CALORIMETRIC APPARATUS FOR ALTERNATING CURRENT LOSS MEASUREMENTS ON HIGH-TEMPERATURE SUPERCONDUCTORS
CALORIMETRIC APPARATUS FOR ALTERNATING CURRENT LOSS MEASUREMENTS ON HIGH-TEMPERATURE SUPERCONDUCTORS
复制标题
用于测量高温超导体交变电流损耗的量热装置
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
S. Hörnfeldt
中科院分区：
文献类型：
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作者：
N. Magnusson;S. Hörnfeldt
在电力元件中使用高温超导体需要了解其交流损耗。因此，需要一些方法来表征导体在类似应用的条件下的交流损耗。在本文中，我们描述了一种测量变温交流外磁场中交流传输电流的长长高温超导体交流损耗的量热装置。可变温度是通过样品和冷却机之间的热连接实现的。铜线圈中的电流产生平行于磁带平面并垂直于传输电流的磁场。这种电流可以在线圈形成的样品中感应。用两种略有不同的方法来确定交流损耗，一种方法是将交流损耗引起的样品温升与参考加热器引起的温升进行比较，另一种方法是将功率损耗的增加与参考加热器的温升进行比较。
The use of high-temperature superconductors in electric power components requires the knowledge of their alternating current (ac) losses. Methods are therefore needed to characterize the conductors with respect to their ac losses under applicationlike conditions. In this article we describe a calorimetric setup for ac loss measurements on long length high-temperature superconductors carrying ac transport currents in ac external magnetic fields at variable temperatures. The variable temperature is achieved by a thermal connection between the sample and a cooling machine. Current in copper coils generates the magnetic field parallel to the plane of the tape and perpendicular to the transport current. This current can be induced in the coil-formed sample. Two slightly different methods are used to determine the ac losses, one in which the temperature rise of the sample, caused by the ac losses, is compared to the temperature rise caused by a reference heater and another in which the increase in power dissipa...