Electrostatic ring capable of adjusting surface initial field intensity

Abstract

The invention relates to an electrostatic ring capable of adjusting surface initial field intensity, belonging to the technical field of a transformer. In the technical scheme, an electrostatic ring frame (1) is of an annular flat structure, the two end parts of the cross section of the electrostatic ring are beveled, and the bevel radius is 30-40 nanometers; and on the inner side and the outer side of the electrostatic ring and one side just opposite to a ground electrode, an insulation support (5) is arranged between an integrated insulation crepe paper and the electrostatic ring frame due to relatively large potential difference, so that the ratio of the insulation thickness of a coil side of the electrostatic ring to the insulation thickness of the ground electrode is 1:4. The electrostatic ring has the advantages that the thickness space of the electrostatic ring is fully utilized, the bevel angle R of a high-field intensity position of the electrostatic ring is increased, and the electrostatic ring insulation of the position is also thickened; meanwhile, the insulation thickness of a low-field intensity position of the electrostatic ring is reduced; and with the combination of electric field calculation, the initial field intensity of the electric field on the surface can be accurately controlled, and the insulation margin of the transformer is effectively increased.

Description

technical field [0001] The invention relates to an adjustable surface initial field strength electrostatic ring, which belongs to the technical field of transformers. Background technique [0002] As the voltage level of the transformer is getting higher and higher, the insulation distance is becoming more and more tense, and the initial field strength on the surface of the coil end is also getting higher and higher. The electrostatic ring structure is produced to deal with this situation. That is, an electrostatic ring is set in the high field strength area at the end of the coil to reduce the initial field strength and increase the insulation margin. Background Art The structure of the electrostatic ring is: an insulating ring skeleton inside, the chamfer R at the end of the skeleton is very large, aluminum foil crepe paper is wrapped around the skeleton, and a copper braided wire is arranged on the outer diameter side to ensure the distance between the aluminum foil crepe...

AI Technical Summary

Problems solved by technology

In the case of a higher voltage level, the chamfer R and insulation thickness of the skeleton end of the electrostatic ring are required to be larger

At the same time, in the case of a large insulation thickness, due to the shape of the electrode, the electrostatic ring cannot effectively protect the high field strength area of ​​​​the coil end cake, resulting in difficulty in structural design

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