Noncontact Current Measurement in Parallel Superconductive Wires
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Solution Overview
Problem
The uneven distribution of currents through superconductive wires connected in parallel leads to reduced conductive current and increased AC loss in large-capacity power equipment, necessitating a method to ensure uniform current distribution.
Innovation Solution
A noncontact measurement method using Hall sensors to measure voltage levels based on magnetic fields, establishing a matrix relation between voltage and current levels, and calculating current values through a variable matrix to determine uniform current distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple superconductive wires are connected in parallel to achieve large-capacity power equipment, then the current capacity is increased, but the current distribution becomes uneven due to different impedances of each wire
Solution Approach 1:
The patent applies preliminary action by measuring the current distribution in each superconductive wire before the power equipment is put into operation. The Hall sensors are positioned to measure magnetic fields generated by currents in parallel wires, and the system calculates current distribution in advance to identify uneven distributions, allowing for preventive adjustments before actual operation begins.
2Measurement precision
If Hall sensors are arranged to measure current levels in parallel superconductive wires, then current distribution can be determined, but the device complexity increases due to multiple sensors and matrix calculations
Solution Approach 1:
The patent uses Hall sensors as intermediaries to non-contact measure current levels. The Hall sensors detect magnetic fields generated by currents in superconductive wires without direct electrical contact, converting magnetic field strength into voltage signals that can be processed to determine current distribution. This intermediary approach enables precise measurement while avoiding direct interference with the superconductive wires.
3Device complexity
If unbalanced current distribution is allowed in parallel wires, then the device complexity is reduced, but the conductive current is reduced and AC loss increases
Solution Approach 1:
The patent implements feedback by continuously measuring current distribution in parallel superconductive wires using Hall sensors and comparing the measured values against target uniform distribution. The system calculates current levels for each wire based on magnetic field measurements and provides feedback information that can be used to adjust current distribution, thereby reducing AC loss while maintaining manageable system complexity through automated measurement and analysis.
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 the determination of uniform current distribution in superconductive wires, thereby enhancing conductive current and reducing AC loss in parallel wire configurations.
Implementation Method 1
arranging a plurality of hall sensors for measuring voltage levels based on magnetic fields generated around the plurality of superconductive wires
Implementation Method 2
arranging a plurality of hall sensors for measuring voltage levels based on magnetic fields generated around the plurality of superconductive wires
Data Source
AI summary
A noncontact method for measuring currents flowing through superconductive wires connected in parallel is provided. The method includes arranging hall sensors for measuring voltage levels based on magnetic fields generated around the superconductive wires, setting a matrix relation between the measured voltage values, values of currents flowing through the superconductive wires, and a variable matrix having variables defining relations between the voltage values and the current values, applying predetermined current levels to the superconductive wires a number of times and measuring voltage values through the hall sensors, substituting the predetermined current values and the measured voltage values into the matrix relation to calculate the variables of the variable matrix, and substituting the calculated variable matrix and unknown voltage values, measured by the hall sensors when unknown currents flow through the superconductive wires, into the matrix relation to calculate values of the unknown currents flowing through the superconductive wires.