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Excitation power supply for superconducting magnet and method of operation thereof

A technology of superconducting magnet and excitation power supply, which is applied in the usage of superconducting elements, electrical components, emergency protection circuit devices, etc., can solve the problem of cutting off danger and achieve the effect of preventing damage

Inactive Publication Date: 2017-09-12
JAPAN SUPERCONDUCTOR TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when a huge current passes, it is dangerous to cut off (intercept) the interconnection (connection)

Method used

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  • Excitation power supply for superconducting magnet and method of operation thereof
  • Excitation power supply for superconducting magnet and method of operation thereof
  • Excitation power supply for superconducting magnet and method of operation thereof

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0058] figure 1 It is a configuration diagram showing the field power supply 101 according to the first embodiment of the present invention.

[0059] (Structure of the excitation power supply 101)

[0060] The excitation power source 101 is connected to the superconducting coil 2L, and is a power source for exciting the superconducting magnet 2 including the superconducting coil 2L. The superconducting coil 2L is wound from a superconducting wire.

[0061] like figure 1 As shown, the excitation power supply 101 includes a power supply 1, a power unit 3, a first shunt resistor (first current detector) and a protection circuit 16 (protection device).

[0062] (power supply)

[0063] The power source 1 includes a transformer (not shown) connected to an AC power source, a transistor circuit (not shown) for supplying a smooth DC current rectified by the AC power of the transformer to the superconducting coil 2L, and the like. In addition, a commercially available switching reg...

no. 2 Embodiment approach

[0093] image 3 It is a configuration diagram showing the field power supply 201 according to the second embodiment of the present invention. The only difference from the first embodiment lies in the position of the first shunt resistor (first current detector). In the present embodiment, the first shunt resistor 5 is provided in parallel with the superconducting coil 2L. In this way, the first shunt resistor 5 may be provided at a position where the current IA passing through the superconducting coil 2L after the contact 4a of the protective relay is closed can be detected. In other words, the first shunt resistor 5 is arranged in series with the contact 4a, and is arranged between the output loop B of the power unit 3 and the loop A on the side of the superconducting coil 2L when the contact 4a is closed. public part.

[0094] In this embodiment, the current control circuit 9 increases the output current value of the power unit 3 at a predetermined scan rate, so that the ...

no. 3 Embodiment approach

[0102] Figure 4 It is a configuration diagram showing the field power supply 301 according to the third embodiment of the present invention. This embodiment differs from the first embodiment mainly in that the field power supply 301 of this embodiment includes two (multiple) power units. In addition, the field power supply may include three or more power units.

[0103] like Figure 4 As shown, the excitation power supply 301 includes a power supply 1, a first power unit 13, a second power unit 23, a first shunt resistor 5 (first current detector), a main control circuit 12 (main control device), a distributor 14 ( command distribution device), scan rate setter 33, protection circuit 16 (protection device), reset button 32 and reset circuit 131.

[0104] (1st current detector)

[0105] The first shunt resistor 5 is a current detector that detects the output current value of the entire excitation power supply 301 . In addition, the first current detector is installed to b...

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Abstract

PROBLEM TO BE SOLVED: To provide an excitation power supply for a superconducting magnet capable of restoring a normal state (state where short-circuit has not occurred) promptly after that (after power restoring in the case of a power failure) even in the case where both ends of an output of the excitation power supply have been short-circuited due to wrong detection of abnormal conditions such as quench / internal abnormalities / instantaneous drop of an original power source, or even in the case of occurring of a power failure of the original power source.SOLUTION: An excitation power supply 101 comprises: a power source 1; a power unit 3; a protection circuit 16 making a protection state by closing a contact 4a to short-circuit both ends of an output of a power unit 3 in the case of detecting an anomaly of a superconducting magnet 2; and a first shunt resistance 5 that detects a current value within a loop A. The excitation power supply 101 is provided with a restoring circuit 31 which opens the contact 4a and restores the protection state after making an output current value of the power unit 3 equal to a current value flowing through a superconducting coil 2L using a detection value of the first shunt resistance 5 and a second shunt resistance 8 in the case where the contact 4a is closed with a protection relay 4 operated by the protection circuit 16.

Description

[0001] This application is a divisional application of the invention patent application with the application number "201010536637.4". The application date of the invention patent with the application number "201010536637.4" is November 04, 2010, and the title of the invention is "excitation power supply for superconducting magnet and its operation method". technical field [0002] The present invention relates to field power supplies for superconducting magnets and methods of operation thereof. Background technique [0003] There is a so-called quench phenomenon in a superconducting magnet, that is, a phenomenon in which a voltage is generated due to the destruction of the superconducting state and zero resistance changes to a normal conductive state. High voltages will appear in superconducting magnets composed of superconducting coils. In addition, conversely, if the current changes rapidly due to a problem in the excitation power supply itself, it will interact with the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/00
CPCY02E40/60
Inventor 永浜恭秀神门刚
Owner JAPAN SUPERCONDUCTOR TECH