Oil-Immersed Series
Distribution and power transformers built for industrial, utility, and export projects. Stable thermal performance in harsh conditions, from 30 kVA up to 40,000 kVA.
30 kVA – 40,000 kVAMatched Products
105
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Size the required transformer rating (kVA) from total load (kW), operating voltage, line current (Amps), and power factor with adjustable safety reserve.
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Oil-Immersed Transformers · Distribution
1000 kVA primary 60Hz oil-immersed transformer designed for heavy industrial plants, Chancay Megaport logistics zones, and high-altitude mining...
Oil-Immersed Transformers · Distribution
500 kVA primary intake three-phase oil-immersed distribution transformer for high-voltage regional grid distribution, mining auxiliaries, and...
Oil-Immersed Transformers · Distribution
1000 kVA and primary medium-voltage 50Hz oil-immersed step-up distribution transformer. Designed for Atacama solar farms, wind power integration,...
Oil-Immersed Transformers · Power Transformers
This 63 MVA / three-phase oil-immersed power transformer is designed for utility substation, grid interconnection, and large industrial...
Oil-Immersed Transformers · Power Transformers
This 40 MVA / three-phase oil-immersed power transformer is designed for utility substation, grid interconnection, and large industrial...
Oil-Immersed Transformers · Power Transformers
This 20 MVA / three-phase oil-immersed power transformer is designed for utility substation, grid interconnection, and large industrial...
Oil-Immersed Transformers · Power Transformers
This 63 MVA / three-phase oil-immersed power transformer is designed for utility substation, grid interconnection, and large industrial...
Oil-Immersed Transformers · Power Transformers
This 40 MVA / three-phase oil-immersed power transformer is designed for utility substation, grid interconnection, and large industrial...
Oil-Immersed Transformers · Power Transformers
This 25 MVA / three-phase oil-immersed power transformer is designed for utility substation, grid interconnection, and large industrial...
Oil-Immersed Transformers · Power Transformers
This 16 MVA / three-phase oil-immersed power transformer is designed for utility substation, grid interconnection, and large industrial...
Oil-Immersed Transformers · Power Transformers
This 40 MVA / three-phase oil-immersed power transformer is designed for utility substation, grid interconnection, and large industrial...
Oil-Immersed Transformers · Power Transformers
This 31.5 MVA / three-phase oil-immersed power transformer is designed for utility substation, grid interconnection, and large industrial...
XinHuan oil-immersed transformers utilize high-permeability cold-rolled grain-oriented (CRGO) silicon steel cores, electrolytic copper or aluminum conductor windings, and hermetically sealed corrugated tanks to prevent oil oxidation, delivering 30+ years of maintenance-free service.
Corrugated fin radiators flex under thermal expansion, keeping transformer oil completely isolated from atmospheric air and moisture.
Multi-stage 45° step-lap miter joint core minimizes magnetic reluctance and excitation current, exceeding IEC EcoDesign Tier 2 mandates.
High-grade mineral oil or natural ester FR3 with breakdown voltage (BDV) > 50 kV and flashpoint up to 300°C for elevated safety.
Every transformer undergoes full routine testing: winding resistance, ratio, impedance, load/no-load losses, and separate-source AC withstand.
| Series | Capacity | Voltage | Key Benefit |
|---|---|---|---|
| S11 Series | 30–2500 kVA | 11kV, 33kV | Proven baseline reliability |
| S13 Series | 50–3150 kVA | 11kV, 22kV, 33kV | -15% No-load loss vs S11 |
| S20 Series | 100–2500 kVA | 11kV, 33kV | Ultra-low EcoDesign losses |
| Power Series | 10–63 MVA | 33kV to 220kV | Substation OLTC / ONAF |
Factory Facility & Verification
Direct visual proof of XinHuan's manufacturing capability in Hefei, China. Unedited photographs showing our finished distribution transformer workshop, marked finished products area, cast resin dry-type stock, and export container loading.
Real completed units staged in orderly rows, ready for final project inspection, FAT witnessing, and international dispatch.
F/H-class cast resin coils and harmonic mitigation dry-type distribution transformers in stock.
Clear production-stage segregation and routine quality verification for procurement teams prior to container packaging.
Precision silicon steel core stacking, copper coil winding assembly, and tank fabrication.
Heavy-duty vacuum autoclave drying process ensuring zero residual moisture in coil insulation.
Direct container packing and heavy-duty ocean freight loading outside our Hefei facility.
Quality & Compliance
Every transformer, compact substation, and switchgear unit is engineered under audited ISO quality management systems and type-tested according to IEC 60076 and ANSI C57 international standards.
Certified Quality Management System covering design, coil winding, vacuum drying, oil filling, and routine testing of 10kV–35kV distribution transformers.
Environmental Management System certifying low-loss eco-designed core assemblies, zero PCB insulation oil, and environmentally safe production controls.
Occupational Health and Safety Management System ensuring safety containment in high-voltage testing bays and factory assembly protocols.
Complete routine and type test records (temperature rise, impulse voltage withstand, short-circuit withstand) conducted at CNAS-accredited national research institutes.
On-site factory audit certificate by SGS / Made-in-China, verifying manufacturing premises, export capacity, assembly lines, and legal qualification.
Verified annual supply performance and delivery certificate for overseas power grid EPC and industrial infrastructure projects (Mozambique, Nigeria, Kenya, SEA).
FACTORY & TESTING WALKTHROUGHS
Factory tours, high-voltage routine test procedures, and production walkthroughs straight from our Hefei manufacturing base.
Hefei manufacturing base, automated workshops, and high-voltage testing laboratory.
100% IEC 60076 voltage ratio, winding resistance, and dielectric routine testing.
Epoxy resin vacuum casting, partial discharge testing, and temperature monitoring.
Precision copper winding, silicon steel core stacking, and vacuum drying chambers.
Automated coil winding, precision core stacking, and vacuum drying chambers.
Vacuum circuit breakers, copper busbar routing, and relay protection cabinets.
Prefabricated kiosk substation panel wiring, RMU integration, and LV distribution.
Copper foil winding, vacuum resin casting molds, and core-coil assembly.
Engineering Reference Silo
