Step Up and Down Transformer,Up Down Transformer 1.3Ph,10~35kV/0.4~10kV 2.30kVA~20MVA 3.S9~S13 class optional Step Up and Down Transformer, Up Down TransformerService ... circuit5.Hermetic radiator oil tank, reduced volume and prolonged service life6.Special securing structure, no ... drifting during shipping and sustained operation7.Security: pressure relief valve, signal ...