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.
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.
They are engineered for stable, long-term performance in power grids, industrial facilities, and renewable energy projects. Built with a durable light-gray steel tank, high-grade silicon steel core, and copper windings, this unit features an integrated conservator tank, oil-immersed bushings, and corrosion-resistant components for reliable operation.
Designed with eco-friendly, recyclable materials, it meets IEC and GB standards, with a low-maintenance design that simplifies routine checks and reduces downtime. Customizable power ratings, tap configurations, and mounting solutions are available to match your project needs, backed by personalized engineering support and clear maintenance guidelines.
As a leading manufacturer, we deliver certified 35kV oil-immersed transformers with rigorous factory testing, competitive pricing, and flexible lead times. Backed by global after-sales support and tailored solutions, we help you optimize power efficiency while keeping costs under control.
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.
