Modular Plug and Socket Wall Bushing for HVDC Transport
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Solution Overview
Problem
High and Ultra High AC or DC voltage wall bushings are excessively long and heavy, posing challenges in transportation, assembly, and maintenance, with conventional insulation systems being difficult to construct and prone to damage during shipping, and existing pure gas technology solutions insufficient to address these issues.
Innovation Solution
The wall bushing is designed as a modular system comprising a plug module and a socket module, both based on pure gas technology, allowing for easier transportation and assembly by separating the structure into two manageable sections that can be connected and disconnected for inspection and replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional insulation systems (RIP or gas type) are used for high voltage wall bushings, then insulation performance is achieved, but the bushing becomes extremely long and heavy, making transportation and assembly prohibitively complex
Solution Approach 1:
The wall bushing is divided into multiple modular sections (first section with inner flange, second section with outer flange, and intermediate sections) that can be manufactured separately and assembled on-site. Each section contains its own insulation structure with conductor, insulating material, and flanges, allowing the overall bushing to be transported in manageable pieces rather than as one extremely long and heavy unit.
2Device complexity
If the bushing length is reduced to 20m or less, then transportation becomes feasible, but the insulation capability for voltages above 500kV DC or 400kV AC is insufficient
Solution Approach 1:
The bushing is segmented into multiple sections that can be connected in series to achieve the required total insulation capability for high voltages while keeping each individual section transportable. The modular design allows the insulation performance to be scaled by adding more sections rather than requiring one extremely long bushing.
Solution Approach 2:
Multiple modular sections are combined through flange connections to form a complete high-voltage bushing assembly. The sections are designed to be electrically and mechanically connected, merging their individual insulation capabilities to achieve the required performance for voltages above 500kV DC or 400kV AC.
3Weight of moving object
If pure gas technology is used to reduce mass, then weight is reduced, but the bushing remains too long for practical transportation and assembly
Solution Approach 1:
The pure gas technology bushing is divided into modular sections that can be transported separately. Each section maintains the lightweight pure gas insulation design while being compact enough for practical transportation, and the sections are assembled on-site to form the complete long-distance bushing structure.
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 modular design simplifies transportation and assembly, reduces the risk of damage, and allows for easier inspection and replacement of individual modules, significantly reducing costs and complexity, while maintaining effective insulation and electrical connectivity.
Implementation Method 1
The main insulation consists of compressed SF6 (sulphur hexafluoride) gas. The two purposes of the compressed SF6 gas are: to insulate the conductor from ground potential
Implementation Method 2
The two purposes of the compressed SF6 gas are: to insulate the conductor from ground potential and to improve the cooling of the central conductor
Data Source
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AI summary
The invention relates to the domains of power electronics and electric power transmission systems and concerns a new structure for wall bushings for High and Ultra High Voltage AC or DC applications. The wall bushing is remarkable as it can be assembled as a kit of two replaceable modules: a plug type module (20) and a socket type module (30) whose central conductors (15a,15b) are connected by a joint that allows their thermal expansion.