High-Voltage Bushing Insert Layout for Short-Cone Field Control
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Solution Overview
Problem
High-voltage bushings with short outer cones face challenges in achieving effective field control due to limited axial control paths, compromising reliability and compactness, especially in cable termination applications where the recess for the insulating body is also short.
Innovation Solution
The arrangement of control inserts, where the outermost control insert extends axially beyond the inner control insert, enables reverse control, providing a longer axial control path and forming an inner cone geometry that enhances field control, even with a short outer cone design, allowing for reliable and compact high-voltage device operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the outer cone of the insulating body is designed to be short in the axial direction to match a short recess in the cable connector, then the compactness of the high-voltage device is improved, but the axial control path for effective field control becomes insufficient
Solution Approach 1:
The patent inverts the conventional control insert arrangement by having the outermost control insert extend axially beyond the inner control inserts, creating a reverse control configuration. This inversion allows the control path to extend axially beyond the shortened outer cone end, achieving sufficient field control effectiveness while maintaining a compact overall device length.
Solution Approach 2:
The patent transitions from a conventional control insert arrangement where all inserts are contained within the outer cone to a configuration where the control path extends in the axial dimension beyond the outer cone end. This dimensional extension resolves the contradiction by providing sufficient control path length without increasing the main body length of the device.
2Volume of moving object
If the outer cone is shortened to achieve compact dimensions, then the overall device size is reduced, but the ability to perform fine field control within the outer cone is compromised
Solution Approach 1:
By inverting the control insert arrangement so that the outermost insert extends beyond the inner inserts axially, the patent enables fine field control to be achieved within a shortened outer cone. The reverse control configuration allows precise field management despite the reduced axial length of the outer cone.
3Reliability
If the axial control path is extended to improve field control, then the reliability of the high-voltage device is improved, but the compactness and overall dimensions of the device increase
Solution Approach 1:
The patent merges the control path extension with the existing outer cone structure by having the outermost control insert extend axially beyond the other inserts while remaining integrated with the insulating body. This combining approach achieves extended control path length without adding separate components or significantly increasing overall device volume.
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 ensures uniform and low load on insulating media while maintaining compact dimensions, achieving high reliability and fine field control, particularly in cable termination applications, by extending the axial control path and optimizing field control geometry.
Implementation Method 1
conductive control inserts arranged essentially concentrically around the inner conductor and suitably spaced apart from one another by insulating layers for (capacitive) field control
Data Source
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AI summary
The invention relates to a high-voltage device (10) comprising an insulating body (12), an inner conductor (13) which passes through the insulating body along a longitudinal direction of the device, the insulating body having a frustoconical first axial end (15), and the insulating body further comprising conductive control inserts (17, 18) for field control, arranged substantially concentrically around the inner conductor and suitably spaced apart from one another by insulating layers. The invention is characterized in that a radially outer, suitably outermost, control insert (17) extends axially beyond the end of at least one inner control insert (18), which is located closer to the inner conductor with respect to the outer control insert, in the direction of the first end of the insulating body.