Reliable Oil Immersed Transformers for Industrial & Utility Applications
Engineered for industrial facilities, utility networks, and renewable energy projects. Our oil immersed transformers deliver dependable performance, flexible configurations, and customized solutions for diverse power distribution needs.
Oil Immersed Transformer
The oil immersed transformer features a wide capacity coverage, with production available for high voltage grades from 30 kV to 2500 kV. Capacity expansion retrofits can be implemented at a later stage by replacing windings and optimizing the heat dissipation system, delivering high residual value utilization for the equipment.
Smart Tap Changer
Advanced Cooling System
What is an oil immersed transformer and why does it matter?
An oil‑immersed transformer, in simple terms, is electrical power equipment whose core components, namely the iron core and windings, are immersed in special insulating oil. The insulating oil fulfils two core functions: insulation and heat dissipation.
It plays a pivotal role because its excellent performance and high reliability make it the fundamental unit for voltage transformation as well as power transmission and distribution in the entire power system. Modern‑day power supply systems would not function efficiently without it.
High Dielectric Strength
Stable & Reliable Power
Core Components of an Oil Immersed Transformer
Every oil immersed transformer is built from the same fundamental building blocks. Differences between a 100 kVA distribution unit and a 250 MVA transmission transformer are matters of scale, not architecture.
The core is typically built from grain-oriented silicon steel laminations, with premium S20 designs substituting amorphous metal ribbon to reduce excitation losses by roughly 30%.
Windings use copper as the default conductor, organized as concentric cylinders and mechanically braced to withstand short-circuit forces.
Magnetic Core
Grain-oriented silicon steel or amorphous metal ribbon to minimize hysteresis and eddy-current losses.
Windings
Copper conductors in concentric cylinders, mechanically braced for short-circuit forces.
Insulating Oil
Mineral oil, natural ester (FR3), synthetic ester, or silicone oil for insulation and heat removal.
Our Comprehensive Oil Immersed Transformer Lineup
S20 series two-level energy efficiency oil-immersed ransformers
The S20 oil-immersed transformers meet China’s Grade 2 energy efficiency standard, offering lower losses, optimized materials, reduced operating costs, and reliable long-term performance.
- GB 20052 Grade 2 compliant
- Low No-Load & Load Losses
- 60K Temperature Rise
S22 type oil-immersed transformer
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S13 series of Three-phase oil Immersed Transformers
Specifying an Oil Immersed Transformer
kVA Rating & Headroom
Size to peak demand with 25–30% margin for load growth and harmonic derating.
Voltage Class & Vector Group
Match upstream grid and downstream load; Dyn11 is the distribution default.
Impedance & Cooling
4% for utility distribution, 6% general default; ONAN baseline with ONAF dual-rating option.
Tap Changer Configuration
Off-circuit ±5% for distribution; OLTC where grid voltage drifts outside ±5%.
