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500KVA Three Phase Pad Mounted Transformer

A compact, service-ready 500 kVA pad-mounted transformer engineered for modern distribution needs. This oil-filled, compartmentalized unit converts medium-voltage lines (up to 34.5 kV class) to three-phase secondary voltages used by commercial, industrial and energy-storage sites. Built to meet ANSI/IEEE performance and safety norms and designed with DOE efficiency targets in mind, the 500 kVA pad transformer is optimized for low-loss operation, secure fault isolation and uncomplicated service access — making it a practical core asset for EV charging clusters, BESS inverters, data center feed points and industrial process loads.

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Product Accessories

Compartmental HV/LV Bushings — oil-filled high-voltage bushing wells and multi-hole LV studs for safe cable connections.

5-Position HV Tap Changer — externally accessible off-circuit tap assembly for site voltage fine-tuning.

Bay-O-Net & ELSP Fuse Holders — fast, field replaceable secondary protective fusing.

Vacuum Pressure Gauge & Pressure-Relief Valve — tank safety and integrity monitoring with alarm contacts.

Oil Fill, Drain & Sampling Valves — captive-cap fill and bottom drain with sampling port for routine oil analysis.

Radiator & Fan Package (optional) — for KNAN/ONAF cooling upgrades when higher short-time loads are anticipated.

NEMA-rated Marshalling/Control Box — includes thermometers, winding-temp contacts and fan control relays.

Ground Strap & Lifting/Lug Kit — ready-to-install earthing hardware and hoist points for safe handling.

Stainless Nameplate & Wiring Diagram — stainless data plate and door-mounted schematic for quick field reference.

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Product Specifications

Rated Capacity

500 kVA

Primary (HV) Nominal

up to 34.5 kV class (typical options: 12.47 kV, 13.8 kV, 24.94 kV, 34.5 kV)

Secondary (LV) Typical

208Y/120 V, 480Y/277 V, 600Y/347 V

Vector Group

DYn1 (common) — selectable per project

Cooling Method

ONAN (standard); fan-assisted ONAF/KNAN optional for extended ratings.

HV Tap Range

±2 × 2.5% (5 taps) off-circuit (site-adjustable)

Impedance Voltage

~4.00% (factory set; influences fault current contribution)

No-Load Loss / Load Loss

typical target range ~930 W (no-load) / ~6500 W (load) depending on voltage combo and winding material.

Insulation / BIL

HV BIL options up to 150 kV, LV BIL up to 30 kV (configured per system).

Certifications & Standards

Designed to comply with IEEE/ANSI pad-mounted transformer standards and DOE efficiency rules; UL/cUL and CSA listings available on request.

Product Applications

Economy is more affordable

Supplies banked 480V infrastructure for clustered DC fast chargers (multiple 250–500 kW charger arrays). Transformers are specified with surge-mitigation accessories and quick isolation fusing to protect upstream feeders.

EV Charging Hubs — Medium-Voltage to Fast-Charger Feed
Acts as the interface between inverter arrays and distribution lines; fan-assisted cooling (ONAF) and winding temperature monitoring are often added to handle high charge/discharge duty cycles.

Battery Energy Storage Systems (BESS) — Inverter Step-Up/Step-Down
Used to create local 480Y/277 V distribution segments with high reliability and low loss; favored for their compartmentalized safety and easy maintenance access for critical loads.

Data Center Distribution — Dedicated Utility Ring Nodes
Feeds motor loads, pump stations and machine tool clusters where a compact pad-mounted unit simplifies site layout and reduces footprint vs. small substations.

Light-to-Medium Industrial Parks / Process Spurs

Product Advantages

Fit-for-Purpose Efficiency

Engineered to meet or exceed DOE distribution transformer efficiency thresholds so site total cost of ownership is reduced through lower core and copper losses.

Serviceability & Safety

Compartmental design (separate HV/LV compartments), accessible drain/sampling plumbing and external fuse access reduce outage duration and improve technician safety compared with open-type substation setups.

Flexible Deployment

Multiple primary/secondary combinations, optional fan packs and a wide accessory suite let the same core design serve EV charging farms, BESS projects, data centers and industrial feeders with minimal redesign.

WellDone Power Transformer Plan Drawing

FAQ

What range of transformer products do you offer and which standards do they meet?

We manufacture a diverse array of transformers including Oil-Immersed Distribution Transformers, Dry Type Transformers, Power Transformers, Three Phase Pad Mounted Transformers, Single Phase Pad Mounted Transformers, Substation Transformers, and Pole Mounted Transformers. Our technical team, with nearly 20 years of industry experience, ensures that our designs comply with international standards such as ANSI, IEEE, DOE, CSA, AS, AZS, GOST, IEC, and more. Additionally, many of our products have obtained UL, cUL, and CSA certifications, affirming their safety and performance in global markets.
How do you ensure the quality and reliability of your transformers?

Our transformers are produced under a rigorous quality management system covering every stage from material selection to final testing. Each product comes with a minimum 24-month warranty, ensuring long-term safety and reliability. This commitment to quality has earned the trust of global customers and leading industry players.
What are your production lead times, customization options, and global market reach?

For standard models, our production lead time is typically 10 to 25 days, and we offer flexible OEM/ODM services for customized projects. We also tailor packaging solutions to meet specific customer requirements. Our transformers are exported worldwide—including North America, Europe, South America, Australia, Asia, and Africa—with successful partnerships involving renowned companies. For more details or personalized support, please contact us via email or WhatsApp.

500KVA Pad Mounted Transformer Three Phase Pad Mounted Transformer 500KVA Three Phase Pad Mounted Transformer

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