SOTEK — Premium Power & Distribution Transformers

Premium Distribution Transformer Manufacturer in Vietnam – SOTEK

📞 Hotline: +84 903.219.753 | 📧 Email: infor@sotekvietnam.com | 📍 Plant: Tien Son Industrial Park, Tu Son, Bac Ninh, Vietnam
Company Profile PDF |
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Flagship Performance

Oil-Immersed Distribution

Three-phase corrugated and conservator tank systems from 50 kVA up to 16,000 kVA. Designed for 22kV / 35kV grid connections with low losses and high overload capacity.

View Specifications Direct RFQ
Indoor Safety & Commercial

Cast Resin Dry-Type

Class F & H insulation systems ranging from 50 kVA up to 3,150 kVA. Self-extinguishing, fire-resistant, and optimal for commercial towers, hospitals, and heavy industrial facilities.

Explore Dry-Type Technical Quote
Underground Network Solutions

Padmount Transformers

Loop-feed and radial-feed compartmentalized designs from 75 kVA up to 5,000 kVA. Built to IEEE C57.12.34 and ANSI C57.12.28 tamper-resistant standards for underground grids.

Technical Specs Get Padmount RFQ
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15+ Years

Established 2008

25K+ Units

Installed Globally

50+ Partners

Global Utilities & EPCs

40.5 kV

Max Voltage Class

SOTEK Capabilities

Why Power Utilities Choose SOTEK

We control every step of engineering, raw material sourcing, coil winding, core stacking, and testing to deliver grid-resilient transformers.

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Engineered Efficiency

Our core stacking employs precision laser-cut cold rolled grain oriented (CRGO) steel. This minimizes eddy current losses and no-load losses below standard IEC requirements.

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Tailored Specifications

Whether you require low-sound levels for residential zones, loop-feed arrangements for underground urban grids, or special tap changers, our R&D designs to your parameters.

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Type-Tested Security

SOTEK units undergo strict routine testing and type tests (lightning impulse, temperature rise, short-circuit withstand) certified by accredited national laboratories (Quatest 1).

Product Catalog

Our Grid Integration Equipment

SOTEK supplies premium transformers tested to IEC 60076 and IEEE C57 standards for distribution, industrial, and green energy grids.

SOTEK 3-Phase Oil-Immersed Distribution Transformer
Best Seller
Liquid Filled

3-Phase Oil Transformer

Corrugated tank layout featuring hermetically sealed expansion or conservator tank. Ideal for heavy-duty industrial and distribution networks.

50 – 16,000 kVA Up to 40.5 kV IEC 60076
Specs Table ✉️
SOTEK Cast Resin Dry-Type Transformer
Cast Resin

Dry-Type Transformer

Vacuum-cast encapsulation using epoxy resin. Fire-resistant, environmentally friendly, and requires minimal structural maintenance.

50 – 6,300 kVA Class F / H Low Noise
Specs Table ✉️
SOTEK Compartment Padmount Transformer IEEE C57
New Line
Underground Grid

Padmount Transformer

Liquid-filled tamper-resistant substation cabinet. Equipped with separate terminal compartments for optimal public safety.

75 – 5,000 kVA IEEE C57.12.34 Underground
Specs Table ✉️
SOTEK 1-Phase Pole-Mounted Overhead Transformer
Rural Electrification

1-Phase Pole-Mount

Compact overhead distribution transformers. Engineered to withstand harsh coastal, tropical, or remote weather environments.

15 – 500 kVA ANSI C57.12.20 Overhead
Specs Table ✉️
International Certifications

Grid Compliance & Heavy-Duty Validation

SOTEK transformers are manufactured under rigorous QA/QC protocols. Our production facility holds active system audits from ISO 9001 and ISO 14001.

Every single batch of transformers is routine-tested internally before shipment. We provide full technical dossier files, including lightning impulse test records and short-circuit validation reports.

View ISO Certificates
✓ IEC 60076 Standards
✓ IEEE C57 Utility Specs
✓ ISO 9001 & 14001

TUV NORD

System QA Audit

QUATEST 1

Independent Core Testing

ASTA

Type Testing Compliant

EVN

Grid Approved Vendor

Technical Insights

Grid Operations & SOTEK News

Aboitiz Power grid project SOTEK transformer
MAY 18, 2026

SOTEK Extends Supply Agreement with Aboitiz Power Philippines

Providing premium distribution transformers to support grid modernization and reliable energy delivery across Visayas and Mindanao networks.

Read Full Report →
SOTEK padmount transformer installation
APRIL 27, 2026

Launching the IEEE Tamper-Resistant Padmount Series

Our R&D team completes full verification of modular underground loop-feed padmount transformers built to IEEE standard tamper-proof enclosures.

Technical Specs →
Gia Binh Factory
MARCH 10, 2026

Gia Binh Factory Expansion Completes Phase 2 Testing

Scaling our production capacity to meet global demand, adding high-precision automatic winding lines for dry-type cast resin coils.

Plant Tour →