Oil-Immersed Transformers · Distribution
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Voltage Class — 11 kV (11,000 V)
11kV Distribution & Power Transformers
11 kV is the dominant medium-voltage distribution standard across Sub-Saharan Africa, Southeast Asia, South Asia, and the Middle East. XinHuan manufactures IEC 60076 oil-immersed and cast resin dry-type transformers at 11 kV nominal primary voltage (stepping down to 400 V / 415 V), from 50 kVA to 2500 kVA.
50–2500
kVA range
11 / 0.4 kV
rated voltage
IEC 60076
certified
24h
quote response
Product Range
11kV Distribution & Power Transformers — 175 Models Available
Standard and custom capacities available for global utility, industrial, and commercial projects. View complete catalog →
Dry-Type Transformers · Harmonic K-Factor (IEEE C57.110)
630 kVA K-13 VFD Dedicated Dry-Type Cast Resin Transformer (11kV/415V)
630 kVA K-13 dry-type transformer engineered specifically for large motor drive...
Compact Substations · European Type (IEC)
630 kVA 11kV Three-Phase European Type Compact Substation
This 630 kva three-phase european type compact substation is an integrated...
Isolation Transformers · Custom & Industrial Oil
2000 kVA 11kV Three-Phase K-Factor Isolation Oil Transformer
This 2000 kva three-phase k-factor isolation oil transformer is configured for a...
Switchgear & Control · High/Medium Voltage (MV)
11kV Indoor High Voltage Electrical Control Cabinet
This indoor high voltage electrical control cabinet is designed for...
Oil-Immersed Transformers · ANSI/LatAm Standard
75 kVA 13.2kV Three-Phase Oil-Immersed Distribution Transformer
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Dry-Type Transformers · Harmonic K-Factor (IEEE C57.110)
500 kVA K-13 Non-Linear Load Cast Resin Dry-Type Transformer (11kV/415V)
500 kVA / K-13 cast resin dry-type transformer engineered for high-density...
Compact Substations · European Type (IEC)
500 kVA 11kV Three-Phase European Type Compact Substation
This 500 kva three-phase european type compact substation is an integrated...
Isolation Transformers · Custom & Industrial Oil
1000 kVA 11kV Three-Phase K-Factor Isolation Oil Transformer
This 1000 kva three-phase k-factor isolation oil transformer is configured for a...
Switchgear & Control · High/Medium Voltage (MV)
11kV KYN28 Three-Phase High Voltage Switchgear Panel
This kyn28 three-phase high voltage switchgear panel is designed for...
Oil-Immersed Transformers · ANSI/LatAm Standard
75 kVA 13.8kV Three-Phase Oil-Immersed Distribution Transformer
This 75 kVA oil-immersed distribution transformer is designed for dependable...
Dry-Type Transformers · Harmonic K-Factor (IEEE C57.110)
315 kVA K-13 Harmonic Rated Cast Resin Dry-Type Transformer (11kV/415V)
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Technical Overview
11kV to 400V / 415V — Global Utility & Industrial Standard
11 kV (11,000 V nominal, 12 kV highest system voltage Um, 75 kV BIL lightning impulse withstand) is the primary medium-voltage distribution class deployed across IEC utility grids in Africa, the UK, India, Pakistan, Bangladesh, Malaysia, Myanmar, and GCC nations. Standard distribution configurations step 11 kV down to 400 V or 415 V three-phase (230 V / 240 V single-phase) with a Dyn11 vector group.
XinHuan manufactures both hermetically sealed corrugated-tank oil-immersed transformers (S11, S13, S20, and amorphous alloy SBH15) and epoxy cast-resin dry-type transformers (SCB13, SCB14, Class F/H insulation) at 11 kV. Every unit features high-permeability grain-oriented silicon steel laminations, electrolytic copper or aluminum windings, and ±2 × 2.5% off-circuit tap changers (or OLTC on request).
Every 11 kV transformer undergoes 100% routine Factory Acceptance Testing (FAT) in our Hefei high-voltage laboratory per IEC 60076-1 and IEC 60076-3: winding resistance, voltage ratio and vector group verification, short-circuit impedance and load loss (Pk), no-load loss and current (Po / Io), power-frequency AC withstand (28 kV HV / 3 kV LV), and induced overvoltage withstand.
11kV Distribution & Power Transformers — Key Specifications
-
Rated Primary Voltage
11 kV (10.5 kV / 11 kV / 11.5 kV configurable)
-
Rated Secondary Voltage
0.4 kV (400 V / 415 V / 433 V three-phase)
-
Insulation Level (LI / AC)
75 kV peak lightning impulse / 28 kV 1-min power frequency (Um = 12 kV)
-
Capacity Range
50 kVA – 2500 kVA distribution; up to 31.5 MVA power class
-
Construction Types
Oil-Immersed (ONAN/ONAF) & Cast Resin Dry-Type (AN/AF) & Pad-Mounted
-
Vector Group & Taps
Dyn11 (standard) or Yyn0; ±2 × 2.5% or ±4 × 2.5% OCTC
-
Short-Circuit Impedance
4.0% (50–630 kVA) / 4.5%–5.0% (800–1000 kVA) / 6.0% (1250–2500 kVA)
-
Applicable Standards
IEC 60076-1, IEC 60076-11, GB/T 1094, BS EN 50588, SANS 780
IEC / IEEE Reference Data
11kV Distribution & Power Transformers — Standard Capacity & Loss Parameters
| Rated Capacity | Voltage Ratio (HV / LV) | No-Load Loss (P0) | Load Loss (Pk) | Impedance (Uk%) | No-Load Current (I0%) | Approx. Total Weight |
|---|---|---|---|---|---|---|
| 50 kVA | 11 / 0.4 kV | 105 W | 870 W | 4.0% | 1.4% | 420 kg |
| 100 kVA | 11 / 0.4 kV | 170 W | 1,500 W | 4.0% | 1.2% | 640 kg |
| 200 kVA | 11 / 0.4 kV | 290 W | 2,600 W | 4.0% | 1.0% | 960 kg |
| 315 kVA | 11 / 0.4 kV | 410 W | 3,650 W | 4.0% | 0.9% | 1,280 kg |
| 500 kVA | 11 / 0.4 kV | 590 W | 5,150 W | 4.0% | 0.8% | 1,750 kg |
| 630 kVA | 11 / 0.4 kV | 710 W | 6,200 W | 4.5% | 0.7% | 2,080 kg |
| 800 kVA | 11 / 0.4 kV | 860 W | 7,500 W | 5.0% | 0.7% | 2,480 kg |
| 1000 kVA | 11 / 0.4 kV | 1,030 W | 9,000 W | 5.0% | 0.6% | 2,920 kg |
| 1250 kVA | 11 / 0.4 kV | 1,220 W | 11,000 W | 5.5% | 0.6% | 3,520 kg |
| 1600 kVA | 11 / 0.4 kV | 1,480 W | 13,500 W | 6.0% | 0.5% | 4,260 kg |
| 2000 kVA | 11 / 0.4 kV | 1,810 W | 16,200 W | 6.0% | 0.5% | 5,150 kg |
| 2500 kVA | 11 / 0.4 kV | 2,150 W | 19,500 W | 6.0% | 0.4% | 6,180 kg |
Guaranteed parameters based on standard factory testing. Custom loss levels (Tier-2 Ecodesign, DOE 2016, and high-efficiency low-noise designs) are engineered on request.
11kV Distribution & Power Transformers — 3D Engineering Anatomy Cutaway
High-precision 3D component breakdown of 11kV Distribution & Power Transformers illustrating CRGO silicon steel core assembly, electrolytic copper windings, insulation, and protection accessories.
High-Grade Silicon Core
Electrolytic Copper Coil
Off-Circuit / OLTC Tap Switch
Buchholz & Temp Relays
11kV Distribution & Power Transformers — Factory Acceptance Testing (FAT)
Watch routine factory testing and quality control inspections inside XinHuan's manufacturing facility.
100% full routine tests (IEC 60076) conducted before export packing.
Engineering Submittal & Layout Workbench
Substation Room Fit & Multi-Equipment CAD Footprints
Select your equipment type and capacity to inspect verified GA engineering CAD line drawings, Single Line Diagrams (SLD), dimensions (L × W × H), roller gauge, and submittal clearances before procurement.
Available Ratings:
11kV / 33kV Dual Voltage
IEC 60076 / IEEE Compliant
100% Routine Factory Tested
Export Nitrogen / Seaworthy Pack
1000 kVA Technical Dimensions
IEC 60076-1International utility & industrial submittal specifications
| Overall Length (L) | 1,750 mm |
|---|---|
| Overall Width (W) | 1,120 mm |
| Overall Height (H) | 1,780 mm |
| Roller Wheel Track Gauge (D) | 820 mm |
| Total Equipment Net Weight | 3,820 kg |
| Min Substation Clearance | 1,000 mm surrounding |
| Rated Voltage / System | 11 kV / 33 kV Dual Primary |
| Applicable Standard | IEC 60076-1 / IEEE C57 |
Download Technical Data Sheet (PDF)
Request Factory Engineering Submittal Package
Full CAD DXF/DWG vector footprints, 3D STEP models, and custom project submittals provided within 2 hours upon request.
Factory Facility & Verification
Real Completed Transformers & Factory Workshop
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.
Finished Transformer Workshop
Real completed units staged in orderly rows, ready for final project inspection, FAT witnessing, and international dispatch.
Dry-Type Transformer Bay
F/H-class cast resin coils and harmonic mitigation dry-type distribution transformers in stock.
Finished Products Area
Clear production-stage segregation and routine quality verification for procurement teams prior to container packaging.
Active Assembly Floor
Precision silicon steel core stacking, copper coil winding assembly, and tank fabrication.
Vacuum Autoclave Drying
Heavy-duty vacuum autoclave drying process ensuring zero residual moisture in coil insulation.
Export Preparation & Shipping
Direct container packing and heavy-duty ocean freight loading outside our Hefei facility.
Quality & Compliance
Certified B2B Manufacturing & Laboratory Performance
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.
IAF / CNAS Accredited
ISO 9001:2015 Quality System
Certified Quality Management System covering design, coil winding, vacuum drying, oil filling, and routine testing of 10kV–35kV distribution transformers.
Environmental System
ISO 14001:2015 Environmental
Environmental Management System certifying low-loss eco-designed core assemblies, zero PCB insulation oil, and environmentally safe production controls.
Occupational Health
ISO 45001:2018 Safety System
Occupational Health and Safety Management System ensuring safety containment in high-voltage testing bays and factory assembly protocols.
CNAS Lab Type Tests
IEC 60076 & GB Type Tests
Complete routine and type test records (temperature rise, impulse voltage withstand, short-circuit withstand) conducted at CNAS-accredited national research institutes.
SGS Audited Supplier
SGS Verified Manufacturer Audit
On-site factory audit certificate by SGS / Made-in-China, verifying manufacturing premises, export capacity, assembly lines, and legal qualification.
≥180 Units/Yr Export
International Delivery Certificate
Verified annual supply performance and delivery certificate for overseas power grid EPC and industrial infrastructure projects (Mozambique, Nigeria, Kenya, SEA).
Technical Q&A
Frequently Asked Questions — 11kV Distribution & Power Transformers
An 11kV transformer is a medium-voltage power or distribution transformer rated for an 11,000V nominal primary network (Um = 12kV, 75kV BIL). It steps voltage down to 400V or 415V three-phase for utility substations, industrial plants, commercial complexes, mining camps, and solar step-up stations.
Yes. We manufacture 11kV/400V, 11kV/415V, and 11kV/433V no-load secondary ratios according to local utility regulations, complete with ±2×2.5% or ±5% off-circuit tap changers to compensate for feeder voltage drop.
11kV oil-immersed transformers (S13/S20) offer lower initial cost, compact outdoor footprint, and higher overload tolerance for outdoor pole-mount or pad/substation installations. 11kV cast resin dry-type transformers (SCB13/SCB14) are flame-retardant, self-extinguishing (F1/C2/E2), and maintenance-free, making them mandatory for indoor basements, hospitals, high-rise buildings, and data centers.
Dyn11 uses a Delta (D) primary winding that traps 3rd-order harmonic currents circulating in the loop, paired with a grounded Star (yn) secondary that provides a stable 4-wire neutral for single-phase 230V/240V loads and earth-fault protection.
Every unit undergoes 100% IEC 60076-1 routine testing in our Hefei laboratory: DC winding resistance, voltage ratio and phase displacement check, short-circuit impedance and load loss measurement, no-load loss and excitation current measurement, 28kV AC separate-source dielectric withstand, and 2×Un induced overvoltage test. Full certified FAT reports accompany every shipment.
Copper windings offer higher thermal conductivity, smaller physical footprint, and superior short-circuit mechanical withstand. Aluminum windings reduce upfront transformer procurement cost by 15-22% while matching identical electrical efficiency and temperature rise guarantees through larger conductor cross-sections.
Standard production lead time is 2 to 3 weeks for standard distribution capacities (50kVA–1600kVA). Ocean shipping from Shanghai/Ningbo port takes approximately 22–32 days to Lagos (Nigeria), Mombasa (Kenya), Tema (Ghana), Durban (South Africa), and 15–20 days to Jebel Ali (UAE) and Dammam (Saudi Arabia).
Please provide: rated capacity (kVA), HV/LV voltage ratio (e.g., 11kV / 0.415kV), construction type (oil-immersed or dry-type), winding material (copper or aluminum), frequency (50Hz or 60Hz), quantity, and destination port for a firm EXW, FOB, or CIF quote within 24 hours.
Export Markets
Where 11kV Distribution & Power Transformers Are Supplied
Engineering Reference Silo
Transformer Category Pillars & International Standards
Engineering Link Magnets & CAD Resources:
11kV Distribution & Power Transformers — Direct Factory Quotation
Request Engineering Submittals & Price
Include capacity (kVA), primary voltage (11 kV), secondary voltage (400V/415V), standard (IEC/GB), destination port, and required quantity. Our engineers respond with certified data sheets within 24 hours.