AC losses in two, one-meter-long lengths of HTS prototype multi-strand conductors (PMC's) are measured with a temperature-difference calorimeter. Both single-phase and three-phase losses are examined with ac currents up to 1000 A rms. The calorimeter, designed specifically for these measurements, has a precision of 1 mW. PMC #1 has two helically-wound, non-insulated layers of HTS tape (19 tapes per layer), each layer wrapped with opposite pitch. PMC #2 is identical except for insulation between the layers. The measured ac losses show no significant effect of interlayer insulation and depend on about the third power of the current - a result in agreement with the Bean-Norris model adapted to the double-helix configuration. The three-phase losses are a factor of two higher that those exhibited by a single isolated conductor, indicating a significant interaction between phases.
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机译：使用温差量热仪测量HTS原型多股导体（PMC）的两米长一米长的交流损耗。使用高达1000 A rms的交流电流检查单相和三相损耗。专为这些测量而设计的量热仪的精度为1 mW。 PMC＃1具有两层螺旋缠绕的非绝缘HTS胶带层（每层19条胶带），每一层以相反的间距缠绕。 PMC＃2除各层之间的绝缘外相同。测得的交流损耗没有显示出中间层绝缘的显着影响，并且大约取决于电流的三次方，这一结果与适用于双螺旋结构的Bean-Norris模型一致。三相损耗比单个隔离导体所表现出的损耗高两倍，这表明各相之间存在明显的相互作用。
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