Split Rogowski Coil Assembly for Current Measurement
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Solution Overview
Problem
Existing current measurement systems in electrical power systems face challenges in accurately sensing and measuring current without being influenced by external electromagnetic fields, particularly in microprocessor-based protection devices where precise location independence and ease of installation are crucial.
Innovation Solution
A split Rogowski coil assembly is used, comprising two distinct PCB assemblies with unconnected coil loops, each generating a voltage output that are connected in series to provide a combined voltage signal proportional to the current flowing through the conductor, effectively canceling external electromagnetic fields and simplifying installation by allowing separate placement and connection of the coil portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional Rogowski coil is used for current measurement, then measurement reliability is improved, but installation complexity increases and location independence is reduced
Solution Approach 1:
The Rogowski coil is divided into multiple separate coil portions (first coil portion, second coil portion, etc.) that can be independently installed around different sections of the conductor. Each coil portion generates its own voltage output signal, which is then combined with signals from other portions to achieve the complete measurement function, thereby simplifying installation while maintaining measurement reliability
2Measurement precision
If a single integrated Rogowski coil is used, then measurement accuracy is improved, but adaptability to different installation locations is reduced
Solution Approach 1:
The coil is segmented into multiple portions that can be independently positioned around the conductor at different locations. This segmentation allows the measurement system to adapt to various installation scenarios while maintaining measurement accuracy through the combination of voltage outputs from all portions
Solution Approach 2:
Each coil portion is designed to perform the same measurement function independently, allowing any combination of portions to contribute to the overall measurement. This universal design enables the system to adapt to different installation locations and conductor configurations while maintaining measurement precision
3Ease of operation
If multiple separate coil portions are used, then ease of installation is improved, but device complexity increases
Solution Approach 1:
The coil is divided into multiple separate portions that can be independently installed, simplifying the installation process. Each portion is a discrete unit that can be fitted around the conductor separately, reducing installation complexity despite the multi-component design
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 solution ensures accurate current measurement by canceling external electromagnetic interference and simplifies the installation process by allowing separate placement and connection of the coil portions, enhancing flexibility and ease of use while maintaining measurement accuracy.
Implementation Method 1
Current flowing through a conductor generates a magnetic field that, in turn, induces a voltage in the coil
Implementation Method 2
effectively canceling external electromagnetic fields
Data Source
AI summary
A split Rogowski coil assembly having distinct coil loops formed on printed circuit boards that are not joined to one another.