China 10mva 66kv Double-Winding Power Transformers with off-Circuit Tap Changer Tansformer

Technical parameters:
ONAN/onAF Primary (HV) Rated Power/ (): MVA10
ONAN/onAF Secondary (LV) Rated Power: / ()MVA6/8
Altitude of Installation: >= 3000 m. A. S. L.
Number of Phases: 3
Rated Frecuency: Hz50
Type of Service: Outdoor - Continuous Service
Rated Primary (HV) Voltage: ()V69000
OFF CIRCUIT Primary Tapping Range: % Un± 2 x 2, 5%
Rated Secondary (LV) Voltage: ()V25000
OFF CIRCUIT SecondaryTapping Range: % Un/
Insulating Liquid: Mineral Transformer Oil - NO PCB
Connection Symbol: YNd11
Connections: Primary: WYE with Neutral brought out
Secondary: WYE with Neutral brought out

Reference Temperature ° C75No-Load Losses at Principal Tapping:W9.0 kWLooses of Cooling Fan SystemW/Insulation Levels (LI/AC): LI325AC140/LI125AC55No Load Current:@ Un% In0.56@ 1.05 Un% In0.68Sound Level: dB< 67Short Circuit Impedance at Principal Tapping:P/S% Un8~10%P/T% Un S/T% Un Reference Temperature ° C75Top Oil Temperature Rise:°C51KAverage Winding Temperature Rise: °C64KInsulation Resistance (Reference Temperature = 20°C):HV/LV /Mohms ≥1000HV/GR - LV/GR -Mohms≥1000

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