Current Transformer Flange Gluing for Gas Insulated Switchgear
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Solution Overview
Problem
Current transformer connections in high voltage gas insulated switchgear substations face challenges in mechanical stability and sealing protection due to the standard connection method using screws and peg-like flanges, which are risky for maintaining quality and integrity within SF6 insulation.
Innovation Solution
The flanges are glued into an insulating tubelike housing with peg-like portions that have a rough or micro-structured surface, ensuring a tight fit and enhanced mechanical grip, and a specialized glue is used for sealing, suitable for SF6 environments, with precise positioning and machining to ensure mechanical strength and insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If standard screw connection is used to connect flanges, then assembly is simple, but mechanical stability and sealing protection are insufficient
Solution Approach 1:
The patent combines mechanical interference fit and chemical adhesive bonding into a unified connection system. The peg-like portions provide mechanical interlocking through interference fit, while the glue provides chemical bonding and sealing, creating a composite connection that achieves both high strength and reliability without complex multi-component assemblies
Solution Approach 2:
The connection system uses composite bonding mechanisms combining mechanical (metal-to-plastic interference fit) and chemical (adhesive) bonding. This composite approach leverages the strengths of both methods: the mechanical interlock provides immediate structural strength while the adhesive provides continuous stress distribution and sealing
2Ease of manufacture
If peg-like flanges are used for connection, then assembly is easier, but sealing protection for SF6 is compromised
Solution Approach 1:
The glue acts as an intermediary substance between the metal flange and plastic housing, providing both sealing and bonding functions. This intermediary layer compensates for surface irregularities, ensures complete sealing of the SF6 environment, and distributes mechanical stresses uniformly across the connection interface
Solution Approach 2:
The connection design applies different properties to different parts: the peg-like portions provide mechanical interlocking at specific localized points, while the glue provides continuous sealing and bonding across the entire interface. The rough or micro-structured surface treatment is applied locally to enhance glue adhesion where needed
3Strength
If rough surface treatment is applied to peg-like portions, then glue grip is enhanced, but manufacturing complexity increases
Solution Approach 1:
The surface treatment (roughening or micro-structuring) is applied preliminarily to the peg-like portions before final assembly. This preliminary surface preparation creates optimal conditions for glue adhesion by increasing surface area and mechanical interlocking capability, ensuring strong bonding before the glue is applied and cured
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 method provides improved mechanical stability and sealing, resulting in a more reliable and durable current transformer connection that maintains the functionality of the gas insulated switchgear substation.
Implementation Method 1
the intersurface between both corresponding surfaces is provided with a glue, and that the outer surface of the the peg-like portions are provided with a rough or micro structured surface, by sandblasting or knurling, in order to result in a higher grip for the glue
Data Source
Figure 1
AI summary
The invention relates to a current transformer for high voltage gas insulated switchgear substation, wherein the the current transformer is arranged in a tubelike insulating housing, which is connected with a fastening flange at both ends of the tubelike housing, according to the preamble of claim 1. In order to enhance the connection of the aforesaid two flanges, in order result in high level mechanical stability and sealing, the invention is, that the aforesaid flanges are fixed to the insulating tubelike housing (1) by glueing in that way, that both flanges (2) are provided with a peg-like portion (2*), whose external diameter corresponds with the inner diameter of the insulating tubelike housing (1), in such, that the peg-like portion is pushed tightly into the insulating housing, and that the intersurface between both corresponding surfaces is provided with a glue.