The Performance of a 3000/6000V, 1000kVA Class Superconducting Transformer Developed for a Prospective Power Transmission Model System Integrated under Superconducting Environment (PROMISE)

Abstract

A 3000/6000V, 1000kVA class superconducting transformer (SC-Tr) was developed for a Prospective Power Transmission Model System Integrated under Superconducting Environment (PROMISE). In this transformer, the core is immersed in liquid helium together with superconducting windings, and the major insulation is provided by the liquid helium. This paper describes the design feature and measured characteristics of the SC-Tr. Fundamental characteristics of the SC-Tr are obtained through no-load, short-circuit tests and quench experiments. The results of the no-load test have verified that the SC-Tr has the capability to withstand a.c. voltage of 3000/6000V of 60Hz without any partial discharge. The short-circuit tests have proved that the SC-Tr is capable of carrying a.c. current of 170Arms without quench in the superconducting windings. Furthermore, in a real-load experiment with the PROMISE, electric power of 3800V-460kVA of 50Hz in high-voltage side is transmitted through this SC-Tr.