Preparation method of AC 500kV GIS internal insulation support and pillars and support for DC converter station engineering

By using insulating support made of aluminum oxide-based silicon nitride complex phase ceramics, the problem of difficult operational reliability of epoxy resin-based insulating support is solved, and high-strength, aging resistance and flashover resistance are achieved, which significantly improves the operating reliability of GIS equipment under ultra-high voltage conditions.

CN115497696BActive Publication Date: 2025-04-29SINOMA JIANGXI ELECTRICAL PORCELAIN ELECTRIC CO LTD +1
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Patent Information

Application Number
CN202211141154.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-09-20
Publication Date
2025-04-29
Estimated Expiration
2042-09-20

AI Technical Summary

Technical Problem

In existing GIS equipment, the operating reliability of epoxy resin-based insulated support is difficult to ensure under complex multi-stress conditions, the electrical parameters are sensitive to temperature, severe surface electric field distortion, and frequent faults in the ultra-high voltage field.

Method used

Alumina-based silicon nitride composite ceramic is used as the pillar body, with a reasonable structure and a simple and scientific formula. The prepared ceramic insulated support is characterized by high strength, aging resistance, flashover resistance, and low surface charge aggregation.

Benefits of technology

The high strength, aging resistance and flashover resistance of ceramic insulated support are achieved, which reduces surface charge aggregation and significantly improves the operating reliability of GIS equipment under ultra-high voltage conditions.

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Abstract

The present invention relates to an AC 500kV GIS internal insulating support for a DC converter station project and a method for preparing the support and the support, and belongs to the technical field of basic materials for electric power equipment. The internal insulating support described in the present invention includes a ceramic insulating support, a hardware, and an adhesive, wherein: the ceramic insulating support adopts alumina-based silicon nitride composite ceramics, including the following raw materials in weight percentage: 76-84% alumina, 5.5-10.0% kaolin, 8.8-13% silicon nitride, 0-5% nano-silicon dioxide, 0.8-1.5% carbonate minerals, 0.1-0.7% barium carbonate; and 0.3-1.5% PVA and 45-50% anhydrous ethanol. The formula design of the present invention is simple and scientific, and the prepared internal insulating support has the characteristics of high strength, aging resistance, anti-flashover, and less surface charge accumulation; the present invention also provides a simple and easy preparation method for the ceramic insulating support and the support.
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Citation Information

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