Compact Substations · American Type (ANSI)
75 kVA 13.8kV Three-Phase Pad-Mounted Transformer (480Y/277V Radial Feed)
75 kVA to 480Y/277V three-phase liquid-filled pad-mounted transformer built to...
Equipment Standard — ANSI/IEEE C57.12.34 · 60Hz Underground Distribution
Three-Phase Pad-Mounted Transformers (ANSI / IEEE C57)
XinHuan manufactures high-performance three-phase liquid-filled pad-mounted compartmental transformers (75 kVA to 3000 kVA, primary voltages up to 34.5 kV) engineered for underground distribution networks, commercial shopping centers, industrial plants, EV charging hubs, and solar PV farms across the Americas, Philippines, and Caribbean. Fully compliant with ANSI/IEEE C57.12.34 and tamper-resistant per ANSI C57.12.28.
75–3000
kVA range
Up to 34.5 kV
HV primary class
ANSI/IEEE
C57.12.34 standard
24h
quote response
Product Range
Three-Phase Pad-Mounted Transformers (ANSI / IEEE C57) — 17 Models Available
Standard and custom capacities available for global utility, industrial, and commercial projects. View complete catalog →
Compact Substations · American Type (ANSI)
225 kVA 13.8kV Three-Phase Pad-Mounted Transformer (208Y/120V Loop Feed)
225 kVA to 208Y/120V three-phase pad-mounted transformer tailored for commercial...
Compact Substations · American Type (ANSI)
150 kVA 13.8kV Three-Phase Pad-Mounted Transformer (480Y/277V Loop Feed)
150 kVA three-phase loop-feed pad-mounted transformer with 6 high-voltage bushing...
Compact Substations · American Type (ANSI)
500 kVA 34.5kV Three-Phase American Type Pad-Mounted Substation
This 500 kva three-phase american type pad-mounted substation is an integrated...
Compact Substations · American Type (ANSI)
500 kVA 13.8kV Three-Phase American Type Pad-Mounted Substation
This 500 kva three-phase american type pad-mounted substation is an integrated...
Compact Substations · American Type (ANSI)
300 kVA 13.8kV Three-Phase American Type Pad-Mounted Substation
This 300 kva three-phase american type pad-mounted substation is an integrated...
Compact Substations · American Type (ANSI)
3000 kVA 34.5kV Three-Phase Pad-Mounted Transformer (480Y/277V Loop Feed)
3000 kVA / heavy-duty three-phase pad-mounted transformer engineered for...
Compact Substations · American Type (ANSI)
1500 kVA 13.8kV Three-Phase Pad-Mounted Transformer (480Y/277V Loop Feed)
1500 kVA to 480Y/277V three-phase compartmental pad-mounted transformer for heavy...
Compact Substations · American Type (ANSI)
750 kVA 13.8kV Three-Phase Pad-Mounted Transformer (480Y/277V Loop Feed)
750 kVA / three-phase compartmental pad-mounted transformer for industrial...
Compact Substations · Pad-Mounted Transformers
2500 kVA Three-Phase Pad-Mounted Transformer (ANSI C57.12.20)
Factory-direct 2500 kVA pad-mounted transformer engineered to ANSI C57.12.20...
Compact Substations · American Type (ANSI)
2500 kVA 34.5kV Three-Phase American Type Pad-Mounted Substation
This 2500 kva three-phase american type pad-mounted substation is an integrated...
Compact Substations · American Type (ANSI)
1000 kVA 34.5kV Three-Phase American Type Pad-Mounted Substation
This 1000 kva three-phase american type pad-mounted substation is an integrated...
Technical Overview
Pad-Mounted Transformers (ANSI C57.12.34) — Tamper-Proof Underground Power
Pad-mounted compartmental transformers are the gold standard for underground electric distribution across North and Latin America, the Philippines, and international commercial complexes. Because these units are installed outdoors in public-accessible green spaces, tamper resistance and public safety are paramount. XinHuan builds every cabinet with full compliance to ANSI C57.12.28, featuring concealed stainless steel hinges, captive penta-head security bolts, interlocking doors (LV door must open before HV latch can be released), and pry-bar resistant sills with gaps under 6.35 mm.
Our transformers are available in both Radial Feed (3 HV bushing wells) and Loop Feed (6 HV bushing wells for continuous ring distribution and isolation) configurations. Using universal IEEE 386 dead-front bushing wells, operators can safely make and break load connections with 200A or 600A separable insulated elbow connectors. Internal protection incorporates drawout Bay-O-Net expulsion fuses in series with current-limiting backup fuses (ELSP) to clear both low-current thermal overloads and high-energy short circuits.
Every unit is 100% factory acceptance tested in accordance with IEEE C57.12.90: winding resistance, voltage ratio and polarity check, no-load loss and excitation current, short-circuit impedance and load loss (Pk), applied and induced potential dielectric tests, and pressure leak testing. All units are finished in durable Munsell Green (7GY 3.29/1.5) powder coating resisting salt spray, humidity, and extreme UV exposure.
Three-Phase Pad-Mounted Transformers (ANSI / IEEE C57) — Key Specifications
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Governing Standards
ANSI/IEEE C57.12.00, C57.12.34, C57.12.28 (Enclosure), C57.12.90 (Testing)
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Capacity Range
75 kVA to 3000 kVA (Three Phase, 60 Hz or 50 Hz)
-
Primary Voltages (HV)
4.16 kV, 12.47 kV, 13.2 kV, 13.8 kV, 24.9 kV, 34.5Y/19.9 kV (Dead Front)
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Secondary Voltages (LV)
208Y/120V, 480Y/277V, 240V Delta, 4160V
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Feed Arrangement
Loop Feed (6 HV Bushings with 2/4-position oil switch) or Radial Feed (3 HV Bushings)
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Enclosure Security
ANSI C57.12.28 tamper-proof, captive penta-head bolt, padlockable handle, Munsell Green
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Primary Fuse Protection
Drawout Bay-O-Net overload fuses with internal backup current-limiting fuses (ELSP)
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Dielectric Fluid Options
Mineral insulating oil (ASTM D3487) or Cargill FR3 natural ester biodegradable fluid
IEC / IEEE Reference Data
Three-Phase Pad-Mounted Transformers (ANSI / IEEE C57) — 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 |
|---|---|---|---|---|---|---|
| 75 kVA | 13.8 kV / 480Y | 240 W | 980 W | 3.5% | 1.2% | 1,150 kg |
| 150 kVA | 13.8 kV / 480Y | 390 W | 1,650 W | 3.8% | 1.0% | 1,550 kg |
| 300 kVA | 13.8 kV / 480Y | 680 W | 2,950 W | 4.5% | 0.9% | 2,200 kg |
| 500 kVA | 13.8 kV / 480Y | 990 W | 4,400 W | 4.5% | 0.8% | 2,850 kg |
| 750 kVA | 13.8 kV / 480Y | 1,350 W | 6,200 W | 5.5% | 0.7% | 3,650 kg |
| 1000 kVA | 13.8 kV / 480Y | 1,680 W | 7,900 W | 5.75% | 0.6% | 4,400 kg |
| 1500 kVA | 13.8 kV / 480Y | 2,350 W | 11,200 W | 5.75% | 0.5% | 5,800 kg |
| 2000 kVA | 13.8 kV / 480Y | 2,950 W | 14,500 W | 6.0% | 0.5% | 7,100 kg |
| 2500 kVA | 13.8 kV / 480Y | 3,550 W | 17,800 W | 6.0% | 0.4% | 8,400 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.
Three-Phase Pad-Mounted Transformers (ANSI / IEEE C57) — 3D Engineering Anatomy Cutaway
High-precision 3D component breakdown of Three-Phase Pad-Mounted Transformers (ANSI / IEEE C57) 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
Three-Phase Pad-Mounted Transformers (ANSI / IEEE C57) — 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 — Three-Phase Pad-Mounted Transformers (ANSI / IEEE C57)
Radial Feed transformers have 3 high-voltage bushing wells (H1, H2, H3) and connect to a single primary power line (dead-end of a feeder). Loop Feed transformers have 6 high-voltage bushing wells (two per phase: A1/A2, B1/B2, C1/C2) and allow incoming power to enter the transformer and continue to adjacent pad-mounts on a distribution ring. Loop feed units typically include a 2-position or 4-position load-break oil switch, enabling utilities to isolate faults and back-feed power without customer downtime.
Dead-Front construction means all high-voltage electrical terminals and conductors in the primary compartment are fully insulated and grounded when mated with shielded separable connectors (elbows per IEEE 386). There are zero exposed live electrical components inside the cabinet, protecting utility technicians from accidental touch or arc-flash hazards during maintenance.
The primary circuit employs a coordinated two-stage protection system: drawout Bay-O-Net expulsion fuses protect against low-current overloads and secondary short circuits (and can be replaced safely by an operator using a hot-stick), while internal current-limiting backup fuses (ELSP) clear catastrophic high-energy primary faults (up to 50,000A) to prevent tank rupture.
Our cabinets feature recessed captive penta-head security bolts, shrouded padlock tabs, concealed heavy-duty hinges, and an interlocking door mechanism (the low-voltage door must be opened before the high-voltage latch can be released). Furthermore, all seams and sills resist pry-bar penetration, ensuring unauthorized persons cannot slip wires or tools into the compartment.
Yes. We offer Cargill Envirotemp FR3 natural ester vegetable oil as an option for green commercial developments, hospitals, universities, and solar plants. FR3 has a high fire point (>360°C), carries a UL/FM Global less-flammable classification, and is 100% biodegradable.
The two most common secondary configurations are 480Y/277V (for industrial machinery, large commercial lighting, and HVAC systems) and 208Y/120V (for office buildings, retail centers, and residential distribution). We also manufacture 240V delta and 4160V step-up/step-down ratings.
Every unit undergoes 100% routine tests in our Hefei facility per IEEE C57.12.90: winding resistance, voltage ratio and polarity check, short-circuit impedance and load loss (Pk), no-load loss and excitation current, applied potential and induced potential dielectric withstand, and positive pressure tank leak testing. Test reports accompany every shipment.
Please specify: kVA capacity (e.g. 500kVA, 1000kVA, 1500kVA, 2500kVA), primary voltage (e.g. 13.8kV or 34.5kV GrdY), secondary voltage (480Y/277V or 208Y/120V), feed type (Loop or Radial), fluid type (mineral oil or FR3), quantity, and destination port (e.g. Manzanilla, Callao, Valparaiso, Manila, Santo Domingo) for an official CIF or FOB quote within 24 hours.
Export Markets
Where Three-Phase Pad-Mounted Transformers (ANSI / IEEE C57) Are Supplied
Engineering Reference Silo
Transformer Category Pillars & International Standards
Engineering Link Magnets & CAD Resources:
Three-Phase Pad-Mounted Transformers (ANSI / IEEE C57) — Direct Factory Quotation
Request Engineering Submittals & Price
Include capacity (kVA), capacity (kVA), primary voltage (e.g. 13.8kV), secondary (480Y/277V), feed (Loop/Radial), destination port, and required quantity. Our engineers respond with certified data sheets within 24 hours.