High Voltage Bushing Field Gradient Arrangement
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Solution Overview
Problem
High voltage bushings require large condenser cores to achieve efficient smoothening of electrical potential distribution between conductors and grounded planes, leading to increased size, weight, and manufacturing complexity, as well as mechanical stress on the grounded plane.
Innovation Solution
A high voltage device comprising a hollow insulator with a conductor and a field gradient decreasing arrangement that includes a condenser core and a voltage grading shield, where the voltage grading shield is arranged around at least part of the condenser core, allowing for a smaller condenser core size while maintaining effective voltage grading, and contributing to the grading of voltage towards ground.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large condenser core is used to achieve efficient smoothening of electrical potential distribution, then the voltage grading effect is improved, but the size, weight, and manufacturing complexity increase
Solution Approach 1:
The field gradient decreasing arrangement is segmented into two functional parts: a condenser core for smoothening electrical potential distribution and a voltage grading shield for voltage grading towards ground. This segmentation allows each component to be optimized for its specific function, enabling a smaller condenser core while maintaining overall effectiveness.
Solution Approach 2:
A voltage grading shield is introduced as an intermediary component between the condenser core and the grounded plane. This shield assumes part of the voltage grading function, allowing the condenser core to be smaller while still achieving the required voltage distribution control.
2Reliability
If a large condenser core is used to achieve efficient smoothening of electrical potential distribution, then the voltage grading effect is improved, but the manufacturing complexity increases
Solution Approach 1:
By dividing the field gradient decreasing arrangement into a condenser core and a voltage grading shield, each component can be manufactured separately with optimized dimensions and structures, reducing the overall manufacturing complexity compared to a single large condenser core.
Solution Approach 2:
The voltage grading shield serves multiple functions: it provides voltage grading towards ground, supports the condenser core structure, and contributes to the overall mechanical stability of the bushing. This multi-functionality reduces the need for additional specialized components.
3Reliability
If a large condenser core is used to achieve efficient smoothening of electrical potential distribution, then the voltage grading effect is improved, but mechanical stress on the grounded plane increases
Solution Approach 1:
The mechanical load is segmented and distributed: the voltage grading shield bears part of the mechanical stress on the grounded plane, while the condenser core provides electrical insulation and potential distribution. This distribution reduces the mechanical burden on any single component and the grounded plane.
4Weight of stationary object
If the condenser core size is reduced, then the weight and manufacturing complexity decrease, but the voltage grading effect may be compromised
Solution Approach 1:
The functions of the condenser core and voltage grading shield are merged into a single integrated field gradient decreasing arrangement. The voltage grading shield extends beyond the condenser core in the axial direction, creating a combined structure where both components work together to achieve voltage grading, allowing a smaller condenser core while maintaining the required voltage grading effect.
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 combination of a condenser core and a voltage grading shield reduces the size and weight of the condenser core, simplifies manufacturing, and provides efficient mechanical support, while also improving thermal cooling and reducing electrical stress on the conductor, allowing for a smaller diameter conductor and easier handling.
Implementation Method 1
In order to obtain a smoothening of the electrical potential distribution between the conductor and the grounded plane, a bushing often comprises a condenser core
Implementation Method 2
A condenser core is a body which typically comprises a number of floating, coaxial foils made of a conducting material, where the foils are separated by a dielectric spacing material
Data Source
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AI summary
The present invention relates to a high voltage device for providing electrical insulation of a conductor extending through the device. The device comprises a hollow insulator; a conductor extending through the hollow insulator; a field gradient decreasing arrangement comprising a condenser core and a voltage grading shield. The condenser core and the voltage grading shield are arranged around the conductor inside the hollow insulator in a manner so that the voltage grading shield is arranged around at least part of the condenser core.