1G versus 2G-comparison from the practical standpoint for HTS power cables use

Abstract

Two types of HTS conductors are currently available or coming to the worldwide market for use to make different HTS devices. They are known as first generation 1G HTS (usually Bi-2223 systems made with "powder-in-tube" methods) and second generation 2G HTS (coated conductors, usually made on the base of YBCO superconductor). HTS transmission and distribution power cables have been under development for several years worldwide and show strong technical and economic value. Several large projects are underway with lengths of HTS cables varying from 30-100 m up to 650 m. Many of these projects are being conducted in real grid conditions. Recently a transition from using 1G to 2G wire has started for these cable applications and future projects are expected to fully transition to the 2G wire. The question is whether 2G wire has all advantages over its predecessor. In this paper we will compare 1G and 2G HTS tapes for their practical use in HTS power cables. Parameters such as critical current anisotropy, mechanical properties, and resistance to the thermo-cycling have been measured. The results will provide valuable data to observe the benefits of each wire type for HTS power cable applications.