is essential for the adequate design and operation of power systems
As this percentage error is a function of time, its value greatly decreases for steady state operations while it is maximum for transient duration (Fig. 7)
The maximum deviation in the values of the transmission line parameters in phase coordinates does not exceed 5.5% and the line may be suggested as horizontal type so that only one coefficient of unsymmetry can be proposed for long distance transmission line
Summary
ISMAIL Electrical Power Dept., Faculty ofEngineering, Suez Canal University, Port Said, Egypt (Received July 30, 1986). This paper presents a computational analysis of the difference between the values of the self parameters (resistance, inductance and potential coefficient) of some typical transmission lines. A new coefficient of unsymmetry for the untransposed transmission line parameters is proposed. The wave mode parameters as a function of the given coefficient of unsymmetry are deduced. The balancing of the parameters of both transposed and untransposed lines is applied. The percentage error in the calculated voltage at any point of the untransposed line, if considered as transposed, is formulated
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