Wound Core Heat Transmission Paths for Transformer Cooling
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Solution Overview
Problem
Transformers using wound cores face issues with heat dissipation, leading to insulation paper deterioration and potential breakdown due to insufficient heat dissipation from the wound core, which is primarily addressed by enhancing the heat dissipation surface area.
Innovation Solution
The wound core design incorporates a laminated body with stacked electrical steel sheets and block-shaped portions featuring heat transmission paths, such as gap portions or heat transfer bodies, to enhance heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the wound core is housed in insulating oil for heat dissipation, then the heat dissipation capability is improved, but the heat dissipation is insufficient because the insulating oil only contacts the wound core surface
Solution Approach 1:
The patent transitions from surface-level heat dissipation (2D contact) to volumetric heat dissipation (3D integration) by embedding heat dissipation members within the stacked electrical steel sheets. This dimensional change allows heat to be dissipated from the interior volume of the wound core, not just from the external surface, thereby significantly improving heat dissipation efficiency.
Solution Approach 2:
The patent introduces heat dissipation members (such as metal sheets or particles) as intermediary substances between the electrical steel sheets. These intermediaries facilitate heat transfer from the core to the insulating oil by providing additional thermal conduction paths and increasing the effective heat transfer surface area within the core structure.
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
This design effectively suppresses temperature rise and maintains low iron loss by increasing the heat dissipation capacity of the wound core.
Implementation Method 1
One block-shaped portion among the plural block-shaped portions includes at least one heat transmission path between the stacked electrical steel sheets
Implementation Method 2
the heat in the wound core is dissipated by the reservoir of this insulating oil
Data Source
AI summary
A wound core equipped with a laminated body including plural electrical steel sheets stacked in a ring shape in side view. The laminated body includes plural bent portions, and plural block-shaped portions at positions between adjacent bent portions. At least one block-shaped portion among the plural block-shaped portions includes a heat transmission path bordered by the electrical steel sheets at least at a portion between the stacked electrical steel sheets. The heat transmission path is included only at the at least one block-shaped portion.