Six-point method roll-to-roll transmission type high-temperature superconducting long strip critical current testing device and method

Abstract

The invention discloses a six-point method roll-to-roll transmission type high-temperature superconducting long belt critical current testing device and method, and the device comprises a testing cabin, a cabin cover and an unwinding cabin; the cabin cover is disposed above the testing cabin, the unwinding cabin is disposed at the central position of the top of the cabin cover, and the two sides of the top of the cabin cover are provided with driving cabins. U-shaped frames are arranged on the two sides of the bottom in the test bin, baffles are arranged at the tops of the U-shaped frames, pneumatic cylinders are arranged in the two sets of driving bins, and the output ends of the two sets of pneumatic cylinders extend into the two sets of U-shaped frames correspondingly. According to theinvention, six-point test is utilized, in a main measurement section, according to the measurement standard of a superconducting tape sample, when a voltage measurement value reaches a cut-off voltagevalue greater than VC, a current source stops flowing, the measurement of the section is completed, and in two auxiliary measurement sections, the artificially set voltage upper limit value is higherthan the set multiple of the cut-off voltage value of the main measurement section relative to VC; therefore, the auxiliary measuring section is prevented from being damaged.

Description

technical field [0001] The invention relates to the technical field of superconducting tapes, in particular to a six-point roll-to-roll transmission type high-temperature superconducting long tape critical current testing device and method. Background technique [0002] Practical high-temperature superconducting materials mainly include the first-generation Bi-based PIT strips and the second-generation Y-based coated conductor strips; because the ability of these two types of superconducting strips to carry current, that is, the critical current, has a great impact on the internal materials. The presence of microstructural defects is quite sensitive; [0003] The measurement standard for the critical current of high-temperature superconducting materials generally adopts the four-lead method, that is, connect the current lead and the voltage lead at both ends of the material, the current lead is outside, and the voltage lead is inside. When measuring, the current I is from I ...

AI Technical Summary

Problems solved by technology

[0003] The measurement standard for the critical current of high-temperature superconducting materials generally adopts the four-lead method, that is, connect the current lead and the voltage lead at both ends of the material, the current lead is outside, and the voltage lead is inside. When measuring, the current I is from I a flow to I b , monitor the voltage drop V=V a –V b , and according to the obtained I-V curve data, determine its critical current I c , the problem that said method exists is: I a to V a and V b to I b During the measurement, there is no monitoring and protection, when the critical current is lower than the main measurement section "V a -V b ” may be damaged; in the measurement of long superconducting tape, the current lead needs to inject a current of up to hundreds of amperes into the superconducting tape through the crimping method. The interface of the surface generates heat, which will cause damage in severe cases. Therefore, the present invention proposes a six-point method roll-to-roll transmission type high-temperature superconducting long tape critical current testing device and method to solve the problems existing in the prior art

Images