In the competitive power transformer market, our 35kV oil-immersed 3 phase power transformer (also known as three phase power transformer) delivers exceptional performance and reliability.
As a premium types of power transformer, this industrial power transformers series is engineered for medium-voltage substations and heavy-duty applications.
With advanced low-loss design, strong short-circuit resistance, and IEC-compliant quality, we provide dependable power transformer supply and ready-to-ship power transformer for sale solutions tailored to your 50/60 Hz, 35 kV power system needs. Capacities range from 800 kVA to 31,500 kVA – the ideal choice for energy-efficient, maintenance-friendly operation.
Key Features & Advantages
Our 35kV oil-immersed three phase power transformer incorporates cutting-edge technology from global leaders while strictly following IEC 60076 and Chinese national standards (GB/T 6451). Key advantages include:
• Low Loss & Low Noise
High-permeability grain-oriented cold-rolled silicon steel core with full mitered multi-step joints and precision shearing drastically reduces no-load losses, no-load current, and operating noise. High-purity oxygen-free copper windings with optimized transposition and lead arrangement minimize load losses for superior efficiency.
• Strong Short-Circuit Resistance
Precise ampere-turn balance between HV and LV windings, high-strength insulation cylinders, locking struts, and pre-densified spacers ensure outstanding mechanical strength. Constant-pressure vacuum drying guarantees uniform coil compression with minimal rebound.
• Low Partial Discharge
Strategic placement of angle rings, rounded edges, deburring, and smooth shielding on all joints and metal parts effectively control electric-field concentration and keep partial discharge at industry-leading low levels.
• Low Temperature Rise
Advanced axial clamping, new-style fasteners, and reinforced design withstand transport shocks, eliminating the need for frequent core lifting and saving time and cost.
• Core-Free Maintenance
Advanced axial clamping, new-style fasteners, and reinforced design withstand transport shocks, eliminating the need for frequent core lifting and saving time and cost.
Additional structural highlights:
Heart-type laminated core with multi-step round columns and equal-section yokes.
Concentric windings with on-load tap changer (manual/auto) mounted on the cover.
Comprehensive safety devices: gas relay, pressure relief valve, conservator with oil-level gauge, and sealed breather.
Outdoor signal thermometer (≥1000 kVA) and convenient oil sampling/drain valves.
Specifications & Parameters
As essential transformers for power plants, our units are built to the following technical benchmarks:
| Category | Specification / Description |
| Rated Capacity | 800 kVA – 31,500 kVA |
| Rated Voltage (HV) | 35 kV (or customized) |
| Rated Voltage (LV) | 6.3 kV / 6.6 kV / 10.5 kV / 11 kV (customizable) |
| Frequency | 50 Hz / 60 Hz |
| Connection Group | Dyn11, YNd11, or per customer requirement |
| Short-Circuit Impedance | 6.5% – 8.0% |
| Cooling Method | ONAN / ONAF (oil natural / forced air) |
| No-Load & Load Losses | Low-loss design per IEC 60076 / GB standards |
| Temperature Rise | Oil ≤ 60 K, Winding ≤ 65 K |
| Ambient Temperature | -25°C to +40°C |
| Tap Change | On-load (OLTC) with ±2×2.5% or ±5% range |
| All models meet or exceed IEC 60076, GB 1094, and GB/T 6451 requirements. | |
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：
Robust export-grade wooden crates or containerized sea/land transport packaging with shock-proof fixing and moisture-proof measures. Fully complies with international shipping standards.
Warranty：
12 months from commissioning or 18 months from delivery (whichever comes first), with lifetime technical support.
Quality Certifications：
IEC 60076, GB/T 6451, ISO 9001, ISO 14001, and CSA (as client's requirements).
Testing：
Full type-test and routine-test reports provided.
Ready for immediate power transformer supply?
Contact us today to secure your power transformer for sale – the reliable, energy-saving industrial power transformers solution trusted across the global power transformer market.
Whether you need standard or custom types of power transformer, our 35kV 3 phase power transformer delivers unmatched performance and value.
