Looking for top-tier power transformers manufacturers?
Our 35kV high voltage power transformer features advanced OLTC technology, low loss, and low noise design.
Complying with IEC and GB standards, it's the ideal large power transformer for substations. Discover how does power transformer work with our maintenance-free, vacuum-dried units.
Key Features & Advantages
Why Choose Our High Voltage Power Transformer?
As a leading large power transformer in the industry, our 35kV oil-immersed series is engineered for stability and longevity.
• Advanced OLTC Technology
Equipped with an On-Load Tap Changer (10±4×2.5%kV or 35±3×2.5%kV), allowing for manual or automatic voltage adjustment without power interruption.
• Superior Core Design
Utilizing high-permeability, grain-oriented cold-rolled silicon steel with multi-step lap joints to drastically reduce no-load loss and noise.
• High-Purity Oxygen-Free Copper
Our windings use premium copper and scientific transposition to minimize load loss and enhance electrical conductivity.
• Robust Short-Circuit Resistance
High-strength insulation cylinders and pre-densified spacers ensure the unit withstands extreme mechanical stress.
• Low Partial Discharge
Strategic use of angle rings and rounded edges on all metal parts eliminates field concentration, ensuring a high voltage power transformer that lasts.
• Innovative Cooling & Sealing
Axial oil passages improve heat dissipation, while high-grade acrylate gaskets prevent leakage for long-term outdoor operation.
Specifications & Parameters
Understanding the Technology
To understand what is power transformer and what does a power transformer do, it is essential to look at the technical architecture that enables efficient power distribution.
| Category | Specification / Description |
| Model Type | S11 / S13-800 to 31500 / 35 |
| Rated Voltage | 35kV Class (up to 110kV available in series) |
| Tap Changing | On-Load Tap Changer (OLTC): ±3x2.5% (35kV) |
| Standards | IEC 60076, GB 1094, GB/T 6451 |
| Core & Coil Assembly | Triple-point rigid positioning with anti-vibration design. |
| Cooling Method | ONAN (Oil Natural Air Natural) |
| Protection Devices | Gas Relay, Pressure Relief Valve, Signal Thermometer |
Key Performance Data (Example for 35kV Series)
The table below illustrates the tiered efficiency levels for the 35kV series. Please contact us for the complete datasheet covering all voltage classes and ratings.
35kV Oil-Immersed Three-Phase On-Load Tap-Changing Power Transformer Loss Table
| Rated Capacity (kVA) | Efficiency Level 1 |
Efficiency Level 2 |
Efficiency Level 3 |
short-circuit impedance% |
|||
| No-Load Loss (kW) | Load Loss @75°C (kW) | No-Load Loss (kW) | Load Loss @75°C (kW) | No-Load Loss (kW) | Load Loss @75°C (kW) | ||
| 3150 | 1.8 | 22.2 | 2.1 | 22.2 | 2.6 | 23.5 | 7 |
| 4000 | 2.1 |
26.2 | 2.5 | 26.2 | 3.1 | 27.6 | 7 |
| 5000 | 2.6 | 30.8 | 3.0 | 30.8 | 3.7 | 32.5 | 7 |
| ... | ... | ... | ... | ... | ... | ... | |
| 31500 | 12.0 | 104.4 | 14.2 | 104.4 | 17.4 | 110.2 | 10 |
Common Questions
How Does Power Transformer Work?
A power transformer works on the principle of electromagnetic induction. It transfers electrical energy between two or more circuits through a magnetic field, primarily used to step up or step down voltages to minimize energy loss during long-distance transmission.
What Does a Power Transformer Do in a Substation?
The primary role of a large power transformer is to regulate voltage levels.
In 35kV systems, our units ensure that the output voltage remains stable despite input fluctuations, protecting downstream industrial equipment.
Packaging, Warranty & Certifications Packaging：
Our products are shipped using heavy-duty reinforced steel or wooden frames compliant with international shipping standards to prevent vibration damage.
Warranty：
We offer a standard 12-18 months warranty and a 30-year design life. As trusted power transformers manufacturers, we provide 24/7 technical support.
Quality Certifications：
Fully certified under ISO 9001, CE, CSA and KEMA protocols. Each unit undergoes rigorous routine, type, and special tests before dispatch.
Testing：
Every transformer undergoes comprehensive routine tests, including but not limited to turns ratio, winding resistance, impedance voltage, no-load & load loss measurement, and dielectric withstand tests. Type tests and special tests (e.g., temperature rise, short-circuit withstand) are conducted as required.
