Abstract
The effects of inhomogeneous critical current (I c ) and n-value on the degradation or permanent damage of REBCO coated conductors (CCs) were investigated through repetitive quench tests and overcurrent tests. In the repetitive quench tests, the I c values of the REBCO CC samples at the sections with the high n-values were degraded easily due to the existence of thermal stress. Furthermore, the overcurrent test results showed that the REBCO CC samples burned out only at the section with the highest n-value, regardless of their I c values and the manufacturing process. Therefore, this study confirmed that the n-value of an REBCO CC is one of the essential factors affecting the degradation or permanent damage of CCs in the overcurrent condition.
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