Pluggable High-Voltage Bushing with Integrated Capacitor Winding
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Solution Overview
Problem
Existing pluggable bushings for high-voltage systems face challenges in effectively controlling electric fields at high operating voltages, particularly in maintaining dielectric strength and simplifying manufacturing processes while ensuring a compact structure.
Innovation Solution
A pluggable bushing with a coaxial arrangement featuring a capacitor winding integrated into the insulator, which includes a mounting flange and tapered sections for precise electric field control, using hardened polymer and elastomer insulation to enhance dielectric strength and simplify manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a capacitor winding is integrated into the insulator, then electric field control precision is improved, but device complexity increases
Solution Approach 1:
The patent integrates the capacitor winding directly into the insulator body, combining two separate components (insulator and field control device) into a single integrated structure. This merging approach achieves precise electric field control while avoiding the complexity of assembling separate components, as the capacitor winding is embedded within the insulator material itself.
Solution Approach 2:
The insulator serves multiple functions: it provides electrical insulation, mechanical support, and houses the capacitor winding for electric field control. By making the insulator multi-functional, the patent eliminates the need for separate field control devices, thereby improving field control precision without increasing overall device complexity.
2Ease of manufacture
If the bushing structure is simplified and compacted, then ease of manufacture is improved, but electric field control capability deteriorates
Solution Approach 1:
By integrating the capacitor winding into the insulator, the patent reduces the number of separate components and assembly steps, simplifying manufacturing. The combined structure requires fewer joints and connections, making the bushing easier to manufacture while maintaining effective electric field control through the embedded winding.
Solution Approach 2:
The capacitor winding is strategically positioned within specific regions of the insulator to address local electric field distribution requirements. This localized placement allows the simplified compact structure to maintain precise field control capability in critical areas without requiring complex overall bushing design.
3Manufacturing precision
If capacitor coatings are wrapped with insulating foil at suitable positions, then electric field homogeneity is improved, but manufacturing complexity increases
Solution Approach 1:
The insulating foil is applied at specific strategic positions on the capacitor coatings rather than uniformly throughout. This localized insulation approach creates the necessary electric field homogeneity in critical regions while minimizing the overall complexity of the winding manufacturing process.
Solution Approach 2:
The insulating foil is pre-positioned and integrated into the capacitor winding structure during the manufacturing process, rather than being added as a separate post-processing step. This preliminary integration simplifies the overall manufacturing workflow while ensuring proper electric field homogeneity is achieved from the outset.
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 provides reliable and precise control of electric fields, maintaining dielectric strength and simplifying production, even at high voltages, by integrating a capacitor winding and elastomer insulation, ensuring effective field homogenization across the bushing's structure.
Implementation Method 1
The field control device is designed as a capacitor winding. The capacitor winding has capacitor coatings that are electrically isolated from one another
Implementation Method 2
capacitor coatings that are electrically isolated from one another, which are kept at a distance from one another in the radial direction by insulating film and are integrated into the insulator by embedding the capacitor winding in a hardened polymer compound
Implementation Method 3
The insulator has a tapered section which, after the bushing has been inserted into a plug-in part that closes off the component of the high-voltage system in an insulating-tight manner, dielectrically strengthens a joint that is arranged between an insulating sleeve of the plug-in part and the tapered section of the insulator
Data Source
Figure 1~2
Figure 3
AI summary
The pluggable high-voltage bushing (D) serves to connect a current conductor to an insulating-filled, metal-encapsulated component (T) of a high-voltage system. It is rotationally symmetrical about an axis (A) and comprises a centrally guided current conductor (10), a field control device, and an insulator (20) surrounding the current conductor with a tapered section (21). After the bushing (D) is inserted into a plug (60) that seals the component (T) with insulating material, a joint F) is dielectrically bonded between an insulating sleeve (64) of the plug (60) and the tapered insulator section (21). The bushing is designed to be characterized by a comparatively simple and robust construction and is also intended to effectively control the electric field during operation, even at very high operating voltages.This is achieved by the field control device being designed as a capacitor winding (40), by the capacitor winding (40) having electrically insulated capacitor pads (41) which are spaced apart from each other in the radial direction by insulating film (42) and are integrated into the insulator (20) by embedding the capacitor winding (40) in a hardened polymer mass (23), and by the capacitor pads (41) being guided through the mounting flange (30) into the tapered section (21) of the insulator (20).