HV Bushing Conductor Support Body Deflection
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Solution Overview
Problem
Long gas insulated high voltage bushings experience significant static deflection due to conductor gravity and mass, which complicates electrical field control and can lead to flashovers, especially in very long bushings, making existing solutions like shifting fixation points impractical for high voltage and power distribution applications.
Innovation Solution
A high voltage bushing design featuring a tubular shell with end flanges and a support body that reduces conductor deflection by providing additional support points within the bushing, allowing for simpler and lighter fixation arrangements while maintaining mechanical stability and electrical insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the conductor is made longer to handle higher voltages and power distributions, then the bushing length increases to 10-20 m or even longer, but the static deflection of the conductor increases significantly making existing solutions impractical
Solution Approach 1:
The invention divides the single long unsupported conductor span into multiple shorter segments by introducing intermediate support bodies at specific locations along the bushing length. This segmentation reduces the effective span length of each conductor segment, thereby reducing static deflection without requiring excessive conductor tension or complex fixation point arrangements.
2Stability of the object's composition
If the fixation point is shifted horizontally up from the radial center to reduce deflection, then the deflection at the longitudinal center point is reduced, but the shift becomes too large to be practical for very long bushings
Solution Approach 1:
The invention introduces intermediate support bodies as mediator elements between the fixation points and the conductor. These support bodies provide additional support points that reduce conductor deflection without requiring large horizontal shifts of the fixation points from the radial center, thus avoiding excessive complexity in the fixation arrangement.
3Stability of the object's composition
If the conductor tension is increased to reduce static deflection, then the deflection is reduced to some extent, but the effect is limited and insufficient for very long bushings
Solution Approach 1:
By segmenting the long conductor span into shorter segments using intermediate support bodies, the invention reduces static deflection without requiring excessive conductor tension. Each segment experiences reduced gravitational load and bending moment, allowing the conductor to maintain adequate tension levels without over-stressing the fixation points or conductor material.
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
The solution effectively minimizes static deflection at the longitudinal center of the bushing, enabling more practical and efficient handling of high voltages and long lengths without compromising electrical field control or increasing the weight of the fixation point, and allows for better gas circulation and cooling.
Implementation Method 1
The static deflection of the conductor is generated by gravity and mass of the conductor itself
Implementation Method 2
allows for better gas circulation and cooling
Data Source
AI summary
A high voltage gas isolated bushing including a tubular shell with an end flange at each end of the shell creating an enclosed volume, a conductor suspended in the enclosed volume, having two ends, one end fixed to one end flange at a first fixation point and the other end fixed to the other end flange at a second fixation point. At least one of the end flanges is provided with a support body extending into the enclosed volume in the longitudinal direction of the bushing, and the body is arranged to support the conductor on at least one support point at a distance from the fixation point on the flange.