Low voltage foil winding structure of three-dimensional winding transformer Analysis of the Impact of Load Loss
Abstract: Transformers are an important component of power systems, and load loss is an important technical indicator of transformers. In response to the problem of large calculation errors in load losses of small capacity amorphous alloy solid coil transformers, the author of this article takes a 400kVA amorphous alloy solid coil transformer as an example to study the influence of low-voltage leads on load losses, calculate the various components of load losses, and compare and analyze the calculated values with experimental values. The total load loss error is about 2.1%. Research has found that the low-voltage side lead structure has a significant impact on load losses. When the low-voltage side foil winding is connected to the lead, it causes uneven current distribution in the foil winding, resulting in additional losses on the winding that can reach 2.6% of the DC resistance loss of the winding; Whether the simulation model includes low-voltage leads or not, the calculated simulation value of structural component losses has an error of 2.3% of the basic copper loss. When calculating the eddy current loss of structural components through simulation, the simulation model with low-voltage leads should be used.
Keywords: three-dimensional winding transformer; Load loss; Foil winding wire structure; Simulation calculation
Three dimensional model of transformer
Three dimensional model of low-voltage lead
(a) Actual structural model (b) Equivalent model
(a) Actual structural model (b) Equivalent model
Current distribution of foil winding (small capacity)
(a) Model 1 (b) Model 2
Simulation Model of Small Capacity Amorphous Alloy Three Dimensional Coil Transformer
capacity/kVA
Ratio of bias current loss and structural component loss to basic copper loss
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