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Superconducting magnet quenching protection device

A superconducting magnet, quench protection technology, applied in superconducting magnets/coils, emergency protection circuit devices, emergency protection devices with automatic disconnection, etc. And other issues

Active Publication Date: 2014-01-22
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Superconducting magnet 1 may take a long time to propagate after quenching to obtain an induced voltage that exceeds the threshold voltage of the middle diode assembly 2, and the heater cannot start conducting electricity fast enough to eliminate the risk of coil damage

Method used

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  • Superconducting magnet quenching protection device
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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0020] Such as figure 2 As shown, the superconducting magnet 1 applicable to the present invention is composed of a plurality of coils L1-L6 connected in series. A superconducting switch 4 is connected in parallel at both ends of the superconducting magnet 1 to realize the permanent mode operation of the superconducting magnet 1 . The superconducting switch 4 is a section of superconducting wire connected in parallel with the superconducting magnet 1 and equipped with a heater attached thereto. Both ends of the superconducting switch 4 are connected in parallel with a superconducting switching diode assembly 3 for protection, and the superconducting switching diode assembly 3 is composed of a plurality of diode pairs connected in series in a back-to-back and anti-parallel manner.

[0021] The lead wire of the heater in the superconducting swi...

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Abstract

The invention discloses a superconducting magnet quenching protection device, which consists of a heater circuit (17) and a quenching detector (11), wherein each coil of a superconducting magnet (1) is provided with a heater which is attached to the coil; all heaters are connected in series with one another and then connected in series with two diode components (2 and 8) to form the heater circuit (17); the quenching detector (11) detects whether the superconducting magnet (1) is quenched by acquiring terminal voltages of the respective coils of the superconducting magnet (1); and if the superconducting magnet (1) is determined to be quenched, the quenching detector (11) triggers a superconducting switch (4) to be quenched, voltages which are generated by quenching of the superconducting switch (4) are simultaneously applied to two ends of the heater circuit (17), and a current starts flowing through the heater to trigger all coils to be locally quenched.

Description

technical field [0001] The invention relates to a protection device against superconducting magnet quenching, in particular to a protection device for superconducting magnets used in MRI or NMR imaging systems not to be damaged during quenching. Background technique [0002] Superconductors used in superconducting magnets can only exhibit superconducting properties when certain conditions (such as temperature, magnetic field, current density) are met. Once the conditions are destroyed, superconductors will undergo quenching. A small part of the superconductor ceases to be superconducting and enters a resistive state. Any current flowing through this resistive part will cause local Joule heating. This will cause quenching in adjacent parts of the superconductor, resulting in a larger resistive volume, which in turn leads to further Joule heating. [0003] A superconducting magnet may store energy on the order of megajoules, which will be dissipated in the resistive volume ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H5/00H01F6/00
Inventor 陈顺中王秋良
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI