Lateral Cable Clamp Layout for Long-Creepage Composite Insulators
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Solution Overview
Problem
Existing suspension cable clamps in eHighway catenary systems for electric trucks face challenges with creepage distance and mechanical vulnerability due to the use of cast resin insulators, which are inadequate for high voltages and prone to leakage currents, leading to increased complexity and material usage when upgraded to silicone composite insulators.
Innovation Solution
A suspension cable clamp design featuring a silicone composite insulator with a GRP rod, metal fittings, and a lateral fastening device that includes a pot with a receiving device and U-bolts, allowing for increased creepage distance without significantly altering the boom's geometry or mechanical load, and providing self-cleaning properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cast resin insulators are used in suspension cable clamps, then mechanical guidance and electrical insulation are provided, but the creepage distance is insufficient (< 100 mm) for high voltage applications requiring > 300 mm
Solution Approach 1:
The patent applies composite materials by combining a GRP (glass fiber reinforced plastic) rod with a silicone rubber coating to create a composite insulator. This composite structure provides both the mechanical strength of the GRP rod and the electrical insulation properties with sufficient creepage distance of the silicone rubber coating, achieving > 300 mm creepage distance while maintaining mechanical guidance functionality.
2Reliability
If silicone composite insulators are used to achieve required creepage distance of > 300 mm, then electrical insulation is improved, but the overall length of the suspension cable clamp increases significantly
Solution Approach 1:
The patent transitions from vertical attachment (from above) to lateral attachment (from the side) of the suspension cable clamp to the boom tube. This dimensional change in attachment orientation allows the insulator length to extend laterally rather than vertically, achieving the required > 300 mm creepage distance without significantly increasing the vertical height and bending moment on the boom structure.
3Reliability
If suspension cable clamps are arranged vertically on boom tubes with increased length for silicone composite insulators, then creepage distance is achieved, but the bending moment on the boom tube increases significantly
Solution Approach 1:
The patent changes the attachment orientation from vertical to lateral, repositioning the insulator along the horizontal axis rather than the vertical axis. This dimensional reconfiguration allows the increased insulator length to be accommodated in the lateral direction, preventing significant increases in vertical bending moment on the boom tube while still achieving the required creepage distance.
4Reliability
If insulators are cut into suspension cables to separate insulating function, then creepage distance can be achieved, but the assembly becomes technically complex requiring two insulators and current bridges
Solution Approach 1:
The patent merges the insulating function and the suspension cable clamp function into a single integrated component. The silicone composite insulator serves dual purposes: providing electrical insulation with sufficient creepage distance and serving as the suspension cable clamp itself. This eliminates the need for separate insulators and current bridges, significantly simplifying the assembly while achieving the required reliability.
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 ensures a longer creepage distance of over 300mm at 670 V while reducing mechanical loads and complexity, allowing for easier assembly and reduced material usage compared to previous designs, with improved self-cleaning and stability.
Implementation Method 1
the at least one insulator is designed as a silicone composite insulator
Implementation Method 2
the silicone composite insulator has self-cleaning properties
Data Source
Figure 1
Figure 2~3
AI summary
The invention relates to a cable clamp for connection with a cantilever tube of an overhead line system with at least one insulator and at least one fastening device for fastening the cable clamp to the cantilever tube, wherein the at least one fastening device is for laterally fastening the cable clamp to the cantilever tube and the at least one insulator is designed as a silicone composite insulator, and to an overhead line system with at least one such cable clamp.