... and requirements4.IEC 4/ performance characteristics1, S9-M series power transformer core USES the high quality cold-rolled steel coil, USES the ... beautiful outlook, safety of operation. S9 series S7 series transformer and compared, and the annual average no-load loss is ... , performance level advanced, economical index is reasonable.3. The core of the level 3 juncture when, surface coating cured paint ...