2025-07-18
The data sheet for the 1250 kVA transformer includes detailed technical specifications on the weight and price of the transformer. The actual data sheet may vary depending on the manufacturer. Below is a brief overview of the key parts and common parameters. If you need a 1250 kVA transformer, please contact our company.
1.Rated Power: 1250 kVA (Kilovolt-Amperes). This is the apparent power output the transformer is designed to deliver continuously at rated conditions.
2.Vector Group / Connection Symbol: Describes the phase relationship between windings (e.g., Dyn11, Dyn5, YNd1, Yyn0). Crucial for parallel operation and grounding.
3.Cooling Class: How heat is dissipated. Common types:
ONAN: Oil Natural / Air Natural (Radiators)
ONAF: Oil Natural / Air Forced (Fans on radiators)
OFAN: Oil Forced / Air Natural (Oil pump + radiators)
OFAF: Oil Forced / Air Forced (Oil pump + fans)
4.Insulation Level: Specifies the dielectric strength (e.g., LI 75kV AC 28kV - Lightning Impulse 75kV, Power Frequency 28kV for HV side).
5.Impedance Voltage (%Z): Typically between 4.5% and 8% for distribution transformers (1250kVA is often in this range). Critical for short-circuit current calculation and voltage regulation.
6.No-Load Loss (P0): Power loss when energized but unloaded (core loss). Measured in Watts (W) or Kilowatts (kW). Lower = more efficient at light load.
7.Load Loss (Pk): Power loss due to load current (copper loss) at rated current and reference temperature (usually 75°C or 85°C). Measured in Watts (W) or Kilowatts (kW). Lower = more efficient at full load.
8.Total Loss (Pt): P0 + Pk.
9.Efficiency: (Output Power / (Output Power + Total Losses)) * 100%. Often specified at 50% and 100% load.
1.Voltage Regulation: The change in secondary voltage from no-load to full-load (expressed as a %). Depends on %Z and load power factor.
2.Temperature Rise: Maximum allowable average winding temperature rise over ambient (e.g., 55K or 60K for oil). Ambient is usually defined (e.g., 40°C).
3.Tapping Range: +/- 2.5%, +/- 5% (common), sometimes more. Allows adjustment of output voltage.
4.Sound Level (LpA): Guaranteed maximum noise level in dB(A) at rated voltage and frequency under no-load conditions. Common range: 50 dB(A) to 65 dB(A) depending on design/cooling.
5.Neutral Current Rating (for LV side): Especially important for Dyn11 transformers supplying unbalanced loads.
SCB10 siza：1480mm*1170mm*945mm
SCB10 weight：2960kg
Type of Transformer
Dry-Type (Cast Resin or VPI): Generally more expensive than oil-filled (often 20-50%+ premium). Prices range roughly $25,000 to $80,000+ USD.
Liquid-Filled (Mineral Oil or Ester Fluid): Generally less expensive. Prices range roughly $15,000 to $60,000+ USD.
