Modular Cable Retaining Assembly for HV Thermal Expansion
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Solution Overview
Problem
Existing cable cleat systems for high-voltage cables face challenges such as increased electromechanical forces during short circuits, reduced thermal dissipation, strain due to expansion and contraction, and difficulty in installation and safety due to the weight and semi-conductive outer layers of the cables.
Innovation Solution
A cable retaining apparatus with a modular design featuring interlocking portions that allow for secure cable positioning and movement, incorporating insulating elements to prevent electrical conduction and a support system that accommodates thermal expansion, enabling easier installation and enhanced safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If cables are held tightly together by cable cleats, then cable positioning stability is improved, but electromechanical forces during short circuits increase and thermal dissipation decreases
Solution Approach 1:
The cable retaining apparatus is divided into multiple separate retaining portions, each holding individual cables at spaced intervals. This segmentation allows cables to maintain stable positioning while being separated enough to reduce electromechanical forces during short circuits and improve thermal dissipation through increased air circulation between cables.
2Stability of the object's composition
If cables are fixed in position at multiple locations, then cable stability is improved, but strain forces increase due to thermal expansion and contraction
Solution Approach 1:
The cable retaining apparatus employs movable retaining portions that can slide along the cable length to accommodate thermal expansion and contraction. This dynamic design allows cables to expand and contract freely without generating excessive strain forces on the fixing points, while still maintaining stable positioning during normal operation.
3Manufacturing precision
If heavy high-voltage cables are installed manually, then installation precision can be achieved, but installation time and safety risks increase
Solution Approach 1:
The apparatus is designed as modular segments that can be assembled in place, allowing installers to work with smaller, more manageable components rather than handling entire heavy cable assemblies. This modular approach maintains installation precision while reducing the time and physical effort required.
Solution Approach 2:
The patent describes lifting and positioning aids that act as intermediaries to assist in installing heavy cables. These tools provide mechanical advantage and precise positioning capability, enabling installers to handle heavy high-voltage cables safely and efficiently without compromising installation precision.
4Area of stationary object
If cables are arranged in tight trefoil configuration, then space utilization is improved, but correction of orientation errors becomes difficult
Solution Approach 1:
The retaining portions are designed with adjustable and movable features that allow cables to be repositioned and reoriented during installation. This dynamic capability enables installers to correct orientation errors easily while maintaining the compact trefoil configuration, balancing space utilization with ease of adjustment.
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 apparatus securely retains cables, reduces the risk of short circuits, improves thermal dissipation, and simplifies installation while ensuring safety by preventing electrical conduction and accommodating thermal expansion, thus enhancing the reliability and efficiency of high-voltage cable management.
Implementation Method 1
the insulating layer is damaged, such as during the installation procedure, a 'flash-over' event may occur
Implementation Method 2
This sheath provides a flow path to earth for charge that builds up on the outer surface of the insulating layer
Implementation Method 3
reduced dissipation of the thermal energy generated in the cables through Joule heating during current transport
Implementation Method 4
As electrical cables heat up and cool down, they expand and contract
Data Source
AI summary
A cable retaining apparatus includes a body defining at least one aperture for receiving a respective cable, a first insulator device arranged in the, or each, aperture for preventing electrical conduction from a cable to a surface of the body facing the cable, and a second insulator device for preventing electrical conduction from a cable to a surface of the body facing away from the cable.