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Abstract: AС losses are an important issue in HTS power cables development especially when using low loss 2G wires. Still not so much experimental studies were performed on this subject with representative cables’ models. For cables made from 1G wires some theoretical models adequately describes losses while they does not works well enough for 2G AC losses. To study the problem, the test facility and AC loss measurement methods with 5 m HTS model cables have been developed in Russian Cable Institute. Several 5 m HTS cables made of both 1-G and 2-G wires have been produced and tested at this facility. 2-G cables have different substrates both weakly magnetic and nonmagnetic once. In this paper we present data obtained for AC loss in HTS power cable models. Theoretical analysis of losses has been done as well, including substrate losses and the losses in a superconductor. Superconducting losses dominate in cables made of 1G HTS wires, while in 2G cables magnetic substrate may dominate at low currents. Several mechanisms affected AC losses due to parallel and perpendicular magnetic fields in a cable are taken into account. Theoretical and experimental data are compared and discussed. [Copyright &y& Elsevier]

Abstract: 1.5/2 kA – 20kV has been developed and passed acceptance test in December 2009. This cable has superconducting shield and is made of DI-BSSCO™ HT-CA wires from Sumitomo Electric Company. The cable is installed at the experimental test facility to undergo extensive tests first, than it will be reinstalled to Moscow utility grid. As a part of the wide test program the fault current tests and high voltage tests were performed with pieces of the full length cable – so called witness samples. 44 kA fault current test has been performed as well as high voltage test for cable''s insulation. In this paper the results of fault current test and high voltage test are presented, discussed and analyzed. [Copyright &y& Elsevier]