A Design Method for Guyed Tower Used in UHV ±800kv Engineering

Abstract

The invention discloses a design method of a guyed tower for ultrahigh voltage + / -800kV engineering. The method comprises the steps of drawing a clearance circle according to the design condition, producing the clearance circles for various design conditions and envelop curves of the clearance circles, and calculating the space between horizontal lines, space between vertical lines and distance to ground of guide lines; setting the space between two vertical columns and the positions of insulator string suspension points according to the size of the envelope curves of the clearance circles, the space between the horizontal lines and the space between the vertical lines of the guide lines, and creating a preliminary scheme of an iron tower; calculating the design conditions including heavy wind, ice covering, line breaking and installation, loads including operation overvoltage, thunder and lightning overvoltage and working conditions including electric work and the load combination through a nonlinear calculation module; adjusting the preliminary arrangement scheme of the iron tower according to the load and load combination; adjusting the specification of any rod without meeting the stressing condition; finally determining the space between the vertical columns, inclination angles of the main columns, the positions of the insulator suspension points, the positions of the guide line suspension points and the inclination of bracing wires as well as the specification of a component and joint design.

Description

technical field [0001] The invention relates to the field of high-voltage power transmission, in particular to a design method for a cable tower used in an ultra-high voltage ±800kV project. Background technique [0002] In the past, the transmission line towers used rigid cross-arms to suspend the wires and their insulators. The force transmission method was that the wire load was transmitted to the cross-arms of the wires through the insulators, and then transmitted from the cross-arms to the tower body. The crossarm is usually made of steel or other composite materials with a large elastic modulus. It is a steel frame or truss structure composed of multiple components. The deformation under the action of force is very small and can be ignored. figure 1 It is a common rigid cross arm in the form of truss. Wherein the label indicates: the tower body 10, the rigid wire cross arm 11. [0003] figure 2 It is the most commonly used self-supporting tower in ±800kV transmissi...

AI Technical Summary

Problems solved by technology

[0014] However, the existing rigid cross-arm transmission line tower is a statically indeterminate space truss structure, and the consumption of the tower and the foundation is relatively large; and the current tower design method is based on the premise that there is no large geometric deformation of the tower structure. method

If there are large geometric deformations in the tower structure, the existing method of tower design is no longer applicable

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