Bucking Bundle Low Voltage Cable for AC Loss Reduction
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Solution Overview
Problem
Conventional high temperature superconducting (HTS) power transmission cables face challenges in achieving high flexibility and low alternating current (AC) losses, particularly in applications requiring lower resistive, eddy current, and superconducting hysteresis losses.
Innovation Solution
The design incorporates a bucking bundle configuration with three insulated electrical conductors in each bundle, arranged to cancel out magnetic fields and currents within a plane transverse to the cable's electrical conduction direction, using a laminated superconductor wire assembly with high temperature superconductors and metal substrates, and a low-friction Teflon wrap to facilitate flexibility and reduce AC losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional HTS power transmission cables are used, then high current transmission over great distances is achieved, but flexibility and AC losses (resistive, eddy current, and superconducting hysteresis losses) are insufficient
Solution Approach 1:
The cable is divided into multiple bundles, each containing three insulated electrical conductors arranged in a specific configuration. This segmentation allows each bundle to independently manage magnetic field cancellation while maintaining overall cable flexibility through the modular bundle structure.
Solution Approach 2:
Within each bundle, the three electrical conductors are positioned asymmetrically in a triangular arrangement rather than symmetrically. This asymmetric positioning, combined with specific current phase relationships, enables effective magnetic field cancellation while preserving cable flexibility.
2Productivity
If conventional HTS cable configurations are used, then high current transmission is achieved, but extensive insulation and cryogenic cooling are required
Solution Approach 1:
The magnetic fields generated by the current-carrying conductors, which would normally cause energy losses and require extensive shielding, are instead utilized to cancel each other out through the specific three-conductor bundle configuration. The harmful magnetic fields are converted into a beneficial cancellation effect, reducing the need for extensive insulation and cooling infrastructure.
Solution Approach 2:
The invention changes the phase parameters of the currents in the three conductors by 120 degrees relative to each other, and adjusts the spatial positioning parameters of the conductors within the bundle. These parameter changes enable magnetic field cancellation while maintaining high current transmission capability with reduced cooling requirements.
3Ease of manufacture
If magnetic fields are not canceled within bundles, then simpler conductor arrangement is possible, but AC losses increase due to eddy currents and superconducting hysteresis
Solution Approach 1:
The three-conductor bundle configuration creates an equipotential magnetic environment by ensuring that the magnetic fields from each conductor cancel each other out, resulting in zero net magnetic field within the bundle. This equipotential magnetic state eliminates the driving force for eddy currents and hysteresis losses without requiring complex conductor arrangements.
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 configuration allows for a low bend radius and minimal AC losses, reducing the need for extensive insulation and cryogenic cooling, making the cable more practical for flexible installations and efficient operation at low voltages.
Implementation Method 1
the first electrical conductor, the second electrical conductor and the third electrical conductor are configured so that a net magnetic field generated in response to currents flowing within the bundle is zero within a plane oriented transverse to an electrical conduction direction of the cable
Implementation Method 2
at least one insert disposed between the first support lamina and the second support lamina, the at least one insert including a high temperature superconductor
Data Source
AI summary
A cable includes a plurality of bundles of insulated electrical conductors, each bundle having a first conductor, a second conductor, and a third conductor in a layered configuration. The first conductor of each bundle is connected in parallel to the first conductor of the remaining bundles, the second conductor of each bundle is connected in parallel to the second conductor of the remaining bundles, and the third conductor of each bundle is connected in parallel to the third electrical conductor of the remaining bundles. In addition, within each bundle, the first, second and third electrical conductors are configured so that a magnetic field generated in response to currents flowing within the bundle is zero as seen at a plane oriented transverse to an electrical conduction direction of the cable and located between the ends of the cable.