Multilayer Neutral Bus Structure for Generator Heat Loss Reduction
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Solution Overview
Problem
In large three-phase generators, heat losses in the neutral bus due to current flow are significant, affecting performance and lifespan, and existing methods like increasing the perimeter or using cooling methods either increase the footprint or have limitations in current carrying capacity.
Innovation Solution
A multilayer neutral bus arrangement with conducting layer elements and bushings, where each bushing is electrically connected to others, allowing current distribution between layers to reduce heat loss without increasing the footprint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the perimeter of the neutral bus is increased to reduce heat losses, then heat loss reduction is achieved, but the footprint of the neutral bus increases
Solution Approach 1:
The patent transitions from a single-layer neutral bus configuration to a multilayer configuration, utilizing the vertical dimension (z-axis) to create multiple conducting layers. This allows the current path to extend in three dimensions rather than being constrained to a single plane, effectively increasing the heat dissipation surface area without proportionally increasing the horizontal footprint. The multilayer structure enables heat loss reduction through increased perimeter while maintaining a compact overall footprint by stacking conducting layers vertically.
2Loss of energy
If the thickness of the busbar is increased to reduce heat losses, then heat loss reduction is achieved, but the current mainly flows at skin depth making thickness ineffective
Solution Approach 1:
The patent divides the neutral bus into multiple separate conducting layers (first conducting layer element, second conducting layer element, etc.) rather than using a single thick busbar. Each layer carries a portion of the total current, and the layers are electrically connected through bushings. This segmentation allows the current to distribute across multiple surfaces at the skin depth, effectively increasing the total current carrying capability and heat dissipation surface area without relying on increased thickness of a single element.
3Temperature
If air cooling is used to cool the neutral bus, then cooling is achieved, but the footprint increases or current carrying capability is limited to smaller machines
Solution Approach 1:
The multilayer neutral bus structure inherently provides improved heat dissipation through its increased surface area and distributed current paths, reducing the need for external active cooling systems. The configuration itself serves the cooling function by distributing current across multiple layers with greater surface exposure, allowing heat to dissipate more efficiently through radiation and convection from multiple surfaces, thereby reducing or eliminating the need for additional air cooling infrastructure that would increase footprint.
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 multilayer neutral bus effectively reduces heat losses by distributing current between conducting layers, improving performance and lifespan without the need for increased footprint or complexity.
Implementation Method 1
The skin depth is relational to the frequency of the current and not to the thickness or cross section of the substrate
Data Source
AI summary
A multiplayer neutral bus that includes a plurality of conductive layers and a plurality of bushings is provided. At least a portion of the conductive layers are spaced apart from each other and form separate electrical flow paths. The conductive layers and bushings are arranged so that each bushing is electrically coupled to each of the other bushings. A method of installing the neutral bus is provided.