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Oil-Immersed Transformers
Power Transformers
SKU: 40_MVA_66KV_11KV_THREE_PHASE_OIL_IMMERSED_POWER_TRANSFORMER
40 MVA 66kV/11kV Three-Phase Oil-Immersed Power Transformer
This 40 MVA / three-phase oil-immersed power transformer is designed for utility substation, grid interconnection, and large industrial applications. Suitable for transmission and sub-transmission voltage classes. IEC 60076 design reference; ONAN/ONAF cooling options available. Manufactured and exported from Hefei, China.
Compliance Standards
IEC • ANSI • IEEE • GB
Quality Inspection
100% FAT Routine Tested
Engineering CAD
2D CAD / SLD Schematics
Global Logistics
Direct Seaport CIF Export
Engineering Datasheet
Technical Parameters & Ratings
IEC / ANSI Certified
Factory Standard
| Rated Capacity | 40 MVA (40,000 kVA) |
|---|---|
| High Voltage | 66.0 kV |
| Low Voltage | 11.0 kV / customized |
| Frequency | 50 Hz / 60 Hz |
| Phase | Three Phase |
| Cooling Method | ONAN / ONAF optional |
| Vector Group | YNd11 / YNyn0 / customized |
| Tap Changer | On-load tap changer (OLTC) / Off-circuit optional |
| Tapping Range | +/-8 x 1.25% (OLTC) / +/-2 x 2.5% (OCTC) |
| Winding Material | Copper |
| Core Material | CRGO silicon steel, grain-oriented |
| Insulation Medium | Mineral insulating oil |
| Standard | IEC 60076 design reference |
| Installation | Outdoor substation / indoor GIS substation |
Application Scenarios
- Utility substation step-down at / for distribution networks
- Grid interconnection and power transmission projects in Africa and MENA
- Large industrial facility main power supply transformers
- EPC contractor packages for power plant auxiliary and grid connection
Key Features
- 40 MVA rated capacity for utility substation and grid applications
- high voltage class for sub-transmission and transmission grid interconnection
- ONAN standard cooling with ONAF upgrade option for higher ambient temperature sites
- On-load tap changer (OLTC) available for voltage regulation under load
- Full copper windings with CRGO grain-oriented silicon steel core for low losses
Engineering Submittal Drawing
2D AutoCAD General Arrangement (GA) Drawing & Footprint
Official XinHuan factory 2D vector General Arrangement drawing for 40 MVA 66kV/11kV Three-Phase Oil-Immersed Power Transformer. Includes front elevation view, top plan view, terminal centerline clearances, base channel mounting footprint, and complete vector group connection schematics.
Dimensions ($L \times W \times H$ mm)
Terminal Centerline Clearances
Base Channel Mounting Pitch
Vector Group & Rating Plate
XinHuan Hefei Manufacturing Plant — Precision Winding & Assembly Line
Factory Build Quality
Internal Construction & Premium Materials
Built with tier-1 certified raw materials engineered for long operational life (>30 years), superior dielectric withstand, and high short-circuit withstand capacity.
Silicon Steel Core
High-grade grain-oriented cold-rolled silicon steel with step-lap mitered joints for low $P_o$ losses.
100% Copper Windings
Electrolytic oxygen-free copper with high thermal grade insulation for surge resistance.
Precision Tap Changer
De-energized tap switch ($\pm 2 \times 2.5\%$) or on-load vacuum tap changer (OLTC) optional.
Protection & Sensors
Buchholz gas relay, magnetic oil gauge (MOG), and dial thermometers with alarm contacts.
Quality Assurance
CNAS & ISO 9001 Certified
100% Factory Acceptance Testing (FAT) Protocol
Every transformer unit manufactured by XinHuan undergoes mandatory routine factory testing prior to container dispatch. Full certified routine and type test submittal reports are provided with commercial documentation:
1. Insulation Resistance
Megger test (HV to LV, HV to Earth, LV to Earth) >1000 MΩ.
2. Voltage Ratio & Vector
Turns ratio check across all taps with phase displacement check.
3. Winding DC Resistance
Precision Kelvin bridge measurement across all tap positions.
4. Short-Circuit Impedance
Load loss ($P_k$) measurement corrected to reference temp (75°C).
5. No-Load Loss & Current
Core excitation test ($P_o$ and $I_o$) at rated sinusoidal voltage.
6. AC Voltage Withstand
Power-frequency separate source test (e.g. 50kV/70kV 1 min).
7. Lightning Impulse (BIL)
Full wave & chopped wave impulse withstand (BIL up to 170kV).
8. Partial Discharge & Seals
Ultra-low discharge (<5 pC) and pressurized oil/gas tightness test.
Logistics Intelligence
Global CIF / FOB Delivery
Export Packaging & Seaport Logistics
Large power transformers are shipped with oil-filled or oil-free transport options depending on voltage class and destination. All units include full documentation: routine test report, nameplate data, packing list, and certificate of origin. Lead time is confirmed at order stage based on specification complexity.
Production Lead Time
Standard manufacturing cycle is 4 to 6 weeks from approval of GA blueprints and single-line diagrams.
Heavy-Duty Export Packaging
Vacuum moisture barrier preservation, nitrogen blanketing, and reinforced steel-frame structural crate skids.
Direct Seaport Routes
Fast ocean freight to Port of Chancay & Callao (25-35 days), Manila, Lagos, and Middle East ports.
Equipment Video Inspection
100% TestedWatch XinHuan technicians perform routine dielectric testing, winding insulation checks, and quality inspections inside our Hefei manufacturing plant.
Every unit 100% routine tested before container loading.
Direct Factory Consultation
Need Custom Project Engineering?
Send your single-line diagram (SLD), voltage ratings, or tender specifications. Our chief electrical engineers will review and issue an actionable CIF quotation within 24 hours.
Custom Voltage Ratios
High-Altitude Derating
Short-Circuit Impedance
Third-Party FAT Witness
Engineering & Procurement FAQs
Frequently asked questions regarding specifications, certifications, and delivery for 40 MVA 66kV/11kV Three-Phase Oil-Immersed Power Transformer.
Please send us your required MVA rating, primary voltage, secondary voltage, frequency (Hz), cooling class (ONAN/ONAF/OFAF), vector group, impedance, and installation site conditions. We will respond with a technical proposal and indicative pricing within 24 hours.
The product can be produced according to IEC 60076 and customer technical specifications for power transformer applications. Routine and type tests including temperature rise, impulse, and short-circuit withstand are available. Third-party witnessed testing can be arranged.
Standard manufacturing lead time is 4 to 6 weeks following approval of GA blueprints and single-line diagrams. Direct sea container shipping is available under FOB, CFR, or CIF terms with full customs documentation (Bill of Lading, Certificate of Origin, Test Reports).