500 kVA 11kV/0.4kV Oil-Filled Electrical Distribution Transformer – Factory Direct Supply

This 500 kVA oil-immersed three-phase distribution transformer is engineered to deliver reliable voltage conversion for commercial, industrial and utility applications across North America and Europe. Rated at 500 kVA, this medium-voltage (MV) transformer supports stable step-down operation from 11 kV to 0.4 kV, making it the ideal solution for low-voltage load centers such as municipal power grids, logistics parks, residential substations and manufacturing plants.

 

 

It features a robust 11 kV delta-connected primary winding and a earthed star-connected 0.4 kV secondary output. Custom voltage configurations (e.g., 10.5 kV/415 V or 12 kV/400 V) are available to comply with local distribution codes in the US, UK, Canada, Germany, France and other regions. The core is constructed with cold-rolled grain-oriented (CRGO) silicon steel to minimize iron losses, while the high-conductivity copper windings ensure low temperature rise and optimized short-circuit withstand capability.

 

Housed in a weatherproof, hermetically sealed steel tank filled with degassed mineral insulating oil, this 500 kVA oil-immersed transformer is suitable for both indoor and outdoor installation. The standard ONAN (Oil Natural Air Natural) cooling system enables quiet, low-maintenance heat dissipation, with optional radiator extensions for high-temperature environments. All GNEE products comply with IEC 60076, ANSI C57, CSA C2.1 and EN 50588 standards. Each 500 kVA MV transformer undergoes routine testing, including vector group verification, impulse withstand, temperature rise and insulation resistance tests, to ensure long-term grid reliability and safety.

 

We offer OEM and ODM services, supporting custom branding and mass production for EPC contractors and regional power suppliers worldwide. GNEE's core markets include the US, Canada, UK, Germany, France, Netherlands, Spain, Italy, Portugal and Australia.

 

Whether powering new commercial developments, upgrading distribution infrastructure or integrating clean energy into the grid, the 500 kVA distribution transformer delivers the reliable quality and flexibility your project requires.

 

Learn more: 400 kVA Step-Down Oil-Immersed Distribution Transformer, 13.8 kV to 480Y/277 V, ANSI Compliant

✅️Overview of the 500 kVA 11 kV/0.4 kV Oil-Immersed Distribution Transformer

The 500 kVA 11 kV/0.4 kV oil-immersed distribution transformer is an MV step-down unit designed to supply low-voltage power for residential, commercial and light industrial loads. Engineered for reliable, long-term stable operation, it steps down primary distribution voltage (typically 11 kV) to a 400 V (or 415 V) three-phase output for local grid use. Every unit complies with IEC, IEEE, ANSI and EN standards, and is suitable for outdoor or pad-mounted installation.

 

✅️Standard Ratings of the 500 kVA MV Transformer

Our 500 kVA distribution transformers feature standard input voltages such as 11 kV, 10 kV or 13.8 kV, and secondary voltages of 400 V or 415 V. They are available with two vector group configurations-Dyn11 and Yyn0-customizable to regional grid topologies. All units are equipped with an ONAN cooling system, oil temperature monitoring and overload protection, in compliance with IEC 60076 and IEEE C57 standards.

 

✅️Applications of the 500 kVA Step-Down Transformer

The 500 kVA oil-immersed transformer is widely used in urban substations, industrial parks, commercial complexes, hospitals, schools and rural electrification projects, serving as a critical component for MV to low-voltage grid conversion. It can withstand steady loads and minor surges, with high dielectric strength and excellent environmental adaptability.

 

✅️Transformer Dimensions and Space Planning

The typical 500 kVA 11 kV/0.4 kV transformer features a compact footprint: approximately 1.5–2.2 meters in length, 1.1–1.3 meters in width and 1.5–1.8 meters in height, with exact dimensions dependent on cooling methods and accessories. We provide base and lifting drawings to support civil engineering and layout design for your distribution projects.

 

 

✅️Weight and Transportation of the 500 kVA Oil-Immersed Transformer

The dry weight of a 500 kVA oil-immersed transformer is typically around 1,200–1,600 kg, while the shipping weight (including oil and conservator tank) may exceed 2,000 kg. All units are designed for handling by forklift or crane, with clearly marked lifting lugs and transport brackets. Shipping options include truck, container or flat rack, based on delivery requirements.

 

✅️Pricing Considerations for the 500 kVA Distribution Transformer

The cost of a 500 kVA distribution transformer varies based on core type (CRGO silicon steel or amorphous steel), winding material (copper or aluminum), tap changer options and regional compliance requirements. The standard ex-factory price range is USD 7,000 to 12,000, with customizable terminals, bushings and enclosures available upon request.

 

✅️Load Current and Technical Reference

Use the formula: Current (A) = (kVA × 1000) / (√3 × Voltage). For a unit with a 400 V output voltage and 500 kVA rated power, the full-load current is approximately 721 A. We provide nameplate data and secondary current specifications for current transformer/relay selection and protection device calibration.

 

✅️500 kVA Transformer Installation Guide

The transformer should be installed on a concrete pad or plinth with earthing systems, oil containment troughs and surge arresters. Our transformers are equipped with oil drain valves, thermometer pockets, oil level indicators and earthing terminals, complying with relevant codes for utility or industrial premises. Optional on-site commissioning and insulation resistance testing services are also available.

 

✅️Tank Construction and Protective Features

Each 500 kVA unit includes a hermetically sealed steel tank with a rust-inhibitive coating and welded joints. Some models are also fitted with a conservator tank with a silica gel breather, pressure relief valve, as well as temperature and oil level gauges. Internal protective devices include winding temperature detectors, with an optional Buchholz relay for enhanced fault monitoring.

 

✅️Customizable Voltage Classes and Vector Groups

Standard primary voltage: 11 kVSecondary voltage: 400 V or 415 VCommon vector groups: Dyn11, Yyn0 or YNd11, selected based on earthing and harmonic requirementsTap changers (±2.5% or ±5%) are available for voltage regulation to adapt to different load profiles.

 

✅️Copper vs. Aluminum Windings for 500 kVA Transformers

Copper windings offer higher thermal resistance and superior short-circuit withstand capability, while aluminum windings are lighter and more cost-effective. Both winding types are manufactured using automatic layer winding machines, vacuum drying and multi-layer insulation processes that comply with IEC and IEEE standards.

 

✅️Transformer Efficiency and Core Losses

Our 500 kVA distribution transformers deliver a typical full-load efficiency of over 98.8%. No-load losses are approximately 700–900 W, with load losses controlled below 6,000 W. We use CRGO silicon steel laminations and optimize magnetic flux path design to reduce the total cost of ownership.

 

✅️Standards and Quality Certifications

All transformers are manufactured in accordance with IEC 60076, ANSI C57, CE, ISO 9001 and CSA standards. Factory Acceptance Testing (FAT), impulse testing and temperature rise testing are conducted before delivery. Optional certifications include UL, GOST and UKCA to meet international deployment requirements.

 

✅️Global Delivery and Support

We export 500 kVA oil-immersed distribution transformers to North America, Europe, Southeast Asia, the Middle East and Africa. Our global logistics team ensures compliant packaging, meticulous route planning and customs clearance support. In addition, we provide technical support and warranty services through our global network of partners.

 

✅️Related Distribution Transformer Solutions

• 250 kVA 11 kV/0.4 kV Oil-Immersed Transformer | IEC/ANSI Compliant
• 630 kVA 10 kV to 400 V Distribution Transformer | Dyn11 Vector Group
• 750 kVA 11 kV/0.4 kV Oil-Immersed Transformer | Compact Design, High Efficiency
• 800 kVA Pad-Mounted Transformer | Outdoor Rated, CSA Certified
• 1000 kVA 13.8 kV/0.4 kV Transformer | Suitable for Light Industry
• 1500 kVA 11 kV/415 V Distribution Transformer | For Heavy Industrial Applications
• 1600 kVA Copper-Wound Transformer | High Efficiency, Intelligent Design

 

Get More:Power Transformers: Definition, Types and Applications

 

 

Why Choose the 500 kVA 11 kV/0.4 kV Oil-Immersed MV Distribution Transformer?

GNEE's 500 kVA distribution transformer is engineered for the reliable operation of municipal power grids, commercial buildings and industrial distribution systems. This oil-immersed MV step-down transformer ensures stable voltage delivery from the main feeder (11 kV) to end-use low-voltage applications (400 V/415 V), enabling safe and efficient power distribution across industries.

 

Optimized for Medium-Voltage Distribution

This 500 kVA 11 kV/0.4 kV transformer is a critical component for stepping down utility voltage to meet local load demands. Ideal for hospitals, commercial districts and infrastructure sites, it ensures minimal voltage drop and stable power supply even under load fluctuations.

 

Durable Oil-Immersed Design with Proven Cooling Performance

Housed in a hermetically sealed oil-immersed tank and cooled by natural oil and air convection (ONAN), this transformer can withstand harsh indoor and outdoor environments. Robust bushings, anti-corrosive coatings and heat sinks ensure long-term, low-maintenance operation.

 

Fully Compliant with Global Electrical Standards

Every 500 kVA distribution transformer is designed and tested in accordance with IEC 60076, IEEE C57, ANSI and EN standards, and bears the CE mark. CSA or UL certifications are also available to meet international market requirements. Products are accompanied by Factory Acceptance Test (FAT) and type test documentation.

 

Configurable for Regional Grid and Load Requirements

Whether for North American or European power systems, we offer customizable primary/secondary voltages (10 kV–13.8 kV / 400 V–415 V), multiple vector group options (Dyn11, Yyn0, YNd11), and fixed or off-circuit tap changers for ±2.5% or ±5% voltage regulation.

 

Efficient Delivery and Engineering Support

Thanks to streamlined production processes and component sourcing, we ensure fast lead times (6–10 weeks) and offer door-to-door delivery across the US, Canada, UK, Germany, France and other regions. Our team of experts provides technical drawings, installation guides and application support.

 

Request A Quote

 

 

Request a quote for your 500 kVA oil-filled transformer today - whether for urban substations, commercial buildings, or renewable interconnection points. GNEE delivers consistent quality, flexible configurations, and competitive pricing for all your 500 kVA electrical transformer needs.

 

500 kVA 11kV/0.4kV Oil-Filled Electrical Distribution Transformer Technical Specs

No.	Item	Specification	Remark
1	Power Rating	500 kVA	Standard range: 100 kVA – 2500 kVA oil-immersed distribution transformers
2	Primary Voltage	11 kV (Delta)	Also available: 6.6 kV, 10.5 kV, 13.2 kV, 15 kV, 22 kV
3	Secondary Voltage	0.4 kV (Wye grounded)	Options: 0.415 kV, 0.33 kV, 0.208 kV based on local standards
4	Phase	Three-phase	Suitable for utility, commercial, and municipal grid use
5	Cooling Type	ONAN (Oil Natural Air Natural)	Efficient passive cooling for urban or rural installations
6	Core Material	CRGO silicon steel	Minimizes iron losses and improves magnetic performance
7	Insulation Fluid	Electrical grade mineral oil	IEEE/IEC-compliant with excellent thermal stability
8	Temperature Rise	55°C / 65°C options	Compliant with North American and European requirements
9	Enclosure Type	Outdoor sealed tank, IP44/IP54	Rust-resistant, anti-corrosion coating, tamper-proof design
10	Standards	IEC 60076, ANSI C57, CSA, EN 50588	Meets EU & North American grid compliance standards
11	Certifications	CE, UL, CSA, cUL, RoHS, ISO	Third-party testing for safety and performance
12	Connection Type	Delta – Wye grounded (standard)	Custom configurations: Delta-Delta, Wye-Wye, etc.
13	Applications	Industrial parks, data centers, local substations	Widely used in Canada, UK, Germany, Spain, Portugal
14	Protection Devices	Oil level gauge, pressure valve, temp gauge	Optional: surge arresters, drain valve, PRV
15	Dimensions & Weight	Customizable	Weight ~1200–1500 kg depending on spec
16	Energy Efficiency	DOE 2016 & EU Eco Design-compliant	Reduces operating losses and carbon emissions
17	Installation Method	Pad-mounted or pole-mounted	Includes lifting lugs and skid base for transport
18	Ambient Temperature Range	-25°C to +45°C	Arctic-ready versions available for -40°C
19	Total Transformer Loss	≤1.6% @ full load	Designed for long-term low-cost operation
20	No-Load Loss	≤ 0.3% of rated capacity	Helps improve energy savings in idle conditions
21	Load Loss	≤ 1.25% of rated power	Optimized for continuous load distribution
22	Impedance	5.5% typical	Custom range: 5% – 7% depending on design
23	Short-Circuit Strength	Withstands 25 kA for 2 sec	Mechanical integrity under fault conditions
24	Insulation Class	Class A (105°C)	Class F or B available for higher performance
25	Windings Material	Copper (standard) or Aluminum	Copper preferred for lower losses and longer life
26	Tap Changer	±2 x 2.5% Off-Circuit Tap Changer	OLTC available for automatic voltage adjustment
27	Bushings	Porcelain per ANSI standards	Polymeric bushings available for severe climates
28	Cooling Oil Volume	Approx. 350–400 liters	Depends on final tank size and rating
29	Transformer Lifespan	25–30 years average	Designed for high-reliability utility applications
30	Noise Level	≤ 58 dB at 1 meter	Urban-friendly acoustic design
31	Warranty	2 years standard	Optional 5-year extended support
32	Delivery Time	30–45 days	Fast delivery via sea or air freight
33	Custom Lead Time	60–75 days	Tailored builds per project specs
34	Price Range	Contact for quote	Based on copper content, specs, and certification level
35	Country of Origin	China	CE/UL/CSA-certified direct manufacturing supply