Premium Distribution Transformer Manufacturer in Vietnam – SOTEK
15+ Years
Established 2008
25K+ Units
Installed Globally
50+ Partners
Global Utilities & EPCs
69 kV
Max Voltage Class
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.
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.
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.
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).
Our Grid Integration Equipment
SOTEK supplies premium transformers tested to IEC 60076 and IEEE C57 standards for distribution, industrial, and green energy grids.
3-Phase Oil Transformer
Corrugated tank layout featuring hermetically sealed expansion or conservator tank. Ideal for heavy-duty industrial and distribution networks.
Dry-Type Transformer
Vacuum-cast encapsulation using epoxy resin. Fire-resistant, environmentally friendly, and requires minimal structural maintenance.
Padmount Transformer
Liquid-filled tamper-resistant substation cabinet. Equipped with separate terminal compartments for optimal public safety.
1-Phase Pole-Mount
Compact overhead distribution transformers. Engineered to withstand harsh coastal, tropical, or remote weather environments.
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.
TUV NORD
System QA Audit
QUATEST 1
Independent Core Testing
ASTA
Type Testing Compliant
EVN
Grid Approved Vendor
Grid Operations & SOTEK News
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 →
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 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 →