I-Shaped Lamination Stack for Current Transformer Magnetic Coupling
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Solution Overview
Problem
Conventional current transformers suffer from inefficient magnetic coupling, leading to high power loss, large size, and reduced transformation efficiency, along with limited integration of electronics for condition monitoring and communication, which complicates preventative maintenance and increases manufacturing costs.
Innovation Solution
A current transformer design featuring an inline dual coil system with an integrated magnetic actuator and I-shaped lamination stack that improves magnetic coupling between the core plates, reducing physical dimensions and enhancing transformation efficiency, while incorporating embedded electronics for real-time monitoring and communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional magnetic core design is used, then the structure is simple, but magnetic coupling is inefficient leading to high power loss and large size
Solution Approach 1:
The magnetic core is divided into multiple I-shaped lamination segments that are stacked together. Each lamination has a specific orientation and shape designed to guide magnetic flux efficiently. This segmentation allows optimization of magnetic coupling while maintaining manageable structural complexity through modular assembly.
Solution Approach 2:
The patent employs composite magnetic core construction using multiple lamination materials with different magnetic properties. The I-shaped laminations are composed of ferromagnetic materials selected for optimal magnetic coupling characteristics. This composite approach improves power efficiency by reducing eddy current losses while managing the complexity through standardized material selection.
2Productivity
If conventional magnetic core design is used, then the structure is simple, but transformation efficiency is reduced
Solution Approach 1:
The magnetic core is divided into multiple I-shaped lamination segments that are stacked together. Each lamination has a specific orientation and shape designed to guide magnetic flux efficiently. This segmentation allows optimization of magnetic coupling while maintaining manageable structural complexity through modular assembly.
Solution Approach 2:
The I-shaped laminations introduce a new dimensional arrangement in the magnetic path, creating multiple flux paths through the core in different spatial dimensions. This multi-dimensional flux distribution improves transformation efficiency by reducing magnetic reluctance and enhancing coupling between primary and secondary windings.
3Measurement precision
If conventional magnetic core design is used, then manufacturing is simpler, but current measurement linearity is poor
Solution Approach 1:
The magnetic core is divided into multiple I-shaped lamination segments that are stacked together. Each lamination has a specific orientation and shape designed to guide magnetic flux efficiently. This segmentation allows optimization of magnetic coupling while maintaining manageable structural complexity through modular assembly.
Solution Approach 2:
The patent optimizes specific parameters of the I-shaped laminations including thickness, width, and stacking arrangement to achieve linear current measurement characteristics. By carefully controlling these geometric parameters and the resulting magnetic flux distribution, the system achieves improved measurement linearity while maintaining manufacturability through standardized lamination components.
4Reliability
If excessive magnetic flux is shunted away, then the magnetic circuit is protected, but breaker trip current becomes high compromising trip function
Solution Approach 1:
The I-shaped laminations are strategically positioned to create localized magnetic flux paths with different properties. The core structure provides different magnetic conductance in different regions, allowing optimal flux distribution that ensures sufficient flux reaches the trip mechanism while protecting other portions of the magnetic circuit.
Solution Approach 2:
The I-shaped lamination structure acts as an intermediary element that mediates magnetic flux distribution between the primary winding and the trip mechanism. It guides and regulates flux flow, ensuring adequate flux reaches the trip function while preventing excessive flux from causing premature tripping or compromising reliability.
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
The design achieves reduced size, higher transformation efficiency, improved current measurement linearity, and cost-effective integration of electronic overload protection, enabling faster response to short circuits and delayed overload shutdowns without heat generation issues.
Implementation Method 1
improving magnetic coupling between the core plates
Implementation Method 2
reducing the amount of shunted magnetic flux
Implementation Method 3
a primary coil component for providing current based short circuit protection
Implementation Method 4
a secondary coil component for providing voltage based overload protection
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
A system comprising a magnetic actuator, a current transformer and operational electronics in a dual-coil circuit breaker. The system includes an inline, but non concentric, implementation of the primary and secondary coils to maintain a narrow width suitable for retrofitting in standard industrial rack mounted enclosures. The system further comprises an I-shaped lamination stack that is designed to abut on the ends of an upper and lower plate of the current transformer. The I-shaped lamination stack significantly increases the overlap between the lamination and the upper and lower plates, which results in lower magnetic reluctance and improves magnetic coupling.