Extra-high-voltage alternating current transformer bushing

Abstract

The invention relates to an extra-high-voltage alternating current transformer bushing. The extra-high-voltage alternating current transformer bushing comprises an upper insulating part and a lower insulating part which are fixed on the two sides of a grounding cylinder respectively, a high-voltage electrode which runs through the upper insulating part and the lower insulating part, and a grounding electrode which is fixed on the inner wall of the grounding cylinder, wherein the upper insulating part is provided with an upper insulating upper joint and an upper insulating lower joint which are connected into a whole through an upper end transitional plate; the lower insulating part is provided with a lower insulating upper joint and a lower insulating lower joint which are connected into a whole through a lower end transitional plate; an intermediate electrode which is arranged between the grounding electrode and the high-voltage electrode is arranged in the upper insulating part and the lower insulating part; and the upper and lower ends of the intermediate electrode are fixed through the upper end transitional plate and the lower end transitional plate. Compared with the conventional transformer bushing, the extra-high-voltage alternating current transformer bushing provided by the invention has the advantages of short production period, light weight, low manufacturing cost, high bending strength, safe and reliable operation, capability of remarkably improving the electrical performance, and the like.

Description

technical field [0001] The invention relates to a UHV bushing, in particular to a UHV AC transformer bushing with a new structure, which is mainly used for transformers with a voltage level of 750kV and above. Background technique [0002] At present, UHV AC transformer bushings for transformers are mainly divided into two types: oil-paper capacitive type and glue-impregnated paper capacitive type. Porcelain bushings are generally used for external insulation, and the height of the porcelain bushings is greater than 7m. Affected by the manufacturing process of porcelain parts, the porcelain bushings are single After the knuckle is fired, it is fired twice by bonding, so the production cycle of the porcelain piece is long, the qualified rate is low, and the manufacturing cost is high. The core of the main insulation capacitor passes through several electrodes to uniform voltage, the number of electrodes exceeds one hundred, the diameter of the core is particularly large, and ...

AI Technical Summary

Problems solved by technology

[0002] At present, UHV AC transformer bushings for transformers are mainly divided into two types: oil-paper capacitive type and glue-impregnated paper capacitive type. Porcelain bushings are generally used for external insulation, and the height of the porcelain bushings is greater than 7m. Affected by the manufacturing process of porcelain parts, the porcelain bushings are single After the knuckle is fired, it is fired twice by bonding, the production cycle of the porcelain parts is long, the pass rate is low, and the manufacturing cost is high

The core of the main insulation capacitor passes through several electrodes to uniform voltage, the number of electrodes exceeds one hundred, the diameter of the core is particularly large, and the process cycle is very long. Any defect between electrodes in the manufacturing process will lead to unqualified electrical performance of the product

The bushing is under the comprehensive influence of voltage, current, tension, vibration, wind, earthquake and other aspects during operation. Once there is a fault, there is a risk of explosion and fire

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