1.Oil immersed type power distribution transformer 2.S9-M 1600kva 22/0.4KV 3.5 Years Quality assurance period 4 ... and requirements4. GB1094.1 ~ 2-1996 power transformer4/ performance characteristics1, S9-M series power transformer core USES the high quality cold ... anaerobic copper into and beautiful outlook, safety of operation. S9 series S7 series transformer and compared, and the annual average ...