Toroidal Current Transformer Fabrication via Post-Mold Splitting
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Solution Overview
Problem
Current transformers (CTs) used in electric power delivery systems face misalignment issues during the fabrication process, leading to insufficient contact between core halves, which affects their ability to effectively sense current and harvest power.
Innovation Solution
The fabrication process involves molding the CT as a single piece and cutting it into halves after the overmolding process to ensure alignment and prevent misalignment, allowing for proper contact between core faces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the CT is molded as a single piece and cut into halves after overmolding, then alignment precision between core halves is improved, but manufacturing complexity increases
Solution Approach 1:
The core is molded as a single piece before being cut into halves. This preliminary action of maintaining the core as one unified structure during the overmolding process ensures that alignment features are established before the final splitting, guaranteeing precise alignment between core halves when assembled.
Solution Approach 2:
The toroidal core is divided into two separate halves that can be assembled around the conductor. This segmentation allows the CT to be opened for installation and provides flexibility in mounting, while the alignment features ensure the halves join precisely to maintain magnetic circuit integrity.
2Ease of operation
If the core is cut into halves for split core design, then ease of installation is improved, but contact between core faces deteriorates
Solution Approach 1:
Alignment features are incorporated into the core halves during the molding process, before the halves are separated. This preliminary establishment of alignment geometry ensures that when the halves are assembled during installation, they automatically achieve proper alignment and sufficient contact area between core faces.
Solution Approach 2:
Alignment features act as intermediaries between the two core halves, facilitating proper positioning and contact. These features serve as mechanical guides that ensure the core faces align correctly when the halves are brought together during installation.
3Measurement precision
If misalignment prevention measures are taken during fabrication, then measurement precision is improved, but manufacturing time increases
Solution Approach 1:
Alignment features are built into the core structure during the initial molding process, rather than requiring post-processing or adjustment operations. This preliminary incorporation of alignment geometry ensures measurement precision is achieved without adding significant fabrication time.
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 approach ensures sufficient contact between the core halves, enhancing the CT's ability to accurately measure current and harvest power, thereby improving the reliability of electric power delivery systems.
Implementation Method 1
The current on the conductor creates a magnetic field in the toroidal core that induces current in the windings proportional to the current on the conductor
Implementation Method 2
The current on the conductor creates a magnetic field in the toroidal core
Data Source
AI summary
The present disclosure relates to a fabrication process for a current transformer. For example, the process may include wrapping first windings around a first core half of a magnetic core of a current transformer. The process may include wrapping second windings around a second core half of the magnetic core. The magnetic core may be inserted into an overmold tool. The process may include overmolding a first overmold over the first core half of the magnetic core and a second overmold over the second core half of the magnetic core. After overmolding, the magnetic core may be cut in half.