大跨度悬吊式管母挠度控制措施的深化研究

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

摘要: 近年来，随着大跨度悬吊式管母在各电压等级变电站中的广泛应用，管母挠度过大所带来的问题愈发突出。依托某750 kV变电站，针对大跨度悬吊式管母挠度过大问题，建立三维有限元模型计算管母挠度、场强，采用综合对比分析、理论计算结合真型试验的方法，提出了一种新型管母悬吊系统，即V型绝缘子串加双侧辅助拉索的管母悬吊系统，并研发了相关金具。结果表明，V型绝缘子串加双侧辅助拉索的管母悬吊系统较现行方案，可大幅降低间隔内及相邻间隔悬吊点之间的管母挠度，使其小于0.5 D (D为管母外径)，同时具有场强可控、结构简单、便于施工等优势。以该750 kV变电站为例，可节约750 kV管母金具投资28%左右。V型绝缘子串加双侧辅助拉索的管母悬吊系统及其特制金具的研究成果，为后续具有大跨度悬吊式管母工程提供技术支持，具有广阔的应用空间和良好的社会效益。

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.