400 kVA Step Down Oil-Immersed Distribution Transformer, 13.8 kV to 480Y/277 V, ANSI Standard

400 kVA Step Down Oil-Immersed Distribution Transformer For Sale

The 400 kVA Step Down Oil-Immersed Distribution Transformer is designed to deliver reliable medium-to-low voltage power conversion for commercial, industrial, and utility sectors throughout North America and Europe. This 400 kVA oil-filled step-down transformer efficiently converts a primary voltage of 13.8 kV to a standard 480Y/277 V secondary output, making it ideal for office complexes, manufacturing facilities, residential substations, and renewable energy installations.

Constructed with premium copper windings and a grain-oriented silicon steel core, the 400 kVA oil-immersed distribution transformer offers low core losses, quiet operation, and superior thermal stability. Its primary winding is configured in Delta, with a grounded Wye secondary, fully compliant with ANSI C57 standards and supporting both 50 Hz and 60 Hz power systems.

Built for durability and longevity, this oil-filled 400 kVA step-down transformer is housed in a sealed tank with corrosion-resistant coating, suitable for both indoor and outdoor applications. The standard ONAN (Oil Natural Air Natural) cooling system ensures efficient heat dissipation, with an optional upgrade to ONAF (Oil Natural Air Forced) for high-temperature environments.

Voltage customization is available for this 400 kVA oil-immersed transformer, including primary inputs of 12.47 kV or 13.2 kV to meet local distribution codes in the US, Canada, UK, Germany, France, the Netherlands, Spain, Italy, and other European markets. Each unit undergoes comprehensive testing—such as vector group verification, temperature rise measurement, dielectric withstand, and load loss testing—to guarantee safety, reliability, and compliance with IEC 60076, IEEE, CSA, UL, and CE certifications.

Energy Transformer offers flexible OEM and ODM manufacturing services for this 400 kVA step down oil-immersed distribution transformer, providing factory-direct pricing and expedited delivery options. Our supply chain supports large-scale infrastructure projects, EPC contractors, and utilities across North America, Europe, Australia, and beyond.

Whether upgrading existing power grids, expanding industrial power capacity, or integrating distributed renewable energy, this 400 kVA oil-filled distribution transformer delivers the efficiency, durability, and regulatory compliance your project demands.

Learn More：500 kVA 11kV/0.4kV Oil-Filled Medium Voltage Electrical Distribution Transformer

400 kVA Step Down Oil-Immersed Distribution Transformer Technical Specs

No.	Item	Specification	Description
1	Rated Capacity	400 kVA	Suitable for small to medium commercial and industrial electrical distribution networks
2	Primary Voltage	13.8 kV (Delta)	Designed for standard 13.8 kV distribution feeders; custom options include 12.47 kV, 11 kV
3	Secondary Voltage	480Y/277 V	Standard output for U.S., Canada, and Mexico commercial systems; 400/230 V and 415Y/240 V available
4	Frequency & Phases	3-phase, 60 Hz (50 Hz optional)	Compatible with both American and European grid systems
5	Cooling Method	ONAN – Oil Natural Air Natural	Quiet, passive cooling system with optional ONAF radiator upgrade
6	Core Material	CRGO silicon steel	Cold-rolled grain-oriented steel core ensures energy efficiency and reduced iron losses
7	Insulating Oil	Mineral oil (IEC/ASTM grade)	Dielectric fluid ensures thermal performance and insulation reliability
8	Max Temp Rise	55°C / 65°C	Energy-optimized designs available for extended service life and efficiency
9	Enclosure Type	Weatherproof sealed tank	Designed for harsh environments; pad-mount, pole-mount or custom skid options available
10	Compliance Standards	ANSI C57, IEC 60076, IEEE, CSA	Fully certified for safe use in U.S., Canada, UK, and EU markets
11	Certifications	UL, CE, CSA, ISO 9001	Approved for international use including USA, Canada, EU, Middle East, and Australia
12	Vector Group	Dyn11 (standard)	Also available in YNd1, Dd0, or Yyn0 for project-specific grounding strategies
13	Applications	Office buildings, light industry, schools	Widely used in healthcare, shopping centers, EV charging stations, and utilities
14	Protection Devices	Temp sensors, oil level sight, PRV	Optional surge arresters, drain valve, Buchholz relay for high-spec installations
15	Unit Weight	~950–1,250 kg	Final weight based on voltage class, cooling size, and accessories
16	Efficiency Level	DOE 2016 compliant	Meets or exceeds U.S. Department of Energy efficiency requirements
17	Base & Mounting	Steel skid frame	Lifting lugs and forklift slots included for safe handling
18	Operating Climate	-25°C to +45°C	Arid, coastal, and cold climate options available (-40°C rating optional)
19	Full Load Loss	Approx. 1.0%	Optimized for commercial peak-hour performance
20	No-Load Loss	≤ 0.25%	Reduced energy draw during idle and low-load operation
21	Load Losses	≤ 0.85%	Engineered copper windings deliver stable voltage during demand surges
22	Impedance	5.0% ±10%	Custom impedance available to support grid coordination and fault current limits
23	Short-Circuit Strength	Up to 16 kA for 2s	Mechanical structure built to withstand system-level faults
24	Insulation System	Class A (105°C)	Upgradable to Class B (130°C) or Class F (155°C) for extreme duty
25	Conductor Material	Copper standard; Aluminum optional	Copper offers better thermal performance and longer lifespan
26	Tap Range	±2 × 2.5% manual tap changer	On-load tap changer (OLTC) available upon request
27	Bushing Type	Porcelain or polymer	Available in ANSI or IEC dimensions based on regional preferences
28	Oil Volume	Approx. 180 Liters	Specific capacity depends on cooling design and enclosure type
29	Service Life Expectancy	20–30 years	Low maintenance transformer engineered for longevity
30	Sound Level	≤ 52 dB @ 1 meter	Quiet operation suitable for residential or public zones
31	Warranty	Standard 2 years	Extended warranties up to 5 years available for EPC and municipal projects
32	Lead Time – Stock	15–25 days	Most standard models available with short turnaround
33	Lead Time – Custom	35–50 days	Custom-engineered configurations supported by scalable production
34	Price Range	Request a quote	Pricing based on quantity, destination country, and certification scope
35	Country of Origin	Energy Transformer – China	OEM/ODM manufacturer with global delivery to the U.S., Europe, and Australia

✅ 400 kVA Oil-Immersed Distribution Transformer Overview

ENERGY TRANSFORMER's 400 kVA three-phase oil-filled distribution transformer is engineered for stable and efficient voltage step-down from 13.8 kV to 480Y/277 V. Ideal for low-voltage distribution in commercial, institutional, and light industrial settings, it complies with ANSI, IEEE, CSA, and IEC standards, meeting the requirements of North American and European electrical grids.

✅ 400 kVA Transformer Applications

Designed for apartment complexes, office buildings, retail outlets, municipal facilities, schools, logistics centers, and light manufacturing. Fully compatible with solar PV integration, EV charging networks, battery storage systems, and backup generators.

✅ 400 kVA Transformer Manufacturer – ENERGY TRANSFORMER

As a certified OEM/ODM manufacturer with ISO 9001, CE, UL, and CSA certifications, we supply private-labeled and fully customized transformer solutions. ENERGY TRANSFORMER supports EPC contractors, utilities, and wholesalers across the US, Canada, UK, Germany, Netherlands, Spain, Italy, Australia, and LATAM.

✅ 400 kVA Transformer Supply for USA & Canada

We provide UL-listed transformers for the United States and CSA-certified models for Canada. Complete export documentation, NAFTA/USMCA compliance, and local adaptation support available. Field installation guidance offered upon request.

✅ 400 kVA Transformer for Sale – Stock & Custom Options

Available for immediate shipment from warehouse or made-to-order within 35–55 days. Fast delivery to New York, Chicago, Houston, Los Angeles, Toronto, Vancouver, Monterrey, and Miami. Incoterms: FOB, CIF, or DDP.

Learn More:750 kVA Distribution Transformer from Certified Manufacturers | 13.2 kV to 208Y/120 V Three-Phase Power

✅ Electrical Configuration – 400 kVA Transformer

Primary Voltage: 13.8 kV Delta
Secondary Voltage: 480Y/277 V Grounded Wye
Optional input ranges: 11–15 kV
Alternative secondary options: 208Y/120 V, 415/240 V

✅ 400 kVA Transformer Amps (Approximate)

Low Voltage Side (480 V): ≈ 481 A
High Voltage Side (13.8 kV): ≈ 16.7 A
📌 Formula: Amps = (kVA × 1000) / (√3 × Voltage)

✅ 400 kVA Transformer Dimensions & Mounting

Size: ~1900 mm × 1200 mm × 1600 mm (L×W×H)
Mounting: Pad-mounted with steel skid base or custom enclosure
Weight: 1,000 – 1,400 kg depending on cooling and features

✅ Cooling & Oil System

Cooling Type: ONAN (Oil Natural Air Natural)
Insulating Fluid: Mineral oil per ASTM D3487 / IEC 60296
Optional: Silicone-based or biodegradable fluids for eco-sensitive zones
Oil Capacity: 180–220 liters

✅ Energy Efficiency & Standards Compliance

Meets or exceeds DOE 2016, C802.1, and Tier 2 efficiency benchmarks
Manufactured using CRGO silicon steel core and vacuum-dried copper windings
Certifications: ANSI C57, IEEE, UL, CSA, CE, ISO 9001

✅ Voltage Tap Changer Options

Standard Off-Load Tap Changer (±2×2.5%)
Optional: On-Load Tap Changer (OLTC) with motorized control for automatic voltage regulation under dynamic load conditions

✅ 400 kVA Transformer Enclosure & Protection

Sealed steel tank with UV- and corrosion-resistant coatings
Ingress Rating: IP23 (standard), IP54 (optional coastal/humid zones)
Standard Accessories: Pressure relief valve, temperature gauge, oil level indicator
Optional: Surge arresters, Buchholz relay, oil drain valve

Read More:200 kVA Oil-Immersed 3 Phase Step Down Transformer, 11kV to 400V, IEC/ANSI Compliant

✅ Transformer Delivery & Lead Time

Stock Models: 25–35 days
Custom Builds: 50–65 days
Delivered fully assembled and oil-filled. Includes electrical test reports, connection drawings, and installation manual.

✅ Certifications & Factory Testing

Routine, type, and special test reports per ANSI, IEC
Third-party testing & inspection available via SGS, TUV, Intertek
Compliance with IEEE C57, IEC 60076, CSA C2.1

✅ Wholesale 400 kVA Transformers for Global Distribution

Bulk transformer supply for EPC contractors, utilities, and equipment integrators. OEM and white-label support available with flexible MOQs.

✅ Related Transformer Models

• 300 kVA, 500 kVA, 630 kVA, 1000 kVA available

• Dry-type, pole-mounted, and cast resin versions

• Options for inverter step-up transformers, marine-grade units, and solar-ready designs

Read More:1500 kVA 11kV to 400V Oil Filled Three Phase Distribution Transformer | IEC & ANSI Standards

Manufacturing Facility and Inventory for 400 kVA Step Down Oil-Immersed Distribution Transformer

✅ FAQs – 400 kVA Oil-Filled Transformer

Q: What's the expected service life of a 400 kVA transformer?
A: 25–30 years with standard maintenance
Q: Is this transformer suitable for solar or backup systems?
A: Yes, it's compatible with hybrid systems including PV, battery storage, and diesel gensets
Q: Can I get it with UL only or dual certifications?
A: Yes, available in UL-only, CSA-only, or dual-cert versions

📞 Contact ENERGY TRANSFORMER today to get a custom quote, technical datasheet, or installation consultation for your 400 kVA distribution transformer project. Now shipping across the US, Canada, Europe, and LATAM with full certification and flexible logistics.