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6KV and 10KV 630kVA Ecodesign Power Transformer

A compact, hermetically sealed 630 kVA distribution transformer engineered for modern grids and strict Ecodesign Tier-2 markets. Offered in 6 kV and 10 kV HV classes with 400 V LV options, this ONAN, hermetic tank unit is optimized for low no-load losses and reduced life-cycle cost — available with mineral oil or high-performance natural-ester (FR3) dielectric fluid for improved fire safety and sustainability. Built to IEC 60076 and European ecodesign loss targets, the design combines rugged mechanical construction, low audible noise and modular monitoring options for safe deployment in industrial plants, substations and commercial sites.

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Product Accessories

Standard accessories

Magnetic oil level indicator with dual alarm contacts

Oil temperature gauge (top oil) with alarm/trip contacts

Winding temperature indicator (PT100 or RTD) with alarm contacts

Drain and sampling valve with captive cap

Dehydrating silica-gel breather (or hermetic seal option)

Pressure-vacuum gauge and pressure relief device with signal contact

Lifting lugs and base skid mounting pads

Nameplate and wiring marshalling box (stainless steel)

Optional upgrades

FR3 / natural-ester fill instead of mineral oil.

Built-in dissolved-gas monitoring (DGA socket or fitted DGA)

Remote temperature/fan control module (4–20 mA / Modbus)

Low-noise radiators and staged fan kit for ONAF cooling

HV bushing CTs, LV metering CTs, surge arresters and NEMA control enclosure

Extra tapping range / motorized OLTC (where required by spec)

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Product Specifications

Rated Power

630 kVA

High Voltage Options

6.0 kV / 6.3 kV / 10 kV / 10.5 kV

Low Voltage

400 V (three-phase) or 480/415 V variants (customer selectable).

Cooling Method

ONAN (standard); ONAF upgrade available for higher short-term capacity.

Vector Group

Dyn11 (standard) — other vector groups on request.

Typical No-Load Loss

≈ 800–950 W (design dependent — meets Ecodesign Tier-2 thresholds when specified).

Typical Load (Copper) Loss

≈ 5,600–6,200 W @ 75°C (nominal).

Impedance (Nominal)

4.5 – 5.5% (factory set to match system short-circuit requirements).

Insulation / Test Levels

LI75 / AC35 (MV) / LV per IEC60137; design to withstand specified impulse and power-frequency tests.

Ambient / Altitude

−45°C to +50°C operation range (altitude to 1,000 m standard; higher on request).

Product Applications

Economy is more affordable

Supplies main LV distribution boards where continuous 630 kVA capacity and low dwell losses reduce energy costs during 24/7 operation. (Often paired with built-in monitoring for predictive maintenance.)

Industrial campus distribution (manufacturing plants)
Tailored for shopping centres, hospitals and large malls where fire-safe natural-ester options and low audible noise are required.

Medium-voltage distribution for commercial complexes
Used as on-site step-down for PV/BESS installations where low no-load loss improves overall project ROI and Ecodesign compliance is required.

Renewable-integration substations (behind-the-meter)
Compact hermetic units for enclosed or constrained sites where sealed design reduces maintenance and moisture ingress risk.

Utility feeder/regulating stations in urban networks

Product Advantages

Ecodesign-ready, low lifetime operating cost

Designed to meet EU Tier-2 loss limits so running costs and CO₂ profile are significantly lower compared with older designs; ideal where long-term operating expense matters.

Enhanced fire safety & sustainability option

Natural-ester (FR3) dielectric is available to improve flash/fire points, biodegradability and grid resiliency in sensitive or regulated sites.

Hermetic construction — low maintenance, high reliability

Sealed tank design reduces ingress of moisture and oxygen, improving insulating oil life and minimizing routine maintenance in harsh or space-constrained installations.

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.