Gas-insulated metal-enclosed power transmission line and axial expansion joint thereof

Abstract

The invention provides a gas-insulated metal-enclosed power transmission line and an axial expansion joint thereof. The axial expansion joint comprises a first corrugated pipe, a second corrugated pipe and a third corrugated pipe which are coaxially and sequentially connected to form a short cylindrical structure, and flange structures are arranged at the two opposite ends of the short cylindricalstructure and used for being connected with two pipe section outer cylinders of the gas-insulated metal-enclosed power transmission line respectively. The axial expansion joint further comprises a pull rod component composed of a first pull rod and a second pull rod, the first pull rod penetrates the flange structure between the first corrugated pipe and the second corrugated pipe in a sliding mode, and the two ends of the first pull rod are fixedly connected to the flange structure of the first corrugated pipe and the flange structure between the second corrugated pipe and the third corrugated pipe respectively; the second pull rod penetrates the flange structure between the second corrugated pipe and the third corrugated pipe in a sliding mode, and the two ends of the second pull rod are fixedly connected to the flange structure between the first corrugated pipe and the second corrugated pipe and the flange structure of the third corrugated pipe respectively. The axial expansion joint has a large axial compensation amount, and good stability during expansion and contraction is guaranteed.

Description

technical field [0001] The invention relates to a gas-insulated metal-enclosed power transmission line and its axial expansion joint. Background technique [0002] Gas-insulated metal-enclosed transmission line (GIL for short) adopts gas-insulated metal-enclosed transmission technology, which is widely used because of its advantages of large transmission capacity, small footprint, and high reliability. The transmission line is connected in series by a large number of pipe sections. The pipe section includes an outer cylinder. A busbar for transmitting current is arranged inside the outer cylinder. The outer cylinder is also filled with a certain pressure of insulating gas to realize the insulation between the busbar and the outer cylinder. [0003] The thermal expansion and contraction of GIL caused by the temperature change caused by the alternation of seasons or the temperature difference between day and night, as well as the errors in the manufacturing and assembly proces...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an axial expansion joint to solve the problem of limited compensation of the expansion joint in the prior art; the present invention also provides a gas-insulated metal-enclosed transmission line to solve the problem of the gas-insulated metal-enclosed transmission line The problem of limited expansion and contraction when using the expansion joint in the prior art

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