15 MVA 132kV/33kV Substation Power Transformer CE / UL Listed Export to Europe & USA

15 MVA 132kV/33kV Substation Power Transformer — Exported to Europe & North America

Engineered for reliable and efficient power transformation, this 15 MVA 132kV/33kV substation transformer is designed to meet the stringent demands of modern electrical grids across Europe and North America. Certified with CE and UL standards, it ensures compliance with international safety and performance regulations, making it an ideal choice for utility substations, industrial facilities, and renewable energy projects.

In response to the increasing demand from a leading European utility facing the challenge of upgrading an aging substation that supplies a growing metropolitan area, our team delivered a customized 15 MVA transformer featuring a Wye-grounded secondary configuration. This solution effectively manages peak load conditions while minimizing downtime, seamlessly integrating with existing grid infrastructure.

Built with precision copper windings and high-quality silicon steel cores, this transformer delivers excellent voltage regulation and superior thermal performance. The ONAN (Oil Natural Air Natural) cooling system optimizes heat dissipation, enhancing durability and simplifying maintenance.

Encased in a rugged, weather-resistant steel enclosure, the unit withstands harsh environmental conditions. Equipped with pressure relief devices, oil temperature monitoring, and gas-actuated protection systems, it guarantees safe and continuous operation.

Flexible vector group options and customizable tap changers allow precise voltage adjustment to meet varying grid requirements. Comprehensive factory testing complies with IEC, ANSI, IEEE, CSA, and UL standards, assuring premium quality.

Energy Transformer offers factory-direct supply and wholesale availability to customers in the USA, Canada, the UK, Germany, France, the Netherlands, Spain, Italy, Australia, Portugal, and other key markets—providing dependable solutions for evolving power infrastructure needs.

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

15 MVA 132kV/33kV Substation Power Transformer Technical Specs

No.	Specification Item	Details	Notes/Remarks
1	Product Type	High-Voltage Three-Phase Substation Transformer	Designed for grid-level voltage step-down applications
2	Rated Capacity	15 MVA	Range: 10 MVA to 40 MVA available
3	Operating Phase	Three-phase	For balanced industrial and utility systems
4	System Frequency	60 Hz standard; 50 Hz optional	Dual-frequency adaptable
5	Primary Voltage (HV)	132,000 V	Configurable for 110–150 kV primary grids
6	Secondary Voltage (LV)	33,000 V	Alternative voltage levels on request
7	HV Connection Type	Delta (Δ)	Common for transmission-side winding
8	LV Connection Type	Grounded Wye (Yg)	Improves system fault tolerance
9	Vector Group	Dyn1, Dyn11 standard	Optional configurations: YNd1, Dd0, etc.
10	Tap Changer	±10%, 1.25% per step (OLTC or NLTC)	On-load or off-load tap adjustment options
11	No-Load Loss	Approx. 6.5 kW	Subject to core design and flux density
12	Load Loss (at 75°C)	Approx. 38 kW	Measured at rated load
13	Short-Circuit Impedance	10.5% ± 10%	Suitable for fault-limiting and voltage drop control
14	HV Insulation Level	BIL 650 kV, Power Frequency: 275 kV	Based on IEC/IEEE standards
15	LV Insulation Level	BIL 170 kV, Power Frequency: 70 kV	Optimized for medium-voltage systems
16	Insulation Class	Class OA (105°C), optional Class A/B	Long-life thermal design
17	Temperature Rise	Max 65°C over 40°C ambient	55°C option for higher efficiency available
18	Altitude Capability	≤ 1000 m without derating	Custom cooling for higher elevations
19	Ambient Operating Range	-40°C to +50°C	Arctic/hot-zone options available
20	Cooling Type	ONAN standard; ONAF optional	Passive or forced-air depending on load requirements
21	Short-Circuit Withstand	2 seconds thermal withstand	Verified per IEC/IEEE 60076 Part 5
22	Noise Level	≤ 65 dB(A) @ 1 meter	Compliant with ISO 3744 standards
23	Magnetic Core	Cold-rolled grain-oriented steel, step-lap construction	Low core loss, low inrush current
24	Conductor Material	Electrolytic copper (standard)	Aluminum optional upon request
25	Tank Design	Fully sealed or conservator-type oil tank	Anti-leakage welded structure
26	Insulating Fluid	Mineral oil per IEC 60296	Optional: silicone, ester-based, biodegradable fluids
27	Enclosure Rating	IP23 standard; IP44/IP55 on request	Suitable for outdoor installations
28	Paint & Coating	Multi-layer anti-corrosion epoxy system	Salt spray and UV resistant
29	Standard Accessories	Drain valve, oil level indicator, thermometer, PRD	Pre-installed and tested
30	Optional Protections	Buchholz relay, WTI, OTI, pressure relief, gas sensor	Can be integrated with control panels
31	Digital Monitoring	IoT-ready with SCADA/BMS integration	Load current, temp, moisture, partial discharge sensors
32	Terminals	Porcelain bushings or cable boxes	HV and LV configurations customizable
33	Radiator System	Bolt-on or fully welded cooling fins	Surface area optimized for thermal performance
34	Applicable Standards	IEC 60076, ANSI C57, IEEE, CSA C88, EN 50588	Designed and tested to meet global requirements
35	Testing Protocol	Routine, type, and special testing fully supported	Factory witness testing available
36	Certification & Approval	UL, CE, CSA, cUL, EAC	Export-ready for EU, North America, EAEU
37	Approx. Dimensions	3800 mm (L) × 2300 mm (W) × 2600 mm (H)	Varies per cooling and protection features
38	Estimated Weight	13,000–15,000 kg including oil	Final weight based on design configuration

✅ 15 MVA Substation Power Transformer Overview

The 15 MVA 132kV/33kV substation power transformer is purpose-built for high-voltage step-down applications in modern power networks. With CE and UL certifications, this oil-filled three-phase transformer offers safe and stable operation for critical utility infrastructure, renewable energy systems, and industrial grid connections across Europe, the U.S., and Canada.

✅ Scalable Power Options for Transmission & Distribution

In addition to 15 MVA units, Energy Transformer manufactures a full range of high-voltage substation power transformers from 10 MVA to 40 MVA. Common configurations include 20 MVA, 25 MVA, and 30 MVA oil-immersed transformers—customized to meet varying system voltages and load requirements for grid and substation projects.

✅ Key Technical Specifications of 15 MVA Transformers

Each unit features ONAN cooling as standard, ±10% voltage regulation via off-load or on-load tap changers, and Dyn11 vector group for optimal load balancing. Core losses are minimized with step-lap CRGO silicon steel, while precision copper windings ensure maximum conductivity and mechanical durability. All designs conform to IEC 60076, IEEE C57, CSA, and UL standards.

✅ High Voltage Ratings for Utility-Grade Applications

Primary: 132kV (Delta)
Secondary: 33kV (Wye-grounded)
This 132/33kV voltage rating supports substation-level transformation across regional transmission networks and renewable integration zones. Designed to withstand fluctuating loads and long-duration operating cycles.

✅ Approximate Size & Weight (Based on Base Model)

• 15 MVA: approx. 4200 mm × 2600 mm × 3200 mm
• Weight: ~16,000–18,000 kg including insulating oil
Dimensions vary by enclosure type, cooling configuration, and protection accessories.

✅ Substation-Ready Outdoor Enclosure

The transformer is enclosed in a hermetically sealed, hot-dip galvanized steel tank with IP23 protection for harsh outdoor use. Anti-corrosion coatings and UV-stabilized paints ensure long-term durability in humid, coastal, or high-salinity areas. Optional IP44/IP55 upgrade available for enhanced ingress protection.

✅ Installation & Technical Support Services

We offer full engineering assistance for European and North American grid connections, including primary/secondary terminal layout, civil pad drawings, and installation guidelines. Our field engineering team supports factory acceptance testing (FAT), commissioning, and remote troubleshooting.

✅ Cooling System & Conductor Options

Standard cooling: ONAN (Oil Natural Air Natural)
Optional: ONAF (Oil Natural Air Forced) for high-load/high-temperature environments
Copper windings are standard; aluminum options are available for cost-optimized projects. Radiator design can be customized (bolted or welded) to match ambient and installation conditions.

✅ Certifications & Global Compliance

Each substation power transformer undergoes full type, routine, and special testing. Certifications include:
✔ CE (Europe)
✔ UL / cUL (USA / Canada)
✔ CSA C88.1
✔ IEC 60076
✔ IEEE C57
✔ SGS / ISO 9001 & 14001 compliant manufacturing

✅ Insulation & Dielectric Strength

Insulating fluid: mineral oil per IEC 60296 (biodegradable options on request)
Insulation class: A (standard), Class B or F optional
Dielectric performance:
• HV Side – BIL 650 kV, 275 kV AC withstand
• LV Side – BIL 170 kV, 70 kV AC withstand
Each unit is designed for long life under continuous electrical, thermal, and environmental stress.

✅ 132kV to 33kV Transformer Current Ratings (Secondary Amps)

At 33kV secondary (3-phase):
15,000 kVA ÷ (√3 × 33kV) ≈ 262.5 A
This information is critical for cable sizing, breaker selection, and protection coordination during substation design.

✅ Target Applications for 15 MVA Substation Power Transformers

• 132kV to 33kV step-down in primary substations
• Transmission to distribution voltage conversion
• Renewable energy substations (wind, solar, hybrid)
• Utility-scale battery storage stations
• Industrial power plants and energy export points

✅ Factory Supply, Delivery & Pricing Information

Energy Transformer supports DDP, FOB, and CIF shipments to ports across Europe and North America. Typical 15 MVA substation power transformer price ranges from $65,000 to $115,000 USD, depending on configuration and compliance. Lead times: 8–14 weeks. Bulk orders, EPC discounts, and OEM branding are available.

✅ Explore Related Products

• 10–40 MVA Oil-Immersed Substation Transformers
• 132kV to 66kV, 33kV, 11kV, 22kV voltage classes
• Transformers for offshore wind and utility-scale solar farms
• High-Voltage Pad-Mounted Transformers for Distribution Use

Popular Medium Voltage Substation Power Transformers:
• 2.5 MVA 33kV to 11kV Oil-Filled Substation Transformer
• 3 MVA 33kV/11kV Substation Step-Down Transformer
• 3.5 MVA 34.5kV to 13.8kV Grid Power Transformer
• 4 MVA Medium Voltage Oil-Immersed Transformer
• 5 MVA Substation Transformer – 66kV/11kV Configuration Available
• 6 MVA 132kV/33kV High Voltage Substation Power Transformer
• 7 MVA 33kV/11kV Substation Oil-Cooled Transformer
• 8 MVA Industrial Power Transformer for Grid & Utility Use
• 9 MVA Step-Down Transformer for Large-Scale Distribution Systems
• 10 MVA Substation Transformer – IEC/IEEE Compliant Design

✅ Why Choose Energy Transformer's 15 MVA 132kV/33kV Substation Power Transformer

Energy Transformer’s 15 MVA substation power transformer is designed for high-voltage step-down performance in modern grid infrastructure. Rated at 132kV primary and 33kV secondary, this CE and UL certified oil-immersed unit ensures safe, stable, and energy-efficient power delivery for utility networks, renewable integration, and large-scale industrial installations across Europe, the United Kingdom, the United States, and Canada.

Precision-engineered with high-conductivity copper windings and mineral insulating oil, the transformer delivers excellent thermal performance and prolonged lifespan, even under continuous high-load conditions. Its weatherproof, heavy-gauge steel enclosure is ideal for outdoor substations, protecting against moisture, dust, salt, and extreme temperatures from Scandinavia to Texas.

Core Advantages:

✅ High Efficiency & Full Standards Compliance

This substation power transformer is built to exceed the requirements of IEC 60076, IEEE C57, CSA C88, and UL/CE certifications, ensuring high energy efficiency and regulatory readiness in both European and North American power systems.

✅ Grid-Ready Flexibility for Global Installations

Equipped with adjustable tap changers (±10%, 1.25% steps), Delta or Wye connection options, and Dyn11 vector group by default, this 15 MVA unit supports a wide range of system designs—from transmission-level utilities to renewable substations and interconnection points.

✅ Custom-Built to Match Project Needs

Offered with tailored voltage combinations (up to 145kV/36kV), insulation levels (up to BIL 650kV), and cooling methods (ONAN/ONAF), this substation transformer can be configured for mounting constraints, altitude tolerance, and environmental compliance across markets in Germany, France, the Netherlands, the UK, and beyond.

✅ Low Noise, Stable Operation

Designed with step-lap CRGO silicon steel cores and vibration-dampened assembly, this transformer ensures low acoustic emissions and stable voltage regulation under fluctuating load demands—making it suitable for urban grid points and remote renewables alike.

✅ Export-Approved & Logistics-Friendly

CE-marked for Europe and UL/cUL listed for North America, this 132kV/33kV step-down transformer is pre-certified for direct import into the U.S., UK, Canada, Germany, Spain, Italy, and Nordic regions, minimizing delays in permitting and grid connection.

Whether you're building a new substation, upgrading a legacy transformer fleet, or supporting solar, wind, or BESS (battery energy storage) expansion, Energy Transformer delivers the certified, grid-compliant substation power transformers you need—on time, on budget, and built to last.

📩 Contact us today for expert engineering support, custom specifications, and competitive pricing on 15 MVA and other high-voltage substation power transformer models.