Segmented Grounding Cable for High-Frequency Overtone Deflection
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Solution Overview
Problem
Conventional grounding devices are inadequate for efficiently deflecting overtones and reducing high impedances in high-frequency electric installations, particularly those with extensive electronic equipment, leading to disruptions and safety concerns for sensitive individuals.
Innovation Solution
A cable combination with a large number of thin copper wires in the inner core and thicker copper wires in the outer layer, buried deep in a borehole to maximize contact with water, effectively deflecting overtones and reducing electromagnetic fields and fault currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional grounding devices are used, then the grounding structure is simple and easy to install, but the ability to deflect overtones and reduce high impedances at high frequencies is insufficient
Solution Approach 1:
The grounding cable is segmented into an inner core with multiple thin wires (370 wires of 0.5mm diameter) and an outer layer with fewer thicker wires (18 wires of 2.2mm diameter). This segmentation allows the inner core to effectively deflect high-frequency overtones while the outer layer provides mechanical strength and low-frequency conductivity, resolving the contradiction between grounding efficiency and structural simplicity.
Solution Approach 2:
The cable combines copper wires of different diameters and configurations in a composite structure. The inner core uses thin copper wires optimized for high-frequency current deflection, while the outer layer uses thicker copper wires for mechanical protection and low-frequency grounding, achieving both high grounding efficiency and structural integrity.
2Reliability
If the cable is buried deep in a borehole to maximize contact with water, then grounding efficiency improves with resistance as low as 0.01Ω, but installation complexity and cost increase
Solution Approach 1:
The cable is pre-configured with the optimal inner core/outer layer wire configuration before installation. This preliminary preparation ensures that when the cable is installed in the borehole, it immediately provides the designed grounding performance without requiring complex on-site assembly or adjustment, reducing installation complexity while maintaining high grounding efficiency.
3Reliability
If a large number of thin wires are used in the inner core, then the ability to deflect overtones improves, but the manufacturing precision requirements increase
Solution Approach 1:
The segmentation into inner core and outer layer with specific wire counts (370 thin wires vs. 18 thick wires) and dimensions (0.5mm vs. 2.2mm diameter) creates a manufacturable design. The repetitive pattern of thin wires in the inner core can be efficiently produced using standard wire drawing and stranding techniques, achieving the required overtone deflection capability without excessive manufacturing precision requirements.
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 solution achieves extremely efficient grounding, reducing overtones and electromagnetic fields, allowing sensitive individuals to safely occupy the area and minimizing risks of aerial effects, with measured resistance as low as 0.01Ω and electromagnetic field reductions to 0.02 microtesla.
Implementation Method 1
The cable includes an inner core 1 which is surrounded by an outer layer 2. The inner core 1 includes a large number of twisted relatively thin wires. The outer layer 2 surrounding the core 1 includes a sufficient number of thicker wires for enclosing the inner core 1
Data Source
AI summary
A device for establishing grounding of an installation of different types includes one or more cables, wherein a ground rail or a ground conductor, ground rails or ground conductors, or a ground point or ground points are grounded by the one or more cables including a combination of electrically conductive wires or conductors in at least one inner core and at least one outer layer which surrounds the inner core wholly or partly, and a bore extending, in at least one of ground and a rock, with a depth of more than 100 m. The one or more cables are laid in the bore. The electrically conductive wires or conductors in the at least one inner core include hundreds of thin conductors surrounded by the at least one outer layer that includes coarse conductors having a diameter at least two times more than a diameter of the thin conductors.