Superconducting Cable Intermediate Connection Unit Magnetic Shielding
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Solution Overview
Problem
Existing intermediate connection units for superconducting cables are large due to the space required for liquid nitrogen cooling, leading to magnetic field leakage when current flows through the cables.
Innovation Solution
An intermediate connection unit with a reinforcement insulating layer having a large radius section and inclined surfaces, connected by tape-shaped superconducting wires that taper towards the electric insulating layer, and additional strip-shaped superconducting wires wound in the circumferential direction to enhance shielding and prevent magnetic field leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a shield connection body is provided to cover around the reinforcement insulating layer, then magnetic field leakage is prevented, but the intermediate connection unit becomes large due to the space required for liquid nitrogen cooling
Solution Approach 1:
The patent applies nesting by placing the reinforcement insulating layer inside the shield connection body structure. The insulating layer is positioned within the space defined by the shield connection body, allowing the magnetic shielding function to be achieved while minimizing the overall volume by efficiently utilizing the internal space for both insulation and shielding purposes.
Solution Approach 2:
The reinforcement insulating layer is provided with a non-uniform thickness configuration, being thicker at the inner peripheral side and thinner at the outer peripheral side. This local variation in thickness optimizes the insulation performance where it is most needed (near the superconductive conductor) while reducing material usage and overall size at locations where less insulation is required.
2Reliability
If the reinforcement insulating layer is made thicker to improve insulation, then insulation performance is improved, but the intermediate connection unit size increases
Solution Approach 1:
The reinforcement insulating layer is provided with a non-uniform thickness configuration, being thicker at the inner peripheral side and thinner at the outer peripheral side. This local variation in thickness optimizes the insulation performance where it is most needed (near the superconductive conductor) while reducing material usage and overall size at locations where less insulation is required.
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 configuration effectively prevents magnetic field leakage from the superconducting cables when a large current flows, ensuring efficient energy transmission without external magnetic field interference.
Implementation Method 1
By providing a shield connection body which covers around the reinforcement insulating layer and which connects with the shield layer, the magnetic field which occurs when a large amount of current flows in the superconductive conductor layer does not leak outside from the intermediate connection unit
Data Source
AI summary
In an intermediate connecting unit 50 of superconducting cables, by forming the connecting superconducting wires 101 in a trapezoid shape tapered in the direction of the electric insulating layer 113 (the superconducting shield layers 114) sides from the large radius section 213a side of the reinforcement insulating layer 213, the inclined surface sections 213b can be covered without spaces and without the plurality of connecting superconducting wires overlapping. The plurality of connecting superconducting wires 101 cover the inclined surface sections 213b of the reinforcement insulating layer 213 formed thicker than the radius of the cable cores 11 of the superconducting cables 10. The connecting superconducting wires 101 further connects the superconducting wires 10 arranged on the outer periphery of the large radius section 213a of the reinforcement insulating layer 213 and the superconducting wires 100 constituting the superconducting shield layers 114.