Busbar Connecting Device With Variable Work Hole Diameter
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Solution Overview
Problem
The existing busbar connecting devices face challenges in achieving stable insertion of insulating plugs without excessive surface pressure, which can lead to air voids and electrical discharges due to uneven surface pressure distribution between the plug and the work hole, affecting reliability and workability.
Innovation Solution
The busbar connecting device features a work hole with a larger diameter at the shallow part and a smaller diameter at the deep part, along with a protrusion, to create a controlled surface pressure distribution that prevents air voids and ensures reliable insertion of the insulating plug.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the diameter of the insulating plug is made larger than the work hole to ensure stable insertion, then the insertion stability is improved, but the surface pressure becomes excessively great making insertion impossible
Solution Approach 1:
The work hole is designed with non-uniform diameter along its length, being larger at the shallow part and smaller at the deep part. This local variation in geometry allows the insulating plug to be inserted easily at the shallow end while maintaining stable contact at the deep end, resolving the contradiction between insertion ease and stability.
2Ease of operation
If the surface pressure between the insulating plug and work hole is reduced to ease insertion, then the insertion ease is improved, but air voids form between the plug and work hole causing discharge
Solution Approach 1:
The work hole has different diameters at different depths, creating localized pressure distribution. The shallow part has larger diameter for easy insertion, while the deep part has smaller diameter to prevent air void formation near the busbar, thus maintaining insulation reliability without excessive insertion force.
Solution Approach 2:
Instead of uniform pressure distribution along the entire interface, the design creates a gradient pressure distribution by varying the work hole diameter in the depth dimension. This dimensional variation allows simultaneous achievement of easy insertion and void prevention.
Data Source
AI summary
Provided is a busbar connecting device that can achieve good workability and high reliability at the same time. The busbar connecting device includes: a connection portion in which a busbar conductor and a current conductor of a bushing are connected; an insulation busbar connector covering the connection portion; a work hole communicating with the connection portion from an outside of the insulation busbar connector; and an insulating plug inserted into the work hole and sealing the insulation busbar connector, wherein a surface pressure between an inner circumferential surface of the work hole and an outer circumferential surface of the insulating plug is greater at a deep part of the work hole than at a shallow part of the work hole.