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Oil-Immersed Transformers
High Efficiency (S22)
SKU: 250_KVA_11KV_S20_HIGH_EFFICIENCY_THREE_PHASE_OIL_TRANSFORMER
250 kVA 11kV S20 High-Efficiency Three-Phase Oil Transformer
This 250 kVA high-efficiency three-phase oil transformer is intended for distribution projects that prioritize reduced no-load loss, stable service life, and practical export-oriented configuration. Depending on the model, it uses an optimized core design to support energy-saving performance in utility and industrial networks.
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
| Rated Capacity | 250 kVA |
|---|---|
| Primary Voltage (U1) | 11,000 V (11 kV) |
| Secondary Voltage (U2) | 415 V / 240 V (3-Phase 4-Wire) |
| Vector Group | Dyn11 |
| Rated Frequency | 50 Hz |
| Cooling Method | ONAN (Oil Natural Air Natural) |
| Primary Current (I1) | 4.37 A |
| Secondary Current (I2) | 347.8 A |
| Guaranteed No-Load Loss (P0) | 400 W |
| Guaranteed Load Loss (Pk at 75°C) | 2750 W |
| Short-Circuit Impedance (Uk) | 4.0% |
| HV Insulation Level | LI 75 / AC 35 (11kV Class) |
| Temperature Rise Limits | Top Oil ≤ 50K, Winding ≤ 55K (45°C Ambient) |
| Creepage Distance | ≥ 31 mm/kV (Outdoor Tropicalized Porcelain) |
| Core & Coil Weight | 560 kg |
| Insulating Oil Weight | 370 kg |
| Total Assembled Weight | 1120 kg |
| Overall Footprint (L×W×H) | 1200 mm × 820 mm × 1380 mm |
| Governing Standards | IEC 60076, BS 171, SON NIS, NERC Code |
Technical Highlights
- This product combines dependable transformer platform design, flexible project configuration, and practical export-oriented construction. It is suitable for applications requiring stable electrical performance, configurable voltage ratios, outdoor durability, and documentation support for international project supply.
Application Scenarios
- Utility distribution networks
- Industrial plants and workshops
- Commercial buildings and mixed-use developments
- Public infrastructure projects
- Regional and municipal power distribution systems
Key Features
- 250 kVA rated capacity with optimized core design for energy-saving applications
- Three-phase oil-immersed structure for stable outdoor operating performance
- class configuration suitable for distribution and industrial feeder networks
- Low-loss design approach intended to reduce operating cost over service life
- Supports project-based winding, voltage ratio, and accessory customization
- Suitable for utility and industrial buyers prioritizing efficiency and life-cycle value
Optional Configurations
- Low-voltage side rating and voltage ratio
- Frequency: 50 Hz or 60 Hz
- Vector group and tapping range
- Copper or aluminum winding
- Cooling method, accessory package, and monitoring option
- Tank structure, coating system, and special environmental adaptation
- Color, nameplate language, and document package
- Ambient temperature, altitude, and installation condition adaptation
Engineering Submittal Drawing
2D AutoCAD General Arrangement (GA) Drawing & Footprint
Official XinHuan factory 2D vector General Arrangement drawing for 250 kVA 11kV S20 High-Efficiency Three-Phase Oil 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
The product is prepared for export shipment with suitable packing and transport arrangements based on destination and handling requirements. Technical documents, test reports, nameplate confirmation, and pre-shipment support can be supplied according to order requirements. OEM/ODM support and project-based coordination are available for qualified inquiries.
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 250 kVA 11kV S20 High-Efficiency Three-Phase Oil Transformer.
Please send us your required capacity, high voltage, low voltage, frequency, cooling preference, and installation conditions for the 250 kva s20 high-efficiency three-phase oil transformer. Our team can recommend a suitable configuration and provide a quotation based on your project requirements.
The product can be produced according to IEC standards and customer technical specifications. Routine factory tests, inspection records, and technical documentation can be provided before shipment. Optional configurations for project-specific grid, environmental, and accessory requirements are available upon request.
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).