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Device for measuring critical current properties of high-temperature superconductor by using variable-cross-section current lead wire

A current lead, critical current technology, applied in the application field of superconducting technology

Active Publication Date: 2012-10-03
CHINA ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004]Because the lead wire is in the temperature difference between room temperature and cryogenic liquid, the closer the lead wire is to the low temperature end, the greater the thermal conductivity and the smaller the resistivity, resulting in conduction heat leakage Larger, less Joule heat, and at the same time, the cooling gas temperature at the lower part of the lead is the lowest, and the cooling capacity is higher. The traditional equal-section current lead does not take advantage of these characteristics of the upper current lead, resulting in a waste of cooling gas and an indirect increase in cooling costs.

Method used

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  • Device for measuring critical current properties of high-temperature superconductor by using variable-cross-section current lead wire
  • Device for measuring critical current properties of high-temperature superconductor by using variable-cross-section current lead wire
  • Device for measuring critical current properties of high-temperature superconductor by using variable-cross-section current lead wire

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Embodiment Construction

[0016] For describing the design principle of the present invention in detail, figure 1 It is the heat flow distribution diagram of a typical air-cooled current lead. According to the classical heat transfer law, the heat flow of each part can be analyzed as follows:

[0017] (1) According to Fourier's heat conduction law, the heat passing through the section at any position x of the current lead can be obtained as

[0018] Q = - KA dT dx - - - ( 1 )

[0019] In the formula, Q is the heat flow, which refers to the heat passing through a certain cross-sectional area per unit time, and the unit is W; K is the thermal conductivity or thermal conductivity, which reflects the thermal conductivity of the object, which is often measured by experiments, and the unit is W / (mK); A is the cross-sectional area of ​​the lead wir...

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Abstract

The invention relates to a device for measuring critical current properties of a high-temperature superconductor by using a variable-cross-section current lead wire. The straight copper bar variable-cross-section current lead wire used by the device uses the improved gas-cooled current lead wire segmented calculation method to carry out the optimized design of geometric parameters of the variable-cross-section current lead wire; and a mixed lead wire section which is formed by welding a copper stranded wire and a BSCCO tape in parallel is used for connecting the tail end of the straight copper bar variable-cross-section current lead wire with a YBCO tape. The device achieves the purposes of reducing the heat leakage of current and reducing the cooling cost of a system for testing the critical current properties of YBCO through the mixed structure.

Description

technical field [0001] The invention relates to a device for measuring the critical current characteristics of a high-temperature superconductor by using a variable-section current lead, belonging to the application field of superconducting technology. Background technique [0002] The experiment of testing the critical properties of high-temperature superconductors is known as one of the most classic experiments in the history of modern physics. The critical current characteristic is one of the three critical characteristics of a superconductor. In the experiment of critical current characteristics of high-temperature superconductors, the high-temperature superconducting tape is usually immersed in low-temperature liquid (such as liquid nitrogen, liquid helium), and different critical current values ​​are measured by changing the magnitude and direction of the magnetic field. [0003] The current leads play a very important role in the experiment of measuring the critical...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00
Inventor 诸嘉慧田军涛张宏杰丘明
Owner CHINA ELECTRIC POWER RES INST