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在许多超导电力设备的应用中,超导绕组的机械性能和电流过载能力是关乎设备运行安全性和可靠性的重要现实问题。利用铜线(或铜带)与高温超导带材平行绕制的方法是解决这一问题的可行方案之一。但这种方案有可能带来额外的交流损耗。为了研究这一问题,制作了两个尺寸相同的超导绕组,绕组内径70mm,外径90mm,高45mm,其中一个绕组由超导带与铜带并绕而成,另一个则由超导带材单独绕制而成。两个样品使用的超导带材均为一代Bi-2223/Ag高温超导带,宽4.6mm,厚0.22mm;铜加强带宽5mm,厚0.1mm。采用了卡路里法对比研究了两个样品的交流损耗。实验结果显示加入铜带没有明显增加超导绕组的交流损耗。因此,超导绕组中并绕铜带不失为一种有效提高超导绕组机械性能和过载能力的方法,在超导电力设备中有一定的应用价值。
In many applications of superconducting power devices, the mechanical properties and the current overload capability of the superconducting windings are important practical issues related to the safety and reliability of the equipment operation. The use of copper wire (or copper strip) and high temperature superconducting tape parallel winding method is one of the feasible solution to this problem. However, this solution may bring additional exchange loss. In order to study this problem, two superconducting windings of the same size have been made. The winding diameter is 70mm, the outer diameter is 90mm and the height is 45mm. One of the windings is made of superconducting tape and copper tape and the other is superconducting tape Material alone wound. The superconducting tapes used in the two samples are all Bi-2223 / Ag high temperature superconducting tapes with a width of 4.6 mm and a thickness of 0.22 mm. The copper reinforcing tape has a width of 5 mm and a thickness of 0.1 mm. The calorie method was used to compare the AC loss of two samples. Experimental results show that adding copper tape does not significantly increase the AC loss of superconducting windings. Therefore, superconducting windings and around the copper strip is an effective way to improve the superconducting winding mechanical properties and overload capacity in the superconducting power equipment has a certain value.