In recent years, considerable progress has been made in the development of HTS DC power transmission (PT) systems. Despite the fact that the Joule heating loss is practically absent in HTS DC cable, the energy, however, must be spent to remove heat that penetrates into the cryogenic zone from the outside. Among others, heat loss occurs through the current leads, which are usually designed for the high current. There is a large number of models of cryogenic current leads, but Wiedemann-Franz law limits their effectiveness. The alternative method to reduce significantly that loss is to use a Peltier element installed in series in the power circuit acting as a heat pump working against the natural heat flow. Peltier current leads (PCLs) were first applied for industrial purposes on 500 m long HTS DC PT line in Ishikari (Hokkaido).
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机译：近年来，在HTS直流电力传输（PT）系统的开发中取得了相当大的进展。尽管焦耳加热损失几乎不存在于HTS DC电缆中，但必须花能量去除从外部渗透到低温区中的热量。其中，通过电流引线发生热量损失，该引线通常设计用于高电流。有大量的低温电流导线，但Wiedemann-Franz法律限制了他们的有效性。替代方法显着降低该损失是使用在功率电路中串联安装的珀耳帖元件作为加热泵，该热泵用于针对天然热流的热泵。 Peltier目前的引线（PCLS）首先应用于Ishikari（北海道）的500米长的HTS DC PT线路工业目的。
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