中文摘要：

在液氮（77K）环境下对YBCO涂层导体的交、直流失超传播特性进行了研究。测量了交、直流情况下的失超传播速度以及最小失超能量；分析了超导带材的失超传播速度与传输电流的关系；推导了一维模型下的失超传播速度计算公式。结果表明，当带材的传输电流交流（有效值）与直流相同时，交、直流失超传播速度基本一致，交流的最小失超能略小，且随着传输电流的增大最小失超能间的差距加大。

英文摘要：

AC and DC quench behavior of the YBCO coated conductor in liquid nitrogen （77K） was studied in this paper. The normal zone propagation velocity （NZPV） and the minimum quench energy（MQE） were both measured. The experimental results can be concluded that the NZPVS for DC and AC was basically the same with each other if the value of AC current （rms） was the same with the DC value. However, the MQE for the AC was smaller than the one for DC. And the difference became lar- ger when the transport current increased.