20 MVA PowerTransformer Exported for Ecuador

The 25MVA (25,000kVA) three-phase power transformer is a medium-to-large oil-immersed main power transformer, widely applied in regional substations, large industrial and mining enterprises, new energy power stations and data centers for high-voltage power transmission & voltage reduction as well as centralized power supply for regional power grids.
Common model designations: SZ11/SZ13-25000 (on-load tap changer) and S11/S13-25000 (off-circuit tap changer).
Applicable standards: GB 1094, IEC 60076, IEEE C57.
1. Core Basic Parameters
1.1 Rated Specifications
Rated Capacity: 25MVA (25,000kVA), 3-phase, 50Hz (60Hz available for overseas customized orders)
Common High Voltage (HV) Side Ratings: 35kV, 66kV, 110kV, 132kV, 220kV
Common Low Voltage (LV) Side Ratings: 6.6kV, 10.5kV, 11kV, 22kV
Standard Vector Group: Dyn11 (most widely used), Yyn0
Typical Short-circuit Impedance: 6%, 8%, 10.5% (10.5% is standard for 110kV voltage class)
Tap Regulation Mode:
S: Off-circuit Tap Changer (voltage adjusted during power cut, 5 taps at ±2×2.5%)
SZ: On-load Tap Changer (OLTC, automatic voltage regulation under load to adapt to fluctuating loads)
Cooling Method:
ONAN (Oil Natural Air Natural): Rated capacity 25MVA
ONAF (Oil Natural Air Forced): Capacity can be upgraded to 30MVA with cooling fans for heavy-load working conditions

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Power Transformer ecuador

PRODUCT CATEGORY

Product Description

Core Power Conversion Function

Realize bidirectional voltage step-up or step-down between high voltage and low voltage, transmit electric energy efficiently, match voltage levels of power transmission network and user power consumption system, guarantee normal power supply of power grid and industrial loads.

Voltage Regulation & Stable Power Supply

Off-circuit tap changer: 5 tapping positions at ±2×2.5%, adjust voltage ratio when power is cut off to adapt to seasonal grid voltage deviation.
On-load tap changer (SZ type): Realize automatic voltage adjustment under live load, dynamically stabilize output voltage within allowable range, effectively avoid equipment damage caused by overvoltage or undervoltage under fluctuating loads.

Efficient Energy Saving & Low Operating Consumption

Adopts high-grade amorphous/cold-rolled grain-oriented silicon steel core and tightly wound copper coils, greatly reduces no-load loss and load loss. S13 high-efficiency model meets international secondary energy efficiency standard, cuts long-term operation power consumption and reduces user electricity cost.