In-Depth Study on Deflection Control Measures of Long-Span Suspended Tubular Busbar

Abstract

In recent years, with the wide application of long-span suspended tubular busbar in substations of various voltage levels, the problem of excessive deflection of tubular busbar has become more and more prominent. In this paper, relying on a 750 kV substation, aiming at the problem of excessive deflection of the long-span suspended tubular busbar, a three-dimensional finite element model is established to calculate the deflection and field strength of the tubular busbar, and a new type of tubular busbar suspension system is proposed by means of comprehensive comparative analysis, theoretical calculation and true-type testing, namely, V-shaped insulator string with double-sided auxiliary cable tubular busbar suspension system. And related fitting is developed and manufactured. Compared with the current solution, the tubular busbar deflection in the interval and between the suspension points of adjacent intervals can be greatly reduced to less than 0.5 D (D is the outer diameter of the tubular busbar), and it has the advantages of controllable field strength, simple structure, and convenient construction. Taking a 750 kV substation as an example, it can save about 28% of the investment in the tubular busbar fittings. The research results of the V-shaped insulator string plus double-sided auxiliary cable suspension system and its special fittings provide technical support for the subsequent construction of long-span suspended tubular busbar projects, and it has broad application space and excellent social benefits.