Stationary Induction Apparatus Insulating Barrier Segmentation
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Solution Overview
Problem
The existing insulating barrier in stationary induction apparatuses fails to prevent electric discharges from occurring between winding ends, particularly due to air bubbles trapped within the folded portions, which compromises the insulating performance.
Innovation Solution
A novel insulating barrier design with radially extending segments that cover the outer peripheral ends of winding layers, preventing electric discharges by increasing the creepage distance and ensuring the insulating oil permeates between these segments, reducing the likelihood of air bubble formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insulating sheet is folded back to form an insulating barrier, then the insulating barrier is formed, but air bubbles are likely to remain inside the folded portion causing electric discharge
Solution Approach 1:
The insulating barrier is divided into multiple extensions (first extension, second extension, third extension, fourth extension) that are arranged to cover winding ends from multiple directions. This segmentation allows the insulating barrier to enclose air bubbles more effectively and prevent their harmful effects while maintaining insulating performance.
Solution Approach 2:
The insulating oil serves as an intermediary that fills the spaces between the extensions of the insulating barrier. The insulating oil permeates between the extensions to eliminate air bubbles and prevent electric discharge, while the extensions themselves act as intermediaries to guide and contain the insulating oil in critical areas.
2Device complexity
If a simple folded insulating barrier is used, then the structure is simple, but it fails to prevent electric discharge progression from both sides of the winding
Solution Approach 1:
The insulating barrier is segmented into four distinct extensions that extend in different directions (radially outwardly and axially) to cover both ends of the winding. This segmentation enables the barrier to prevent electric discharge progression from both sides simultaneously while maintaining structural clarity and ease of understanding.
Solution Approach 2:
The insulating barrier transitions from a simple two-dimensional folded sheet to a three-dimensional structure with extensions that protrude radially outwardly and extend axially. This dimensional change allows the barrier to cover winding ends more comprehensively and prevent electric discharge from multiple directions.
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 prevents electric discharges from progressing across the winding ends and restricts discharge generation due to air bubbles, thereby stabilizing the insulating performance of the stationary induction apparatus.
Implementation Method 1
an insulating oil in which each of the winding and the insulating barrier is immersed
Implementation Method 2
a second extension bent from an end of the first extension, extending toward one side in the central axis direction, and covering at least a part of one outer peripheral end of the outer peripheral ends
Data Source
AI summary
A stationary induction apparatus includes a winding formed of a plurality of winding layers disposed in a central axis direction, an insulating barrier and an insulating oil. The insulating barrier includes a first extension extending radially outwardly of the winding and partitioning the outer peripheral ends, a second extension bent from an end of the first extension, extending toward one side in the central axis direction, and covering at least a part of one outer peripheral end of the outer peripheral ends, a third extension bent from an end of the second extension and extending radially outwardly of the winding, and a fourth extension bent from an end of the third extension, extending toward the other side in the central axis direction, and covering at least a part of the other outer peripheral end of the outer peripheral ends. The fourth extension faces the second extension with a spacing therebetween.