... Transformer(BK,SBK),power transformer,electric transformer,JBK Machine Tool Control Transformer, Transformer,BKC,JBKDG & SGPower Transformer,Dry type transformer,Three-phase Dry-type Power Transformer,Transformer,SG,DG DG and SG series Dry type ... 8.Insulation resistance: ≥50MΩ 9.Electric strength: no breakdown or flashover phenomenon under power frequency sine voltage of 2000V for ...