High-Efficiency Substation Solutions
Discover our premium 35kV oil-immersed off-circuit tap changing power transformers. Engineered for reliability, these high power transformers feature low loss, low noise, and superior short-circuit resistance.
Designed for substation power transformers and power grid transformer applications, our products meet IEC and GB standards, ensuring stable performance in extreme environments.
Key Features & Advantages
Our 35kV series represents the pinnacle of hv power transformers technology, blending advanced manufacturing with high-grade materials.
• Ultra-Low Loss & Noise
Utilizing high-permeability grain-oriented cold-rolled silicon steel with multi-step lap joints, we've significantly reduced no-load current and acoustic levels.
• Superior Short-Circuit Withstand
High-purity oxygen-free copper windings and pre-densified insulation components ensure the large power transformers can handle electrical stresses with ease.
• Advanced Thermal Management
Integrated axial oil cooling channels and flow-guiding partitions enhance heat dissipation, ensuring a low temperature rise even under heavy loads.
• Maintenance-Free Design (Core-Stay)
Our unique axial compression and anti-vibration fastening mean no internal core inspection is required before installation, saving time and costs for big power transformers.
• Secure Sealing
The tank is constructed from high-quality steel with the latest acrylate gaskets to prevent oil leakage and ensure long-term aging resistance.
Specifications & Parameters
As essential transformers for power plants, our units are built to the following technical benchmarks:
| Category | Specification / Description |
| Rated Voltage | 35kV (Primary) |
| Frequency | 50Hz / 60Hz |
| Tap Range | ±2×2.5% or ±5% (Off-circuit manual/automatic) |
| Standard Compliance | 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) |
| Capacity Range | 800kVA to 31500kVA |
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 Non-Excitation Voltage Regulating 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 | 1.7 | 20.7 | 2.0 | 20.7 | 2.4 | 21.9 | 7 |
| 4000 | 2.0 |
24.6 | 2.3 | 24.6 | 2.9 | 25.9 | 7 |
| 5000 | 2.4 | 28.2 | 2.8 | 28.2 | 3.5 | 29.7 | 7 |
| ... | ... | ... | ... | ... | ... | ... | |
| 31500 | 11.1 | 100.8 | 13.1 | 100.8 | 16.2 | 106.4 | 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：
We understand that large power transformers require specialized handling.Seaworthy steel/wooden base frames, vacuum-sealed oil tanks, and moisture-proof wrapping.
Shock-absorbing measures ensure the unit arrives "ready-to-install" without internal shifting.
Warranty：
12-month standard warranty from the date of commissioning or 18 months from delivery.24/7 technical consultation and remote guidance for installation.
Quality Certifications：
Our factory and products are certified by international bodies to guarantee quality for your power grid transformer projects:
ISO 9001:2015 Quality Management System.
CE & KEMA (Optional) Type Test Reports.
Testing：
Full Routine Tests (Ratio, Resistance, Dielectric, etc.) provided with every shipment.
