The transformer type superconducting fault current limiter, which is made up of a series transformer and a superconducting current limiting device, has many advantages such as the design flexibility of the current limiting device. However, the design strategy for determining the superconducting current limiting device ratings and the transformer ratings is unclear because the relations between the current limiting characteristics and these ratings are not analyzed enough.In this paper, the relations between the current limiting characteristics and these ratings are analyzed theoretically. The experimental results of the transformer type superconducting fault current limiter are also shown.

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In recent years ， the speed up of ship is advanced in the worl 虞． Also， in Japan ， the way of the transport is to be sh 遶 ed 翫o 阻 laud transport to seaway ． There 丘)re ， the tequire 皿 ent of high ・ speed vessels 瓢 th high − speed ， high power denSity ， hghtweight and high ・ e 雌 cient eng 真 ne is increas 血 g ． To cope with this re 騨 irement， Niigata V16FX high ・ speed diesel enghle wa8 developed a混 d dehvered丘)r high ・ speed vessels ， passenger ship 鬘， pa 貸 ol boaも s and so on since 1992 ， Aiming to satisfy higher output demands， V20FX has been develope δ using the expehence of preceding V16FX a 烈 d the state ofthe art ． V20FX wa8 developed as the engine with the lightweight ， compactness ， high durability and high reliability ． This engi ロ e has simple structure with s 血 gle stage turbo ・ chargi 皿 g system by high per ｛ bmlance turbochargers ach ま eving me ' 4n effective pressure 2 ． 5MPa ， mean piston 8peed l2． 1m ！ s ， power rate 30 ． 3MPa ／ " mts and maximum output 250kW ／ cyl at 1650min ' i ． Key Words ：High Speed Diesel Engines， High Spee 己 Vb8sels ， Modal Sif毛