220kV–400kV 200MVA Transmission Power Transformer | 3-Phase Oil-Immersed

220kV–400kV 200MVA Transmission Power Transformer For Sale

The 220kV–400kV 200MVA Transmission Power Transformer by Energy Transformer is engineered for utility-scale high-voltage applications, supporting the stable and efficient transmission of electric power across national and regional grids. Designed for long-distance energy delivery, this transformer meets the operational demands of transmission substations, grid interconnections, and industrial distribution systems.

This oil-immersed, 3-phase Transmission Power Transformer features a Delta-connected high-voltage primary (220–400kV) and customizable secondary voltage outputs such as 138kV, 66kV, or 34.5kV, depending on regional grid standards. The transformer is constructed with grain-oriented silicon steel cores and oxygen-free copper windings to ensure low core loss, high thermal efficiency, and long operational lifespan.

As a professional Transmission Power Transformer manufacturer, we deliver complete solutions that include:

• Custom electrical configuration (impedance, voltage class, tap settings)

• ONAN cooling system with optional ONAF or OFAF upgrades

• Optional On-Load Tap Changer (OLTC) for voltage regulation flexibility

• Integrated protection and monitoring systems (Buchholz relay, WTI, OTI, SCADA interface)

• Corrosion-resistant, oil-filled enclosure for reliable outdoor installation

All units comply with ANSI/IEEE, IEC, CSA, and DOE performance and energy efficiency standards. Each Transmission Power Transformer undergoes strict routine and type testing, covering dielectric performance, impulse voltage withstand, thermal stability, and partial discharge limits.

Energy Transformer supports OEM/ODM customization and offers flexible production and logistics options for large-scale orders. We serve EPC firms, power utilities, and industrial clients across the United States, Canada, United Kingdom, Germany, France, Spain, Netherlands, Italy, Portugal, and Australia.

If you require a high-voltage Transmission Power Transformer for grid reinforcement, cross-border interconnection, or renewable energy transmission, we offer engineered solutions backed by quality manufacturing and global supply support.

3-Phase Oil-Immersed 220kV–400kV 200MVA Transmission Power Transformer Technical Specs

No.	Item	Specification	Remark
1	Rated Capacity	200 MVA (options from 150–300 MVA)	Designed for regional and national transmission grids
2	High Voltage Side	220kV to 400kV (Delta or Wye input)	Suitable for bulk power transfer over long distances
3	Output Voltage	138kV, 69kV, 66kV, 34.5kV (custom options)	Supports downstream substation applications
4	System Configuration	Three-phase, 50Hz / 60Hz	Compatible with global transmission standards
5	Cooling Method	ONAN / ONAF (Oil Natural / Air Forced)	Ensures thermal stability under continuous load
6	Core Material	Cold-rolled grain-oriented silicon steel	High magnetic permeability for reduced core loss
7	Insulating Medium	High-performance mineral or ester oil	Enhances dielectric strength and cooling efficiency
8	Temperature Rise	≤65°C (ONAN), ≤75°C (ONAF)	Operates safely under heavy loading conditions
9	Tank Structure	Sealed steel tank with outdoor-grade coating	Corrosion protection for coastal and inland climates
10	Standards Compliance	IEC 60076, IEEE C57.12, ANSI, CSA	Meets utility regulations in North America & EU
11	Certifications	UL, CE, CSA, SGS, ISO9001	Third-party certified for safety and performance
12	Connection Schemes	D–Y, Y–Y, D–D, Y–D	Customized for grid operator and EPC requirements
13	Application Scope	Transmission substations, utility grids, industry	Built for high-voltage infrastructure
14	Protection Features	Gas relay, pressure relief, temperature alarms	Standard grid-level transformer protection
15	Dimensions	Custom-engineered per voltage class	Tailored to installation footprint and site needs
16	Efficiency Rate	≥99.35% at rated power	Supports grid-level energy conservation goals
17	Installation Method	Skid-mounted, pad-mounted, or foundation-fixed	Compatible with EPC design practices
18	Operating Temperature	-30°C to +55°C	Reliable performance in extreme climates
19	Total Load Loss	≤1.1% at full load	Reduces lifecycle energy loss and O&M costs
20	No-Load Loss	≤0.25% typical	Optimized for idle energy efficiency
21	Load Loss	≤0.9% under nominal conditions	Stable under peak demand
22	Impedance Range	6% to 8% typical	Ensures safe voltage control and short-circuit isolation
23	Short-Circuit Strength	Withstands up to 63 kA for 2 seconds	Built to handle system faults without degradation
24	Insulation Class	Class A or B (max 105°C–130°C)	Suitable for continuous high-stress operation
25	Winding Conductor	Copper (standard) or Aluminum (optional)	Copper preferred for lower resistance and heat loss
26	Tap Changer	On-load or off-circuit tap changer	Enables in-service voltage regulation
27	Bushing Type	Porcelain or polymer composite	Weather-resistant and bushfire-safe designs
28	Oil Volume	2,500–6,000 liters based on model	Sized to support extended thermal cycles
29	Service Life	35–40 years with proper maintenance	Long-term reliability for capital infrastructure
30	Sound Level	60–72 dB (depending on size)	Compliant with substation noise limits
31	Warranty Options	3 to 5 years standard	Extended terms available for EPC projects
32	Delivery Time	10–14 weeks	Standard production and logistics cycle
33	Custom Production	120–160 days for full customization	Includes engineering, prototyping, and QA process
34	Quotation Terms	Contact for pricing based on spec	Dependent on configuration, region, and volume

✅ 200MVA Transmission Power Transformer Voltage Range (220kV to 400kV)

ENERGY TRANSFORMER offers custom-designed 200MVA oil-immersed transmission power transformers with voltage ratings of 220kV, 230kV, 275kV, 330kV, and 400kV. These high-voltage units are optimized for bulk power transmission in utility grids and regional substations. Each unit supports high dielectric performance, meets insulation coordination per IEC 60076-3 and IEEE C57.12.00, and is suited for continuous operation in both temperate and harsh climates across Europe and North America.

✅ Transformer Core and Magnetic Circuit Design

To reduce no-load losses and audible noise, ENERGY TRANSFORMER uses high-grade cold-rolled grain-oriented (CRGO) silicon steel or amorphous core options. The magnetic flux path is optimized using 3D finite element analysis (FEA) to ensure uniform flux distribution and reduce local hot spots, enhancing the lifespan of your transmission power transformer under continuous load conditions.

✅ Cooling Methods for 200MVA High Voltage Transformers

Standard cooling methods include ONAN, ONAF, and optional OFAF/ODAF forced oil systems, designed for high power dissipation in 200MVA class transmission transformers. Redundant fans and oil pumps are integrated with automatic temperature and flow control systems to maintain optimal operating conditions. Customized designs for high-altitude and cold-weather performance (-40°C) are available for Canada, Scandinavia, and Alpine regions.

✅ Advanced Tap Changer and Voltage Regulation Options

Each 220–400kV transmission transformer is equipped with either an On-Load Tap Changer (OLTC) or No-Load Tap Changer (NLTC), depending on substation requirements. OLTC units feature automatic voltage regulation (AVR), motor drives, tap position indicators, and integration with SCADA systems. Tap range typically ±10% with 17 steps, customizable per regional voltage standards.

✅ Protection Relays and Digital Monitoring Systems

ENERGY TRANSFORMER integrates advanced protection systems including Buchholz relay, oil surge relay, winding temperature detectors (RTD/PT100), pressure relief valves, and gas analysis sensors. Optional integration with IEC 61850-compatible digital IEDs, partial discharge sensors, and cloud-based DGA systems provides predictive maintenance for critical transmission assets.

✅ 200MVA Transmission Transformer Dimensions and Footprint

A 200MVA 400kV unit may measure approximately 8–10 meters long, 4.5–5 meters wide, and 5–6.5 meters tall (assembled). Weight ranges from 120 to 180 metric tons (dry), and over 250 tons with oil and accessories. ENERGY TRANSFORMER supplies foundation drawings, lifting plans, and transportation schematics for crane, rail, or modular truck delivery.

✅ Shipping and Logistics for High Voltage Transformers

Each 220kV–400kV transmission power transformer is shipped with core-tank assembly, conservator, radiators, bushings, OLTC cabinet, and protection panels in separate crates or flat-rack containers. Transport complies with North American DOT and European ADR logistics codes. ENERGY TRANSFORMER provides full route studies, customs documents, and port-handling coordination for smooth importation.

✅ Testing, Quality Control & FAT Protocols

All units undergo routine, type, and special tests at ISO 17025-certified facilities per IEC, IEEE, and CSA requirements. FAT includes: applied voltage test, induced voltage test, impedance voltage, no-load and load loss, lightning impulse, switching surge, and temperature rise. ENERGY TRANSFORMER welcomes third-party inspection from DNV, TÜV, SGS, or customer-appointed engineers.

✅ Standards & Certification Compliance

The 200MVA transmission transformer complies with international grid codes and manufacturing standards: IEC 60076 series, IEEE C57, CSA C88, EN 50588, CE marking, and UKCA. Optional: UL Listed components, ISO 9001/14001/45001 factory management, NRTL approval, and RETIE certification for Latin American markets.

✅ Use Cases for 200MVA Grid Transformers

• Utility substations for national transmission grids (e.g., ISO, RTO, TSO-level)
• HVDC back-to-back stations and interconnection substations
• Wind and solar hybrid power plants above 300 MW capacity
• Industrial facilities with 220kV+ interconnection demand
• Nuclear and hydroelectric power plant evacuation systems

✅ Digital Twin and Asset Lifecycle Management

ENERGY TRANSFORMER offers a digital twin of each transmission power transformer, enabling lifetime tracking, predictive maintenance, and grid condition simulation via SCADA or EMS systems. This allows grid operators in North America and Europe to align with digitalization goals under NERC, ENTSO-E, or IEC 61850 frameworks.

✅ Environmental Considerations and Eco Design

All oil-filled transmission transformers use biodegradable, PCB-free insulating fluids (mineral or natural ester options). Low-noise design (≤65 dB at 1m) is compliant with European urban acoustic norms. ENERGY TRANSFORMER also supports SFRA testing, low-carbon footprint manufacturing, and end-of-life recycling documentation per RoHS and REACH regulations.

✅ Explore Related High Voltage Transformer Solutions

• 220kV–400kV Transmission Transformers | 50–500 MVA Grid-Scale Units
• 275kV/330kV Oil-Immersed Transformers | Long-Haul Power Transmission
• 230kV Substation Transformers | Designed for North American Utilities
• 400kV Step-Up/Step-Down Transformers | Renewable and Grid Intertie
• 110kV–220kV Large Power Transformers | For Utility and Industrial Substations

Featured Large-Capacity Oil-Immersed Power Transformers:

• 50 MVA 220kV/66kV Power Transformer – Three-Phase, ONAN/ONAF Cooling
• 80 MVA 275kV/110kV Transmission Transformer – High Efficiency Core, OLTC Ready
• 100 MVA 230kV Step-Down Transformer – ANSI/IEC Compliant, Outdoor Design
• 125 MVA 330kV Oil-Immersed Transformer – With Digital Monitoring & OLTC
• 150 MVA 220kV to 132kV Substation Transformer – Copper Windings, SCADA Interface
• 200 MVA 400kV Transmission Power Transformer – 3-Phase, Oil-Immersed, Grid-Class
• 250 MVA 275kV/220kV HV Transformer – For Regional and National Power Transfer
• 315 MVA 400kV Step-Up Transformer – Suitable for Nuclear & Hydro Generation
• 400 MVA 330kV/132kV Intertie Transformer – Designed for TSO-Level Grid
• 500 MVA 400kV Outdoor Transformer – Long Lifecycle, Certified to IEC/IEEE Standards

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Why Choose 220kV–400kV 200MVA Transmission Power Transformer – 3-Phase Oil-Immersed for High Voltage Substations?

Energy Transformer's 220kV–400kV oil-immersed transmission power transformer is designed for mission-critical power grid infrastructure. Built for high-capacity voltage transfer and system stability, this heavy-duty 3-phase transformer supports utility substations, regional interconnects, and cross-border power transmission.

✅ Optimized for Long-Distance High Voltage Transmission
Our 200MVA transmission transformer ensures seamless voltage transformation from generation stations or grid interties to regional load centers. It plays a vital role in maintaining voltage integrity and minimizing losses over long-distance lines.

✅ Durable Construction for Harsh Grid Environments
Encased in a corrosion-resistant steel tank, with high-grade core steel and precision-wound copper or aluminum conductors, this 220–400kV transformer delivers dependable thermal performance. ONAN/ONAF cooling ensures reliable operation even in high-load or high-temperature utility applications.

✅ Compliant with Global Utility Standards
Designed in accordance with IEC 60076, IEEE C57, ANSI, CSA, and EN standards, the 200MVA oil-immersed transmission power transformer is fully compliant with North American, European, and international grid code requirements—supporting utilities, IPPs, and TSOs.

✅ Fully Customizable Electrical Parameters
All major electrical specs—voltage ratios (e.g. 400kV/220kV), vector groups (YNyn0, YNd11, Dyn1), short-circuit impedance, tap changer options (OLTC or NLTC)—can be tailored to specific grid designs, SCADA protocols, or national interconnection rules.

✅ Efficient Production and International Fulfillment
With a streamlined production process and modular manufacturing model, Energy Transformer ensures rapid delivery (typically within 90 days) and full documentation support. Our transmission transformers are delivered across the USA, Canada, Germany, Spain, France, the UK, and other global power hubs.

📩 Contact Energy Transformer today to receive technical drawings, MVA sizing guidance, or project pricing for your 200MVA 220kV–400kV transmission power transformer. We deliver grid-stabilized, high-voltage solutions for next-generation utility and substation infrastructure.