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Excitation source for superconducting magnet and its operating method

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: 2014-01-29
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 source for superconducting magnet and its operating method
  • Excitation source for superconducting magnet and its operating method
  • Excitation source for superconducting magnet and its operating method

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0056] figure 1 It is a configuration diagram showing the field power supply 101 according to the first embodiment of the present invention.

[0057] (Structure of the excitation power supply 101)

[0058] 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.

[0059] Such as 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).

[0060] (power supply)

[0061] 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 ...

no. 2 Embodiment approach

[0091] 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 circuit B of the power unit 3 and the circuit A on the side of the superconducting coil 2L when the contact 4a is closed. public part.

[0092] In this embodiment, the current control circuit 9 increases the output current value of the power unit 3 at a predetermined scan rate, so tha...

no. 3 Embodiment approach

[0100] 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.

[0101] Such as 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.

[0102] (1st current detector)

[0103] 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 t...

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Abstract

Provided is an excitation source for a superconducting magnet, which can quickly return to a normal state (a state of no short circuit) even when the two output ends of the excitation source undergo a short circuit, caused by abnormal situations like an incorrect quench detection, an internal abnormity and a sudden reduction in main power supply voltage, or when power is restored after being cut off. An excitation source (101) comprises a power supply (1), a power unit (3), a protective circuit (16) which will be closed to protect contacts (4a) undergoing short circuit at two output ends of the power unit (3) when an abnormality occurs, and a first shunt resistance (5) detecting the current value in a return circuit A, and a resetting circuit (31). After a protective relay (4) moves, closing the contact (4a) through the protective circuit (16), the resetting circuit (31) is reset from a protective state through disconnecting the contact (4a) by adopting the detection value of the first shunt resistance (5) and a second shunt resistance (8) and making the output current value of the power unit (3) and the current value passing through a superconducting coil (2L) being equal.

Description

technical field [0001] The present invention relates to field power supplies for superconducting magnets and methods of operation thereof. Background technique [0002] 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 occurrence of the above-mentioned quench. On the excitation power supply side, the power element may be damaged due to high voltage or large energy that has lost its destination due to reverse flow, and on the superconducting magnet side, the superconducting magnet may be damaged due to a quench due to a sudden change in current. [0003] Therefore, when an ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/00
CPCY02E40/68Y02E40/60
Inventor 永浜恭秀神门刚
Owner JAPAN SUPERCONDUCTOR TECH
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