Development of 66 kV/6.9 kV 2 MV A prototype HTS power transformer

Abstract

We have developed the technology of the producing a HTS magnet for the power transformer. Three subjects have been mainly studied, high voltage technologies, large current and low AC loss technologies and sub-cooling system technologies to establish the technology of 66kV/6.9kV 10MVA class HTS power transformer.In order to verify the validity of elemental technologies, such as high voltage technologies, large current and low AC loss technologies and sub-cooling system technologies, single-phase 2MVA class 66kV/6.9kV prototype HTS transformer was manufactured and tested. In the load loss (AC loss) measurement, it was obtained that the measured value of 633W was almost corresponding to the calculated value of 576W at the rated operation of 2MVA. Moreover, the breakdown was not found all voltage withstand test. These test results indicate that elemental technologies were established for the development of 66kV/6.9kV 10MVA class HTS power transformer.