2500 kVA Substation Step-Down Transformer | 33kV to 11kV Oil-Filled Power Transformer

2500 kVA Substation Step-Down Transformer For Sale

Engineered for high-reliability power conversion, the 2500 kVA 3-phase oil-filled substation transformer delivers precise voltage step-down from 33 kV to 11 kV, making it a versatile solution for industrial zones, power infrastructure projects, and public utility networks across the Americas.

Recently, one of our long-standing clients—a large-scale data center operator in Texas—required a compact and robust substation unit for a critical grid expansion. We custom-engineered a 2500 kVA transformer featuring a Delta-connected 33 kV high-voltage primary and a grounded Wye 11 kV secondary output. The result: seamless integration into their medium-voltage distribution network with zero unplanned downtime.

Built with precision-wound copper coils and top-grade laminated silicon steel, this ONAN-cooled transformer ensures optimized thermal dissipation, low no-load and load losses, and consistent performance under variable load conditions. Whether operating at 50 Hz or 60 Hz, it supports efficient and long-term operation in both utility-scale and industrial-grade environments.

The transformer is housed in a heavy-duty weatherproof enclosure designed for outdoor substations, featuring integrated safety components such as gas relays, pressure relief devices, oil temperature indicators, and liquid level alarms. Every unit undergoes thorough type and routine testing in accordance with ANSI, IEEE, CSA, IEC, and UL standards.

Learn More:3500 kVA 3-Phase Substation Transformer for Sale

2500 kVA Substation Step-Down Transformer Technical Specs

No.	Specification Item	Details	Notes/Remarks
1	Product Type	Three-Phase Oil-Filled Substation Transformer	Built for reliable medium-voltage step-down applications
2	Rated Capacity	2.5 MVA	Available up to 6.3 MVA upon request
3	Phase	3-Phase	Ideal for industrial and utility-scale deployment
4	Frequency	60 Hz (standard), 50 Hz optional	Dual-frequency support for global compatibility
5	Primary Voltage (HV)	33 kV	Configurable from 6 kV to 36 kV depending on system
6	Secondary Voltage (LV)	11 kV	Additional secondary voltages available
7	HV Winding Connection	Delta (Δ) connection	Other winding arrangements available
8	LV Winding Connection	Grounded Wye (Y)	Designed to enhance operational grounding and safety
9	Vector Group	Dyn11 (default)	Can be adjusted per grid code
10	Tap Changer	±5%, adjustable in 2.5% steps	Manual (off-circuit) or automatic (on-load) options
11	No-load Loss	Approx. 1.2 kW	Optimized for minimal idle energy usage
12	Load Loss (at 75°C)	Approx. 9.5 kW	Efficient under full rated load
13	Short Circuit Impedance	6.5% ±10%	Engineered for fault-tolerant operation
14	HV Insulation Level	BIL 170 kV	AC withstand voltage: 70 kV
15	LV Insulation Level	BIL 36 kV	AC withstand voltage: 10 kV
16	Insulation Class	Class A (standard), Class B optional	Tailored to site conditions
17	Max Temperature Rise	65°C typical, 55°C optional	Referenced to ambient 40°C
18	Altitude Rating	Up to 1000 m	Contact us for high-altitude applications
19	Ambient Temperature Range	-45°C to +55°C	Custom designs for harsh climates available
20	Cooling Method	ONAN; ONAF available	Supports both passive and forced-air options
21	Short Circuit Endurance	2 seconds	Fully tested per IEC/ANSI for thermal withstand
22	Noise Emission	≤ 55 dB @ 1 meter	Designed to meet low-noise operation standards
23	Core Technology	Step-lap CRGO silicon steel	High efficiency and low magnetizing current
24	Winding Material	Copper standard; aluminum by request	Excellent conductivity and mechanical strength
25	Tank Construction	Hermetically sealed steel tank	Optional conservator design for expansion control
26	Insulating Oil	Mineral oil compliant with IEC 60296	Biodegradable oil options available
27	Enclosure Protection	IP00 standard; IP23 optional	Indoor/outdoor ready
28	Surface Treatment	Rust-proof paint with anti-corrosion coating	Multi-layer finish for extended service life
29	Standard Accessories	Oil gauge, thermometer, PRV, drain, earthing lugs	Standard on all models
30	Protection Features	Optional Buchholz relay, temp sensors, gas release	Upgradeable safety package
31	Monitoring Integration	Smart sensors for load, oil temp, humidity	Supports SCADA and IoT networks
32	Terminal Type	Cable boxes or bushings	Application-based configuration
33	Cooling Radiator	Welded or bolted types	Ensures proper thermal dissipation
34	Standards Compliance	ANSI, IEEE, IEC 60076, CSA	Certification support on request
35	Testing Scope	Routine, type, special test options	All units factory-tested and documented
36	Approvals	UL, CSA, CE, CUL, EAC	Export-ready across North & South America
37	Dimensions (Typical)	2250 mm (L) × 1400 mm (W) × 1800 mm (H)	May vary depending on final spec
38	Weight (Approx.)	3900–4200 kg including oil	Final weight based on configuration

✅ 2500 kVA Substation Step-Down Transformer Overview

The 2500 kVA 3-phase oil-immersed substation transformer offers high-performance voltage conversion from 33kV to 11kV. Engineered for medium-voltage power networks, it ensures dependable operation across utility, industrial, and renewable energy systems. Designed with copper windings and mineral oil insulation, this transformer is built to withstand heavy-duty environments across the Americas.

✅ Flexible Capacity Options in Medium Voltage Distribution

Beyond the 2500 kVA rating, Energy Transformer manufactures a complete lineup of oil-filled substation transformers ranging from 2000 kVA to 10 MVA. Standard options include 3000 kVA, 4000 kVA, 5000 kVA, and larger custom-built models to meet varying energy distribution requirements in commercial and grid-level applications.

✅ Key Technical Features of 2500 kVA Units

Each unit includes ONAN cooling, ±5% voltage regulation via off-load or on-load tap changer, and Dyn11 vector group by default. Core losses are minimized with step-lap laminated silicon steel, while high-conductivity copper ensures low-resistance windings. Compliance with ANSI, IEEE, CSA, and IEC 60076 standards ensures safe, energy-efficient operation.

✅ Voltage Ratings & Load Capacity

Primary input voltage is 33kV (Delta), while the secondary output is 11kV (Wye-grounded). This setup supports a wide range of power delivery scenarios in substations, solar farms, and industrial campuses. Copper windings are engineered to handle heavy load cycles while maintaining stable temperature performance.

✅ Approximate Dimensions & Weight by Capacity

For design and logistics planning, standard sizing includes:

• 2500 kVA: approx. 2200 mm × 1350 mm × 1750 mm; ~3900 kg

• 3000 kVA: approx. 2300 mm × 1400 mm × 1800 mm; ~4300 kg

• 5000 kVA: approx. 2600 mm × 1600 mm × 2000 mm; ~5600 kg

Dimensions can be adjusted based on cooling type, accessories, and transport constraints.

✅ Weatherproof Enclosure & Safety Features

Units come with a sealed steel tank and IP23 weatherproof rating, suitable for outdoor installation. Protective devices include a pressure relief valve, oil level gauge, thermometer, and optional Buchholz relay. UV-resistant coatings prevent corrosion in coastal or high-exposure regions.

Read More:6000 kVA 33kV to 11kV Oil Filled Substation Transformer – Copper Windings

✅ Full Support for Delivery & Installation

Energy Transformer provides end-to-end service including pad layout consulting, cable termination guidance, and installation training. All products are pre-tested and shipped ready for on-site integration across the U.S., Canada, Brazil, Chile, and other Latin American markets.

✅ Cooling System & Conductor Options

Standard ONAN (Oil Natural Air Natural) cooling ensures passive thermal management. For higher ambient temperatures or loads, ONAF forced cooling is available. Copper windings are standard, with aluminum options available to meet project-specific budgets.

✅ Certifications & Quality Assurance

Every 2500 kVA unit is tested per IEEE/ANSI/CSA standards. Certifications include UL, cUL, CE, and IEC 60076 compliance. Routine, type, and special tests are conducted before shipment, with complete documentation for international approval.

✅ Insulation System & Dielectric Performance

Equipped with premium mineral insulating oil complying with IEC 60296, the transformer ensures superior thermal and dielectric stability. Key insulation parameters include:

• HV Side: BIL 170 kV, withstand voltage 70 kV

• LV Side: BIL 36 kV, withstand voltage 10 kV

• Insulation Class A standard, with optional upgrades to Class B or F for elevated temperature operation

✅ Secondary Amps for 2500 kVA Transformer

Correct sizing of secondary current is critical for system design and safety compliance. For the 2500 kVA transformer:

• At 11 kV secondary (3-phase):
  Secondary current ≈ 131 A

• At 480Y/277 V secondary (low-voltage version):
  Secondary current ≈ 3,006 A

Understanding these amperage ratings helps with proper cable sizing, breaker selection, and grounding.

Learn More:2500 kVA Pad Mounted Transformer – 13.8kV to 480Y/277V, 3 Phase Oil-Filled Outdoor Unit | Utility-Grade ANSI Design

✅ Applications Across Sectors

Ideal for:

• Medium voltage substations

• Grid connection points

• Wind and solar energy integration

• Oil & gas and mining operations

• Industrial parks and manufacturing sites

✅ Factory Direct Supply & Price Range

Energy Transformer offers competitive factory-direct pricing, low MOQs, and fast lead times. Typical 2500 kVA transformer price ranges from $18,000 to $32,000 USD, depending on specification and delivery terms (FOB or CIF). Bulk discounts and OEM branding available.

✅ Your Trusted Transformer Manufacturer

As a CSA- and UL-approved transformer factory, Energy Transformer delivers proven quality and reliable performance across the Americas. Our dedicated engineering and logistics teams support your project from design to commissioning—ensuring peace of mind and on-time delivery.

✅ Related Products

• 2000 kVA–20 MVA Step-Down Substation Transformers

• Pad-Mounted Oil-Filled Distribution Transformers

• 33kV to 13.8kV, 11kV, 12.47kV Standard Models

• Transformers for Wind, Solar, and Hybrid Energy Systems

Read More:What Is a Substation Transformer? A Practical Guide for Power Projects

Why Choose Energy Transformer's 2500 kVA Substation Step-Down Transformer

Energy Transformer's 2500 kVA step-down transformer is engineered to provide reliable and efficient voltage conversion from 33kV to 11kV, meeting the demanding needs of utility, industrial, and commercial power systems throughout North and South America. Constructed with high-purity copper windings and filled with premium insulating oil, this unit ensures excellent thermal management and long-lasting durability.

Designed for outdoor use, the transformer features a rugged, weatherproof steel enclosure that protects against harsh environmental factors such as humidity, dust, and temperature extremes. This robust build ensures consistent performance in diverse climates and operating conditions.

Core Advantages:

• Superior Energy Efficiency & Compliance: Manufactured in accordance with CSA, UL, IEC 60076, ANSI, and IEEE standards, delivering low losses and meeting regional regulatory requirements.

• Adaptable Installation & Configurations: Supports various wiring arrangements and vector groups, equipped with versatile tap changer options for precise voltage regulation tailored to your system design.

• Custom Engineering Options: Standard copper windings with flexible voltage ratings, enhanced protection features, and multiple mounting configurations to suit unique project specifications.

• Low Noise & Reliable Operation: Optimized for minimal acoustic emissions and steady load management, ideal for both urban substations and remote industrial sites.

• Certified for Regional Use: Fully approved for deployment across the Americas including the United States, Canada, Mexico, Brazil, Argentina, and Peru, facilitating smooth project execution and compliance.

Whether you are modernizing existing substations, integrating renewable energy sources, or supporting large-scale industrial power needs, Energy Transformer's 2500 kVA 33kV to 11kV step-down transformer offers a dependable and efficient solution built for the Americas market.

Contact us for competitive pricing, availability, and tailored support to ensure your next transformer project meets all performance and regulatory goals.