11/33kV Oil-immersed Distribution Transformer
Custom designed for utility, industrial and renewable energy distribution projects. ONAN/ONAF cooling, with or without OLTC, built to IEC 60076 / IEEE C57 standards.
Technical Parameters
Standard parameter ranges for this model. Special requirements can be assessed by our engineering team — contact us for custom specifications.
| Parameter | Standard Range |
|---|---|
| Rated capacity | 50–2500 kVA (standard: 50, 100, 200, 315, 500, 630, 800, 1000, 1250, 1600, 2000, 2500) |
| Primary voltage | 6, 10, 11, 20, 22, 33, 35 kV |
| Secondary voltage | 0.4 kV (400V) — custom available |
| Frequency | 50 Hz or 60 Hz |
| Phase | 3-phase |
| Vector group | Dyn11, Dyn1, Yyn0 (Dyn11 standard) |
| Impedance | 4.0% – 6.0% (per IEC 60076-5; special impedance assessed) |
| Cooling method | ONAN (standard); ONAF (optional for higher rating) |
| Tap changer | Off-circuit (OCTC) ±2×2.5%; On-load (OLTC) optional |
| Insulation level | LI75AC35 / LI95AC50 (per voltage class) |
| Temperature rise | 65K (oil); 65K (winding, F class) |
| No-load loss | Per IEC 60076-1 / GB/T 6451 (S11/S13 levels available) |
| Load loss | Per IEC 60076-1 / GB/T 6451 |
| Noise level | ≤55 dB (typical, per IEC 60076-10) |
| Protection level | IP20 (indoor); IP44/IP54 (outdoor, optional) |
| Applicable standards | IEC 60076, IEEE C57.12.00, GB/T 6451 |
| Ambient temperature | -25°C to +40°C (higher temp with derating) |
| Altitude | ≤1000m (derating above, up to 4000m) |
| Accessories | Buchholz relay, oil/winding temp gauge, pressure relief, breather, rollers, tap changer |
Product Advantages
Verifiable benefits — not empty claims. Here’s exactly what you get when you choose JINXING.
Full Routine Testing
Every unit tested per IEC 60076-1: insulation resistance, winding resistance, voltage ratio, no-load/load loss, power frequency withstand.
48-Hour Quote Response
Standard products quoted in 48 hours. Custom designs assessed in 3–5 working days.
Environment-Ready
Designed for -25°C to +50°C ambient, up to 4000m altitude, IP54 outdoor, salt-spray resistant.
Full English Documentation
Spec sheet, GA drawing, test report, nameplate, installation manual — all in English.
Material Brand Options
Core steel (Baosteel/Wuhan/Tianwei), copper ( Jiangxi/Yunnan), oil (Nynas/Karamay) — selectable per customer request.
Third-Party Witness
Independent witness inspection can be coordinated with the customer’s nominated inspection company. Witnessed reports are provided when included in the order scope.
OEM Support
OEM branding on nameplate, tank, and documentation. Private label available.
20+ Years Experience
Manufactured by a 20+ year transformer factory with 50,000㎡ facility and 15+ design engineers.
Applications
Where this transformer is used — connecting the product to real-world industry applications.
Utility Distribution
Distribution networks for utility companies — 10/0.4kV and 20/0.4kV step-down.
Industrial Facility
Factory main and distribution transformers — 10kV/0.4kV for plant power supply.
Solar Plant
Auxiliary power transformers for solar PV plant internal distribution.
Commercial Building
Building power supply — underground vault or substation installation.
Mining Project
Surface mining distribution — with enhanced protection for dust environment.
Oil & Gas Facility
Refinery and processing plant distribution transformers.
Quality Proof — 9-Step Manufacturing Process
Every transformer passes through 9 quality-controlled stages, from raw material to shipping. Full traceability with documentation at every step.
Material Inspection
Raw material verification — core steel, copper, oil, accessories checked against certificates before production.
Core Cutting
CNC step-lap core cutting for low-loss grain-oriented silicon steel. Core loss measured before assembly.
Winding
Controlled winding tension, turn-count verification, and insulation paper application for each coil.
Assembly
Core-coil assembly with dimensional checks for fit, clearance, and clamping force.
Vacuum Drying
High-vacuum drying ovens remove moisture from insulation before oil impregnation.
Oil Filling
Filtered insulating oil with breakdown voltage >70kV/2.5mm and moisture <10ppm.
Final Testing
Full routine test per IEC 60076-1 — insulation, resistance, ratio, losses, withstand.
Packing
Sea-worthy export packing with shock-fixed crating for ocean shipping.
Shipping
On-time delivery with documentation — test reports, drawings, manuals in English.
Need a Custom Transformer Solution?
Our engineering team can assess non-standard voltage, capacity, impedance, or environmental conditions — and deliver a full proposal within 48 hours.