High-Voltage Bushing Retaining Ring Axial Force Interlock
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Solution Overview
Problem
High-voltage bushings face mechanical stress issues due to axial forces during service, leading to potential slippage and dislodgment of the insulation member from the fixing flange, especially under high forces like 100 kN, compromising reliability and electrical integrity.
Innovation Solution
Incorporating a retaining ring with a detachable screw connection and an outer projection on the insulation member that interlocks with an inner projection of the retaining ring, along with an O-ring seal and a conically tapering counter-projection, to counteract axial forces and enhance frictional engagement, while using resin-impregnated insulation plies and field control inlays for improved mechanical and electrical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the insulation member is fixed to the fixing flange using only frictional engagement, then the structure remains simple and easy to manufacture, but the insulation member may slip or dislodge under high axial forces up to 100 kN
Solution Approach 1:
The retaining ring is designed as a multi-part (two-part) structure that can be assembled from separate components rather than being a single integrated piece. This segmentation allows the retaining ring to be mounted more easily while still providing the necessary mechanical interlocking engagement to prevent slippage under high axial forces
Solution Approach 2:
The solution transitions from relying solely on axial frictional engagement to incorporating radial interlocking engagement through projections. The outer projection on the insulation member engages with the inner projection of the retaining ring, creating a mechanical lock in the radial dimension that effectively prevents axial displacement under high forces
2Stability of the object's composition
If a retaining ring with interlocking projections is added to prevent axial displacement, then mechanical stability improves, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The retaining ring is divided into multiple parts that can be assembled separately, making it easier to manufacture each component individually and then combine them, rather than requiring a complex monolithic structure
Solution Approach 2:
The O-ring seal acts as an intermediary element between the outer projection and inner projection, compensating for structural inaccuracies and facilitating easier assembly while maintaining the mechanical interlocking engagement
3Strength
If the interlocking engagement surface is inclined at less than 90 degrees, then force distribution improves and rupture initiation is prevented, but the manufacturing precision requirements increase
Solution Approach 1:
The O-ring seal is installed beforehand to compensate for potential structural inaccuracies in the inclined engagement surface, providing a cushioning effect that reduces the stringency of manufacturing precision requirements while maintaining effective force distribution
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 effectively minimizes the risk of insulation member displacement, enhances mechanical and electrical stability, and ensures reliable operation under high forces by distributing forces effectively and maintaining precise alignment for better dielectric properties.
Implementation Method 1
an O-ring seal, preferably made of a resilient material, is arranged between the outer projection and the inner projection. The O-ring seal serves to compensate for any structural inaccuracies of the two projections.
Implementation Method 2
High compressive and tensile forces can act on the high-voltage bushing when the high-voltage bushing is in service. These forces can in part be absorbed by a frictional engagement between the individual components of the high-voltage bushing
Data Source
AI summary
A high-voltage bushing includes an insulation member, an inner conductor that extends through the insulation member, and a fastening flange that is arranged externally on the insulation member. The high-voltage bushing additionally includes a retaining ring that is connected to the fastening flange, and the insulation member includes an outer projection that is arranged on the outer circumference and interlockingly cooperates with an inner projection on the retaining ring to counteract an axial force on the fastened high-voltage bushing.