Superconducting coil quench detection method

A technology of superconducting coils and detection methods, which is applied in the directions of measuring electricity, measuring devices, and measuring heat, and can solve problems such as low sensitivity and slow detection speed of temperature rise method

Inactive Publication Date: 2008-02-20
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages of slow detection speed and low sensitivity of the existing temperature...

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  • Superconducting coil quench detection method

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Embodiment Construction

[0052] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0053] Fig. 1 and Fig. 2 are specific embodiments of quench detection of a Bi2223 superconducting coil according to the present invention.

[0054] The Bi2223 superconducting coil parameters are as follows:

[0055] Structure: two double cakes;

[0056] Inner diameter: 118mm;

[0057] Outer diameter: 184.2mm;

[0058] Height: 22mm;

[0059] Critical current: 37.77A;

[0060] Axial maximum field strength: 7.863×10 -3 T;

[0061] Radial maximum field strength: 5.243×10 -3 T;

[0062] Resistance: 7.4Ω;

[0063] Inductance: 43.7mH.

[0064] Before the detection starts, the temperature rise rate threshold of the superconducting coil is firstly determined. The average value of the temperature rise rate on both sides of the quench point when the voltage rises to 1 μV / cm is the temperature rise rate threshold.

[0065] As shown in Figure 1,...

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Abstract

The utility model relates to a quench detecting method of superconducting coils, which is characterized in detecting the temperature of superconducting coil winding at real time; a quench detecting value (temperature rising rate) is acquired by the means that the difference value on adjacent temperature in time is divided by time interval of temperature detection. By comparing the temperature rising rate with the threshold value of the temperature rising rate, the coil quench can be judged if the temperature rising rate exceeds the threshold valve. The determination method on the threshold value of the temperature rising rate is to detect the voltage and the temperature near the quench point at the same time in the process of detecting quench on the superconducting coil and to transform the temperature into the temperature rising rate. When the voltage rises to 1MuV/cm, coil quenches and the mean value of the temperature rising rate on both side of quench point is the threshold value of the temperature rising rate. The utility model is closer to the essence of physical phenomenon and has the advantages of fast detecting speed and high sensitivity. The utility model is applicable for low temperature superconducting (NbTi, Nb3Sn, MgB2) coils and high temperature superconducting (Bi2223, YBCO) coils.

Description

Technical field: [0001] The invention relates to a quench detection method of a superconducting coil. Background technique: [0002] The core components of superconducting devices such as superconducting magnets, electric motors, transformers, current limiters and energy storage systems are superconducting coils. A superconductor can only operate below the critical temperature, critical magnetic field and critical current, otherwise it will lose its superconductivity. The phenomenon of a superconductor losing its superconductivity is called quenching. When the superconductor is in the superconducting state, the resistance is very small, which can be regarded as zero, and there is no voltage on the superconductor; once any of the three parameters exceeds the critical value, the superconductor will lose superconductivity and become a normal state, and the resistance will increase. A voltage appears across the superconductor. Internationally, the voltage on the superconductor...

Claims

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Application Information

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IPC IPC(8): G01R31/00G01K7/18
Inventor 张正臣李晓航
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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