+/-500kV common-tower double-circuit DC transmission line tangent tower upper insulator string transmission method

Abstract

The invention discloses a + / -500kV common-tower double-circuit DC transmission line tangent tower upper insulator string transmission method. For the situation where an upper cross arm of a + / -500kV common-tower double-circuit DC transmission line tangent tower is narrow, and a lower cross arm thereof is wide, the upper cross arm is provided with a sliding rail extending outward to enable an insulator string to be transferred to the outer side of the cross arm, so that when the insulator string is lifted vertically, the problem that the insulator string scratches and bumps the lower cross arm and the like can be effectively prevented, and meanwhile, the problem that tilt lift of the insulator string is influenced by landforms is also solved, the number of work personnel is reduced, work safety is improved, influence of landforms is overcome, and labor intensity of the work personnel is reduced. The method is wide in application range, and is also suitable for the transmission of an upper insulator string of a common-tower double-circuit AC transmission line.

Description

technical field [0001] The invention relates to the technical field of high-voltage power transmission, in particular to a method for transferring upper pole insulator strings up and down in the live replacement operation of the upper pole insulator strings of the straight tower of the ±500kV double-circuit line on the same tower. Background technique [0002] The ±500kV Niu Cong A-B DC Line is the world's first DC transmission line erected with double circuits on the same tower. The line starts from Yanjin Niuzhai Converter Station in Zhaotong, Yunnan, passes through Yunnan, Guizhou, Guangxi, and Guangdong, and ends at Conghua Congxi Converter in Guangdong The flow station has a total length of 2×1251 kilometers. The single-circuit capacity of direct current transmission is 3.2 million kilowatts, and the total double-circuit capacity is 6.4 million kilowatts, which is equivalent to half the electricity load of Guangzhou City. This line is the first in the world to erect a d...

AI Technical Summary

Problems solved by technology

There are two existing methods. One is to pass the insulator string vertically at the tower foot below the cross arm. This method requires a special operator on the lower cross arm to be responsible for the insulator string not to collide or rub against the tower body. This method is likely to cause personal injury, equipment damage, etc. The other is to lift the insulator string by tilting. This method requires a wide terrain at the foot of the tower. Due to the inclination of the insulator string, the lifting force is large. When the terrain is limited, When the control rope at the tail end fails to control the direction of the insulator string to the outside, it will make it difficult or impossible to lift the insulator string, and the working efficiency will be greatly reduced

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