IEC STANDARD
LIQUID-IMMERSED DISTRIBUTION
kVA Ratings: 50 kVA through 10 MVA
Voltage Ratings: 34,500 GrdY / 19,920 V — up to 170 kV BIL
Product Range
Ratings & Electrical Specifications
- Power Ratings
- Typically from 50 kVA up to 10 MVA
- Voltage Ratings
- Up to 34,500 GrdY / 19,920 V
- Operating Frequency
- 60 Hz (50 Hz available upon request)
- BIL
- Selected for the specified voltage rating and application (up to 170 kV BIL)
- Temperature Rise
- 65°C average winding rise
- Winding Material
- Copper (Cu) or Aluminum (Al)
- Core Construction
- High-grade Grain-Oriented Electrical Steel (GOES)
- Cooling Class
- Liquid-filled, self-cooled (ONAN / KNAN)
Ratings and configurations can be adapted to suit project and utility requirements.
Standard Design Features
- Cold-rolled grain-oriented electrical steel (CRGO) core with step-lap joints
- High- and low-voltage porcelain bushings and terminals
- Grounding provisions and lifting lugs
- Mineral oil insulating fluid (IEC 60296)
- Breather-type construction
- Oil level indicator and dial thermometer
- Laser-etched / Anodized Aluminum nameplate per IEC 60076-1
Available Optional Features
- Natural ester fluid (available upon request)
- Conservator-type tank construction or hermetically sealed tank with pressure-relief valve (PRV)
- Buchholz relay (for conservator type)
- Plug-in / separable connector bushings or cable connection boxes
- No-Load Tap Changer (NLTC)
- 304 Series Stainless-steel tank and cabinet construction
Design & Construction
Tank Construction
Conservator Type
Conventional conservator tank with dehydrating silica gel breather. Compatible with Buchholz relay and integrated protection devices.
Hermetically Sealed (Optional)
Sealed tank construction with pressure-relief valve (PRV). No conservator or breather required. Suitable for outdoor installation and environments where maintenance access is limited.
Documentation, Testing & Applicable Standards
IEC 60076-1
Power Transformers — General Requirements
IEC 60076-2
Temperature Rise for Liquid-Immersed Transformers
IEC 60076-3
Insulation Levels, Dielectric Tests, and External Clearances
IEC 60076-5
Ability to Withstand Short Circuit
IEC 60076-10
Determination of Sound Levels
IEC 60296
Fluids for Electrotechnical Applications — Mineral Insulating Oils
ISO 9001 · 14001 · 45001
Quality, Environmental, and Occupational Safety Management
Engineering Documentation Provided
- Certified Factory Test Reports (CTR per IEC 60076-1)
- Technical Data Sheets & Loss/Efficiency Data
- Component Approval Documents & Submittal Approval Drawings
Request a Technical Quote
Power Transformers — RFQ Form
Engineering Notice: Final ratings and features are confirmed for each order. Additional configurations, accessories, testing, documentation, and other project-specific requirements may be available upon request and are subject to engineering review.