Rogowski Coil with Equidistant Turn Groups for Current Measurement
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Solution Overview
Problem
Current current measuring devices for electric power lines face challenges in precision due to external currents and centering issues, requiring complex installations and lacking insulation from medium and high voltage lines.
Innovation Solution
A current measuring device with a solenoid winding organized into equidistant groups of turns on a support body, allowing precise current measurement by minimizing the impact of external currents and centering deviations, and featuring a design that can be installed without disconnecting the electric cable, using a multilayer printed circuit for insulation and reduced installation complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a Rogowski coil with dense and uniform solenoid winding is used to reduce measurement errors, then measurement precision is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The support body is divided into multiple spacing sectors that are equidistantly distributed around the through hole. The solenoid winding is organized into groups of turns, with each group located in a specific spacing sector. This segmentation allows the complex winding to be systematically arranged and manufactured while maintaining measurement precision.
Solution Approach 2:
Different spacing sectors have different functions: some sectors contain solenoid windings while others are left empty or contain different components. This local differentiation optimizes the magnetic field distribution and reduces interference from external currents, improving measurement precision without requiring uniform dense winding throughout the entire circumference.
2Measurement precision
If a Rogowski coil with dense and uniform solenoid winding is used to reduce measurement errors, then measurement precision is improved, but ease of manufacture deteriorates
Solution Approach 1:
The support body is divided into multiple spacing sectors that are equidistantly distributed around the through hole. The solenoid winding is organized into groups of turns, with each group located in a specific spacing sector. This segmentation allows the complex winding to be systematically arranged and manufactured while maintaining measurement precision.
Solution Approach 2:
The patent specifies that the spacing sectors are equidistantly distributed and that the groups of turns are organized in a systematic pattern around the through hole. This regular geometric arrangement simplifies the manufacturing process by providing clear positioning guidelines, making it easier to reproduce the device with consistent measurement precision.
3Reliability
If traditional Rogowski coil installation methods are used, then current measurement function is achieved, but installation complexity increases due to need to disconnect electric cable
Solution Approach 1:
The support body is designed with a side opening that allows the electric cable to be inserted through the through hole while the device is in an open state. The front face can be opened to facilitate cable insertion and then closed to complete the measurement configuration. This dynamic opening mechanism enables installation without disconnecting the cable from the power line.
Solution Approach 2:
The side opening acts as an intermediary access point that allows the electric cable to pass through the support body structure during installation. This opening provides a pathway for the cable to be positioned correctly within the measurement device without requiring disconnection from the power line, simplifying the installation process.
4Measurement precision
If measurement device is placed close to electric cable for accurate measurement, then measurement precision is improved, but insulation from medium and high voltage lines becomes problematic
Solution Approach 1:
The support body serves as an intermediary structure that positions the solenoid windings close to the electric cable for accurate measurement while providing electrical insulation. The support body material and structure act as an insulating barrier between the measurement components and the high-voltage cable, enabling close placement without direct electrical contact.
Solution Approach 2:
The support body is designed as a structured enclosure that can be positioned close to the electric cable while maintaining insulation. The support body structure provides the necessary electrical isolation, allowing the measurement device to operate in proximity to medium and high voltage lines without compromising safety or measurement accuracy.
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 device provides high-precision current measurements that are not significantly affected by external currents or centering errors, with reduced installation complexity and suitability for medium and high voltage lines, ensuring reliable operation and insulation.
Implementation Method 1
the operating principle of the Rogowski coil is based on the measurement of the flux of the magnetic field concatenated with the turns of the solenoid winding along the aforesaid closed curve C
Implementation Method 2
According to Ampere's law, the circulation of the magnetic field H along the closed curve C is equal to the current concatenated with the closed curve C itself
Data Source
AI summary
Current measuring device (1) for electric power lines, which comprises an annular support body (3) made of insulating material provided with a through hole (4) for housing an electric cable (2), and a solenoid winding (8) provided with turns wound around the support body (3). The solenoid winding (8) is organized in multiple groups of turns (9), and such groups are positioned equally spaced apart from each other.