Voltage-regulating winding end part insulating structure for controlling creepage for transformer

Abstract

The invention relates to a voltage-regulating winding end part insulating structure for controlling creepage for a transformer, and belongs to the technical field of a transformer manufacturing process. According to a technical scheme, a voltage-regulating winding adopts a dual-layer cylinder type structure; a multilayer thick paper tube-supporting strip structure (1) is arranged at the upper end of the voltage-regulating winding (3); and a multilayer positive and negative angle ring mutual-enfolding structure (2) is arranged between a static ring (4) of the voltage-regulating winding (3) and the thick paper tube-supporting strip structure (1), so that an effect of optimizing creepage field strength on two directions is achieved. The voltage-regulating winding end part insulating structure has the beneficial effects as follows: the end part edge of the multilayer thick paper tube-supporting strip structure is arranged at the upper end of the voltage-regulating winding of an ultra-high-voltage converter transformer, so that a creepage path on the surface of an oil tank on a high-potential region at grid side winding end part can be controlled; and therefore, the insulation level of the ultra-high-voltage converter transformer is effectively lowered, and the safety operation of the converter transformer is ensured.

Description

technical field [0001] The invention relates to an insulating structure at the end of a voltage regulating winding for controlling creepage of a transformer, and belongs to the technical field of transformer manufacturing technology. Background technique [0002] With the continuous development of my country's power transmission projects, the power grid transmission voltage continues to increase. At the same time, in recent years, the country has vigorously promoted the direct current transmission project, and the grid-side 750kV and 1000kV voltage level converters are gradually applied to the project construction. After the voltage level of the grid side is increased, in order to ensure the insulation distance, the grid side winding and voltage regulating winding are generally placed outside. Since the UHV grid-side winding withstands high voltage, it is very easy to form creepage breakdown to the box wall through the surface of the end ring on the upper part of the voltag...

AI Technical Summary

Problems solved by technology

Due to the high voltage of the UHV network side winding, it is very easy to form creepage breakdown to the box wall through the surface of the end ring on the upper part of the voltage regulating winding in the radial direction.

At the same time, when the end of the grid side radially goes out, it is easy to form creepage breakdown on the voltage regulating winding in the axial direction through the paper tube or end ring

The creepage paths in these two directions restrict each other. When designing the insulation structure, the creepage path in one direction is often cut off, which makes the creepage distance in the other direction too long.

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