Armoured Cable with Recurrent Direction Reversals
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Solution Overview
Problem
Armoured AC cables face challenges in mechanical stability and loss reduction, particularly when using ferromagnetic materials for the armour layer, as unilay configurations reduce losses but compromise mechanical performance, while contralay configurations improve mechanical stability but increase losses.
Innovation Solution
The armoured cable design features recurrent reversals of the core stranding and armour winding directions along the cable length, creating sections where both directions are the same (unilay) and alternating with sections where they are opposite (contralay), reducing losses and enhancing mechanical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If unilay configuration is used (armour winding direction same as core stranding direction), then losses are reduced, but mechanical stability deteriorates
Solution Approach 1:
The cable is divided into multiple sections along its length, with each section having a specific armour winding direction. The direction is changed at predetermined points, creating segments with different configurations. This segmentation allows the cable to achieve low losses in unilay sections while maintaining mechanical stability through contralay sections.
Solution Approach 2:
The armour winding direction is periodically reversed along the cable length according to a predetermined pattern. This periodic action creates alternating unilay and contralay sections, enabling the cable to cycle between low-loss configuration and high-stability configuration, thereby achieving both objectives over the entire cable length.
2Stability of the object's composition
If contralay configuration is used (armour winding direction opposite to core stranding direction), then mechanical stability is improved, but losses increase
Solution Approach 1:
The cable is divided into multiple sections along its length, with each section having a specific armour winding direction. The direction is changed at predetermined points, creating segments with different configurations. This segmentation allows the cable to achieve low losses in unilay sections while maintaining mechanical stability through contralay sections.
Solution Approach 2:
The armour winding direction is periodically reversed along the cable length according to a predetermined pattern. This periodic action creates alternating unilay and contralay sections, enabling the cable to cycle between low-loss configuration and high-stability configuration, thereby achieving both objectives over the entire cable length.
3Quantity of substance
If ferromagnetic material is used for armour layer, then cost is reduced, but losses increase due to magnetic field effects
Solution Approach 1:
The cable is divided into multiple sections along its length, with each section having a specific armour winding direction. The direction is changed at predetermined points, creating segments with different configurations. This segmentation allows the cable to achieve low losses in unilay sections while maintaining mechanical stability through contralay sections.
Solution Approach 2:
The armour winding direction is periodically reversed along the cable length according to a predetermined pattern. This periodic action creates alternating unilay and contralay sections, enabling the cable to cycle between low-loss configuration and high-stability configuration, thereby achieving both objectives over the entire cable length.
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 design reduces armour and screen losses, allowing for increased current capacity and reduced conductor cross-section area, improving mechanical performance and efficiency compared to uniform configurations, while maintaining acceptable mechanical stability during deployment.
Implementation Method 1
losses are related to the magnetic field generated by AC current transported by the electric conductors, which causes eddy currents in the layers surrounding the cores (like, for example, the metal screen and the wires of the armour) and magnetic hysteresis of the ferromagnetic wires of the armour
Implementation Method 2
losses are related to the magnetic field generated by AC current transported by the electric conductors, which causes eddy currents in the layers surrounding the cores (like, for example, the metal screen and the wires of the armour) and magnetic hysteresis of the ferromagnetic wires of the armour
Implementation Method 3
When alternate current (AC) is transported into a cable, the temperature of the electric conductors within the cable cores rises due to resistive losses, a phenomenon referred to as Joule effect
Data Source
AI summary
Armoured cable (10) comprising: —a plurality of cores (12) stranded together according to a core stranding direction; —an armour (16) surrounding the plurality of cores (12) and comprising a layer of metal wires (16a) helically wound around the cores (12) according to an armour winding direction; wherein the at least one of core stranding direction (21) and the armour winding direction (22) is recurrently reversed along the cable length L so that the armoured cable (10) comprises unilay sections (102) along the cable length where the core stranding direction (21) and the armour winding direction (22) are the same. The invention also relates to a method for improving the performances of the armoured cable (10) and to a method for manufacturing the armoured cable (10).