An anti-corona flange for UHV post insulators
A pillar insulator, anti-corona technology, applied in the direction of supporting insulators, insulators, circuits, etc., can solve the problems of stress on the porcelain body, poor sealing of the flange, and deterioration of the colloidal layer, and achieves excellent oxidation effect. The effect of ensuring safe use and improving service life
Active Publication Date: 2017-12-05
STATE GRID CORP OF CHINA +1
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Problems solved by technology
[0004] Long-term corona discharge will cause the colloidal layer (cement) to loosen, deteriorate, and carbonize, and then the flange mouth will not be sealed tightly, and moisture will penetrate into the flange, resulting in ceramic bodies, adhesives, flanges and other materials with different expansion coefficients. As the ambient temperature changes, the ceramic body is stressed, which eventually leads to damage
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Embodiment 1
[0039] The casing 3 is vertically installed on the base 5, and the inner and outer walls of the end of the casing 3 are rounded 7 by 90°. Position welded ring-shaped anti-corona parts 6, anti-corona parts 6 are cast from aluminum alloy, the aluminum alloy is Si: 0.57%, Fe: 0.55%, Cu: 0.36%, Mn: 0.10%, Mg : 0.85%, Cr: 0.12%, Zn: 0.19%, Ti: 0.11%, and the balance is Al.
[0040] Sleeves 3 are installed at both ends of the porcelain column 1 of the pillar insulator, and a colloidal layer 2 made of cement marked P.O52.5 is added between the sleeve 3 and the porcelain column 1 .
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The invention provides an anticorona flange for an extra-high voltage post insulator. The flange is made of steel or aluminum alloy and comprises a base and a sleeve vertically arranged on the base. The sleeve is arranged at the end of a knob insulator of the post insulator, and a rubber layer is arranged between the sleeve and the knob insulator. The anticorona flange is characterized in that an anticorona piece is arranged along the circumference of the outer wall of the end of the sleeve. Compared with the prior art, the anticorona flange for the extra-high voltage post insulator has the advantages that corona produced by the insulator under the extra-high voltage is effectively eliminated, and the safe using of the insulator is guaranteed.
Description
technical field [0001] The invention relates to a flange used for post insulators, in particular to an anti-corona flange used for UHV post insulators. Background technique [0002] The post insulator is an insulating post that supports the bus bar of the high-voltage power distribution device and the live part of the high-voltage electrical appliance. The structure is as follows: figure 1 As shown, it is made of porcelain columns and upper and lower metal accessories (steel feet, iron caps, flanges, etc.) through concrete glue. A large number of post insulators for outdoor installations use a rod-shaped structure - a solid round ceramic post with an umbrella. The flashover distance of the ceramic post along the external air gap is almost equal to the internal through-through breakdown path, and only external flashover will occur without porcelain The internal breakdown of the dielectric is very important to the safe operation of the insulator. The existing post insulators...
Claims
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IPC IPC(8): H01B17/38H01B17/42H01B17/14
Inventor 赵波金雪芬杨京齐李静
Owner STATE GRID CORP OF CHINA