Extra-high voltage alternating current (AC)/direct current (DC) sleeve

Abstract

The invention provides an extra-high voltage alternating current (AC) / direct current (DC) sleeve which is simple in structure, shorter in length and convenient to transport and install and greatly reduces the manufacturing difficulty. In the extra-high voltage AC / DC sleeve, an upper end of an oil-safe plus (SF)6 sleeve stretches into the inner lower part of a composite hollow insulator; the lowerend of the composite hollow insulator is in sealed connection with a flange of the oil-SF6 sleeve; SF6 gas is filled in the composite hollow insulator; and the upper end of a conductive rod passes through the composite hollow insulator and the lower end of the conductive rod is connected with a top terminal on the top of the oil-SF6 sleeve.

Description

technical field [0001] The invention relates to an ultra-high voltage AC / DC bushing, in particular to an AC / DC bushing applied to a 252kV and above ultra-high voltage AC / DC transformer or reactor. Background technique [0002] For the structure of traditional high voltage bushing 5 see figure 1 , It is mainly composed of capacitor core 1, outer insulation (porcelain sleeve or composite hollow insulator) 2, installation (grounding) flange 3 and other components. The capacitor core is the main insulation of the bushing. It is a series coaxial cylindrical capacitor composed of multi-layer electrodes wrapped around the central conductive tube of the bushing, and insulating materials such as insulating paper used between the electrodes as the inter-electrode medium. One end of the capacitor is connected to the center The conductive pipes are connected, and the other end is led out from the measuring terminal connecting the flange. There are two types of outer insulation of the ...

AI Technical Summary

Problems solved by technology

[0004] 1. The processing and welding of the central conductive tube becomes very difficult, especially for 1100kV UHV bushings, the length of the central conductive tube reaches more than 15m, and the longest conductive tube in the industry generally does not exceed 8m

Conductive tubes are generally spliced ​​by welding, and the mechanical strength of longer conductive tubes is difficult to guarantee

[0005] 2. When the capacitor core is wound, the degree of winding increases with the increase of the length and diameter of the core, which increases the dispersion when the plate is wrapped, which directly affects the final electrical performance of the bushing

[0006] 3. After the winding is completed, vacuum drying must be carried out. Since the dehydration effect of the core is most affected by the axial length, the vacuum drying time will become very long and the effect is difficult to be effectively guaranteed, which will affect the key electrical properties of the product. ------ Dielectric loss factor has an adverse effect

[0008] 5. Due to the increase of the length, volume and weight of the casing, the difficulty of casing assembly and later transportation and installation is greatly increased

Therefore, for the ±800kV bushing, there will be a large number of fractures and damages, and slight vibration and swinging of the end wiring may cause damage to the bushing

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