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Tier2 315kVA Oil Filled Distribution Transformer

A next-generation 315 kVA oil-filled distribution transformer engineered for low-loss, high-reliability distribution networks. Built to meet Ecodesign Tier-2 energy targets and IEC testing protocols, this unit blends a compact ONAN cooling envelope with optimized CRGO core laminations and transposed aluminium windings to cut no-load and load losses while preserving high short-circuit strength. The design prioritizes safe outdoor installation, ease of field maintenance and remote condition monitoring—delivering measurable lifetime energy savings for commercial feeders, small industrial parks and EV charging hubs. Compliance with Ecodesign Tier-2 guidance and international transformer standards ensures lower operating cost and reduced carbon footprint across the asset lifecycle.

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Product Accessories

Magnetic oil level indicator with two alarm contacts

Oil temperature gauge with alarm/trip contacts and RTD output

Breather with silica-gel canister (self-regenerating option available)

Vacuum pressure gauge and pressure-relief device with electrical contact

Two-position oil-immersed load-break switch (as required)

Oil drain and sample valve with captive cap

Lifting lugs and jacking pads for safe handling

NEMA 3R stainless-steel marshalling/control box with fan starter outputs and remote alarm terminals

Desiccant breather and touch-up paint kit (supplied loose)

Routine test certificate, conformity paperwork and O&M manual

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Product Specifications

Rated power

315 kVA (continuous)

High-voltage rating

11 kV (standard design, other HV taps available)

Low-voltage rating

415 V (three-phase 4-wire configuration)

Cooling method

ONAN (natural oil, natural air); fan-assist (ONAF) optional

Tap range

+7.5% / −5% on HV side, 5 tap steps (off-circuit)

Vector group

Dyn11 (standard) to support solidly earthed LV neutrals

No-load loss

~324 W (low-excitation core design to meet Ecodesign expectations)

Load loss (@ 75°C)

~2,800 W (optimized winding layout and conductor sizing)

Rated impedance

4.75% (designed for coordination with feeder protection)

Temperature rise

Oil 60°C / Winding 65°C (thermal class A insulation system)

Product Applications

Economy is more affordable

Primary feeder for shopping centres, mid-rise mixed-use blocks and campus ring mains where low standby losses reduce operating expenses.

Urban commercial distribution loops
Supplying light-to-medium manufacturing units (machining, assembly, processing) requiring stable voltage and robust short-circuit withstand.

Medium-demand industrial parks
Dedicated feeder substations next to commercial EV hubs where high utilization benefits from reduced load and no-load losses.

Clustered EV fast-charging stations
Point of common coupling for battery energy storage systems and inverter farms where efficient step-down and low stray losses improve round-trip economics.

BESS / inverter-connected substations (utility scale)

Product Advantages

Ecodesign Tier-2 efficiency (lower lifecycle cost)

Designed to meet the tighter Ecodesign loss limits, the unit reduces energy waste both at no-load and under load—translating to lower utility bills and quicker payback in high-duty installations.

Service-friendly architecture

External gauges, accessible drain/sample ports, NEMA marshalling box and standardized lift/jacking features make on-site maintenance fast and safe—minimizing downtime and onsite labour.

Grid-ready protection & monitoring

Fitted with industry-standard alarm/trip contacts, vacuum/pressure monitoring and optional remote telemetry integration, the transformer supports modern protection philosophies and remote asset management.

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.