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

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

The 500 kVA electrical distribution transformer (oil-filled, 3-phase) is engineered to deliver dependable voltage conversion in commercial, industrial, and public utility environments across North America and Europe. Rated at 500 kVA, this medium voltage transformer supports reliable 11kV to 0.4kV step-down operation, ideal for low-voltage load centers in municipal grids, logistics parks, residential substations, and manufacturing plants.

The unit features a robust Delta-connected 11kV primary winding and grounded Wye 0.4kV secondary output. Custom voltage configurations—such as 10.5kV/415V or 12kV/400V—can be provided to meet local distribution code requirements across the United States, UK, Canada, Germany, and France. The core utilizes cold-rolled grain-oriented silicon steel for minimized core losses, while high-conductivity copper windings ensure low-temperature rise and optimized short-circuit resistance.

Encased in a weatherproof, hermetically sealed steel tank, the 500 kVA oil-immersed transformer is filled with degassed mineral insulating oil and designed for indoor and outdoor installation. The standard ONAN cooling system supports quiet, maintenance-friendly thermal management, with optional radiator extensions available for high ambient environments.

In 2023, multiple units of this 500 kVA distribution transformer were installed in a Canadian school district to modernize outdated utility substations. With smart load balancing and consistent voltage regulation during peak winter demand, they've demonstrated stable performance and improved energy efficiency under IEC and ANSI operating conditions.

All Energy Transformer products comply with IEC 60076, ANSI C57, CSA C2.1, and EN 50588 standards. Each 500 kVA medium voltage transformer undergoes routine testing including vector group confirmation, impulse withstand, temperature rise, and insulation resistance—ensuring long-term grid reliability and safety.

OEM and ODM options are available, supporting tailored branding and bulk transformer manufacturing for global EPC contractors and regional power suppliers. Energy Transformer serves core markets including the USA, Canada, UK, Germany, France, Netherlands, Spain, Italy, Portugal, and Australia.

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

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

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 (Energy Transformer Factory)	CE/UL/CSA-certified direct manufacturing supply

✅ 500 kVA 11kV/0.4kV Oil-Filled Electrical Distribution Transformer Overview

The 500 kVA 11kV/0.4kV oil-immersed distribution transformer is a medium-voltage step-down unit used to supply low-voltage electricity for residential, commercial, and light industrial loads. Engineered for long-term reliability, these transformers step voltage down from primary distribution levels (typically 11kV) to 400V (or 415V) three-phase output for local networks. Designed for outdoor or pad-mount installation, each unit is built to IEC, IEEE, ANSI, and EN standards.

✅ Standard Ratings for 500 kVA Medium Voltage Transformers

Our 500 kVA electrical distribution transformers are manufactured with standard input voltages such as 11kV, 10kV, or 13.8kV, and secondary voltages of 400V or 415V. They are offered in both Dyn11 and Yyn0 vector group configurations, tailored to suit regional grid topologies. Units are available with ONAN cooling, oil temperature monitoring, and overload handling as per IEC 60076 and IEEE C57 guidelines.

✅ Application Scenarios for 500 kVA Step-Down Transformers

Commonly deployed in urban substations, industrial parks, commercial complexes, hospitals, schools, and rural electrification projects, the 500 kVA oil-filled transformer is essential in medium-voltage to low-voltage network transitions. They support steady load conditions and minor surges, with high insulation strength and environmental resistance.

✅ Transformer Dimensions and Space Planning

A typical 500 kVA 11kV/0.4kV transformer has compact dimensions: approximately 1.5–2.2 meters long, 1.1–1.3 meters wide, and 1.5–1.8 meters high, depending on the cooling type and accessories. We provide base plate and lifting drawings to support civil engineering and layout design for your distribution project.

✅ Weight and Transport of 500 kVA Oil-Immersed Transformers

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

✅ Pricing Considerations for 500 kVA Distribution Transformers

The cost of a 500 kVA electrical distribution transformer varies based on core type (CRGO vs amorphous), copper vs aluminum windings, tap changer options, and regional compliance needs. Standard prices range from $7,000 to $12,000 USD (EXW), with additional options for customized terminals, bushings, and enclosures.

✅ Load Current and Technical Reference

Use the formula: Current (A) = (kVA × 1000) / (√3 × Voltage). For a 500 kVA unit at 400V output, full load current is around 721A. We include nameplate data and secondary current specs for CT/relay selection and protective equipment calibration.

✅ Installation Guidelines for 500 kVA Transformers

Install on a concrete pad or plinth with grounding provisions, oil containment trench, and lightning arresters. Our transformers come with drain valves, thermometer pockets, oil level indicators, earthing terminals, and comply with utility or industrial site protocols. Optional site support is available for commissioning and insulation resistance testing.

✅ Oil Tank Construction and Protection Features

Each 500 kVA unit includes a sealed steel tank with anti-rust coating and welded joints. Models may feature a conservator tank with silica gel breather, pressure relief valve, and thermometer + oil level gauge. Internal protection includes winding temperature detectors and optional Buchholz relay for enhanced fault monitoring.

✅ Voltage Classes and Vector Group Customization

Standard primary voltage: 11kV. Secondary voltage: 400V or 415V. Popular vector groups: Dyn11, Yyn0, or YNd11, selected based on grounding and harmonic requirements. Tap changers (±2.5% or ±5%) can be provided for voltage regulation under varying load profiles.

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✅ Copper vs. Aluminum Windings for 500 kVA Transformers

Copper windings provide higher thermal endurance and better short-circuit resistance, while aluminum is lighter and more economical. Both winding types are manufactured using automatic layer winding machines, vacuum drying, and multi-layer insulation compliant with IEC and IEEE standards.

✅ Transformer Efficiency and Core Losses

Our 500 kVA distribution transformers achieve typical efficiency >98.8% at full load. No-load losses are around 700–900 watts, and load losses are kept under 6,000 watts. We use cold-rolled grain-oriented silicon steel and design optimized magnetic flux paths to reduce total ownership cost.

✅ Standards and Quality Certifications

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

✅ Nameplate and Documentation Package

Every unit includes a stainless steel nameplate showing power rating, voltages, frequency, winding material, cooling method, vector group, weight, and oil volume. Documentation includes type test results, schematic wiring diagrams, and bilingual technical manuals in English and French or English and Spanish.

✅ Worldwide Shipping and Support

We ship 500 kVA oil-immersed electrical distribution transformers to North America, Europe, Southeast Asia, the Middle East, and Africa. Our global logistics team ensures compliant packing, route planning, and customs clearance support. Technical assistance and warranty services available through our global partner network.

✅ Alternative Supplier Option: VOLTEX TRANSFORMERS

VOLTEX TRANSFORMERS, an experienced manufacturer of 500 kVA 11kV/0.4kV oil-filled transformers, offers tailored solutions for utilities and EPCs across the EU and North America. With advanced design centers and ISO-certified facilities, VOLTEX provides cost-effective, grid-compliant units with rapid production and delivery timelines.

✅ Related Distribution Transformer Solutions

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

Read More:Electrical Power Transformers: Definition, Types, and Applications

Why Choose 500 kVA 11kV/0.4kV Oil-Filled Medium Voltage Electrical Distribution Transformer?

Energy Transformer's 500 kVA electrical distribution transformer is engineered for dependable performance in municipal grids, commercial buildings, and industrial distribution systems. This oil-immersed medium-voltage step-down transformer ensures stable voltage delivery from primary feeders (11kV) to end-use low-voltage applications (400V/415V), enabling safe and efficient power distribution across sectors.

✅ Optimized for Medium Voltage Power Distribution

The 500 kVA 11kV/0.4kV transformer is a key component in stepping down utility voltage for local loads. Ideal for hospitals, commercial zones, and infrastructure sites, it ensures minimal voltage drop and consistent supply, even in fluctuating load conditions.

✅ Durable Oil-Immersed Design with Proven Cooling Performance

Housed in a sealed oil-filled tank and cooled via natural air and oil convection (ONAN), this transformer is built to withstand demanding indoor and outdoor environments. Robust bushings, anti-corrosion coatings, and radiator fins enable long-term, low-maintenance operation.

✅ Fully Compliant with Global Electrical Standards

Each 500 kVA distribution transformer is designed and tested to meet IEC 60076, IEEE C57, ANSI, and EN standards, with CE marking and optional CSA or UL certification for international markets. Factory acceptance tests (FAT) and type testing documentation are included.

✅ Configurable for Regional Grid and Load Requirements

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

✅ Efficient Delivery & Engineering Support

Thanks to streamlined production and component sourcing, we ensure fast turnaround (6–10 weeks) and door-to-door delivery across the US, Canada, UK, Germany, France, and beyond. Technical drawings, installation guides, and application support are available from our expert team.

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