200 kVA Oil-Immersed 3 Phase Step Down Transformer, 11kV to 400V, IEC/ANSI Compliant

This 200 kVA three-phase step-down transformer is a durable and energy-efficient solution for medium-to-low voltage conversion in commercial, industrial and municipal power distribution networks. An oil-immersed transformer with a 11 kV primary voltage and 400 V secondary voltage, it is ideally suited for European and international 50 Hz power grids. Its star-grounded secondary design ensures load balancing and a safe neutral connection, making it the perfect choice for applications requiring reliable three-phase power distribution.

 

 

Manufactured by GNEE, a certified power transformer supplier with over 18 years of experience, this transformer features a precision-engineered core made of cold-rolled grain-oriented (CRGO) silicon steel and oxygen-free copper windings for exceptional electrical conductivity and low iron losses. The transformer tank is filled with high-quality mineral insulating oil for long-term thermal and dielectric stability, with biodegradable or flame-retardant insulating oil available as an option.

 

Designed to meet or exceed international standards including IEC 60076, ANSI C57 and IEEE, it adopts a hermetically sealed steel tank coated with anti-corrosive paint to maximize protection against moisture, salt spray and mechanical wear. Built-in protection features include a temperature indicator, oil level sight glass, pressure relief valve and an optional gas relay for enhanced safety.

 

This 200 kVA oil-immersed three-phase step-down transformer is widely used in power substations, industrial parks, logistics hubs, shopping malls and public infrastructure projects. It is also highly suitable for integration with renewable energy systems, battery energy storage applications and backup generators. If you are looking for a reliable 11kV to 400V three-phase distribution transformer for commercial or light industrial power networks, GNEE offers certified factory-direct solutions to meet your grid and application needs.

 

Learn More: 400 kVA Step-Down Oil-Immersed Distribution Transformer, 13.8 kV to 480Y/277 V, ANSI Compliant

 

 

GNEE's 200 kVA three-phase step-down transformer is engineered for stable 11 kV to 400 V step-down conversion for European and North American power grids. This oil-immersed transformer is suitable for outdoor operation, boasting high thermal efficiency, low losses and a long service life. Compliant with IEC, ANSI and IEEE standards, it delivers safe and reliable medium-voltage distribution for commercial and utility applications.

 

✅ Applications of the 200 kVA Step-Down Transformer

This three-phase step-down transformer is the ideal choice for commercial complexes, electric vehicle charging stations, agricultural irrigation, manufacturing plants, public infrastructure and renewable energy systems. It ensures reliable performance in a variety of applications across the UK, Germany, Spain, France, the USA and Canada.

 

Learn More:Transformers in Data Centers: Applications, Technologies and Selection Criteria

 

✅ Reliable Three-Phase Transformer Manufacturer

GNEE is a world-leading transformer manufacturer with ISO 9001 certification, specializing in three-phase step-down transformers for over 30 years. All products are tested and compliant with UL, CSA, CE and DOE standards. We offer OEM/ODM solutions, supplied at highly competitive factory-direct prices with custom branding options.

 

 

✅ Supply for Three-Phase Step-Down Transformers in the USA and EU

We supply in-stock and custom products through our logistics hubs in Rotterdam, Antwerp, Houston, Los Angeles, Toronto and Barcelona. All products comply with local grid specifications and come with complete documentation support.

 

✅ 200 kVA Step-Down Transformer for Sale

Available in stock or with rapid production. FOB, CIF or DDP delivery terms are offered to your port or construction site. An ideal choice for EPC contractors, distributors and infrastructure contractors in need of certified three-phase step-down transformers.

 

✅ Electrical Configuration of the 200 kVA Transformer

Primary side: 11 kV, delta connection

Secondary side: 400Y/230V, star connection

This three-phase step-down transformer supports balanced load distribution and a grounded neutral point for improved safety. Optional configurations include delta-delta or star-star connections.

 

✅ Current Calculation (Three-Phase Step-Down)

Low voltage (400 V): ≈ 289 A

High voltage (11 kV): ≈ 10.5 A

Amperage = (200 × 1000) ÷ (√3 × Voltage)

 

✅ Transformer Dimensions and Installation

Approximate dimensions: 1500 mm × 1100 mm × 1400 mm

Mounting: Steel base, ground-installable

Custom enclosures available for space-constrained or urban environments

 

✅ Weight and Oil Capacity

Weight: 850 – 1,100 kg

Oil capacity: 120 – 160 litres of mineral-based insulating oil

All oils comply with IEC 60296 and ASTM D3487 standards; biodegradable and flame-retardant insulating oil options are available.

 

✅ Pricing for the 200 kVA Three-Phase Step-Down Transformer

Price range: US$3,500 – US$6,800, subject to design, certification and optional configurations.Request a project-specific quote (FOB/CIF/DDP options available).

 

✅ Energy Efficiency Standards

Compliant with EU Ecodesign Tier 2 and US DOE 2016 energy efficiency standards

Low core and copper losses with cold-rolled grain-oriented silicon steel cores and copper windings

 

Learn More: Power Transformers: Definitions, Types and Applications

 

✅ Tap Changer Options

Manual OFF-circuit tap changer (OCTC) with standard accuracy of ±2×2.5%

On-load tap-changing (OLTC) transformers with voltage regulation are available as an option for grid fluctuation environments

All three-phase step-down transformer models feature precise voltage control.

 

✅ Transformer Enclosure and Protection Features

Tank type: Fully sealed with anti-corrosive coating

Protection class: Standard IP23; optional IP54 (for marine or humid environments)

Integrated pressure relief valve, oil level gauge, thermometer, with optional Buchholz relay and surge protector.

 

✅ Installation Guidelines

Factory-filled, tested and sealed for direct installation

Suitable for radial or loop distribution networks

Mountable on concrete plinths or steel structural bases

Detailed wiring and grounding diagrams provided.

 

Learn More: Key Components of Power Transformers: Core, Windings and Insulation

 

✅ Lead Time and Logistics

Standard units: 20-30 days

Custom units: 45-65 days

Global shipping in containers or on pallets; compliant with EU and US import regulations

 

✅ Certifications and Testing

Standards: IEC 60076, ANSI C57, IEEE, CE, UL, CSA

Each three-phase step-down transformer includes a routine test report; type tests and special tests available upon request

Third-party inspection (SGS, TUV, BV) can be provided.

 

✅ Wholesale and Bulk Supply

We support large-volume orders, government tenders and private label production of three-phase step-down transformers, offering fast production cycles and flexible minimum order quantities for distributors and project integrators.

 

✅ Other Transformer Models Available

Oil-immersed transformers: 100 kVA, 250 kVA, 315 kVA, 500 kVA, 750 kVA, 1000 kVA, 1500 kVA, 2000 kVA, 2500 kVA

Dry-type, cast resin, pole-mount and substation configurations

Inverter step-down transformers for solar and battery energy storage systems

 

 

 

Q: What is the expected service life?

A: 25-30 years under normal load and climatic conditions.

 

Q: Can this transformer be used on a 50 Hz grid?

A: Yes, we offer a dual-frequency compatible version (50/60 Hz).

 

Q: Is this product compliant with EU/UK certification standards?

A: Yes, this product is CE certified and fully complies with IEC and BS standards.

 

GNEE provides reliable, high-efficiency and code-compliant three-phase step-down transformers to meet your 11 kV to 400 V power distribution needs. Whether for utilities, solar power plants or data centers, our 200 kVA transformer delivers peace of mind and an ultra-long service life.

 

📩 Contact us now for technical drawings, quotes and delivery timelines.

Request A Quote

 

200 kVA 11kV to 400V Oil-Immersed 3 Phase Step Down Transformer Technical Specs

No.	Item	Specification	Description
1	Rated Capacity	200 kVA	Suitable for small to mid-scale commercial and industrial low-voltage distribution
2	Input Voltage	11 kV (Delta)	Standard medium-voltage input, adaptable to 10.5 kV or 13.8 kV upon request
3	Output Voltage	400 V / 230 V (Wye)	Ideal for European, Australian, and international 50 Hz power networks
4	Phase Configuration	3-phase, 50/60 Hz	Compatible with both EU and North American system frequencies
5	Cooling System	ONAN (Oil Natural Air Natural)	Quiet, self-regulating cooling system requiring no external fans
6	Core Material	CRGO silicon steel	Minimizes core losses for better power quality and energy savings
7	Insulation Medium	Mineral oil (IEC/ASTM Grade)	Delivers thermal stability and insulation under continuous operation
8	Temperature Rise	Max 60°C	Optional energy-saving model available with 50°C or 55°C rise limits
9	Enclosure Design	Sealed, rust-resistant tank	Outdoor-rated with optional pad-mounting; IP44/IP54 protection classes available
10	Standards Compliance	IEC 60076, ANSI C57, BS, EN	Designed to meet grid standards across Europe, UK, Canada, and Australia
11	Certifications	CE, UL, ISO 9001, RoHS, SGS	Export-ready and approved for international utility and private use
12	Winding Configuration	Delta primary – Wye grounded secondary	Custom options available: Wye-Wye, Delta-Delta, Wye-Delta
13	Target Applications	Commercial buildings, EV charging, infrastructure	Also fits rural networks, solar farms, and construction projects
14	Protection Features	Oil gauge, thermal sensor, relief valve	Optional surge arresters, oil drain valves, and gas relays available
15	Transformer Size	Varies by enclosure and voltage group	Weight: ~600–900 kg depending on cooling and material
16	Efficiency Rating	Meets DOE & Ecodesign standards	Designed for minimal core and copper losses under full load
17	Mounting Method	Skid base with lifting lugs	Ready for crane/forklift transport and permanent outdoor installation
18	Operating Range	-25°C to +45°C	Arctic version available for extreme cold to -40°C
19	Full Load Loss	Approx. 1.0–1.3%	Balanced for high performance and energy savings at rated output
20	No-Load Loss	≤ 0.25%	Maintains minimal energy use during idle periods
21	Load Loss	≤ 0.85%	Low-resistance copper windings ensure stable delivery
22	Impedance	4.5% ±10%	Tunable upon request for grid harmonics and fault coordination
23	Short Circuit Capacity	Up to 16 kA for 2s	Internally braced for mechanical durability during fault events
24	Insulation Class	Class A (105°C) standard	Class B or Class F upgrade for high-temp areas
25	Winding Material	Copper standard, aluminum optional	Copper preferred for longer life and greater thermal endurance
26	Tap Changer	±2 × 2.5% Off-Circuit Tap Changer	On-load tap changer (OLTC) upgrade available for voltage tuning
27	Bushings	Porcelain or polymer per ANSI/IEC	Salt-resistant polymer bushings for coastal or desert regions
28	Oil Volume	Approx. 90–110 Liters	Depends on tank style and ambient temperature specification
29	Lifespan Expectancy	20–30 years	Designed for long-term reliability with minimal maintenance
30	Audible Noise	≤ 50 dB @ 1m	Quiet operation ideal for residential or mixed-use areas
31	Warranty Coverage	2-year base warranty	Extended warranties and service contracts offered on request
32	Lead Time (Stock)	15–25 days	In-stock models ship quickly for urgent project needs
33	Lead Time (Custom)	40–55 days	Efficient custom manufacturing with full compliance documentation
34	Pricing Terms	RFQ based on specs and quantity	Tiered pricing available for bulk, OEM, or export orders
35	Origin & Brand	GNEE(China)	Proven OEM transformer factory with global supply to the EU, US, and Australia