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According to actual setting-up operation condition of the soft busbar in the ultra-high voltage substation, the nonlinear piecewise catenary equations are established including weight of the insulator string, elastic elongation of the busbar, weight load of the electrical fitting etc. several influence factors on basis of the elastic catenary equation. The initial value selection plan is also given out for Newton iteration method of the nonlinear equations. The method sets both the insulator string and the busbar as the catenary lines, and considers the weight of fitting of multiple split conductors in the final cable shape, which greatly improves calculation accuracy. Reliability of the method is validated through comparison between calculation result of the piecewise catenary method and actual data. The piecewise catenary calculation forwarded in this paper is simple in formation and small in calculation quantity, which is liable to realize by program. The sags corresponding to the different blanking length of the busbar are obtained according to calculation results. The method can provide the effective mean for the length calculation and engineering construction of the soft busbar in the ultra-high voltage substation.

Application of Piecewise Catenary Method in Length Calculation of Soft Busbar in Ultra-high Voltage Substation