Continuously Transposed Conductors With Nested Insulated Sub-Conductors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional continuously transposed conductor (CTC) constructions are limited to 98 strands due to transposition equipment capabilities, leading to increased skin effect and eddy current losses, and circulating losses due to parallel bonded conductors.
Innovation Solution
Forming CTC strands from smaller CTCs, allowing for a higher number of conductors in the CTC cable by incorporating multiple transposed strands with various insulation materials and configurations, reducing skin effect and circulating current losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional CTC constructions with single conductors per strand are used, then the number of strands is limited to 98 due to transposition equipment capabilities, but skin effect and eddy current losses increase
Solution Approach 1:
The patent divides each strand into multiple parallel bonded conductors (sub-strands), allowing the overall CTC cable to accommodate more conductors beyond the 98-strand limitation. This segmentation enables increased conductor quantity while maintaining the transposition structure, thereby reducing skin effect and eddy current losses through better current distribution.
2Quantity of substance
If bonded conductors are used to increase the number of conductors, then the number of conductors increases, but circulating losses occur due to parallel bonded conductors
Solution Approach 1:
Each strand is segmented into multiple insulated sub-conductors that are bonded together. The insulation between sub-conductors prevents circulating currents while allowing the bundled structure to function as a single strand in the transposition system.
Solution Approach 2:
Insulation material acts as an intermediary between the parallel bonded conductors within each strand, electrically isolating them to prevent circulating currents while maintaining mechanical bonding and structural integrity of the strand.
3Quantity of substance
If the number of strands is increased beyond 98, then more conductors can be accommodated, but transposition equipment capabilities are exceeded
Solution Approach 1:
By segmenting strands into multiple sub-conductors, the patent effectively increases the conductor count without increasing the strand count beyond equipment capabilities. This allows conventional transposition equipment to handle the cable while achieving higher overall conductor capacity.
Solution Approach 2:
Multiple sub-conductors are nested within each strand structure, allowing the system to achieve higher conductor capacity within the constraints of the transposition equipment's strand handling capability.
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
Enables a higher number of conductors in CTC cables with reduced losses, improving performance in applications like transformers and rotating electric machines.
Implementation Method 1
leading to increased skin effect and eddy current losses
Implementation Method 2
leading to increased skin effect and eddy current losses
Data Source
AI summary
A continuously transposed conductor (CTC) cable may include a plurality of electrically insulated strands arranged in first and second stacks with the plurality of strands successively transposed between the first and second stacks. The plurality of strands may include at least one strand having a plurality of component strands that are arranged in third and fourth stacks with the plurality of component strands successively transposed between the third and fourth stacks. Each of the components strands may include a conductor and insulation formed at least partially around the conductor.