15kV Transformer,Industrial Frequency Transformer,IEC Transformer 1.3Ph,15kV/0.4kV 2.30kVA~20MVA 3.IEC,ISO 4.Top 10 in China 20kV Series Transformer, Industrial Frequency Transformer, IEC TransformerService conditions 1) Altitude: ≤1, 000m 2) Maximal ambient temperature: +40.C3) Maximal daily average temperature: +30.C4) Maximal annual average temperature: +20.C5) Minimal ambient temperature: -25 ...