The Design And Research On The Parameters Calculation And Software Of The Multi-tower High Voltage Transmission Line

High-voltage transmission line is an important component of the power system.With the development of power system,the high-voltage transmission lines tend to be widely used in variety forms, including multi-tower form. And its electrical power system parameters are also important part of the system. The accuracy of the parameters have great significance for the operation of power grids, scheduling, planning departments of power system. However,the parameters of the multi-tower transmission line are effected by the form of high-voltage transmission line,by the conductor's own parameters,the environmental conditions,the parameters of the Earth,and so on.If we use the hand way which is used by the power system design, planning, operation departments for long-term to calculate the parameters directly,it is hard to meet the need of design of high voltage transmission line in the modern power system on the calculation accuracy and efficiency.Combined with domestic and foreign large amount of relevant information, accordance with domestic and foreign transmission line parameters of the experience of calculation, based on Carson mathematical model for high-voltage transmission line,the paper presents the Theory of calculation and the calculation of derived; and presents the way to calculate the parameters used in Carson Formulas and the Earth-return Formulas in detail; on this basis of the theory of calculation, the paper presents the way to calculate the sequence components, and also presents the six-sequence component parameters for double-circuit transmission line In particular; Finally, according to national standards, the paper presents the calculation of the parameters such as unbalance factor,which is used to provide the reference of transposition for engineers.This high-voltage multi-tower transmission line parameter calculation software is base on Matlab's graphical user interface (GUI). According to the calculation of the transmission line parameters in the papers, we design the software in the purposes of accurate and reliable calculation.