Medium Voltage Electrical Substation Transformer – 33/11kV, 2.5MVA to 6.3MVA, Copper Winding, Oil Type

Medium Voltage Electrical Substation Transformer – 33/11kV, 2.5MVA to 6.3MVA

The 33/11kV Medium Voltage Electrical Substation Transformer is engineered for stable, efficient voltage conversion in regional power grids and distribution networks. With a rated capacity from 2.5MVA to 6.3MVA, it features a 33kV Delta-connected primary and 11kV grounded Wye secondary. Built with copper windings, high-grade silicon steel cores, and oil-immersed insulation, this electrical substation transformer ensures low losses, high thermal stability, and reliable long-term performance in both 50Hz and 60Hz environments.

Each electrical substation transformer is manufactured in Energy Transformer's modern factory with full compliance to ANSI, IEEE, IEC, and GOST standards. Designed for outdoor installation, the unit includes a sealed tank, Buchholz relay, pressure relief valve, temperature sensors, and oil level indicators. The transformer is housed in a weatherproof enclosure to ensure safe operation even in harsh climates, supporting utilities and industrial applications in the Americas and Spanish-speaking regions.

As a leading Chinese manufacturer and global supplier, Energy Transformer offers wholesale and OEM solutions for electrical substation transformers across markets such as the United States, Canada, Mexico, Brazil, Argentina, Peru, Bolivia, Guyana, Panama, and Spain. With fast production cycles, bulk availability, and full technical support, we help customers reduce costs while ensuring grid stability and operational safety.

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33/11kV Medium Voltage Electrical Substation Transformer Technical Specs

No.	Specification Item	Details	Notes/Remarks
1	Product Type	Oil-Immersed Medium Voltage Substation Transformer	Designed for electrical substations
2	Rated Capacity	2.5 MVA – 6.3 MVA	Customizable within this power range
3	Phase	Three-Phase	Standard for utility distribution
4	Frequency	50 Hz (60 Hz optional)	Common in Americas
5	Primary Voltage (High Voltage)	33 kV	Customizable from 6 kV to 35 kV
6	Secondary Voltage (Low Voltage)	11 kV	Other LV voltages customizable
7	HV Winding Connection	Delta (Δ)	Optional configurations available
8	LV Winding Connection	Wye (Y) with grounded neutral	Preferred for safety and stability
9	Vector Group	Dyn11	Customizable
10	Tap Changer	±5% range, 2.5% steps	Off-load or on-load options
11	No-load Loss	Approx. 1.5 kW	Energy efficient design
12	Load Loss (at 75°C)	Approx. 12 kW	Low loss technology
13	Short Circuit Impedance	6% ±10%	Adjustable based on system requirements
14	Insulation Level HV Side	BIL 150 kV	Power frequency withstand 70 kV
15	Insulation Level LV Side	BIL 30 kV	Power frequency withstand 10 kV
16	Insulation Class	Class A or Class B	Optional
17	Max Temperature Rise	65°C standard / 55°C low loss	Relative to ambient temperature
18	Altitude Rating	Up to 1000 meters	Derating required for higher altitudes
19	Ambient Operating Temperature	-40°C to +50°C	Special designs available
20	Cooling Method	ONAN (Oil Natural Air Natural)	ONAF forced cooling optional
21	Short Circuit Duration	2 seconds	Designed for transient faults
22	Noise Level	≤ 55 dB at 1 meter	Meets NEMA TR1 and IEC 60076 standards
23	Core Construction	Step-lap laminated core	High-grade silicon steel
24	Winding Material	Copper (standard), Aluminum (optional)	Superior conductivity and reliability
25	Tank Type	Fully sealed steel tank	Conservator tank optional
26	Transformer Oil	Mineral oil IEC 60296 standard	Eco-friendly options available
27	Protection Rating	IP00 standard, IP23 optional	Suitable for indoor/outdoor use
28	Surface Finish	Sandblasting + primer + topcoat painting	Corrosion-resistant coating
29	Standard Accessories	Pressure relief valve, oil level gauge, thermometer, drain valve, grounding terminals	Complete standard configuration
30	Protection Devices	Buchholz relay (optional), pressure relief, temperature alarms	Customizable
31	Monitoring Options	Optional IoT smart monitoring (temperature, humidity, load)	Enables predictive maintenance
32	Termination Type	Cable box or porcelain bushings	Flexible connection options
33	Cooling Radiators	Bolted or welded type	Designed for efficient heat dissipation
34	Standards Compliance	IEC 60076, ANSI C57, IEEE C57, CSA C88, GOST	Certification upon request
35	Testing	Routine, type, special tests	100% inspection before shipment
36	Certifications	CE, UL, CSA, CUL, GOST	Market-specific certification
37	Dimensions (approx.)	2200 mm (L) × 1400 mm (W) × 1800 mm (H)	Subject to final design
38	Weight (approx., including oil)	4000 kg	–

✅ Medium Voltage Electrical Substation Transformer Overview

The 33/11 kV medium voltage electrical substation transformer, rated from 2.5 MVA to 6.3 MVA, is a three-phase oil-immersed transformer designed for efficient power step-down and distribution in industrial, utility, and commercial substations. Featuring copper windings and mineral oil insulation, this transformer delivers reliable, stable, and efficient performance suitable for harsh outdoor environments. Widely deployed across North and South America, it supports the growing demand for durable medium voltage transformers in smart grids, renewable energy, and heavy industry applications.

✅ Medium Voltage Electrical Substation Transformer Specifications

Standard features include ONAN cooling (Oil Natural Air Natural), ±5% tap changer with 2.5% steps (off-load or on-load), Dyn11 vector group, high-quality silicon steel core to reduce losses, and copper windings for optimal conductivity. Insulation and tank design comply with IEC 60076, ANSI C57, IEEE, UL, and CSA standards. These transformers meet DOE 2016 energy efficiency regulations and are designed for long service life and low maintenance.

✅ Medium Voltage Electrical Substation Transformer Amperage

With a primary voltage of 33 kV and secondary of 11 kV, these transformers deliver stable output currents suited for heavy motor loads, commercial buildings, mining, and renewable energy plants. Copper windings ensure high ampacity with minimal losses, enabling efficient load handling and superior thermal stability.

✅ Medium Voltage Electrical Substation Transformer Dimensions

Typical dimensions range from 2200 mm (length) × 1400 mm (width) × 1800 mm (height), optimized for installation in both urban substations and industrial facilities. Compact design allows easier integration with existing infrastructure, and custom sizes are available on request.

✅ Medium Voltage Electrical Substation Transformer Weight

Weight varies between 3500 kg and 5500 kg depending on capacity and design features. This impacts shipping, handling, and foundation requirements, with heavier units providing enhanced mechanical strength and overload resilience.

✅ Medium Voltage Electrical Substation Transformer Enclosure

Equipped with fully sealed, corrosion-resistant steel tanks painted with UV-resistant coatings. Standard IP23 ingress protection is provided, with options for IP54 or higher for more severe conditions. The enclosure protects against moisture, dust, rodents, and harsh weather.

✅ Medium Voltage Electrical Substation Transformer Installation

ENERGY TRANSFORMER provides full installation support including site preparation, grounding, pad construction, and cable termination guidance. Units arrive factory-tested, oil-filled, sealed, and ready for plug-and-play operation, compatible with loop or radial feed configurations.

✅ Medium Voltage Electrical Substation Transformer Windings

Copper windings are standard, providing superior conductivity and thermal endurance. Aluminum winding options are available for cost-effective alternatives. All windings are vacuum-dried, resin impregnated, and thermally upgraded to ensure durability.

✅ Medium Voltage Electrical Substation Transformer Efficiency

Designed to meet DOE 2016 and CSA C802.1 standards, featuring low no-load and load losses thanks to premium silicon steel core laminations and optimized winding geometry. Improved efficiency reduces operational costs and carbon footprint.

✅ Medium Voltage Electrical Substation Transformer Certifications

Certified to IEC 60076, ANSI C57, IEEE C57, UL, CSA, and NEMA standards. Each unit undergoes routine, type, and special testing with documentation available for export compliance and engineering approvals.

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✅ Medium Voltage Electrical Substation Transformer Applications

Ideal for utility substations, industrial power distribution, commercial facilities, solar and wind farms, and mining operations across North and South America. Designed for diverse load profiles and environmental conditions.

✅ Medium Voltage Electrical Substation Transformer Voltage & Tap Options

Primary voltage standard at 33 kV, adjustable from 6 kV to 35 kV. Secondary voltage at 11 kV, customizable upon request. Tap changers provide ±5% adjustment in 2.5% steps, with off-load or on-load options.

✅ Medium Voltage Electrical Substation Transformer For Sale

ENERGY TRANSFORMER stocks 2.5 MVA to 6.3 MVA 33/11 kV oil-immersed transformers, ready for export to North America, Central America, and South America. Competitive pricing, fast lead times (30–45 days), and flexible OEM/ODM services available.

✅ Medium Voltage Electrical Substation Transformer Price

Factory prices range from $18,000 to $45,000 USD depending on configuration, certifications, and shipping. Contact us for a customized quote with CIF options to Houston, Los Angeles, Panama City, Buenos Aires, Lima, and other major ports.

✅ Medium Voltage Electrical Substation Transformer Manufacturers (USA, China, Global)

ENERGY TRANSFORMER is a leading Chinese manufacturer providing UL-listed, CSA-compliant oil-immersed transformers to the Americas market. We offer flexible minimum orders, fast delivery, and full customization to meet client-specific technical and regulatory requirements.

✅ Medium Voltage Electrical Substation Transformer Wholesale Supply

We support bulk orders for contractors, distributors, and government tenders. Our production capacity ensures OEM branding, full standards compliance, and door-to-door logistics. Other capacities like 500 kVA, 1500 kVA, and 100,000 kVA transformers are also available.

✅ Related Transformer Models

• 500 kVA to 1500 kVA Medium Voltage Pad-Mounted Transformers

• Dry-Type Medium Voltage Transformers

• Solar Inverter Transformers and Custom Cast Resin Transformers

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Medium Voltage Substation Transformers: Electromagnetic Wire Production & Finished Product Logistics

Why Choose Energy Medium Voltage Substation Transformer – 33/11kV, 2.5MVA to 6.3MVA
Energy Transformer's medium voltage electrical substation transformers, rated from 2.5MVA to 6.3MVA with 33/11kV voltage ratings, are designed for reliable power distribution across commercial, industrial, and utility networks throughout North and South America. Featuring copper windings and oil-immersed cooling, these transformers efficiently step down voltage while ensuring operational safety and durability.

Built to withstand demanding outdoor environments, each unit is housed in a robust, weather-resistant enclosure with sealed oil tanks filled with environmentally friendly insulating oil. This construction provides excellent protection against harsh weather, contaminants, and mechanical impact, guaranteeing a long service life.

Key advantages include:

• High Efficiency and Compliance: Designed to meet ANSI, IEEE, IEC, UL, and CSA standards for optimal performance and regulatory adherence.

• Versatile Installation: Suitable for various substation configurations, including radial and loop feed systems, with customizable tap changers and connection options.

• Customizable Options: Copper winding standard, with tailored voltage ratios, tap changer settings, protection devices, and mounting configurations to fit specific project requirements.

• Low Noise and Reliable Operation: Engineered for quiet performance and stable load handling, ideal for urban substations, industrial zones, and renewable energy integration.

• Global Market Ready: Manufactured to comply with North and South American electrical standards and certifications, supporting deployment in the U.S., Canada, Mexico, Brazil, Argentina, Peru, and beyond.

Whether serving utility substations, industrial parks, renewable energy projects, or large commercial facilities, Energy Transformer's 33/11kV, 2.5MVA to 6.3MVA oil-immersed transformers provide dependable, efficient, and customizable solutions for your medium voltage power distribution needs.

Contact us today for pricing, stock availability, or to request a customized quote tailored to your substation transformer project.