Tough column-type porcelain insulator for high-voltage line

Abstract

The invention discloses a tough column-type porcelain insulator for a high-voltage line. The insulator comprises an insulator body, an upper steel cap and a lower steel cap. The insulator body is provided with a bone column body, and an upper core head and a lower core head which are integrally connected with the two ends of the bone column body. Large umbrella skirts and small umbrella skirts arearranged on the bone column body at intervals. An annular groove and a plug-in slot are formed in the upper core head. Annular bosses are arranged on the surface of the inner side of the upper steelcap at intervals. A plug connector is arranged between the upper steel cap and the upper core head. Annular clamping slots are formed in the lower core head at intervals in the axial direction of thelower core head. Annular trenches are formed in the surface of the inner side of the lower steel cap at intervals. A clamping piece is arranged between the lower steel cap and the lower core head. Thetough column-type porcelain insulator has the advantages of high mechanical strength, excellent electrical performance, good quality stability and reliability, high mechanical impact resistance, highpollution resistance, small maintenance workload and low cost, and can completely meet the technical requirements on a column-type porcelain insulator for a 110-330KV high-voltage power transmissionline.

Description

technical field [0001] The invention relates to porcelain insulators, in particular to a strong pillar type porcelain insulator for high-voltage lines. Background technique [0002] With the impact of the environment including ice, frost, harsh weather and earthquake destructive force, high-voltage transmission lines have higher and higher requirements for the electrical and mechanical properties of post porcelain insulators. In 110KV-330KV transmission lines, the mechanical strength of post porcelain insulators The grade requirement is above 15KN, the tensile strength requirement is 180-200MPa, and the impact toughness requirement is also high. However, the body of the existing ordinary post-type porcelain insulators is mostly made of silicon-aluminum porcelain, and most of them are fired at high temperature with bauxite, kaolin and feldspar as the main raw materials. Although there are more corundum and Mullite, but the distribution of microcrystals in the phase group is ...

AI Technical Summary

Problems solved by technology

However, the body of the existing ordinary post-type porcelain insulators is mostly made of silicon-aluminum porcelain, and most of them are fired at high temperature with bauxite, kaolin and feldspar as the main raw materials. Although there are more corundum and Mullite, but the distribution of microcrystals in the phase group is not uniform, the grains are coarse, the sizes are different, and the content of pores and glass phases is also large, resulting in the strength level of the porcelain body of the existing ordinary pillar porcelain insulators below 15KV, and the tensile strength The strength is generally only 80-120 MPa, the best is only 150 MPa, and the impact toughness requirements are not high. Therefore, the mechanical strength of the ordinary porcelain insulator body is low and the quality is heavy, which cannot fully meet the technical requirements for 110KV-330KV high-voltage lines.

There are also special ceramics (such as silicon carbide ceramics, boron nitride ceramics, zirconia ceramics, etc.) to make 110KV-330KV pillar porcelain insulators, but the use of special ceramics requires a large amount of raw materials, high energy consumption and high manufacturing costs. The manufacturing process is complicated, and special ceramics are suitable for small tools, knives, blades, wear-resistant parts and engine components, etc.), which are not suitable for the production of heavy mass and large batches of porcelain insulators, and special ceramics are used to manufacture porcelain insulators. Solve the strength problem of the insulator body, but the connection strength between the insulator body and the steel cap still cannot be solved

The tensile strength of the existing rod-shaped pillar porcelain insulator products is low. Another reason is that the body of the porcelain insulator and the steel cap are generally connected and fixed by cement glue, and the bending moment resistance of the connecting body is poor. In addition, The 110KV-330KV high-voltage line is subjected to external factors such as its own gravity, wire tension, wind force and vibration, especially the increase in the force of the earthquake, and the connection between the porcelain insulator body and the steel cap is easily damaged by torsional fracture, causing the AC electrified conductive contact line support system to occur. Broken faults affect the reliability and safety of high-voltage transmission lines

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