Parallel Star-Delta Transformer Layout With Fewer Busbar Crossovers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Connecting transformers in parallel in power transmission networks results in a large footprint, increased material costs, and complex maintenance due to overlapping bus works and height separation requirements, especially in high voltage applications, while using non-identical transformers increases design and testing costs.
Innovation Solution
An electrical arrangement using two star-delta transformers with the same phase relationship between their primary and secondary winding sides, optimizing the connection to minimize crossovers and reduce the need for additional height and material, while maintaining the same phase relationship for AC input and output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two identical star-delta transformers are connected in parallel with conventional wiring arrangements, then the phase relationship is maintained and redundancy is provided, but the number of electrical crossovers increases requiring height separation and increasing footprint
Solution Approach 1:
The patent reconfigures the spatial arrangement of electrical connections by changing the dimensional layout of busbars and connection points. Instead of conventional wiring that requires vertical height separation, the invention arranges connections in a planar configuration where busbars are positioned at different horizontal locations, eliminating the need for height separation while maintaining electrical isolation through proper spatial positioning.
2Reliability
If two identical star-delta transformers are connected in parallel, then the same phase relationship is maintained, but overlapping bus works require complex insulation and height separation
Solution Approach 1:
The invention eliminates the need for complex insulation by transitioning from a vertical stacking arrangement to a horizontal planar arrangement. Busbars that would otherwise overlap in the vertical dimension are redistributed across different horizontal positions, allowing electrical connections to be made without requiring insulation between overlapping conductors.
Solution Approach 2:
The patent extracts the insulation requirement from the connection design by removing the need for vertical separation. Through clever routing of busbars and positioning of connection points, the design achieves electrical isolation through spatial separation in the horizontal plane rather than relying on insulation materials and vertical clearance.
3Area of stationary object
If non-identical transformers are used to reduce crossovers, then design footprint is reduced, but design and testing costs increase
Solution Approach 1:
The patent introduces asymmetry in the connection arrangement rather than in the transformer units themselves. While the transformers remain identical (maintaining manufacturing simplicity), the busbar routing and connection point positioning are arranged asymmetrically to minimize crossovers and eliminate the need for height separation, achieving compact footprint without increasing design complexity.
4Ease of operation
If conventional parallel connection arrangements are used, then transformers are easily connected, but additional height separation increases material costs
Solution Approach 1:
The invention reduces material costs by eliminating the need for vertical height separation structures. By redistributing electrical connections in the horizontal plane with optimized busbar routing and strategically positioned connection points, the design achieves the same electrical isolation function without requiring additional insulators, support structures, or vertical clearance space.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
There is provided an electrical arrangement (400) for a power transmission network, comprising first and second transformers (410, 420) of the star-delta type, each having respective primary (412, 422) and secondary (414, 424) winding sides. The primary winding side (412, 422) of each transformer (410, 420) comprises three AC electrical connections (Y1, Y2, Y3, Y1', Y2', Y3'). The secondary winding side (414, 424) of each transformer (410, 420) comprises three AC electrical connections (d1, d2, d3, d1', d2', d3'). The transformers (410, 420) are arranged such that AC electrical connections (Y3, d3) of the first transformer (410) that are spatially adjacent AC electrical connections (Y1', d1') of the second transformer (420) are connected together. Remaining AC electrical connections (Y1, Y2, Y2', Y3', d1, d2, d2', d3') are connected so as to allow the first transformer (410) and second transformer (420) to have the same phase relationship.