Pad-mounted Transformer
1. Tamper-Resistant Compartmental Design: Lockable high- and low-voltage compartments support safe outdoor installation and controlled access.
2. Radial-Feed or Loop-Feed Configurations: Primary arrangements can be engineered to match the project distribution system.
3. Live-Front or Dead-Front Primary Options: Bushing and termination arrangements are selected for the specified voltage class and utility requirements.
4. Project-Specific Protection and Switching: Bay-O-Net fuses, current-limiting fuses, surge arresters and load-break switches are available as required.
5. IEEE/ANSI and DOE Configurations: Designs can be provided to applicable IEEE standards and U.S. Department of Energy efficiency requirements when the product falls within the regulated scope.
Product Details
Three-Phase Pad-Mounted Distribution Transformer
This oil-immersed, compartmental-type transformer is designed for outdoor distribution systems serving commercial, industrial, utility and renewable-energy applications. Each unit is engineered to the approved single-line diagram, voltage ratings, loading conditions and utility requirements.
Typical Configuration Range
• Capacity: 75–3,750 kVA; other ratings available subject to engineering review
• Primary Voltage: 4.16–34.5 kV
• Secondary Voltage: 208Y/120 V through 480Y/277 V, with other project-specific voltages available
• Frequency: 50 or 60 Hz
• Primary Arrangement: Radial feed or loop feed
• Primary Interface: Live front or dead front
• Insulating Fluid: Mineral oil or natural ester fluid, as specified
• Cooling: ONAN or KNAN, depending on insulating fluid and design
• Taps: De-energized tap changer configurations available
• BIL: Selected according to the voltage class and applicable standard
Available Protection and Accessories
• Bay-O-Net expulsion fuses and backup current-limiting fuses
• Load-break switches and sectionalizing options
• Surge arresters
• Pressure-relief device, liquid-level gauge, temperature gauge and drain/sampling valve
• CT/PT provisions, metering compartments and customer-specified accessories
• Stainless-steel hardware and project-specific corrosion-protection systems
Standards and Testing
Configurations are available for applicable requirements of IEEE C57.12.00, IEEE C57.12.34, IEEE C57.12.28 and IEEE C57.12.90. U.S. Department of Energy efficiency requirements under 10 CFR Part 431 apply when the transformer is within the regulated distribution-transformer scope. Final compliance requirements are confirmed during technical review.
Dimensions, weight, impedance, temperature rise, losses, BIL and accessory arrangements vary by rating and project. Final values are provided on the approved drawings and certified test documentation.
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