A Strong and Tough Porcelain Porcelain Insulator for High-Voltage Lines

Abstract

The invention discloses a strong pillar porcelain insulator for high-voltage lines, which comprises an insulator body, an upper steel cap and a lower steel cap. The insulator body has a bone cylinder, an upper core head and an The lower core head and the bone cylinder are provided with large and small umbrella skirts at intervals, the upper core head is provided with annular grooves and insertion grooves, the inner surface of the upper steel cap is provided with annular bosses at intervals, and the upper steel cap and Connectors are arranged between the upper core heads, annular grooves are arranged at intervals along the axial direction of the lower core head, annular grooves are arranged at intervals on the inner surface of the lower steel cap, and the lower steel cap and the lower core head There are clamping parts between them. The present invention has high mechanical strength, excellent electrical performance, stable and reliable quality, high mechanical impact resistance, strong pollution resistance, small maintenance workload, and low cost, which can fully meet the requirements of 110‑330KV Technical requirements for pillar porcelain insulators for high voltage transmission lines.

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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