500kVA 11kV Dry-Type vs Oil-Immersed Transformer: Advantages, Disadvantages & Suitable Scenarios

GNEE is a professional and experienced power transformer manufacturer and exporter, focusing on R&D, production and global sales of distribution and power transformers for more than 18 years.

We supply reliable 500kVA 11kV dry-type transformers and 500kVA 11kV oil-immersed transformers that comply with IEC, GB and international market standards.

Choosing between dry-type and oil-immersed transformers directly affects safety, cost, maintenance and service life.

This professional comparison helps you select the most suitable 500kVA 11kV transformer for your project.

 

Modern manufacturing workshop showing assembly of 500kVA 11kV dry-type and oil-immersed transformers

 

 

The 500kVA 11kV dry-type transformer uses epoxy resin or vacuum pressure impregnation (VPI) for insulation, without insulating oil.

It relies on air for cooling and insulation, making it a clean and safe solution for indoor and high-safety environments.

This type of transformer is widely used in urban power grids, commercial buildings and infrastructure projects.

Its oil-free structure eliminates fire, leakage and pollution risks, which is why many indoor and high-density power supply projects prefer dry-type solutions.

 

 

The 500kVA 11kV oil-immersed transformer uses transformer oil as insulation and cooling medium.

The core and windings are immersed in oil inside a sealed steel tank, with radiators for heat dissipation.

It features high efficiency, low loss and strong overload capacity, making it ideal for outdoor, industrial and large-scale power distribution.

With mature technology and stable performance, it remains the most widely used type for outdoor power supply projects worldwide.

 

 

Advantages

• High safety: No oil, no fire hazard, no leakage risk
• Environmentally friendly: Suitable for indoor, basement and public places
• Low maintenance: No oil replacement or regular oil testing required
• Good fire resistance: Meets high fire-protection standards for buildings

 

Disadvantages

• Higher initial cost than oil-immersed transformers
• Larger size and weight under the same capacity
• Lower overload capacity compared with oil-immersed type
• Higher noise under full-load operation

 

 

Advantages

• Lower cost with higher cost-performance ratio
• High efficiency & low energy loss
• Strong overload capacity for long-term stable operation
• Compact structure and mature manufacturing technology

 

Disadvantages

• Fire and leakage risks if not properly maintained
• Not ideal for indoor use due to oil medium
• Requires regular oil inspection and replacement
• Needs separate outdoor installation space

 

 

Best for 500kVA 11kV Dry-Type Transformer

• Indoor places: shopping malls, hospitals, office buildings, basements
• High-safety areas: schools, airports, data centers, residential areas
• Environment-sensitive projects: urban power distribution, public infrastructure

 

Best for 500kVA 11kV Oil-Immersed Transformer

• Outdoor industrial sites: factories, mines, construction sites
• Rural and urban outdoor power grids
• Large power supply stations with sufficient installation space
• Projects with strict budget and high efficiency requirements

 

Clear visual comparison of 500kVA 11kV dry-type and oil-immersed transformer appearance and structure

 

 

Parameter	500kVA 11kV Dry-Type Transformer	500kVA 11kV Oil-Immersed Transformer
Rated Capacity	500kVA	500kVA
Input Voltage	11kV	11kV
Output Voltage	0.4kV/0.415kV (customizable)	0.4kV/0.415kV (customizable)
Frequency	50Hz/60Hz	50Hz/60Hz
Insulation Type	Epoxy resin/VPI	Mineral insulating oil
Cooling Type	AN/AF (Air Natural/Air Forced)	ONAN (Oil Natural Air Natural)
Protection Class	IP20/IP23/IP30	IP00/IP20
No-Load Loss	≤980W	≤810W
Load Loss	≤5700W	≤4900W
Operating Temperature	-30℃ ~ +40℃	-25℃ ~ +40℃
Installation	Indoor/outdoor (with enclosure)	Outdoor mainly
Standards	IEC 60076, GB 1094	IEC 60076, GB 1094

 

 

As a professional manufacturer, GNEE provides both 500kVA 11kV dry-type transformers and 500kVA 11kV oil-immersed transformers with full customizability.

 

We offer strict factory testing, complete certification, fast global delivery and professional after-sales support.

 

Our engineers provide free selection suggestions based on your installation environment, load demand and budget to ensure you get the most cost-effective solution.

 

 

Choosing the right 500kVA 11kV dry-type or oil-immersed transformer depends on your installation environment, safety requirements, budget and maintenance conditions.

Dry-type models suit high-safety indoor projects, while oil-immersed models provide better efficiency and cost performance for outdoor use.

Request A Quote

 

GNEE has rich experience in customizing and supplying 500kVA 11kV transformers for global customers.

 

If you need professional selection advice, detailed technical drawings or a free official quote, contact GNEE now and send your inquiry today!