Conical Insulator Connecting Device with Flexible Interface
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Solution Overview
Problem
Existing electrical apparatuses connecting high voltage devices with solid insulators face issues with partial discharge due to bubble formation and surface pressure degradation over time, leading to decreased insulation performance.
Innovation Solution
A connecting device is designed with projection and recess type conical insulators and a flexible insulator, where the electric field direction at the interfaces is aligned with the interface, reducing the electric field within bubbles and preventing partial discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness at the center side of the flexible insulator is made larger, then the surface pressure at the center side is increased, but the manufacturing complexity increases
Solution Approach 1:
The flexible insulator's thickness parameter is varied radially, being larger at the center side and smaller at the outer diameter side. This parameter change optimizes the surface pressure distribution to increase voltage withstanding performance while the conical configuration allows for relatively straightforward manufacturing using conventional molding techniques.
2Reliability
If a step portion is provided to make surface pressure uniform, then partial discharge is reduced, but the device complexity increases
Solution Approach 1:
Instead of adding a step portion to the solid insulator interface, the invention extracts the pressure distribution function to the flexible insulator itself by varying its thickness. This eliminates the need for complex stepped interfaces while achieving uniform surface pressure and reducing partial discharge.
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
This configuration inhibits partial discharge and maintains insulation performance by reducing the electric field within bubbles and ensuring consistent surface pressure, thereby preventing insulation degradation.
Implementation Method 1
an electric field direction at each interface formed on the projection type conical insulator and the recess type conical insulator is a direction along the interface
Implementation Method 2
the adhesion between the solid insulators is improved by inserting a flexible insulator such as silicone rubber into the contact interface, whereby voids or air gaps at the interface are eliminated
Data Source
AI summary
In a connecting device of an electrical apparatus in which a first solid insulator and a second solid insulator each molded as a solid insulator on a periphery of a center conductor are connected to each other via a flexible insulator, a high voltage electrode having an outer diameter larger than those of the center conductors is disposed in the second solid insulator, and a ground electrode having an inner diameter smaller than that of an outer ground layer of the second solid insulator and larger than the outer diameter of the high voltage electrode is disposed in the first solid insulator. Electric field directions at an interface between the first solid insulator and the flexible insulator and at an interface between the second solid insulator and the flexible insulator are directions along the respective interfaces.