Mobile Transformer Bushing Terminal With Direct Cable Connection
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Solution Overview
Problem
Existing electrical devices for high-voltage networks, such as transformers and chokes, face challenges in being quickly, flexibly, and cost-effectively connected to high-voltage networks due to the complexity and rigidity of high-voltage bushings, which require significant space and inflexible positioning.
Innovation Solution
A compact electrical device design featuring a direct, low-inductance connection between the high-voltage bushing and the tank, utilizing a feedthrough insulator and a shielding electrode, eliminates the need for bulky bushings by integrating the high-voltage conductor directly into the device housing, allowing for flexible positioning and reduced assembly complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional high-voltage bushings are used for connection, then reliable high-voltage connection is achieved, but the device becomes bulky and installation becomes complex
Solution Approach 1:
The traditional integrated bushing structure is segmented into separate components: a connection element with connecting conductors and a housing element with insulating support. This segmentation allows for simplified assembly and reduced complexity while maintaining reliable high-voltage connection through dedicated connecting conductors that can be independently positioned and secured.
Solution Approach 2:
The connecting conductors are nested within the housing structure, with the connection element integrated into the overall device assembly. The insulating housing contains and protects the conducting elements, creating a compact nested arrangement that reduces overall device bulk while maintaining functional integrity.
2Reliability
If traditional high-voltage bushings are used, then stable electrical connection is achieved, but the device requires significant space and flexible positioning becomes impossible
Solution Approach 1:
By separating the connection function into discrete connecting conductors that can be independently routed and positioned, the system gains flexibility in positioning while maintaining stable electrical connection. The conductors can be arranged to reach optimal connection points without being constrained by a fixed bushing structure.
Solution Approach 2:
The connection system transitions from a rigid, fixed-position bushing to a more dynamic configuration where connecting conductors can be positioned and routed flexibly within the housing structure, allowing adaptation to different installation locations and orientations while maintaining electrical stability.
3Reliability
If conventional bushing designs are used, then proper insulation is achieved, but assembly and mounting become time-consuming and costly
Solution Approach 1:
The insulation function is segmented into the housing element that provides structural insulation and the connecting conductors that are independently insulated. This allows for pre-assembled modular components that can be quickly installed without complex field assembly, improving productivity while maintaining proper insulation through dedicated insulating materials in the housing.
Solution Approach 2:
The housing element and connecting conductors can be pre-assembled and pre-insulated during manufacturing, allowing for rapid installation at the installation site. The insulating housing is prepared in advance with integrated mounting features, eliminating time-consuming on-site insulation work and accelerating the assembly process.
4Reliability
If large high-voltage bushings are used for higher voltages, then adequate clearance is achieved, but the combination of housing and bushing becomes bulky
Solution Approach 1:
Instead of increasing bushing size in all dimensions to achieve adequate clearance, the design utilizes three-dimensional space more efficiently by routing connecting conductors through optimized paths within the housing. The insulating housing is shaped to provide necessary clearance distances in critical areas while minimizing overall volume through strategic dimensional optimization.
Solution Approach 2:
The housing structure provides enhanced insulation and clearance only in the specific local areas where high voltage clearance is critical, rather than uniformly increasing the size of the entire bushing assembly. This localized approach to clearance provision reduces overall device volume while maintaining adequate arc prevention distances where needed.
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 design enables faster, more cost-effective, and flexible connection of electrical devices to high-voltage networks, reducing space requirements and simplifying assembly by eliminating the need for bulky bushings and allowing for easier movement and installation.
Implementation Method 1
a bushing insulator (17), which is made of an electrically non-conductive material
Implementation Method 2
The connecting conductor extends within a shielding electrode. The surrounding, closed shielding electrode encloses the connecting conductor in a ring, ring, or tube shape. The shielding electrode serves to reduce high electric field strengths
Data Source
Figure 1
Figure 2
AI summary
The aim of the invention is to create an electrical appliance (2) that can be connected to a high-voltage network in a flexible and cost-effective manner. To this end, a device (1) with a housing (12) filled with an insulating fluid is provided, a high-voltage bushing (16) comprising a high-voltage conductor (15) extending through a bushing insulator (17) being fixed to the housing (12). A cable connection (9) is also provided on the housing (12) in order to connect a high-voltage cable (8). In the housing (12), a jumper (14) surrounded by the insulating liquid produces a direct electrical connection between the cable connection (9) and the high-voltage conductor (15) of the high-voltage bushing (16). According to the invention, the high-voltage bushing is no longer placed in a boiler filled with oil, but is part of a mobile device connected to a winding in said boiler by means of a cable.