Oil transformer S(F)11-35кV

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Description

 

S(F)11-35kV Oil-Immersed Power Transformer for Industrial Projects

 

The S(F)11-35kV oil-immersed transformer is a high-voltage distribution transformer designed for 35kV power systems, widely used in industrial substations, energy infrastructure, and heavy-duty electrical networks. This transformer belongs to the S11 series, known for its low no-load loss, high operational efficiency, and enhanced insulation performance.

The “(F)” designation refers to fully-sealed, non-explosion tank design, ensuring higher safety, better insulation performance, and longer operational life, even under harsh outdoor or industrial conditions.

Parameters

 

Key Features of S(F)11-35kV Oil Transformer

FeatureAdvantage for Industrial Use
Rated Voltage: 35kV/10kV/0.4kVSupports high-voltage to low-voltage step-down applications
Low No-Load and Load LossesIncreases energy efficiency and reduces operational costs
Oil-Immersed Cooling System (ONAN)Maintains optimal temperature and enhances reliability
Fully Sealed Tank StructurePrevents air, dust, and moisture ingress, extending service life
High Mechanical StrengthWithstands short-circuit forces and grid fluctuations
Safe and Maintenance-FriendlyNo oil leakage, minimal routine maintenance required
Optional F-Class InsulationFor high-temperature environments or outdoor use

 

Applications of the S(F)11-35kV Transformer in Industrial Projects

The S(F)11-35kV transformer is ideal for medium- and large-scale industrial facilities that require reliable power transformation from 35kV transmission lines to usable voltage levels for internal consumption.

 

Typical applications include:

  • Electrical substations for industrial zones
  • Mining, metallurgy, and steel manufacturing
  • Chemical processing and petrochemical refineries
  • Cement and building material factories
  • Energy infrastructure (wind farms, solar plants, hydropower stations)
  • High-rise commercial complexes and urban power grids

 

Benefits of S(F)11-35kV Transformers in Industrial Projects

1. Energy Efficiency

The advanced core design and high-quality materials result in lower no-load losses, reducing energy waste and electricity bills.

2. Long Lifespan & Low Maintenance

Thanks to the sealed tank and mineral oil cooling system, the transformer operates 20+ years with minimal upkeep, making it perfect for remote or difficult-to-access sites.

3. Safety and Environmental Protection

The non-explosion-proof design reduces the risk of accidents, and sealed oil systems prevent contamination of the environment.

4. Low Noise Operation

Optimized magnetic core construction results in quiet performance, ideal for installation near sensitive or residential areas.

Typical Technical Specifications

ParameterSpecification
Rated VoltagePrimary: 35kV / Secondary: 10kV or 0.4kV
Capacity Range400kVA to 25000kVA (customizable)
Frequency50Hz / 60Hz
Vector GroupDyn11 / Yyn0 / Yd11
No-Load LossUp to 30–40% lower than traditional designs
Load LossOptimized for medium-load efficiency
Insulation LevelBIL 170kV (Primary), 38kV (Secondary)
Cooling MethodONAN (Oil Natural Air Natural)
Core MaterialCold-rolled grain-oriented silicon steel
Oil TypeMineral insulating oil / Optional FR3 eco-oil

 

Comparison: S(F)11 vs Traditional 35kV Transformers

FeatureS(F)11-35kV TransformerConventional Transformer
Core LossLower due to optimized S11 coreHigher
Tank TypeFully sealed, non-leakingConservator type with breather
Maintenance RequirementsVery lowRegular oil checks and breather service
Environmental ProtectionBetter sealing, eco-oil optionsStandard
Installation FlexibilityCompact, safe for both indoor/outdoorBulky, needs dedicated housing

✅ The S(F)11-35kV transformer is ideal for modern infrastructure and low-maintenance energy systems.

 

Why Choose the S(F)11-35kV Transformer for Your Industrial Project?

High-efficiency solution for long-term cost savings

Ideal for renewable energy and smart grid integration

Safe for outdoor, dusty, or corrosive environments

Compliant with IEC, GB, and ISO quality standards

Customizable windings, tap changers, or insulation levels

 

Estimated sizes for S(F)11-16000/35

Oil transformer

Order S(F)11-35kV Oil-Immersed Transformers for Your Next Project

We provide a full range of S(F)11-35kV sealed oil transformers designed for high-performance industrial use. From technical consultation to manufacturing and delivery, we support every stage of your project.

  • Rated capacities from 400kVA to 25000kVA
  • Factory-tested and certified products
  • Fast production and worldwide delivery OEM/ODM services available for EPC contractors and utilities

Solutions

 

METTZ Group stands as a consortium of Chinese electrical firms, renowned for its expertise in manufacturing electrical equipment. We are specialized in crafting a comprehensive suite of transmission and distribution equipment, covering a wide voltage range from 0.4 to 40.5 kV. Our commitment lies in delivering reliable and stable products to our clientele, encompassing vacuum circuit breakers (VCB), gas-insulated switchgear modular units (RMU), solid insulated switchgear (SIS) panels, air insulated switchgear (AIS) panels, and dry compressed air insulated switchgear panels (DIS).

Since our inception, METTZ Group has been at the forefront of adopting international cutting-edge technologies and equipment. We pride ourselves on our extensive collaboration and dialogue with leading experts in the electrical technology sector, both within China and internationally. Our offerings are tailored to meet the specific needs of our clients, including Original Equipment Manufacturer (OEM) services, customization of products to unique parameters and dimensions, all in alignment with our customers’ specifications.

METTZ Group is dedicated to innovation, quality, and customer satisfaction, ensuring that we remain a preferred partner for electrical equipment solutions worldwide.

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