Current Transformer Parallel Branches for Compact High-Current Sensing
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Solution Overview
Problem
Conventional current transformers have limitations in size and weight due to their single primary winding design, which restricts their ability to handle high current ratings efficiently and compactly.
Innovation Solution
A current transformer with multiple primary winding branches configured in parallel, allowing the primary current to be divided among them based on impedance, with each branch connected to a secondary winding that induces a proportional secondary current, reducing the number of turns required in the secondary winding and thereby minimizing the size and weight of the transformer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single primary winding is used in conventional current transformers, then the structure is simple, but the size and weight increase when handling high current ratings
Solution Approach 1:
The primary winding is divided into multiple parallel branches, each carrying a portion of the total primary current. This segmentation allows the magnetic flux in each branch to be reduced proportionally, enabling the use of fewer secondary winding turns and smaller core cross-sectional area, thereby reducing the overall transformer size and weight while maintaining the same current transformation capability
2Device complexity
If a single primary winding is used in conventional current transformers, then the design is straightforward, but the volume increases for high current applications
Solution Approach 1:
The primary winding is segmented into multiple parallel branches, which reduces the current magnitude in each branch. This allows for a smaller core cross-sectional area and fewer secondary winding turns, significantly reducing the transformer volume for high current applications
Solution Approach 2:
The patent introduces a new structural dimension by arranging multiple primary winding branches in parallel, transforming the single-path current flow into a multi-path configuration. This dimensional change in the winding structure enables more efficient space utilization and reduces the overall transformer volume
3Weight of stationary object
If multiple primary winding branches are used, then the transformer size and weight are reduced, but the winding structure becomes more complex
Solution Approach 1:
The primary winding is divided into multiple parallel branches with simplified connection structures. Each branch is designed with uniform or systematically varied parameters, making the complexity manageable through modular design principles while achieving significant weight reduction
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 enables the current transformer to be more compact and lightweight, capable of handling higher current ratings and reducing the size and weight significantly compared to conventional transformers, making it more suitable for applications requiring high current handling and space efficiency.
Implementation Method 1
secondary windings having a plurality of turns configured to induce a secondary current from at least one of the one or more of the primary winding branches
Data Source
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AI summary
Embodiments described herein comprise a current transformer having a primary winding with multiple primary parallel branches that divide the primary current, and a secondary winding which is placed in any one, or more, branches. The current thus divided in the primary branches produces an alternating magnetic flux which induces alternating current in the secondary winding for an end user application. The invention disclosed herein reduces the weight and size of the current transformer drastically compared to the existing conventional current transformers.