Transport current loss of BSCCO/Ag tape in different orientations of the external alternating magnetic field

BSCCO/Ag tapes are being developed for electrical power applications at liq uid nitrogen temperatures. In these applications, conductors are exposed to an alternating magnetic field and fed simultaneously with an alternating t ransport current, In this contribution the influence of an external alterna ting magnetic field on the transport current loss of a single tape is studi ed experimentally. Special attention is paid to the loss as a function of t he orientation of the external magnetic field. The transport current loss i n a DC external magnetic field can be described well by the decrease of the critical current due to the magnetic field. In the case of an AC external magnetic field this is only a minor effect. Effects responsible for the inc rease of the transport current loss in external AC magnetic field are inves tigated with respect to their angle dependency. A model based on a 1 dimens ional meddling of the conductor and an average critical current density dur ing the magnetic field cycle is presented. This model describes the measure d results reasonably well below the critical current.