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CN-122025337-A - Quench protection system and method for high temperature superconducting magnet

CN122025337ACN 122025337 ACN122025337 ACN 122025337ACN-122025337-A

Abstract

The invention discloses a quench protection system and a quench protection method for a high-temperature superconducting magnet, wherein the quench protection system comprises the high-temperature superconducting magnet, a plurality of magnetic bodies, a plurality of magnetic coils and a plurality of magnetic coils, wherein the magnetic bodies are arranged in a stacked manner; the device comprises a data acquisition module, a quench protection module, a control module and a control module, wherein the data acquisition module is provided with a temperature detection module used for acquiring the temperature of each magnetic body, the quench protection module is provided with a heating module used for heating the magnetic body and an energy discharging module used for discharging the stored energy of the high-temperature superconducting magnet, and the control module is used for receiving the temperature data of the temperature detection module and controlling the start and stop of the heating module and the start and stop of the energy discharging module based on the temperature data. According to the quench protection system and method for the high-temperature superconducting magnet, the heating module and the temperature detection module are embedded into the structural layout of the high-temperature superconducting magnet, and the problems that the quench protection scheme of the high-temperature superconducting magnet is poor in adaptability, obvious in protection delay, high in local overheat risk and easy to generate mutual inductance interference in a heating unit can be solved by matching with the structural optimization of the heating belt and the selection of the insulating layer material of the heating module.

Inventors

  • LU JIAQI
  • QU TIMING
  • SONG PENG
  • LIU YULONG
  • XU ZIYANG

Assignees

  • 清华大学

Dates

Publication Date
20260512
Application Date
20260212

Claims (18)

  1. 1. A quench protection system for a high temperature superconducting magnet, the quench protection system comprising: A high temperature superconducting magnet having a plurality of stacked magnetic bodies; The data acquisition module is provided with a temperature detection module for acquiring the temperature of each magnetic body; the quench protection module is provided with a heating module for heating the magnetic body and an energy discharging module for discharging the stored energy of the high-temperature superconducting magnet; And the control module is used for receiving the temperature data of the temperature detection module and controlling the start and stop of the heating module and the start and stop of the energy discharging module based on the temperature data.
  2. 2. The quench protection system of a high temperature superconducting magnet of claim 1, wherein the magnet body is of a single-pancake structure and the temperature detection module is disposed on one of the surfaces of the magnet body.
  3. 3. The quench protection system of a high temperature superconducting magnet of claim 2, wherein the heating module is disposed on another surface of the magnetic bodies, and the heating module and the temperature detection module between two adjacent magnetic bodies are separated by an isolation structure.
  4. 4. The quench protection system of a high temperature superconducting magnet of claim 1, wherein the magnetic bodies are of a double-pancake structure, and the temperature detection module is disposed between two adjacent magnetic bodies.
  5. 5. The quench protection system of high temperature superconducting magnets of claim 4 wherein the heating module is disposed between two windings of the magnetic body.
  6. 6. The quench protection system of a high temperature superconducting magnet according to any of claims 1-5, wherein the heating module comprises a heating structure and two insulating layers sandwiched on both sides of the heating structure, the heating structure having heating strips reciprocally arranged to form the heating structure.
  7. 7. The quench protection system of a high temperature superconducting magnet of claim 6, wherein the material of the heating tape is a conductive material and the material of the insulating layer is a polyimide material or a flexible polymer material.
  8. 8. The quench protection system of high temperature superconducting magnets of claim 6 wherein the surface of the insulating layer in contact with the magnet body is coated with a high thermal conductivity insulating silicone grease layer.
  9. 9. The quench protection system of high temperature superconducting magnets of claim 6 wherein the temperature detection module is a distributed fiber optic sensor.
  10. 10. The quench protection system of a high temperature superconducting magnet of claim 4 wherein the control module controls the heating module to heat the high temperature superconducting magnet until the high temperature superconducting magnet is quenched when the temperature data is greater than a normal operating temperature of the high temperature superconducting magnet.
  11. 11. The quench protection system of high temperature superconducting magnets of claim 10 wherein the control module controls the de-energizing module to de-energize the quenched high temperature superconducting magnets.
  12. 12. The quench protection system of a high temperature superconducting magnet according to claim 1, wherein the energy discharging module is arranged in parallel with the high temperature superconducting magnet and comprises an energy discharging resistor and a first switching device for controlling whether the energy discharging resistor is connected or not, and when the high temperature superconducting magnet is in quench, the energy discharging resistor is connected into a circuit through the first switching device.
  13. 13. The quench protection system of a high temperature superconducting magnet according to claim 1, wherein the heating module includes a plurality of heating resistors and a second switching device arranged in series, and the high temperature superconducting magnet is actively heated by switching on the heating resistors through the second switching device when it is judged that the high temperature superconducting magnet may be about to quench or has started to quench.
  14. 14. A quench protection method for a high temperature superconducting magnet, the quench protection method comprising: Collecting the temperature of the high-temperature superconducting magnet; judging whether the current temperature of the high-temperature superconducting magnet exceeds the normal operation temperature value of the high-temperature superconducting magnet; And performing quench protection on the high-temperature superconducting magnet based on the difference value between the current temperature of the high-temperature superconducting magnet and the normal operation temperature value.
  15. 15. The quench protection method of a high temperature superconducting magnet according to claim 14, wherein quench protecting the high temperature superconducting magnet based on a difference between a current temperature of the high temperature superconducting magnet and the normal operating temperature value comprises: if the current temperature of the high-temperature superconducting magnet is greater than or equal to the normal operation temperature value, heating the high-temperature superconducting magnet; If the current temperature of the high-temperature superconducting magnet is smaller than the normal operation temperature value, continuously judging whether the current temperature of the high-temperature superconducting magnet exceeds the normal operation temperature value.
  16. 16. The method of claim 14 or 15, further comprising heating the high temperature superconducting magnet until the high temperature superconducting magnet quenches.
  17. 17. The method of claim 16, further comprising de-energizing the high temperature superconducting magnet after the high temperature superconducting magnet is quenched.
  18. 18. The method of claim 14, further comprising voltage monitoring the high temperature superconducting magnet and quench protecting the high temperature superconducting magnet when a current voltage of the high temperature superconducting magnet exceeds a voltage threshold.

Description

Quench protection system and method for high temperature superconducting magnet Technical Field The invention relates to the technical field of superconducting magnets, in particular to a quench protection system and a quench protection method for a high-temperature superconducting magnet. Background As an important electromagnetic device, a superconducting (such as REBCO) magnet has wide application in the fields of magnetic resonance imaging, nuclear magnetic resonance, particle accelerators and the like. Due to the special properties of high temperature superconducting materials, when the operating environment of the magnet changes or is disturbed by the outside, a quench phenomenon, i.e. the transition of the superconducting state to the normal state, may occur. A large amount of heat and resistance can be generated in the quench process, and if the quench is not handled in time, damage to the magnet and even safety accidents can be caused. Therefore, the establishment of an effective quench protection system is critical to ensure safe operation of the high temperature superconducting magnet. At present, a high-temperature superconducting magnet adopting an insulation-free winding technology has certain self-protection capability by means of an inter-turn shunt mechanism. However, as the high-temperature superconducting magnet is developed to a large-sized and high-energy-storage direction, the inherent defect of slow quench propagation speed is highlighted under extreme working conditions (for example, the current carrying of a conductor is higher or the magnet is in a strong magnetic field environment), so that the huge energy storage of the magnet cannot be rapidly and uniformly dissipated, and the risk of local overheating and even strip burning still exists. Therefore, for an application scenario with a high security level, it is difficult to meet the reliability requirement only by relying on the inherent self-protection mechanism. Active thermal quench protection is a mature and effective technique in the field of low temperature superconducting magnets. However, this technique has long failed to be applied to high temperature superconducting magnets, mainly facing three major obstacles: Firstly, the traditional active heating scheme is difficult to be compatible with a cake-shaped structure commonly adopted by a high-temperature superconducting magnet, and the conventional heating element cannot realize deep embedding and high-efficiency thermal coupling on the premise of not influencing the insulation and mechanical integrity of a winding; Secondly, because the high-temperature superconducting strip has higher heat capacity and stability, the energy injection time window required for triggering the global quench of the high-temperature superconducting strip is extremely short, and the traditional arrangement mode and temperature feedback (such as a metal sensor) are slow in response, so that quick and reliable intervention cannot be completed before the local hot spot formed by the natural quench spreads; Thirdly, the heating loop placed in the strong changing magnetic field is easy to generate obvious mutual inductance, interfere the normal working magnetic field of the magnet, and even induce extra loss or instability. Disclosure of Invention The invention aims to provide a quench protection system and a quench protection method for a high-temperature superconducting magnet, which solve the problems of poor suitability of a quench protection scheme of the high-temperature superconducting magnet, obvious protection delay, high local overheat risk and easy mutual inductance interference of a heating unit. The implementation purpose of the invention is mainly realized by the following technical scheme: the invention provides a quench protection system for a high temperature superconducting magnet, comprising: A high temperature superconducting magnet having a plurality of stacked magnetic bodies; The data acquisition module is provided with a temperature detection module for acquiring the temperature of each magnetic body; the quench protection module is provided with a heating module for heating the magnetic body and an energy discharging module for discharging the stored energy of the high-temperature superconducting magnet; And the control module is used for receiving the temperature data of the temperature detection module and controlling the start and stop of the heating module and the start and stop of the energy discharging module based on the temperature data. According to one embodiment of the invention, the magnetic body is in a single cake structure, and the temperature detection module is arranged on one surface of the magnetic body. According to one embodiment of the invention, the heating module is arranged on the other surface of the magnetic body, and the heating module and the temperature detection module between two adjacent magnetic bodies are separated through an isolation st