Superconducting Magnet Polarity Detection for Quench Protection
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Solution Overview
Problem
The existing superconducting magnet devices face challenges with thermal runaway (quenching) of the superconducting coil, which can lead to damage due to incorrect polarity connection between the coil and the power supply, hindering the operation of the quenching protection circuit.
Innovation Solution
A superconducting magnet device is designed with a quenching protection circuit that allows current in one direction, an excitation power supply with proper polarity to ensure current flows correctly during quenching, and a configuration to detect incorrect polarity connections, preventing damage and ensuring proper operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a quenching protection circuit is provided to protect the superconducting coil, then the reliability is improved, but the device complexity increases due to additional components and connection requirements
Solution Approach 1:
The excitation power supply automatically detects incorrect polarity connections through voltage detection and provides appropriate warnings or protection, making the system self-diagnosing and self-protecting without requiring external monitoring equipment
Solution Approach 2:
The system implements feedback by detecting the voltage polarity between terminals and providing feedback signals to indicate correct or incorrect connection status, enabling real-time monitoring and correction of connection errors
2Reliability
If the excitation power supply connects with proper polarity to ensure correct current flow during quenching, then the reliability is improved, but the ease of operation deteriorates due to strict polarity requirements increasing connection difficulty
Solution Approach 1:
The system performs preliminary voltage polarity detection before enabling normal operation, detecting potential connection errors in advance and providing warnings to operators before they can cause damage
Solution Approach 2:
The voltage detection circuit acts as an intermediary between the power supply and the superconducting coil, mediating the connection by monitoring polarity and preventing incorrect operation through intermediate detection and warning stages
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 solution effectively reduces the risk of damage from thermal runaway by ensuring correct current flow and detection of polarity errors, thereby enhancing the reliability and cost-effectiveness of the superconducting magnet device.
Implementation Method 1
a superconducting coil; When quenching occurs, the superconducting coil transitions from a superconducting state to a normal conducting state
Implementation Method 2
a large electromagnetic force can act on the superconducting coil due to a transient current unbalance when quenching occurs
Implementation Method 3
The protection circuit is usually disposed in a cryogenic environment together with the superconducting coil and cooled to the same temperature
Implementation Method 4
The excitation power supply is configured to detect incorrect connection with the superconducting coil when the excitation power supply is connected to the superconducting coil with a polarity opposite to the proper polarity
Data Source
AI summary
A superconducting magnet device includes a superconducting coil, a quenching protection circuit that is connected in parallel to the superconducting coil and that allows a current in one direction, and an excitation power supply that is connected to the superconducting coil with proper polarity determined such that a current flows in the one direction to the quenching protection circuit when quenching occurs in the superconducting coil, and excites the superconducting coil. The excitation power supply is configured to detect incorrect connection with the superconducting coil when the excitation power supply is connected to the superconducting coil with a polarity opposite to the proper polarity.