Oil-Oil Feedthrough with Shielding Elements
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Solution Overview
Problem
Existing oil-oil feedthroughs require cumbersome assembly and additional insulation barriers to prevent electrical breakdown, which are costly and prone to moisture absorption, especially in high-voltage applications.
Innovation Solution
A dome-like shielding element made of conductive material is integrated on both ends of the bushing channel, providing axial overlap and reducing field strength without the need for additional barriers or insulation, using a rotationally symmetrical, paraboloid-like hollow feedthrough element with a conically tapering channel and a conductive feedthrough conductor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional barriers and paper insulation are used in conventional oil-oil feedthroughs, then electrical breakdown is prevented, but assembly becomes cumbersome and production costs increase
Solution Approach 1:
The invention extracts and eliminates the additional barriers and paper insulation from the feedthrough structure. By using a through-conductor that extends directly through the insulating element, the design removes the need for separate insulation barriers, simplifying assembly while maintaining electrical breakdown prevention through the inherent insulation properties of the solid insulating material.
Solution Approach 2:
The invention merges the electrical conductor with the insulating element by having the conductor pass directly through the insulating material. This integration eliminates the need for separate barrier components and paper insulation layers, combining the structural and electrical functions into a single unified assembly that reduces complexity.
2Reliability
If additional barriers and pressboard insulation are used, then electrical insulation is improved, but moisture absorption risk increases
Solution Approach 1:
The invention extracts and removes the pressboard and paper insulation components that are prone to moisture absorption. By relying on the solid insulating material's inherent properties and the through-conductor design, the solution eliminates moisture-sensitive materials while maintaining adequate electrical insulation.
3Reliability
If conventional bushing designs are used, then insulation distances are maintained, but production costs increase due to additional insulation materials
Solution Approach 1:
The invention merges the insulation function with the structural insulating element itself, eliminating the need for separate paper insulation and pressboard components. This integration reduces material costs and simplifies manufacturing while maintaining the necessary insulation distances through the inherent properties of the solid insulating material.
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 enables easy installation and robust, compact oil-oil feedthroughs that reduce field strength and eliminate the need for additional insulation, enhancing handling and reducing production costs by avoiding moisture-sensitive materials.
Implementation Method 1
dome-like shielding elements made of conductive material are integrated on both ends of the bushing channel, providing axial overlap and reducing field strength
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to an oil-oil feedthrough (70) comprising a rotationally symmetrical (14), paraboloid-like, hollow feedthrough element (12, 72) made of a solid insulating material, along the axial extent of which a tube-like feedthrough channel (16) is formed radially inside, the wall thickness of which is conically tapered towards at least one of its two ends, and an electrical feedthrough conductor (18, 76) fitted into the feedthrough channel (16) and projecting from it on both sides.At at least one of the two axial ends of the feedthrough channel (16), a respective hollow cylindrical shielding element (30, 52, 80, 82) made of a conductive material with at least partial thick walls (44) is arranged, which on one side encloses the respective end of the feedthrough channel (16) and the feedthrough conductor (18, 76) projecting from it, and which on its respective other side is provided for receiving and electrically contacting a respective connecting conductor (74, 78), wherein the axial ends of the shielding element (30, 52, 80, 82) are rounded. The invention also relates to an oil transformer with an oil-to-oil feedthrough (70) according to the invention.