Pad & Pole-Mounted Transformer

Three-Phase Pad-Mounted Transformer

A tamper-resistant compartmental pad-mounted transformer for three-phase underground distribution systems.

Rated voltage: Up to 34.5 kV class
Capacity range: 75–10,000 kVA
Standards basis: IEEE C57.12.34
Typical application: utility undergrou…

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Technical product selection

Typical Use

Where this product is used

utility underground distribution, data centers, BESS and commercial campuses

Technical Data

Typical technical parameters

The published values define the normal selection range. Final ratings and interfaces are confirmed against the approved single-line diagram and destination requirements.

Design standardIEEE C57.12.34

ConfigurationNorth American-style distribution systems

Applicable standards

IEEE C57.12.34

Rated voltage

Up to 34.5 kV class

Rated capacity

75–10,000 kVA

System frequency

60 Hz typical

Primary arrangement

Radial or loop feed as applicable

Interface

Dead-front or live-front, utility-specific

Protection

Bayonet, current-limiting fuse or CSP arrangement as applicable

Application

utility underground distribution, data centers, BESS and commercial campuses

Ambient and altitude

Confirmed from site conditions

Testing and inspection

Routine tests plus agreed type, special and third-party inspection requirements

Documentation

Drawings, data sheets, test reports, manuals and packing documents

These values are for product selection. Final guaranteed values are confirmed in the approved technical agreement.

Configuration

Details to confirm before production

Confirm these items so the quotation and product design match your project.

Utility voltage system

State primary voltage, grounded-wye or delta system, secondary voltage, frequency and required BIL.

Feed arrangement

For pad-mounted units select radial or loop feed, then confirm dead-front or live-front primary interfaces.

Protection philosophy

Coordinate bayonet and current-limiting fuses, breakers, surge arresters or CSP protection with utility practice.

Installation interface

Provide pad opening, cable direction, terminal arrangement, tamper resistance, coating and service clearances.

Normal supply

Typical standard equipment

Tamper-resistant enclosure or pole-mounting brackets
Mineral oil-filled sealed tank
Primary and secondary terminals
Pressure relief device
Grounding provisions and corrosion-resistant finish
Nameplate and connection diagram

Project options

Common optional equipment

Loop-feed switching and parking stands
Dead-front elbows, inserts and arresters
Bayonet and current-limiting fuse combination
CSP low-voltage breaker package
Natural ester insulating fluid
Stainless-steel hardware or severe-environment coating

Testing and Documents

Tests and documents supplied with the product

The required tests and documents are confirmed before the order is placed.

Routine verification

Tests required for each completed unit under the selected product standard.

Design and type evidence

Applicable type-test evidence or agreed design verification is reviewed during technical approval.

Special testing

Sound, temperature-rise, impulse, partial-discharge or other special tests are included only when specified.

Document package

Approved drawings, data sheets, test reports, manuals, packing list and agreed quality records.

A tamper-resistant compartmental pad-mounted transformer for three-phase underground distribution systems.

Product overview

Three-Phase Pad-Mounted Transformer is configured for utility underground distribution, data centers, BESS and commercial campuses. Apex coordinates technical review, qualified production, documentation and export delivery according to the approved project requirements.

Applications

utility underground distribution, data centers, BESS and commercial campuses. Final design considers the system study, load profile, fault level, installation environment, efficiency targets and local grid requirements.

Quotation Information

What to include with your inquiry

Send the information you already have. Unknown items can be confirmed during technical review.

Three-phase pad-mounted, single-phase pad-mounted or single-phase pole-mounted
Rated power (kVA)
Primary and secondary voltages
IEEE, ANSI or utility standard
Radial-feed or loop-feed arrangement
Dead-front or live-front connections
Protection and accessory requirements
Quantity
Destination country and delivery location

FAQ

Questions buyers usually ask

What is the difference between radial and loop feed?

Radial feed connects the transformer to one incoming circuit. Loop feed provides six primary bushing interfaces so the circuit can continue to another transformer or be reconfigured by the utility.

What is the difference between dead-front and live-front construction?

Dead-front construction uses fully insulated separable connectors. Live-front construction uses exposed porcelain terminals inside the locked high-voltage compartment. The utility specification determines the interface.

Are guaranteed values the same as the website values?

No. Website values are selection guidance. Guaranteed performance is stated in the approved technical data sheet and commercial offer.

What information helps Apex respond faster?

A single-line diagram, load data, voltage ratio, capacity, quantity, installation conditions, destination and required delivery date provide the best starting point.

Applications

Choose equipment for the site and operating conditions.

View Applications →

Technical Articles

Product selection and application guides.

View Technical Articles →

TECHNICAL ARTICLE

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Three-Phase Pad-Mounted Transformer

Where this product is used

Typical technical parameters

Details to confirm before production

Utility voltage system

Feed arrangement

Protection philosophy

Installation interface

Typical standard equipment

Common optional equipment

Tests and documents supplied with the product

Routine verification

Design and type evidence

Special testing

Document package

Product overview

Applications

What to include with your inquiry

Questions buyers usually ask

Choose equipment for the site and operating conditions.

Product selection and application guides.

The Minimum Data Needed for a Reliable Transformer RFQ

Transformer Tests and Documentation Buyers Should Request

Compact Substation Layout: Design Before Packaging

Ready to request a quotation?

Where this product is used

Typical technical parameters

Details to confirm before production

Utility voltage system

Feed arrangement

Protection philosophy

Installation interface

Typical standard equipment

Common optional equipment

Tests and documents supplied with the product

Routine verification

Design and type evidence

Special testing

Document package

Product overview

Applications

What to include with your inquiry

Questions buyers usually ask

Compare within this product family.

Single-Phase Pad-Mounted Transformer

Single-Phase Pole-Mounted Transformer

Choose equipment for the site and operating conditions.

Product selection and application guides.

The Minimum Data Needed for a Reliable Transformer RFQ

Transformer Tests and Documentation Buyers Should Request

Compact Substation Layout: Design Before Packaging

Ready to request a quotation?