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oil immersed transformer

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Pad-Mounted Transformer

Oil Immersed Transformers — 10kV to 35kV
Oil Immersed Transformers — 10kV to 35kV
Oil Immersed Transformers — 10kV to 35kV
Oil Immersed Transformers — 10kV to 35kV
Oil Immersed Transformers — 10kV to 35kV
Oil Immersed Transformers — 10kV to 35kV
Oil Immersed Transformers — 10kV to 35kV
Oil Immersed Transformers — 10kV to 35kV

Oil Immersed Transformers — 10kV to 35kV

Oil Filled Transformer Distribution Transformer Power Transformer Three Phase ONAN Self-Cooled Hermetically Sealed 50Hz / 60Hz IEC Standard

EverWins oil immersed transformers cover rated voltages from 10kV to 35kV with capacities ranging from 30kVA to 20,000kVA. Built for outdoor power distribution, industrial supply and utility grid applications, these units use mineral insulating oil for both cooling and dielectric insulation. We supply single phase and three phase configurations with Dyn11 or Yyn0 winding connections. Every transformer ships fully tested from our Guangdong factory.


· Input voltage: 10 / 11 / 15 / 20 / 22 / 33 / 35kV
· Output voltage: 0.4kV, 11kV
· Frequency: 50Hz and 60Hz
· Cooling: ONAN (oil natural, air natural) self-cooled
· Winding material: copper or aluminum, selectable per order
· Core: cold-rolled grain-oriented silicon steel
· Tap changer: no-load ±5% or ±2×2.5%; on-load tap changer optional
· Structure options: hermetically sealed (no conservator) or conservator type
· Compliance: IEC 60076, GB standards; export configurations available
· Custom engineering: voltage, capacity, tap range, terminal layout and environmental adaptations per your site requirements

Service & Delivery
MOQ: 1 unit for standard models
Lead time: 30–45 days for standard; 45–60 days for custom-engineered units
Shipping: FOB, CIF, door-to-door available; export packing with wooden crate and steel frame
Warranty: 24 months from commissioning date
Custom support: single-line diagram review, drawing confirmation, factory acceptance test (FAT) witness
After-sales: technical support via email, phone and video call; on-site commissioning guidance available

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Specifications

ParameterSpecification
Rated Input Voltage10 / 11 / 15 / 20 / 22 / 33 / 35 kV
Rated Output Voltage0.4 kV, 11 kV
Rated Capacity30 – 20,000 kVA
PhaseSingle phase / Three phase
Frequency50 Hz / 60 Hz
Winding ConnectionDyn11, Yyn0 (others on request)
HV Tapping Range±5% or ±2×2.5% (no-load); on-load optional
Cooling MethodONAN (Oil Natural Air Natural); ONAF optional
Winding MaterialCopper or Aluminum
Core MaterialCold-rolled grain-oriented silicon steel
Insulating OilMineral oil (standard); vegetable oil on request
Tank StructureHermetically sealed or conservator type
StandardsIEC 60076, GB/T 6451, GB 20052
Ambient Temperature-25°C to +40°C (special designs for extreme climates)
Altitude≤1000m standard; high-altitude derating available
Special Environment CodesP (plateau), C (anti-corrosion), T (dry tropics), H (humid tropics)


Oil Immersed Transformer Product Range

11–35kV Oil Immersed Distribution Transformer (S11/S13 Series)

11–35kV Oil Immersed Distribution Transformer (S11/S13 Series)



Oil Immersed Transformer Quality & Engineering

Every unit starts with cold-rolled grain-oriented silicon steel core and vacuum-dried insulation to keep no-load loss low and extend service life. We run full routine testing on each transformer before shipment — turns ratio, insulation resistance, load loss, induced voltage withstand — so you receive equipment that is ready to energize on site. Our engineering team configures each order to your actual grid conditions, from tap range and winding material down to altitude derating and climate protection code.
Low no-load loss with CRGO silicon steel core
Vacuum oil filling for moisture-free insulation
Noise level optimized through core clamping design
Full IEC 60076 routine test on every unit
Site-specific engineering for voltage, climate and altitude



Full Testing Before Shipment

We run routine tests on every oil immersed transformer before it leaves the factory. This includes turns ratio, winding resistance, insulation resistance, no-load loss, load loss, induced overvoltage withstand, and applied voltage withstand. For projects that require it, we also perform type tests and special tests such as short-circuit withstand, temperature rise, partial discharge and impulse voltage testing. All test data is documented and included with your shipment.



Configured to Your Grid

Every power grid has its own voltage standard, frequency, altitude, climate and load pattern. A transformer that works in coastal Southeast Asia may fail in a high-altitude mining site in South America. We configure each unit based on your actual project data — your single-line diagram, your site elevation, your ambient temperature range and your local utility requirements. You tell us the conditions, we handle the engineering.

More About everwins

EverWins is a transformer, switchgear and substation manufacturer based in Guangdong, China. With 30 years in the power transmission and distribution industry and a 70,000m² production facility, we supply factory-direct to projects in over 30 countries.

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FAQs

What is the difference between oil immersed and oil filled transformers?

What is the difference between oil immersed and oil filled transformers?

They are the same product. "Oil immersed transformer" follows IEC terminology and is widely used in international markets. "Oil filled transformer" is common in North American ANSI/IEEE standards. Both refer to a transformer where the core and windings sit inside a tank filled with insulating oil for cooling and dielectric insulation.

What is the difference between oil immersed and oil filled transformers?

They are the same product. "Oil immersed transformer" follows IEC terminology and is widely used in international markets. "Oil filled transformer" is common in North American ANSI/IEEE standards. Both refer to a transformer where the core and windings sit inside a tank filled with insulating oil for cooling and dielectric insulation.

What is the difference between oil immersed and oil filled transformers?

They are the same product. "Oil immersed transformer" follows IEC terminology and is widely used in international markets. "Oil filled transformer" is common in North American ANSI/IEEE standards. Both refer to a transformer where the core and windings sit inside a tank filled with insulating oil for cooling and dielectric insulation.

Oil Immersed Transformer: Technical Guide

How an Oil Immersed Transformer Works
An oil immersed transformer operates on the principle of electromagnetic induction — the same as any conventional transformer. The primary winding receives medium voltage AC power and generates a magnetic flux in the silicon steel core. This flux induces a voltage in the secondary winding at a lower (or higher) level depending on the turns ratio. What sets an oil immersed transformer apart is that the entire core-and-coil assembly sits inside a steel tank filled with insulating oil.

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