34MVA Electrical Substation Transformer 11KV 304 SS NEMA 4X Tank ANSI IEEE Standards

34MVA Electrical Substation Transformer 11KV Isolation Transformer 304 SS NEMA 4X Tank ANSI IEEE Standards 

This 34 MVA three-phase substation transformer is engineered for modern power infrastructure where high-capacity, corrosion resistance, and reliable delivery timelines are critical. Designed with a 11000V delta primary and 11000Y/6351 grounded wye secondary, it provides stable step-down performance for utility and industrial systems.

Driven by increasing demand from grid expansion, renewable energy integration, and industrial electrification, utilities and EPC contractors are seeking transformers that combine high load capability, environmental durability, and compliance with North American standards. This unit addresses those needs with fan-assisted capacity up to 34 MVA, ANSI/IEEE compliance, and a full 304 stainless steel NEMA 4X enclosure, making it ideal for harsh outdoor environments, coastal regions, and critical infrastructure projects.

Transformer Manufacturing Process

NEMA 4X 304 Stainless Steel Oil Tank

Coil Winding

Final Assembly

Product Photos

Main data

Drawing

Standard Features

High-Capacity Performance – 34 MVA with Forced Air Cooling
Supports continuous operation under heavy load conditions, with KNAN/KNAF cooling enabling flexible response to peak demand and system expansion.

304 Stainless Steel Construction – Built for Harsh Environments
Full 304 stainless steel tank, cabinet, and base with heavy-duty anti-corrosion coating:

1. Superior resistance to corrosion, humidity, salt spray, and industrial pollution
2. Ideal for coastal, chemical, and outdoor substation environments
3. Significantly reduces maintenance costs and lifecycle replacement risk
4. Ensures long-term asset reliability for utility-grade applications

NEMA 4X Enclosure – Maximum Outdoor Protection
Weatherproof, dust-tight, and corrosion-resistant design, suitable for exposed outdoor installations and extreme climates.

Eco-Friendly Natural Ester Insulation Fluid

Biodegradable, non-PCB fluid with high fire point
Improved fire safety and environmental compliance
Preferred for urban, industrial, and renewable energy projects

Advanced Monitoring & Protection System

Equipped with full protection and monitoring devices:

Liquid level, temperature, and pressure indicators with remote alarm contacts
Buchholz relay for internal fault detection
Pressure relief valve and auxiliary control panel
Ensures real-time condition monitoring and operational safety

PRODUCT SPECIFICATION

Applications

• Utility distribution and substation upgrades
• Renewable energy interconnection (solar / wind)
• Industrial plants and heavy manufacturing
• Data centers and commercial power systems
• Grid expansion and electrification projects

Ratings

• Meets/Exceeds CSA Efficiency Ratings
• Complies with ANSI / IEEE C57.12.131
• Complies with ANSI / IEEE C57.12.00
• Complies with ANSI / IEEE C57 12.28
• Complies with ANSI / IEEE C57 12.29
• Complies with ANSI / IEEE C57 12.34
• Complies with ANSI / IEEE C57 12.35
• Complies with ANSI / IEEE C57.12.70
• Complies with ANSI / IEEE C57.12.110
• Complies with ANSI / IEEE C37.47
• Complies with ANSI / IEEE C62.11
• Complies with ANSI / IEEE C62.22
• Complies with ANSI / IEEE 386
• Complies with ANSI / IEEE C2
• Complies with ANSI Z535.4
• Complies with ASTM D6871
• Complies with ASTM D3487
• Complies with 10 CFR Part 431
• Complies with NEMA 260-1996
• Complies with CSA C802-3
• Complies with CSA C2.1-06
• Complies with CSA C50
• Complies with CSA C88
• Complies with CSA C88.1
• Complies with CSA C88-16
• Complies with CSA C227.4 & C227.5
• Complies with CSA C802.1

More Products:

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10–15MVA Substation Transformers

• 10MVA Three Phase Substation Transformer
• Multi-Capacity Multi-Voltage 10/11.2/12.5/14 MVA Oil Immersed Substation Power Transformer 12470V to 2400D 4160Y/2400V ONAN/ONAF ANSI/IEEE Standards
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20–40MVA Substation Transformers

• Three Phase Oil Filled Power Transformer 121KV Series 20000KVA
• High Voltage Three Phase Oil Immersed Transformer 110kV 25000kVA
• 40MVA Utility Substation Conservator Transformer 44kV to 34.5kV Oil Immersed ONAN CSA Standards

FAQ

A: Winley provides clear capacity-based lead times after technical approval: 8-10 weeks for transformers below 10 MVA, 10-12 weeks for 10-40 MVA transformers, and 18-20 weeks for 40-100 MVA transformers. We also provide a detailed production schedule and real-time manufacturing photos to help track progress.We provide a detailed production schedule and real-time manufacturing photos to help track progress.

A: We offer a flexible MOQ of just 1 unit. Complete inquiries are quoted within 1-3 days with 24/7 support. Leveraging our extensive North American experience in renewable energy, data centers and large industrial projects, we ensure highly cost-effective and reliable solutions.

A: Yes, We accept OEM and ODM. Winley provides services for substation power  transformers up to 100MVA, with HV systems up to 145kV. We can customize electrical parameters, structure, fluid, protection, switches, gauges, tank and paint according to customer drawings, with the capability to integrate components from brands like Qualitrol, Eaton Cooper, and MR.

A: Yes. Winley substation transformers are engineered and manufactured in strict accordance with ANSI/IEEE, CSA, NEMA, relevant ASTM standards and IEC 60076.We bring a proven track record across the United States and Canada, supporting critical applications in industrial manufacturing, renewable energy, and power distribution across a range of capacity and voltage requirements.

A: We deliver a complete compliance package: approval drawings, datasheets, nameplate drawings, routine test reports, installation manuals and accessory manuals. We also back your project with lifetime documentation support.

A: Winley ensures quality through strict ISO 9001 process management with dedicated QC oversight. Prior to delivery, every unit undergoes comprehensive routine testing, including Winding Resistance, Turns Ratio, Polarity and Phase Relation, and No-Load Loss and Excitation Current tests. We also fully support Factory Acceptance Testing (FAT) and third-party inspections (SGS).

Q7: Do you provide logistics and transportation support for large-scale projects? 

A: Yes. Winley Electric provides tailored, fully controllable transportation solutions for large-scale transformer projects to ensure compliant customs clearance and zero-damage delivery. We actively assist in verifying critical logistics factors, including shipping dimensions, total weight, offloading conditions, site accessibility, and lifting/rigging requirements.

A: 24 months from B/L. During the warranty period, If there are any accessory problems, just provide photos of damaged accessory, then we will provide free service. According to the number of products, we will provide easily damaged accessories for free. We can also provide technical support if you need.