Dielectric Bushing Cover With Air Gap to Prevent Wildlife Arcing
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Solution Overview
Problem
Existing high voltage transformer bushing covers are prone to burning and melting when contacted by wildlife structures like bird's nests, which create a conductive path leading to voltage arcs or leakage currents.
Innovation Solution
A dielectric bushing cover with at least two layers separated by an air gap, comprising a resilient polymer inner connector cover and an outer barrier that snap together or have a flexible hinge, providing additional dielectric insulation and preventing direct contact with wildlife structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single-layer plastic cover is used over the metal connector, then the cover provides basic insulation and prevents direct contact, but the cover is vulnerable to burning and melting when contacted by conductive wildlife structures like bird's nests
Solution Approach 1:
The single-layer plastic cover is divided into two separate dielectric layers: an inner connector cover that fits over the metal connector and an outer barrier that surrounds the inner cover. These layers are separated by an air gap, creating a multi-layered protective structure that prevents direct conductive paths while maintaining insulation effectiveness.
Solution Approach 2:
An air gap is introduced as an intermediary layer between the inner dielectric cover and the outer dielectric barrier. This air gap acts as an additional insulating medium that interrupts potential conductive paths through moisture or wildlife contact, thereby preventing burning and melting while maintaining reliable insulation protection.
2Ease of operation
If the plastic cover is pushed down tightly over the metal connector to ensure contact, then the cover provides secure fitting, but the cover creates a direct conductive path that allows voltage arcs or leakage currents when contacted by wildlife structures
Solution Approach 1:
The cover structure is segmented into two separate dielectric layers with an air gap between them. The inner connector cover provides secure fitting over the metal connector, while the outer barrier provides additional protection. The segmentation ensures that even if one layer contacts wildlife structures, the air gap and second layer prevent conductive paths.
Solution Approach 2:
The air gap serves as an intermediary that prevents direct contact between the inner and outer dielectric layers. This intermediary space eliminates continuous conductive paths that would otherwise allow voltage arcs or leakage currents to flow through the cover when wildlife structures contact it.
3Device complexity
If a single dielectric layer is used between the metal connector and wildlife contact points, then the structure is simple, but the single layer is insufficient to prevent voltage arcs or leakage currents through the cover
Solution Approach 1:
The single dielectric layer is segmented into two separate layers: an inner connector cover and an outer barrier. Each layer provides independent insulation protection, and when combined with an air gap between them, they create a more reliable protective system that effectively prevents voltage arcs and leakage currents despite the increased structural complexity.
Solution Approach 2:
The protective cover system uses a composite structure combining two different dielectric materials (inner connector cover material and outer barrier material) separated by an air gap. This composite arrangement provides enhanced insulation properties and prevents conductive paths that a single homogeneous layer cannot prevent, thereby improving reliability against voltage arcs and leakage currents.
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 multi-layer dielectric bushing cover effectively prevents voltage arcs and leakage currents by maintaining an air gap and additional dielectric insulation, thereby protecting the cover from burning or melting due to wildlife contact.
Implementation Method 1
A dielectric (e.g., polymer) bushing cover for use with high voltage components is described that has at least two layers separated by an air gap
Implementation Method 2
The inner connector cover is formed of a resilient polymer
Data Source
AI summary
A dielectric bushing connector cover, for use with high voltage components, has a dielectric inner connector cover that securely fits over an energized metal connector of the bushing. The inner connector cover has an opening for receiving an energized wire. Over the inner connector cover is a dielectric outer barrier. The outer barrier is securely supported by the top skirts of the ceramic bushing. The bushing may be supported by a grounded housing of a transformer. Since the metal connector is surrounded by at least two dielectric layers and an air gap, there is no voltage arc or leakage current between a bird's nest contacting the outer barrier and the transformer housing. In another embodiment, the outer barrier may surround a conventional plastic bushing cover without directly contacting the conventional bushing cover.