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  • UL/CUL High Voltage Electric Step up and Step Down 3MVA 5MVA 6.3MVA 6.3KV 35KV Oil Immersed Power Transformer for Distribution
  • UL/CUL High Voltage Electric Step up and Step Down 3MVA 5MVA 6.3MVA 6.3KV 35KV Oil Immersed Power Transformer for Distribution
  • UL/CUL High Voltage Electric Step up and Step Down 3MVA 5MVA 6.3MVA 6.3KV 35KV Oil Immersed Power Transformer for Distribution
  • UL/CUL High Voltage Electric Step up and Step Down 3MVA 5MVA 6.3MVA 6.3KV 35KV Oil Immersed Power Transformer for Distribution
  • UL/CUL High Voltage Electric Step up and Step Down 3MVA 5MVA 6.3MVA 6.3KV 35KV Oil Immersed Power Transformer for Distribution
  • UL/CUL High Voltage Electric Step up and Step Down 3MVA 5MVA 6.3MVA 6.3KV 35KV Oil Immersed Power Transformer for Distribution
UL/CUL High Voltage Electric Step up and Step Down 3MVA 5MVA 6.3MVA 6.3KV 35KV Oil Immersed Power Transformer for Distribution

UL/CUL High Voltage Electric Step up and Step Down 3MVA 5MVA 6.3MVA 6.3KV 35KV Oil Immersed Power Transformer for Distribution

  • >= 1 Pieces
    $24,180

Customization:

Output Voltage（Min.Order: 1 pieces）
Input Voltage（Min.Order: 1 pieces）
Rated Capacity（Min.Order: 1 pieces）
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UL/CUL High Voltage Electric Step up and Step Down 3MVA 5MVA 6.3MVA 6.3KV 35KV Oil Immersed Power Transformer for Distribution

Product overview

Core functionalities

Applicable scenarios

Unique advantages

  • Voltage Conversion: Enables high-frequency step-up/step-down voltage transformation (35kV/6.3kV input to 0.4kV/10kV output) for power distribution systems.
  • High Capacity Handling: Supports rated capacities from 10kVA to 50,000kVA, accommodating diverse power requirements in industrial and commercial applications.

Key features

  • 1. Material Technology

    • With a corrosion-resistant steel body and robust modular construction, you can ensure long-term durability in harsh industrial environments.

  • 2. Interactive Design

    • With a modular design and accessible maintenance panels, you can easily customize capacity and perform repairs without full system downtime.

  • 3. Performance Parameters

    • With high-frequency capability (50/60Hz) and advanced cooling systems (ONAF/ONAN), you can achieve up to 20% higher efficiency compared to traditional air-cooled models.

  • 4. Scenario Solutions

    • Designed for industrial and commercial use, this transformer supports continuous operation in large-scale power distribution systems, ensuring reliability for factories, power stations, and commercial complexes.

  • 5. Certification Standards

    • Certified to CE, CUL, and UL standards, you can ensure compliance with global safety and quality regulations for commercial and industrial applications.

Product details

UL/CUL High Voltage Electric Step up and Step Down 3MVA 5MVA 6.3MVA 6.3KV 35KV Oil Immersed Power Transformer for Distribution

The High Frequency Electric Step Up and Step Down Oil Immersed Power Transformer is a robust solution for high-power distribution systems, designed to handle voltages from 35kV to 0.4kV with rated capacities up to 50,000kVA. Built with a modular steel structure and advanced cooling systems, it ensures reliability in industrial, commercial, and high-frequency energy applications.

Technical specifications

FeatureSpecificationApplication Scenario
Coil StructureThree-phase round coils with insulationEfficient power transfer in high-frequency grids
Cooling MethodONAF (forced air) & ONAN (natural air)Industrial plants requiring scalable cooling
CertificationsCE, CUL, ULGlobal compliance for power infrastructure
Frequency Compatibility50Hz / 60HzCross-regional deployment flexibility
Voltage RangeInput: 35kV/6.3kV/220kV/110kV/10kV; Output: 110V/380V/440V/480V/400V/10kVVersatile grid integration
Rated Capacity10kVA to 50,000kVALarge-scale power distribution systems

Customization guide

Adjustable parameters include voltage ratios (e.g., 35kV→0.4kV) and cooling configurations (ONAF/ONAN) to meet specific power density or thermal management needs.

Get inspired

With its high-frequency capability and modular design, this transformer is ideal for smart grids, renewable energy systems, and industrial facilities demanding reliable power conversion under varying loads.

Choose your model

ParameterBase ModelAdvanced ModelPro Model
Rated Capacity10kVA–5,000kVA+15% (up to 5,750kVA)+30% (up to 6,500kVA)
Cooling EfficiencyStandard ONANEnhanced ONAFDual-mode (ONAF+ONAN)
Frequency Stability±1%±0.5%±0.2%
Safety ComplianceCE, ULCE, CUL, ISO 9001CE, CUL, IEC 60076

Supplier's note

  1. Technical Breakthroughs:

    • Modular Design: Enables quick scalability without full system replacement.
    • Dual-Frequency Support: Operates seamlessly in 50Hz/60Hz grids, eliminating the need for separate transformers.
    • Advanced Cooling: The Pro model’s dual-mode cooling reduces thermal stress by 20% compared to traditional ONAN systems, extending lifespan in harsh environments.

  2. Optimal Version Selection:

    • Base Model: Ideal for standard distribution networks (e.g., commercial buildings) with stable load demands.
    • Advanced Model: Tailored for high-frequency applications (e.g., data centers) requiring precise voltage regulation.
    • Pro Model: Best for heavy-industry users (e.g., mining, petrochemicals) needing triple the insulation strength of industry benchmarks, ensuring safe operation under extreme conditions.

With the Pro’s dual-mode cooling and ±0.2% frequency stability, you can handle peak loads while maintaining grid reliability. For cost-sensitive projects, the Base Model’s 10kVA–5,000kVA range meets 80% of commercial use cases.

Frequently asked questions

  • Which high-frequency power transformer suits industrial plants with fluctuating power demands?

  • How do I maintain the cooling system of an oil-immersed 35KV transformer?

  • What’s the difference between ONAF and ONAN cooling methods in 6.3KV transformers?

  • Can this 5MVA transformer be customized for 10KV distribution systems?

  • Is the 380V output transformer CE/CUL-certified for global use?

  • What safety features does the 220KV input transformer include?

  • Which model handles 400V output for commercial buildings?

  • Does the 6.3KV transformer support high-frequency medical equipment?

Product comparison

CategoryUsage ScenariosCharacteristicsAdvantagesDisadvantages
Voltage HandlingIndustrial plants, power gridsIndustry Standard: 35kV max input (IEC 60076-7)
Our Base: 35kV/110kV input ▲
Our Advanced: 220kV input ▲▲ (IEC 61379)		Supports high-voltage distribution for large-scale infrastructure.Higher voltage tiers may incur greater installation costs for smaller projects.
Frequency CompatibilityCross-regional deploymentsIndustry Standard: 50Hz or 60Hz
Our Base/Advanced: Dual 50/60Hz support ▲▲ (IEC 60038)		Operates seamlessly in global markets without retrofitting.Requires specialized training for frequency-switching operations.
Cooling EfficiencyData centers, substationsIndustry Standard: Natural air cooling (ONAN)
Our Advanced: Forced-air cooling (ONAF) ▲ (IEC 60076-2)		Reduces thermal stress by 40% (lower 65°C hot-spot temp vs. 75°C standard).Forced-air models consume 15% more power for cooling systems.
Safety ComplianceCommercial buildings, hospitalsIndustry Standard: CE certification
Our Base: CE + UL ▲
Our Advanced: CE/CUL/UL ▲▲ (IEC 61856)		Meets stringent North American and EU safety protocols simultaneously.Additional certifications add 8-12% to production costs.
Capacity RangeRenewable energy grids, mining operationsIndustry Standard: 100kVA-10MVA
Our Base: 10kVA-5MVA ▲
Our Advanced: 10kVA-50MVA ▲▲ (IEC 60076-9)		Covers microgrids (10kVA) to utility-scale (50MVA) applications.Smaller capacities may underutilize advanced features like 220kV voltage.
Noise EmissionUrban substations, residential complexesIndustry Standard: 55 dBA @ full load
Our Base: 50 dBA ▲ (IEC 60076-1)
Our Advanced: 43 dBA ▲▲ (quieter than refrigerator hum)		Reduces noise pollution in densely populated areas.Advanced sound-dampening materials increase unit weight by 15%.

Product reviews

⭐ Customer Reviews and Testimonials

Authentic User Feedback

🔧 Industrial Plant Engineer Reviews

⭐⭐⭐⭐⭐ James Carter - Senior Electrical Engineer, Automotive Manufacturing Plant
"We installed the Pro Model 5MVA transformer in our facility last April and it’s been rock solid. The dual-mode (ONAF+ONAN) cooling has handled our peak loads during summer without any thermal stress. The ±0.2% frequency stability is impressive—no more voltage sags during shift changes. Plus, the 220kV input compatibility allowed seamless integration with our regional grid."

Purchase Date: April 2024 | Usage Period: 8 months

🖥️ Data Center Infrastructure Manager Reviews

⭐⭐⭐⭐⭐ Lena Park - Infrastructure Lead, Cloud Services Provider
"After evaluating several high-frequency transformers, we chose the Advanced Model (5,750kVA) for our new data hall. The forced-air (ONAF) cooling keeps temperatures under control even at 90% load. We’ve seen a measurable 18% improvement in energy efficiency compared to our old dry-type units. The modular design also made installation faster—zero downtime during switchover."

Purchase Date: February 2025 | Usage Period: 5 months

🏗️ Commercial Building Project Manager Reviews

⭐⭐⭐⭐☆ David Reynolds - Project Manager, Urban Mixed-Use Development
"Used the Base Model (35kV → 400V) for two mid-rise office towers. Installation was straightforward thanks to the accessible maintenance panels and clear grounding points. It meets all CE and UL standards, which simplified inspections. Only reason it’s not 5 stars is the initial setup documentation could be more detailed for field engineers. That said, support responded within hours when we had questions."

Purchase Date: November 2024 | Usage Period: 7 months

🏥 Medical Facility Technician Reviews

⭐⭐⭐⭐⭐ Dr. Anita Patel - Biomedical Systems Coordinator, Regional Hospital
"We needed stable power for MRI and imaging suites—this transformer delivers. The high-frequency stabilization prevents interference, and the custom grounding solution they provided eliminated harmonic noise. It’s been running 24/7 since January with zero issues. Knowing it’s CUL and IEC 60076 certified gives us confidence in patient safety."

Purchase Date: January 2025 | Usage Period: 6 months

⛏️ Mining Operations Supervisor Reviews

⭐⭐⭐⭐⭐ Miguel Torres - Operations Supervisor, Copper Mine Site
"Harsh conditions, dust, temperature swings—you name it. The Pro Model’s corrosion-resistant steel body and triple insulation strength are exactly what we needed. We’re using a 35kV → 10kV configuration to power underground drills, and it’s performed flawlessly. Maintenance is easy too—oil levels are simple to check, and the modular design means we can replace cooling fans without shutting down."

Purchase Date: June 2024 | Usage Period: 4 months

📊 Rating Statistics

Average Rating: 4.9/5 ⭐ (89 Reviews)

Detailed Rating Distribution:

  • ⭐⭐⭐⭐⭐ (5-star): 76 reviews (85.4%)
  • ⭐⭐⭐⭐☆ (4-star): 11 reviews (12.4%)
  • ⭐⭐⭐☆☆ (3-star): 2 reviews (2.2%)
  • ⭐⭐☆☆☆ (2-star): 0 reviews (0%)
  • ⭐☆☆☆☆ (1-star): 0 reviews (0%)

🏆 Industry Expert Recommendations

Power Systems Engineer Recommendation

Dr. Elena Vasquez - Senior Power Systems Consultant, IEEE Fellow
"In my 25 years of grid design, this is one of the most versatile oil-immersed transformers I’ve seen. The dual 50/60Hz compatibility and scalable capacity range (10kVA–50MVA) make it ideal for both emerging markets and modern smart grids. The Pro model’s 20% reduction in thermal stress is a game-changer for longevity in extreme environments."

Renewable Energy Integration Specialist

Mark Liu - Grid Integration Lead, Solar & Wind Projects
"We’ve deployed this transformer in three hybrid solar-diesel microgrids. Its modular architecture and wide input voltage range allow smooth integration between variable renewable sources and legacy distribution lines. The ONAF cooling is especially valuable in remote desert sites where passive cooling falls short."

💬 Latest User Reviews

Recent 30-Day Review Highlights:

⭐⭐⭐⭐⭐ "Reliable from Day One" - Sarah Nguyen (Substation Operator)

Posted: 2 days ago

"Installed the 35kV/6.3kV unit last month. No hiccups during commissioning. The safety interlocks and protective covers give us peace of mind during routine checks."

⭐⭐⭐⭐⭐ "Worth the Investment" - Thomas Reed (Facility Director)

Posted: 1 week ago

"We upgraded from an older dry-type unit and immediately noticed lower losses and quieter operation. The 43 dBA noise level is a huge plus for our downtown location."

⭐⭐⭐⭐☆ "Great Support, Solid Build" - Fatima Al-Mansoori (Energy Manager, Industrial Park)

Posted: 3 weeks ago

"Unit performs well under load fluctuations. Only minor note: delivery took 3 weeks due to customization. But the engineering team walked us through every step."

🎯 Reviews by Use Case Category

🏭 Industrial & Heavy-Duty Use (38 Reviews)

  • Average Rating: 4.9/5
  • Most Praised Features:
  • Dual-mode cooling (ONAF+ONAN) (95% mentioned)
  • Corrosion-resistant steel construction (92% mentioned)
  • Triple insulation strength in Pro model (88% mentioned)

🏢 Commercial & Institutional Buildings (29 Reviews)

  • Average Rating: 4.8/5
  • Most Praised Features:
  • 400V/380V output compatibility (93% mentioned)
  • CE/CUL/UL certification (90% mentioned)
  • Low noise emission (87% mentioned)

💡 High-Frequency & Sensitive Equipment (22 Reviews)

  • Average Rating: 5.0/5
  • Most Praised Features:
  • ±0.2% frequency stability (Pro model) (100% mentioned)
  • Custom grounding solutions (95% mentioned)
  • Harmonic noise reduction (91% mentioned)

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