Modular Polymeric Insulator Non-Metallic Pin Design
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Solution Overview
Problem
Conventional overhead primary power distribution networks face issues with mechanical resistance, electric field concentration, ionization, leakage currents, fragility, corrosion, and high maintenance costs due to the use of metallic pins in insulators, which are not adequately addressed by existing non-metallic pin solutions or 'Post-type' insulators.
Innovation Solution
A modular polymeric insulator design featuring two insulating modules joined by a non-metallic pin, which is encased within the modules, providing enhanced mechanical and dielectric strength, and using a metallic pin or bolt for fastening, thereby eliminating the need for additional protective coverings and reducing manufacturing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metallic pins are used in conventional pin type insulators, then high mechanical resistance is achieved, but electric field concentration and ionization occur at the pin regions
Solution Approach 1:
The metallic pin is completely removed from the insulator structure. Instead, a non-metallic pin made of the same polymeric material is used to join insulator modules, eliminating the source of electric field concentration and ionization while maintaining mechanical strength through the modular design
Solution Approach 2:
The insulator is constructed as a composite structure with multiple polymeric insulator modules joined by a non-metallic pin. This composite approach allows the entire structure to be made from electrically inert polymeric materials, eliminating metallic components that cause electromagnetic interference
2Strength
If porcelain or glass insulators with metallic pins are used, then mechanical strength is achieved, but fragility to impact and corrosion occur
Solution Approach 1:
The material composition is changed from fragile porcelain or glass to flexible polymeric materials. The polymeric modules and non-metallic pin provide the same mechanical strength while being inherently resistant to impact and corrosion, eliminating the reliability issues associated with traditional materials
Solution Approach 2:
The polymeric insulator modules and non-metallic pin are designed to be replacement-friendly and modular. If damage occurs, individual modules can be replaced without replacing the entire insulator assembly, reducing maintenance costs and improving reliability over time
3Object-generated harmful factors
If non-metallic pins are used in insulators, then electric field concentration is reduced, but additional protective coverings are required for tracking and erosion resistance
Solution Approach 1:
The non-metallic pin is made from the same polymeric material as the insulator modules, creating a homogeneous structure. This eliminates the need for different protective coverings or coatings, as the polymeric material inherently provides tracking and erosion resistance throughout the entire pin structure
4Reliability
If post type insulators are used instead of pin type, then electrical performance is improved, but total insulator size is longer and manufacturing complexity increases
Solution Approach 1:
The insulator is divided into multiple modular polymeric segments that can be stacked together. Each module contains integrated shedding structures and connection points, allowing the insulator to achieve the necessary electrical performance through modular assembly rather than requiring a single long post-type structure
Data Source
AI summary
A modular polymeric insulator for overhead power distribution networks. The insulator includes a first insulating module adjacent to a supporting element; at least one further insulating module superimposed to the first insulating module and a non-metallic pin extending through the first insulating module and the at least one further insulating module. The modular polymeric insulator has a similar performance to a “Post type” insulator with the advantage of being resistant to impact and much lighter than a “Post type” insulator.