PCB Rogowski Bushing Transformer With Adaptive Noise Cancellation
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Solution Overview
Problem
Bushing current transformers face challenges with accuracy and space limitations, as they need to balance between metering and protection requirements, often resulting in inaccuracy at low currents and increased tank size due to separate core designs for each purpose.
Innovation Solution
A Rogowski coil based bushing current transformer with a printed circuit board (PCB) Rogowski coil, top and bottom insulation layers, and an adaptive noise cancellation circuit, which allows for accurate current measurement, reduced manufacturing costs, and simplified installation, while accommodating both metering and protection functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a larger cross-section magnetic core is used to avoid saturation during high fault currents for protection CT function, then protection capability is improved, but measurement accuracy for low amplitude currents deteriorates
Solution Approach 1:
The patent divides the current transformer into two separate functional units: a protection CT with larger core cross-section for high-current fault detection, and a metering CT with smaller core cross-section for accurate low-current measurement. This segmentation allows each unit to be optimized for its specific function without compromise
Solution Approach 2:
The patent combines both protection and metering current transformer functions into a single integrated device that can perform both high-current fault protection and precise low-current measurement simultaneously, eliminating the need for separate devices
2Adaptability or versatility
If separate CTs are designed for metering and protection purposes, then functional requirements are improved, but device complexity and tank size increase
Solution Approach 1:
The patent merges the protection CT and metering CT into a single integrated bushing current transformer assembly, where both functional units share common structural elements and mounting infrastructure, thereby reducing overall device complexity and installation space while maintaining both protection and metering capabilities
3Adaptability or versatility
If traditional BCT design is used with separate windings for metering and protection, then dual functionality is achieved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent employs different core cross-section parameters for the protection and metering CTs within the same device. The protection CT uses a larger core cross-section to prevent saturation during high fault currents, while the metering CT uses a smaller core cross-section for accurate low-current measurement, allowing each function to be optimized through parameter variation
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 Rogowski coil design enhances measurement accuracy and reliability, reduces manufacturing costs, and simplifies installation, addressing the dual requirements of metering and protection while minimizing physical space, and integrates adaptive noise cancellation and temperature sensing for improved performance in high-voltage power systems.
Implementation Method 1
A Rogowski coil is a type of current transformer that uses a flexible, toroidal coil to measure current
Data Source
AI summary
A Rogowski integrator kit, equipped with RJ45 socket, that provides simple installation and protection against Electromagnetic Interference (EMI) and Electrostatic Discharge (ESD). The kit consists of a Rogowski coil that comes with a first RJ45 socket and an electrical integrator that includes a second RJ45 socket. With these features, the Rogowski integrator kit ensures reliable and accurate measurement in a safe and secure manner.