Steel-Core Copper-Clad Ground Conductor for Lower Copper Use
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Solution Overview
Problem
Traditional 4/0 copper ground conductors are expensive due to high copper content and are attractive targets for theft, while also having a shorter lifetime underground than desired.
Innovation Solution
A ground conductor design featuring a core made of at least 95% steel by weight, surrounded by a sheath with at least one layer of 95% copper by weight, with a specific ratio of width to thickness and dimensions that balance cost, durability, and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional 4/0 copper ground conductors are used, then excellent conductivity and ease of installation are achieved, but high cost and vulnerability to theft occur
Solution Approach 1:
The patent applies composite materials by combining steel core with copper cladding to create a ground conductor that integrates the high strength and low cost of steel with the excellent conductivity of copper. The steel core provides structural integrity and cost savings, while the copper cladding ensures adequate electrical conductivity for grounding applications.
Solution Approach 2:
The patent applies local quality by concentrating copper only in the cladding layers where electrical conductivity is needed, rather than using copper throughout the entire conductor. This localized application of expensive material optimizes the balance between conductivity requirements and cost reduction.
2Reliability
If traditional 4/0 copper ground conductors are used, then good electro-thermal capacity is achieved, but shortened lifetime underground occurs
Solution Approach 1:
The steel core provides superior mechanical strength and corrosion resistance compared to pure copper, extending the service life underground. The copper cladding maintains adequate electro-thermal capacity for grounding applications while the steel core protects against environmental degradation.
Solution Approach 2:
The steel core acts as a protective cushion against corrosion and mechanical damage that would otherwise affect the copper conductor directly. This pre-protective structure extends the lifetime by shielding the copper from harsh underground conditions.
3Quantity of substance
If copper content is reduced to lower cost, then theft resistance improves, but manufacturing complexity increases
Solution Approach 1:
The composite structure of steel core with copper cladding is designed to be manufacturable using established processes. The geometry and material distribution are optimized to balance complexity with production feasibility, ensuring that the reduced copper content does not come at the expense of excessive manufacturing complexity.
Data Source
AI summary
Ground conductors are disclosed. The ground conductors can include a core made primarily of a first material, such as steel. The ground conductor can include a surrounding sheath, which includes at least one layer made primarily of a second material, such as copper. The ground conductor has a ratio between its width and its thickness of no less than 11.1:1.