Lightning Current Sensor Shielding and Asymmetric Winding
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Solution Overview
Problem
Existing magnetic detection sensors are not suitable for detecting high current and high voltage lightning strikes due to noise contamination from capacitative coupling, limiting their ability to accurately evaluate current flow during such events.
Innovation Solution
A lightning current detection sensor with an insulation-coated wire wound in multiple turns, shielded by a conductive band-like cover tape, and an electrical gap to prevent capacitative coupling, allowing for sensitive detection of magnetic fields while avoiding noise contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a general magnetic detection sensor is used to detect lightning current, then the sensor structure is simple, but noise contamination occurs due to capacitative coupling with high voltage and high current, making accurate detection difficult
Solution Approach 1:
The patent introduces a magnetic core as an intermediary substance that concentrates and guides the magnetic field produced by lightning current. The magnetic core with high permeability enhances the magnetic flux density in the detection region, allowing the pickup coil to more effectively detect the magnetic field while the shielding structure blocks electric field interference, thus resolving the contradiction between detection accuracy and noise resistance
Solution Approach 2:
The patent extracts and separates the magnetic field detection function from the electric field environment by using a shielded structure. The pickup coil is placed inside a shield that extracts the coil from the harmful electric field environment, allowing it to detect only the magnetic field component produced by lightning current without capacitative coupling noise
2Measurement precision
If a shield loop antenna is used to resist high current and high voltage, then noise contamination is avoided, but the sensor size increases due to the coaxial pipe structure, limiting detection area and resolution
Solution Approach 1:
The patent replaces the rigid coaxial pipe structure with a flexible shield made of conductive mesh or conductive film. This thin-film shield provides effective electromagnetic shielding against high voltage and high current while occupying minimal space, thus maintaining noise resistance without increasing sensor size and allowing for higher detection resolution
Solution Approach 2:
The patent transitions from a three-dimensional coaxial pipe structure to a two-dimensional planar shield configuration. The shield is arranged as a flat or curved surface surrounding the pickup coil, reducing the volume requirement while maintaining shielding effectiveness, thereby enabling compact sensor design with high detection resolution
3Measurement precision
If multiple turns of wire are wound to increase detection sensitivity, then sensitivity improves, but the sensor size increases, making installation difficult and reducing detection resolution
Solution Approach 1:
The patent uses an asymmetric winding configuration where the pickup coil is wound asymmetrically around the magnetic core, with more turns concentrated in regions of higher magnetic flux density. This asymmetric arrangement maximizes sensitivity in the primary detection direction while minimizing the overall footprint, allowing high sensitivity without proportionally increasing sensor size
Solution Approach 2:
The patent implements a nested structure where the pickup coil is wound around the magnetic core, which itself is positioned within the shield. This nested arrangement packs multiple functional elements (core, coil, shield) into a compact volume, enabling multiple turns for high sensitivity while maintaining a small overall sensor size for high resolution detection
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 sensor achieves high sensitivity and resolution in detecting magnetic fields during lightning strikes, effectively filtering out noise and ensuring accurate measurement of high current and high voltage conditions.
Implementation Method 1
a voltage generated at a wire end that constitutes the insulation-coated wire of the coil portion
Data Source
AI summary
The present invention has an object to provide a lightning current detection sensor that has a configuration resistant to high voltage and high current in a lightning strike and has high sensitivity and high resolution. In a lightning current detection sensor 10, an insulation-coated wire 22 wound in multiple turns is collectively covered with a base tape 21 and a cover tape 23. Thus, even when the insulation-coated wire 22 is wound in multiple turns to increase sensitivity, a minute area can be detected to increase resolution. Also, with the base tape 21 and the cover tape 23 covering the insulation-coated wire 22 and also a shield portion 12 made of an insulating material and a gap 40 formed between the shield portion 12 and the coil portion 20, a sufficient shielding property is ensured and detection with high accuracy can be performed against high current and high voltage without capacitative coupling.