Cheap High-Efficiency Stacked Core Transformer from China Factory - Reliable Energy Solutions by Top Suppliers Manufacturer, Suppliers

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Introducing our China-manufactured stacked core transformer, crafted with a premium laminated structure using high-grade grain-oriented silicon steel sheets. This design significantly reduces eddy current and hysteresis losses, achieving an impressive energy efficiency of up to 98%. Our transformer features advanced heat dissipation capabilities, ensuring stable operation in a wide temperature range of -20°C to 60°C. Its compact design allows for flexible installation in various settings. With customizable options ranging from 110V to 33kV and 5kVA to 5MVA, as well as IP ratings from IP23 to IP65, it is ideal for industrial, renewable energy, and commercial applications. Manufactured in our state-of-the-art factory, this transformer meets IEC/ANSI standards, guaranteeing durability for over 25 years and operating at low noise levels of less than 55dB. As one of the leading suppliers, we are committed to providing high-quality solutions for your energy needs.

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Product Description

Product Specification

Basic Information
Item Specification
Product Model Example: S13-M-100/10 (S=Three-Phase, 13=Efficiency Class, M=Hermetically Sealed, 100=Rated Capacity kVA, 10=HV Rated Voltage kV)
Rated Capacity(Sn) 50kVA~2500kVA (ONAN: 100% rated capacity; ODAF: 130% rated capacity)
Phase Three-Phase (Standard) / Single-Phase (Customizable)
Rated Frequency(fn) 50Hz / 60Hz (±1% tolerance)
Connection Group Dyn11 (Default) / Yyn0 (Optional, per IEC 60076-1)
Environmental & Operating Conditions
Ambient Temperature -25℃~40℃ (-40℃ optional with anti-freeze additive)
Altitude ≤1000m (5% derating at 1500m, 10% at 3000m)
Humidity ≤90% @25℃ (no condensation); ≤50% @40℃
Seismic Resistance GB 50260-2013, 7-degree intensity (0.15g acceleration)
Protection Class IP20 (Indoor) / IP23 (Outdoor, dust/rain protection)
Losses & Impedance (Efficiency Core)
Parameter S13-100/10 Example Test Conditions
No-Load Loss (Po) ≤170W Rated voltage, rated frequency
Load Loss (Pk) ≤1050W Rated current, 75℃ reference temp
Short-Circuit Impedance (Uk%) 4%~6% ±10% tolerance at 75℃
No-Load Current (Io%) ≤1.2% (≤0.8% for large capacity) Rated voltage
Efficiency Compliance: GB 20052-2024 Class 2 (S13) / Class 1 (S15, 15-20% lower losses than S13) — IEC 60076-11 IE2/IE3 equivalent for EU markets
Example S13-250/10 Key Specs
Item Value
Rated Capacity 250kVA
HV/LV Voltage/Current 10kV/14.43A;0.4kV/360.8A
No-Load/Load Loss ≤320W / ≤2250W
Short-Circuit Impedance 4.5%
Core Material 30Q130 Silicon Steel
Cooling Method ONAN
Protection Class IP23

Customization available for special voltages, high-altitude, or explosion-proof requirements. All parameters verified by third-party labs.

Advantages

  • Superior Energy Efficiency Laminated structure with high-grade grain-oriented silicon steel minimizes eddy current and hysteresis losses, achieving up to 98% efficiency—cuts energy consumption and operational costs long-term.
  • 🌡️
    Strong Thermal Stability Advanced heat-dissipating design enables reliable work in -20°C to 60°C, avoiding overheating issues.
  • 🔧
    High Customizability Flexible voltage (110V-33kV), capacity (5kVA-5MVA), and enclosure (IP23-IP65) options fit industrial, renewable energy, and commercial needs.
  • 🛡️
    Durable & Low-Noise Compliant with IEC/ANSI standards, it has a 25+ year lifespan and <55dB noise, ensuring long-term stable, quiet operation.

Product Display

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Application

🏭 Industrial Sector

Powers heavy machinery (e.g., manufacturing assembly lines, metal processing equipment), industrial control systems, and factory power distribution networks—handles fluctuating loads stably to ensure uninterrupted production.

☀️ Renewable Energy Systems

Integrates with solar photovoltaic (PV) farms and wind power plants, converting unstable renewable energy into grid-compatible electricity for efficient power transmission to the public grid.

🏢 Commercial & Residential Areas

Supplies power to commercial buildings (shopping malls, office towers) and residential communities, supporting HVAC systems, lighting, and household/appliance electrical needs with low noise and high efficiency.

🔌 Power Transmission & Distribution

Used in medium/high-voltage power grids (e.g., regional substations), stepping up/down voltages to match long-distance transmission and end-user demand, ensuring safe and efficient power supply.

Frequently Asked Questions

Q What is the difference between S13 and S15 oil-immersed transformers?
The S13 transformer meets GB 20052-2024 Class 2 efficiency standards, while the S15 meets Class 1 — achieving 15–20% lower no-load and load losses than S13. S15 is ideal for applications requiring maximum energy savings and reduced operating costs over the long term.
Q Can the transformer be customized for high-altitude or extreme temperature environments?
Yes. The transformer supports derating options for altitudes above 1000m (5% at 1500m, 10% at 3000m), and can be configured with anti-freeze additives for operation down to -40℃. Explosion-proof enclosures and special voltage configurations are also available upon request.
Q What cooling methods are supported?
The standard cooling method is ONAN (Oil Natural Air Natural), which supports 100% of rated capacity. ODAF (Oil Directed Air Forced) cooling is also available, allowing operation at up to 130% of rated capacity for higher-demand applications.
Q What international standards does this transformer comply with?
The transformer complies with GB 20052-2024 (China national efficiency standard), IEC 60076-1 (general requirements), and IEC 60076-11, which is equivalent to IE2/IE3 efficiency classes for European Union markets. All parameters are verified by third-party testing laboratories.
Q Is this transformer suitable for solar and wind energy applications?
Absolutely. The transformer is designed to integrate with solar PV farms and wind power plants, converting variable renewable energy output into stable, grid-compatible electricity. Its high efficiency and thermal stability make it well-suited for continuous outdoor renewable energy operation.
Q What is the expected service life and noise level of this transformer?
This transformer is built to IEC/ANSI standards with a design lifespan of 25+ years. The operating noise level is less than 55dB, making it suitable for installation near residential communities, commercial buildings, and noise-sensitive environments.

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