Transformer winding and method for constructing transformer winding
AssigneeEaton Intelligent Power Limited
InventorsJianxiong Yu, Cheng Luo, Jiajie Duan, Cheng Wang
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Abstract
Provided are a transformer winding and a method for constructing a transformer winding. The transformer winding includes: a lead wire of a winding conductor of the transformer winding; an insulating layer wrapping the lead wire; a ground shielding layer covering a side, close to the winding conductor, of the insulating layer; and a stress grading material layer, which is made of a semi-conductive material, covers a side, away from the winding conductor, of the insulating layer, and is electrically connected to the ground shielding layer, where the stress grading material layer is impedance-matched with the insulating layer.
Claims20
A transformer winding, comprising:
- an outlet terminal, the outlet terminal comprising:
- a lead wire of a winding conductor of the transformer winding;
- an insulating layer at least partially surrounding the lead wire;
- a ground shielding layer disposed on a first side of the insulating layer, proximate to the winding conductor;
- and
- a stress grading material layer disposed on a second side of the insulating layer, away from the winding conductor, wherein the stress grading material layer is made of a semi-conductive material, is electrically connected to the ground shielding layer, and is impedance-matched with the insulating layer.
A method for constructing a transformer winding, the method comprising:
- determining a length of an outlet terminal of the transformer winding based on a creepage distance corresponding to a design voltage;
- obtaining along-surface electric field strength distributions of the outlet terminal under varying lengths of a stress grading material layer by performing a finite element analysis, the finite element analysis considering characteristic conductivity, non-linear coefficient, dielectric constant, and thickness of the stress grading material layer and an insulating layer;
- and
- obtaining a length of the stress grading material layer such that the along-surface electric field strength at the outlet terminal is maintained below an upper limit threshold.
Dependencies are inferred from the claim text.