Wind deflection prevention jumper cross arm of 1000kV tension tower

Abstract

The invention relates to a jumper cross arm of an ultra-high voltage tension tower of a power transmission line, in particular to a wind deflection prevention jumper cross arm of a 1000kV tension tower. The wind deflection prevention jumper cross arm is particularly suitable for a power transmission line tower in a strong wind area on the ultra-high voltage power transmission line. An original hanging angle steel is arranged into double angle steels AC and DF, two vertical cross web members BL, BJ, EO and EM are respectively arranged at the middle point to form inner and outer two reinforced trusses DFOM and ACLJ; the middle points of an upper chord member and a lower chord member are each provided with a horizontal supporting rod, upper and lower supporting rods are provided with two vertical cross web members NH and QE to form a QNEH cross truss, and the inner and outer trusses, a connecting rod member and the cross truss form a space truss which is used for resisting wind bias load.The additional torque is shared through the in-plane performance of the inner and outer trusses supported by the space truss, so that the bearing capacity damage and the instability of the hanging angle steel caused by wind deflection torque are effectively avoided, and therefore a technical realization foundation is provided for the application of the wind deflection prevention device in the ultra-high voltage 1000kV tension tower.

Description

technical field [0001] The invention relates to a jumper crossarm for a tension tower of an extra-high voltage transmission line, in particular to a jumper crossarm for a 1000kV tension tower against wind deflection, which is especially suitable for a transmission line tower in a strong wind area on an extra-high voltage transmission line. Background technique [0002] In transmission lines, many transmission poles and towers are installed in areas with strong winds and strong winds. At this time, in order to avoid the insulator jumper string being affected by the wind and causing deviation, and further causing flashover trips and other problems, windproof yaw hanging is widely used in 220kV transmission lines. A point device is used to solve this problem, so as to effectively reduce the windage range of jumpers or wires, and avoid flashover tripping; The way of weight makes the jumper string of insulators stable enough under the set wind level without wind deflection exceed...

AI Technical Summary

Problems solved by technology

[0003] However, in the 1000kV UHV line project, the weight and length of the insulator strings under the hanging angle steel are much larger than those in the 220kV line project, and in order to avoid wind deflection, the hanging point device at the wind deflection hanging point is connected with the The connection of the hanging wire angle steel is almost fixed. When the wind is strong, the windproof hanging point device and the insulator string will generate a very large torque on the hanging wire angle steel, which will easily cause the bearing capacity of the angle steel to be damaged or unstable, resulting in safety production accidents

In this field, it has been considered to solve the above problem by increasing the section size of the hanging angle steel. However, because the force of the insulator string with windproof hanging point on the hanging line angle steel is too concentrated, simply increasing the section size cannot effectively solve this problem. ; As a result, the windproof eccentric hanging point device cannot be used in the UHV 1000kV tension tower, and the problem can only be solved by avoiding strong wind areas

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