Stationary Induction Apparatus Tertiary Winding Segmentation
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Solution Overview
Problem
Conventional technologies are unable to reduce the impedance of a tertiary winding to near zero, which is necessary for specific applications like aluminum refining.
Innovation Solution
A stationary induction electric apparatus with a three-phase three-legged autotransformer structure, where the tertiary winding is divided into two parts, one part is arranged between the common winding and the series winding, and the other part between the common winding and the main leg iron core, allowing for the reduction of separation impedance to near zero.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the impedance of the tertiary winding is increased by reducing primary-to-secondary impedance, then the breaking capacity of the cut-off portion is reduced and electromagnetic mechanical force is suppressed, but the separation impedance of the tertiary winding cannot be reduced to near zero
Solution Approach 1:
The tertiary winding is divided into two separate windings: a first tertiary winding arranged between the main leg iron core and the common winding, and a second tertiary winding arranged between the common winding and the series winding. This segmentation allows each winding to be independently configured to achieve near-zero separation impedance while maintaining the required breaking capacity and electromagnetic mechanical force suppression.
Solution Approach 2:
The common winding serves as an intermediary element between the main leg iron core and the series winding, with the first and second tertiary windings arranged on opposite sides of it. This intermediary arrangement enables the tertiary windings to be positioned optimally for impedance reduction without compromising the overall transformer performance.
2Device complexity
If the tertiary winding is arranged in a conventional single position, then the structure is simple, but the separation impedance cannot be reduced to near zero
Solution Approach 1:
The tertiary winding function is segmented into two separate windings positioned at different locations on the main leg iron core. The first tertiary winding is placed between the main leg iron core and the common winding, while the second tertiary winding is placed between the common winding and the series winding. This segmentation enables near-zero separation impedance by allowing magnetic flux to couple effectively through both paths.
Solution Approach 2:
Instead of arranging the tertiary winding in a single position along one dimension, the invention utilizes both sides of the common winding, effectively adding a spatial dimension to the arrangement. This two-sided configuration enables the tertiary winding to achieve near-zero separation impedance by creating multiple magnetic coupling paths.
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 configuration effectively reduces the separation impedance of the tertiary winding to near zero, enhancing the apparatus's performance by adjusting the number of turns and inter-winding distances of the divided tertiary windings.
Implementation Method 1
a stationary induction electric apparatus according to claim 1, including a common winding, a series winding, and a tertiary winding arranged on a main leg iron core
Data Source
Figure 1~2
Figure 3
Figure 4A~4B
AI summary
Provided is a stationary induction electric apparatus including a common winding (LC), a series winding (LS), and a tertiary winding (LT) arranged on a main leg iron core (11), in which the tertiary winding is divided, and one of divided tertiary windings (LTa) and (LTb) is arranged between the common winding (LC) and the series winding (LS). This enables tertiary impedance to be reduced to near zero.