High-Voltage Feedthrough Sliding Contact for Thermal Stress
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Solution Overview
Problem
High-voltage bushings with inhomogeneous field distribution due to production-related irregularities in the current conductors or winding supports, leading to reduced dielectric strength and unreliable electrical connections under thermal expansion and mechanical stress, causing the connecting device to fail.
Innovation Solution
A high-voltage bushing with a sliding contact system comprising a metal ring connected to the insulating body and a helical spring contact piece on the winding carrier, allowing for relative movement while maintaining a stable electrical connection through a retaining ring and insulating medium, preventing tensile forces on the connecting metal strip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a flexible metal strip is used as the connecting device, then the electrical connection can accommodate some relative movement, but the connection becomes unreliable under thermal expansion and mechanical stress due to tensile forces exceeding the material's yield point
Solution Approach 1:
The patent transforms the static metal strip connection into a dynamic system by introducing a sliding contact mechanism. The second contact piece is designed to slide along the winding carrier surface, allowing the connecting device to dynamically adapt to relative movements between the insulating body and winding carrier caused by thermal expansion and mechanical stress, preventing tensile forces from exceeding the metal strip's strength limits
Solution Approach 2:
The patent introduces a sliding contact mechanism as an intermediary between the first contact piece (fixed to insulating body) and the second contact piece (on winding carrier). This sliding contact acts as a mediator that absorbs relative movements through controlled sliding friction, protecting the metal strip from excessive tensile forces while maintaining continuous electrical connection
2Reliability
If the metal strip is firmly surrounded by insulating medium, then electrical insulation is improved, but the connecting device cannot accommodate relative movements between the insulating body and winding carrier
Solution Approach 1:
The patent segments the connecting device into three functional parts: the first contact piece fixed to the insulating body, the sliding contact mechanism, and the second contact piece on the winding carrier. This segmentation allows the insulating medium to firmly surround the metal strip for electrical insulation while the sliding contact segment provides movement accommodation capability through its ability to slide along the winding carrier surface
3Stability of the object's composition
If the connecting device is made rigid to prevent movement, then structural stability is improved, but the connection fails under thermal expansion and mechanical stress
Solution Approach 1:
The patent replaces the rigid connecting device with a dynamic system featuring a sliding contact mechanism. The second contact piece is designed to slide along the winding carrier surface, enabling the connecting device to maintain structural stability through controlled sliding motion while accommodating thermal expansion and mechanical stress, thereby preserving electrical connection continuity
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
Enhances the reliability of electrical connections by allowing for movement without overstressing the connecting device, ensuring continuous operation and preventing damage from mechanical and thermal stress.
Implementation Method 1
The sliding contact increases the reliability of the contacting because the flexibility of the connecting device is not limited by the maximum stretchability of the material of the connecting device
Implementation Method 2
The second contact piece can be arranged on the winding carrier axially at the level of the first contact piece and opposite this. The first contact piece makes contact with the second contact piece. The second contact piece is suitably arranged in such a way that it moves with the winding carrier when the winding carrier moves relative to the insulating body
Implementation Method 3
The insulating body comprises control inserts for the capacitive control of the high-voltage bushing, the control inserts being arranged coaxially with the winding carrier. Insulating layers are located between the control inserts
Data Source
AI summary
The invention relates to a high-voltage feedthrough 1 comprising an insulating body 4 that is arranged concentrically around a cylindrical winding support 2 consisting of electrically-conductive material, conductive control inlays 5, 51 which capacitively control said high-voltage feedthrough 1, are spaced apart from one another by means of insulation layers 6, and are arranged concentrically with said winding support, as well as a connection device 7 for establishing an electrical connection between a first control inlay 51 closest to the winding support, and said winding support 2. The invention is characterised in that the connection device contains an electrical sliding contact.