Surface flashover characteristics in liquid nitrogen for application of superconducting pancake coils Original Research Article

For the development of superconducting power apparatus, it is necessary to establish the dielectric technology in coolants like LN2. Among the dielectric technology, surface flashover characteristics are studied with several simplified spacers at the structural aspects. Double pancake coil can apply to transformer and fault current limiter, etc. To design dielectric system of high temperature superconducting transformer consisting of double pancake coils, this study discusses an effective insulator composition. Circular shape insulator divided into two parts should be inserted between coils and the insulator should cover electric stresses concentrated at the circumference of the coils which are in the same section of double pancake coils facing each other.