Heat-Conducting Cable Route for Dense Underground Power Cables
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Solution Overview
Problem
The existing methods for laying high-voltage power cables underground face challenges such as inadequate heat dissipation, high space requirements, environmental impact, and increased costs due to the need for extensive space and specialized materials to manage heat and mechanical protection.
Innovation Solution
The use of a cable route element with a flat, heat-conducting element made of materials like steel or aluminum, or even plastic, that is designed to dissipate heat efficiently into the ground and provide mechanical protection for the power cables, allowing them to be laid closer together without overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-voltage cables are laid side by side at a horizontal distance dimensioned for sufficient heat dissipation, then the service life of the route is ensured, but the space required increases to 30 meters or more in width
Solution Approach 1:
The patent combines multiple functions into a single integrated structure: the sheet pile wall serves simultaneously as mechanical protection for the cables, as a heat-conducting element for thermal management, and as structural support. This merging eliminates the need for separate protective structures and reduces the overall space requirement while maintaining reliability.
Solution Approach 2:
The sheet pile wall is designed as a multi-functional element that provides mechanical protection, thermal conduction, and structural support all in one component. This universal approach allows the cable route to achieve reliable operation with reduced space requirements compared to conventional designs that use separate elements for each function.
2Loss of energy
If the ground thermal conductivity is low (approximately 0.3 W/mK), then heat dissipation from high-voltage cables is inadequate, but increasing cable spacing to improve heat dissipation further increases the space required
Solution Approach 1:
The sheet pile wall acts as an intermediary thermal conductor between the cables and the ground. With high thermal conductivity (λ ≥ 10 W/mK), it serves as a heat transfer mediator that overcomes the low thermal conductivity of the surrounding ground, enabling efficient heat dissipation without requiring increased cable spacing.
Solution Approach 2:
The patent changes the thermal conductivity parameter of the structure surrounding the cables by using sheet pile material with λ ≥ 10 W/mK, which is significantly higher than the ground's thermal conductivity (approximately 0.3 W/mK). This parameter change enables efficient heat transfer from the cables to the ground without increasing the cable spacing.
3Power
If high-voltage cables operate at high power, then electricity transmission capacity increases, but waste heat generation reaches approximately 200kW/km which must be dissipated to avoid exceeding material temperature limits
Solution Approach 1:
The patent converts the harmful waste heat into a useful resource by enabling its extraction and utilization for heating applications. The sheet pile wall's high thermal conductivity allows the waste heat to be efficiently transferred to a heating network, transforming the thermal problem into a beneficial dual-use system that supports both high-power transmission and heating supply.
4Loss of energy
If expensive bedding materials with improved thermal properties are used to embed the cables, then heat dissipation improves, but logistical effort and costs increase considerably
Solution Approach 1:
The patent replaces expensive specialized bedding materials with a more economical sheet pile structure that provides equivalent or superior thermal performance. The sheet pile wall achieves improved heat dissipation through its high thermal conductivity and structural design, eliminating the need for costly proprietary bedding materials and reducing both material costs and installation complexity.
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
This solution reduces the space required for the cable route, enhances heat dissipation, and increases the power density of the transmission lines, while also minimizing environmental impact and operational costs.
Implementation Method 1
a heat-conducting element for introduction into the ground and transferring the heat generated in the power cables into the ground and/or to a heat exchanger element
Data Source
Figure 1A
Figure 1B
Figure 1C~2
AI summary
Cable route for the underground laying of power cables with at least one flat heat conducting element, a plurality of power cables which are connected to the heat conducting element at a distance from one another and thermally coupled to transfer heat from the respective power cable to the heat conducting element, wherein the heat conducting element and the power cables are arranged in the ground.