Step-Lap Transformer Core Structure for Corrosion-Resistant Joints
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Solution Overview
Problem
Submersible dry-type transformers are prone to corrosion due to harsh environmental exposure, which affects their electromagnetic performance, and existing laminated core constructions struggle to adequately protect the transformer core from corrosion, especially in areas with water, humidity, and pollution.
Innovation Solution
A step-lap sequence laminated core construction method where laminations of varying lengths are stacked to form joints with enlarged valleys, allowing for better application and protection by anti-corrosive coatings, reducing manufacturing complexity and improving magnetic flux flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional laminated core construction is used, then manufacturing is simpler, but corrosion resistance is insufficient in harsh environments
Solution Approach 1:
The core is divided into multiple laminations with varying lengths arranged in a step-lap sequence, creating segmented joints with enlarged valleys. This segmentation allows anti-corrosive coatings to be effectively applied and retained in the joint areas, significantly improving corrosion resistance while maintaining manageable construction complexity through systematic arrangement of the segmented parts.
Solution Approach 2:
The step-lap sequence creates local variations in lamination lengths, producing enlarged valleys at specific joint locations. These localized structural modifications concentrate corrosion protection efforts where they are most needed (at the joints), while the rest of the core maintains its standard construction, thus improving overall corrosion resistance without uniformly increasing complexity throughout the entire core structure.
2Reliability
If laminations are stacked with varying lengths to form step-lap joints, then corrosion protection is improved, but manufacturing complexity increases
Solution Approach 1:
The laminations are pre-configured with varying lengths and arranged in a predetermined step-lap sequence before assembly. This preliminary preparation of the lamination dimensions and arrangement pattern simplifies the actual assembly process, as the components are designed to fit together systematically rather than requiring complex adjustments during assembly, thus improving anti-corrosion performance while maintaining ease of manufacture.
3Loss of energy
If at least four identical laminations are stacked directly to each other in the step-lap sequence, then magnetic flux flow is improved, but the number of laminations increases
Solution Approach 1:
Four or more identical laminations are stacked directly to each other in sequence, merging their magnetic paths to create continuous, unbroken magnetic flux flow channels. This merging reduces magnetic flux losses by eliminating air gaps and discontinuities that would otherwise occur at joint locations, thereby improving magnetic flux efficiency. The systematic stacking pattern allows this benefit to be achieved with a manageable increase in lamination quantity through efficient space utilization.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances corrosive resistance, reduces transformer noise, and improves overall performance by ensuring effective protection of the transformer core from harsh environments and maintaining magnetic flux efficiency.
Implementation Method 1
improving magnetic flux flow
Implementation Method 2
laminated core construction
Data Source
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AI summary
A transformer core for a dry-type transformer includes a laminated construction having several groups of stacked laminations that form a step-lap sequence of laminations. Each group in the step-lap sequence has a mean length different than an adjacent group in the step-lap sequence and has at least two identical laminations per group, wherein at least one group has at least four identical laminations. Methods of assembling a transformer core are also provided, as are other aspects.