Bus-bar Device with Annular Cavity for Dielectric Insulation
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Solution Overview
Problem
Bar-passing devices for electrical equipment face challenges in meeting requirements for mechanical rigidity, electrical insulation, and fire resistance, as existing solutions are insufficient in these aspects.
Innovation Solution
A bar-passing device with a cover featuring an annular cavity filled with dielectric fluid, secured by ribs between the inner and outer walls, and a passageway connecting the internal volume to the annular cavity, ensuring mechanical strength and electrical insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional materials are used for bar-passing devices, then ease of manufacture is improved, but mechanical rigidity and electrical insulation capacity are insufficient
Solution Approach 1:
The patent employs a composite structure combining a thermoplastic body with a reinforcement element made of rigid material (metal or rigid plastic). This composite approach allows the use of conventional, easy-to-manufacture thermoplastic materials while achieving the required mechanical rigidity and electrical insulation through the combined properties of the two materials.
Solution Approach 2:
The bar-passing device is divided into distinct functional components: a thermoplastic body providing electrical insulation and ease of manufacture, and a separate reinforcement element providing mechanical rigidity. This segmentation allows each component to be optimized for its specific function while using appropriate materials.
2Reliability
If material selection is constrained to meet mechanical strength requirements, then mechanical rigidity is improved, but other constraints such as fire resistance and electrical insulation may be compromised
Solution Approach 1:
The composite structure allows the thermoplastic body to provide fire resistance and electrical insulation properties, while the rigid reinforcement element provides mechanical strength. This resolves the contradiction by distributing different functional requirements to different materials in the composite structure.
3Reliability
If the wall thickness is increased to improve electrical insulation, then electrical insulation capacity is improved, but mechanical rigidity and device compactness deteriorate
Solution Approach 1:
The device separates the electrical insulation function (performed by the thermoplastic body with its insulating properties) from the mechanical support function (performed by the rigid reinforcement element). This allows adequate electrical insulation without requiring excessive overall wall thickness, maintaining device compactness.
4Reliability
If a complex structure is designed to meet all regulatory requirements, then reliability is improved, but device complexity increases
Solution Approach 1:
The composite structure provides a straightforward design that meets multiple regulatory requirements (mechanical strength, electrical insulation, fire resistance) through the inherent properties of the two materials combined, rather than requiring complex geometries or multiple components.
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 provides enhanced mechanical rigidity and electrical insulation, allowing the device to meet regulatory requirements while using conventional materials, ensuring reliable operation and safety in electrical equipment.
Implementation Method 1
the annular cavity is filled with dielectric fluid
Implementation Method 2
a plurality of ribs securing the inner and outer walls to one another
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The busbar feeder device is intended to be mounted through an opening (O) provided in a wall (P) of an electrical device (3) filled with a dielectric fluid. The busbar feeder device (10) comprises: - a body (14); - a cover (16) having a housing (22) into which the body (14) is engaged. The cover (16) comprises an outer wall (80) defining an external surface of the cover (16) and an inner wall (82) delimiting the housing (22), the inner and outer walls (82, 80) delimiting between them an annular cavity (84) surrounding the housing (22), the cover (16) further comprising a plurality of ribs connecting the inner and outer walls (82, 80) to each other and extending into the annular cavity (84), the bar-pass device (10) having at least one passage (92, 94) connecting the internal volume (5) with the annular cavity (84) such that the annular cavity (84) is filled with dielectric fluid.