Adjustable Cable Restraint Insulator with HDPE Clamp
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing cable restraint insulators for power distribution equipment require multiple discrete sizes to accommodate various cable diameters and have limitations in terms of weight, cost, and durability due to the use of metal and/or porcelain components.
Innovation Solution
A cable restraint insulator with a clamp portion made of injection molded high-density polyethylene (HDPE) featuring thread-less locking bolts and pins, allowing incremental adjustment for different cable diameters and numbers, and incorporating slots for material savings and hanger bracket mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple discrete sizes of clamp portions are used to accommodate various cable diameters, then cable size accommodation is improved, but device complexity increases
Solution Approach 1:
The clamp portion incorporates an adjustable mechanism with movable jaws that can be positioned at different spacing intervals to accommodate various cable diameters. This dynamic adjustment capability allows a single clamp design to replace multiple discrete sizes, resolving the contradiction between adaptability and device complexity
Solution Approach 2:
The clamp portion allows changing the spacing parameter between cable-contacting surfaces through adjustable positioning mechanisms. By enabling continuous or discrete adjustment of this key parameter, the clamp can accommodate different cable diameters without requiring multiple discrete clamp designs
2Strength
If metal and/or porcelain components are used for clamp portions, then structural strength is improved, but weight increases
Solution Approach 1:
The insulator combines polymer material for the clamp portion with metal or porcelain only where structurally necessary for mounting support. This composite material approach maintains required structural strength while significantly reducing overall weight compared to traditional all-metal or all-porcelain designs
Solution Approach 2:
Different materials are applied to different parts of the insulator based on local functional requirements: polymer for the clamp portion where electrical insulation and corrosion resistance are prioritized, and metal or porcelain for the mounting portion where structural strength is critical
3Reliability
If metal and/or porcelain components are used for clamp portions, then durability is improved, but cost increases
Solution Approach 1:
The hybrid construction using polymer for clamp portions and metal or porcelain only for mounting components reduces material costs while maintaining durability. Polymer materials are generally less expensive and easier to manufacture than metal or porcelain, and their use in the clamp portion provides sufficient durability for cable restraint applications
Solution Approach 2:
The polymer clamp portion can be designed as a replaceable, lower-cost component that protects the more expensive metal or porcelain mounting portion from wear and corrosion. This approach extends the service life of the expensive components while using economical materials for parts subject to wear
Data Source
AI summary
An improved pole mount cable restraint insulator is described featuring a pin and bolt locking mechanism that may be used to secure a medium voltage 5 kV to 35 kV electrical cable to the insulator and riser pole. The cable restraint insulator includes a seat to secure the cable. A further improvement over existing cable restraints is the polymer insulating materials used in the construction. Such materials are lighter in weight, electrically track resistant, lower in cost and non-breakable. The cable restraint insulator may be constructed by injection molding and/or casting with variety of electrically insulating polymers.