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20/0.4KV 630kVA Ecodesign Power Transformer

The 20/0.4 kV 630 kVA Ecodesign Power Transformer is a compact, hermetically sealed ONAN distribution unit engineered for modern European utility and industrial environments where energy efficiency and low lifecycle cost matter. Designed as a 2-winding, oil-filled transformer with Dyn11 vector connection, this model targets medium-voltage distribution points supplying heavy workshop clusters, food-processing plants, mid-size commercial sites and industrial parks. Its core and winding geometry minimize no-load magnetization losses while the optimized conductor transposition keeps load losses low at rated current. The sealed tank and high-quality mineral insulating oil meet applicable IEC standards for dielectric performance and long service life, with a conservative temperature rise specification to maximize transformer longevity in continuous operation. This product is tested to EU ecodesign efficiency targets and commonly supplied with remote alarm contacts and marshalling panels for integration into modern SCADA systems.

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Product Accessories

Standard accessories (supplied with each unit)

Conservator / hermetic sealing arrangement (as specified) with magnetic oil level indicator and alarm contacts

Oil filler / sampling valve and manhole for service access

Winding temperature indicator (PT100 or equivalent) with 2 alarm / 1 trip contacts

Oil temperature indicator with alarm/trip contacts and fan control outputs

Buchholz relay (where conservator is used) or equivalent gas detection for sealed tanks

Pressure-relief device with alarm/trip contacts and protective shield

Vacuum/pressure gauge with two alarm contacts

Porcelain HV & LV bushings (top-cover or side-wall per customer spec)

Marshalling/terminal control box (NEMA/EN enclosure) with CT/relay mounting provisions

Drain and filter valves, drain with sample cock, and grounding lugs

Basic transformer monitoring kit (analog outputs for oil/winding temp + digital alarm contacts)

Optional / factory-fit accessories

On-load tap-changer (motorized or manual) or off-circuit selector (±2×2.5% or customer-specified range)

Remote dissolved gas analyzer (DGA) or online oil condition monitor

Fans package for ONAF operation (if higher short-term duty required)

Heater and thermostat for cold climates, space heater for marshalling cabinet

Secondary LV cable termination kits or LV cable box for easy field wiring

Seismic lifting & transport fixtures, skid mounting or baseframe modifications

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Product Specifications

Rated Power

630 kVA

Voltage Ratio

0 kV (HV) / 0.4 kV (LV) nominal

Connection Group

Dyn11 (Delta HV / Wye LV with neutral)

Cooling Method

ONAN (Oil Natural Air Natural) — optional fan assisted (ONAF) package available.

Impedance

6.0% at rated power (manufacturer set per site coordination)

No-Load Loss

≤ 0.95 kW (typical design target for modern Tier-2 ecodesign machines; exact value per factory test report).

Load Loss (at 75°C)

≈ 5.6 kW (example factory value used for lifecycle cost calculations).

Temperature Rise

Top oil ≤ 50°C; winding Δ ≤ 55°C (design limits for continuous duty).

Insulation & Oil

Mineral insulating oil meeting IEC 60296 requirements (treated, cleared, breakdown ≥ 70 kV after processing).

Standards & Compliance

IEC 60076 series, EN/CE marking where applicable, and designed to meet EU Ecodesign Regulation requirements for distribution transformers (Tier targets).

Product Applications

Economy is more affordable

positioned as the primary step-down for plant feeders feeding multiple 400V motor panels, HVAC, and production lines. Typical use includes integration with local MCCs, motor soft-starters and frequency converters where harmonic content is moderate—transformer designed with adequate short-circuit withstand to cope with motor starting currents.

Medium-sized Industrial Subdistribution (food / textiles / CNC workshops)
serves as a dedicated distribution transformer for a cluster of buildings—supports evening peak loads, lighting control systems and EV charging islands; often supplied with remote oil/winding temp alarms for building EMS.

Commercial Campus Energy Hubs (shopping centers, business parks)
used as medium-voltage step-down for BESS inverters where stable 400V bus and fast dynamic response are needed; optimized for low no-load loss to reduce parasitic losses during idle periods.

Battery Energy Storage System (BESS) Interconnect
supplies non-IT loads (HVAC, UPS chargers, cooling pumps) where reliability and predictable inrush behavior are required; typically accompanied by OLTC or pre-specified tap positions to maintain LV bus tolerance under varying grid voltages.

Data Center / Server Farm Peripheral Distribution

Product Advantages

Ecodesign-Compliant, Low Lifecycle Cost

engineered to meet EU ecodesign efficiency thresholds for distribution transformers — reduced no-load and load losses shrink annual energy waste and lower total cost of ownership over the transformer's service life.

Robust, Service-Friendly Construction

hermetic/sealed design minimizes moisture ingress and eliminates frequent oil top-ups; modular terminal/marshalling arrangements and standard accessory packages simplify on-site commissioning and maintenance.

Field-Ready Monitoring & Protection

standard alarm contacts for temperature, oil level and pressure relief plus easy fitment for online DGA or temperature monitors — enables predictive maintenance and fast integration into SCADA/EMS.

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.