Cable Sealing End Bushing Flange Annular Projection
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Solution Overview
Problem
Existing cable sealing ends with insulating tubes are bulky, complex, and have insufficient creepage distance, leading to increased costs and suboptimal electrical performance due to the arrangement of multiple components.
Innovation Solution
A cable sealing end design featuring an annular projection part at the bushing flange, which serves as an insulating tube, lengthening creepage distance and improving strength, and allowing the pressure unit to be internally arranged for compactification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insulating tube is arranged between the lower metal fitting and the cable protective metal fitting, then electrical insulation is achieved, but the cable sealing end becomes long and bulky
Solution Approach 1:
The patent merges the insulating tube function with the bushing flange by providing an annular projection part on the bushing flange that extends in the axial direction. This integrated structure combines the bushing and insulating tube functions into a single component, eliminating the need for separate insulating tubes and reducing overall length while maintaining electrical insulation between the lower metal fitting and cable protective metal fitting.
2Reliability
If multiple components (insulating tube, lower metal fitting, cable protective metal fitting) are arranged sequentially, then electrical insulation is ensured, but the number of components increases and cost increases
Solution Approach 1:
The patent combines multiple components into fewer integrated structures. The bushing flange with annular projection part integrates the bushing and insulating tube functions, while the integrated stress-relief cone structure combines insulation and stress relief functions, reducing the total number of components and simplifying assembly.
Solution Approach 2:
The annular projection part of the bushing flange serves multiple functions: it provides electrical insulation, maintains structural integrity, and enables stress relief. This multi-functional design eliminates the need for separate dedicated components for each function, reducing complexity while ensuring reliable electrical insulation.
3Length of stationary object
If the insulating tube is shortened to reduce overall length, then compactification is achieved, but the creepage distance becomes insufficient and electrical performance deteriorates
Solution Approach 1:
The patent extends the insulating structure in the radial direction through the annular projection part of the bushing flange, rather than only in the axial direction. This dimensional change provides sufficient creepage distance for electrical insulation while keeping the axial length compact, as the projection part creates an extended insulating path perpendicular to the main axial direction.
Data Source
Figure 1
Figure 2
Figure 3(a)~3(b)
AI summary
The improvement of the strength of the flange part (bushing flange part) of the bushing, the increase of the creepage distance of the insulating tube, and the compactification of the cable sealing end are attempted. The cable sealing end of this invention is provided with the bushing (2) which is attached to the opining part (11) of the equipment case (1) which houses the power equipment in the air tight, the cable termination (3) which is attached to the receiving port (25) of the bushing (2), and the pressure unit (5) which presses the stress-relief cone (4) which is attached to the cable termination (3) toward the bushing (2) side. The flange part (bushing flange part) (22) which projects toward the outer direction of the diameter direction is provided at the rear-end part side of the bushing (2), and the annular projection part (26) is provide concentrically to the flange part (22) at the rear-end surface side of the flange part (22), and the angular pressure metal fitting flange part (52) which composes the pressure unit (5) is arranged concentrically to the bushing (2) through the space (G) at the inner circumference side of the projection part (26).