Aluminium Grounding Conductor with Conductive Polymer Coating
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Solution Overview
Problem
Conventional grounding conductors, particularly those made of bare copper, face corrosion issues due to soil moisture, acidity, and salt concentration, leading to potential disconnection and safety risks, while alternatives like aluminium are more prone to corrosion and have lower conductivity, necessitating a cost-effective and corrosion-resistant solution.
Innovation Solution
A grounding conductor comprising multiple conductive aluminium strands coated with an electrically conductive polymer material having a volume resistivity below 100 Ω·cm, which provides enhanced corrosion protection and conductivity even when damaged, reducing galvanic corrosion and improving lightning impulse removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bare copper is used as grounding conductor, then corrosion resistance is improved, but cost increases and mechanical strength decreases
Solution Approach 1:
The grounding conductor uses a composite structure with aluminium strands as the core material and a conductive polymer coating as the protective layer. This composite design combines the high strength-to-weight ratio and cost-effectiveness of aluminium with the corrosion resistance and conductivity of the polymer coating, resolving the contradiction between cost and corrosion resistance.
2Quantity of substance
If aluminium is used as grounding conductor, then cost decreases and mechanical strength improves, but corrosion resistance worsens and conductivity decreases
Solution Approach 1:
The conductive polymer coating acts as an intermediary layer between the aluminium grounding conductor and the corrosive soil environment. This intermediate protective layer prevents direct contact between the aluminium and corrosive elements while maintaining electrical conductivity, thus resolving the contradiction between cost and corrosion resistance.
3Reliability
If conductive polymer coating is applied to aluminium strands, then corrosion resistance is improved, but manufacturing complexity increases
Solution Approach 1:
The conductive polymer coating is formulated with specific parameter ranges: volume resistivity between 0.1-100 Ω·cm and thickness of 0.1-2.0 mm. By optimizing these parameters, the coating achieves effective corrosion protection and conductivity while maintaining manufacturability through standard extrusion processes, resolving the contradiction between corrosion resistance and manufacturing complexity.
4Reliability
If volume resistivity of polymer coating is reduced below 100 Ω·cm, then conductivity is improved, but material cost increases
Solution Approach 1:
The patent specifies a volume resistivity range of 0.1-100 Ω·cm for the conductive polymer coating. This parameter optimization balances conductivity requirements with material cost, allowing effective grounding performance while using cost-effective polymer compositions and thicknesses, thus resolving the contradiction between conductivity and material cost.
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 effectively reduces corrosion and maintains grounding capability, offering a cost-effective alternative to copper grounding conductors with improved mechanical strength and resistance to abrasion, suitable for use in various environmental conditions.
Implementation Method 1
each such strand is provided with at least one sheath comprising an electrically conductive polymer material having a volume resistivity (ρ) below 100 Ω·cm
Implementation Method 2
contact with the bare metal surface areas causes such conventional grounding conductors to be corroded by a battery action resulting from a difference in potential between ground and metal strand in these areas, leading to a direct current flowing here, causing what is called galvanic corrosion
Data Source
Figure 1~4
Figure 5A~8B
Figure 9~10
AI summary
The invention relates to a grounding conductor and an electrical system comprising such a grounding conductor (100) comprising a plurality of conductive aluminium strands (120) where each such strand is provided with at least one sheath (140) of an electrically conductive polymer material having a volume resistivity (ρ) below 100 Ω⋅cm. Elected for publication.