Layout structure and design method of wall-piercing bushing for UHV DC project pole line

Abstract

The invention relates to an arrangement structure of a polar line wall bushing of an extra-high-voltage direct-current engineering and a design method thereof. The arrangement structure comprises an upper vertical wall, an inclined wall, a lower vertical wall, and a polar line wall bushing passing through the inclined wall vertically, wherein the walls are successively connected to form a side wall of a valve hall. Grading shields are respectively arranged at the two ends of the polar line wall bushing. A shortest distance between the grading shield, located outside the valve hall, of the polar line wall bushing and the upper vertical wall and the length of the part, located outside the valve hall, of the polar line wall bushing are equal to an air clearance between the grading shield located outside the valve hall and the side wall of the valve hall; and a shortest distance between the grading shield, located inside the valve hall, of the polar line wall bushing and the lower vertical wall and the length of the part, located inside the valve hall, of the polar line wall bushing are equal to an air clearance between the grading shield located inside the valve hall and the side wall of the valve hall. The structure and the method can be widely applied to arrangement of a polar line wall bushing in the extra-high-voltage direct-current engineering; and on the premise that the air clearance requirement is met, the length of the polar line wall bushing is shortest and the bending moment is minimized.

Description

technical field [0001] The invention relates to an arrangement structure and a design method of a wall-piercing bushing for a pole line of a UHV DC project, in particular to an arrangement structure and a design method for a wall-piercing bushing of a ±1100kV UHV DC project pole line. Background technique [0002] As the link connecting the valve hall and the DC field in the DC project, the pole line wall bushing is usually arranged on the side wall of the valve hall. like figure 1 As shown, the traditional wall-piercing bushing layout structure considers two factors: one is to meet the air clearance requirements of the end of the polar line wall-piercing bushing to the side wall of the valve hall; the other is to prevent the polar line wall-piercing The pipe located outside the valve hall caused wet flash due to uneven rain. In the case of comprehensive consideration of the above two requirements, the polar line wall bushing is usually designed to be inclined upward by 10...

AI Technical Summary

Problems solved by technology

On the one hand, the increase in the external insulation requirements of the pole line leads to an increase in the air clearance between the wall bushing of the pole line and the side wall of the valve hall, which in turn increases the length of the wall bushing of the pole line; on the other hand, the internal insulation requirements of the pole line The improvement of the polar line wall bushing increases the thickness of the insulating material, which in turn leads to an increase in the weight of the polar line wall bushing, and the bending moment of the bushing increases accordingly

However, it is difficult to solve the design and manufacturing problems caused by the large length and bending moment of the wall-piercing bushing for the ±1100kV UHV DC project using the traditional wall-piercing bushing layout structure.

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