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3-Phase Oil Immersed Distribution Transformers

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S11 10kv/20kv/35kv Oil Immersed High Voltage Distribution Transformer

S11 10kv/20kv/35kv Oil Immersed High Voltage Distribution Transformer

Taili oil-immersed transformer is mainly composed of the core, windings, oil tank, insulating oil, and cooling system. The core is made of laminated silicon steel sheets with high magnetic permeability to conduct magnetic flux. The windings include high-voltage and low-voltage windings, usually made of copper or aluminum. The oil tank is filled with insulating oil for insulation and heat dissipation, while the cooling system uses natural convection or forced circulation to maintain proper operating temperature.

This 3-phase oil-immersed distribution transformer is designed for medium-voltage power distribution systems, featuring a side-mounted low-voltage outlet structure, which is widely used in industrial and utility applications.

Our oil transformers are designed and manufactured in accordance with IEC, IEEE, ANSI, and DOE standards, and are fully CE, SGS, and ASTA certified.

Taili's standard energy-saving three-phase oil-immersed transformer is developed through the application of new materials, new manufacturing processes, and a combination of independent innovation and imported technologies. It is widly used in power transmission and distribution, industrial, and construction field.

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Basic Info.

TAILI S11 oil-immersed distribution transformers are designed for 10kV, 20kV and 35kV medium-voltage distribution systems. Available 1000kVA and 1500kVA configurations combine a low-loss magnetic core, oil insulation and customizable voltage, connection and terminal arrangements.

The series is suitable for utility networks, industrial plants, substations, mining facilities and infrastructure projects requiring dependable medium-voltage power distribution.

Primary Voltage	35, 34.5, 24, 20, 15, 13.8, 13.2, 11, 10.5, 10, 6.3, 6 kV or others
Secondary Voltage	600 V, 480 V, 415 V, 400 V, 380 V or others
Vector Group	Dyn11, Dyn5, Yyn0 or others
Impedance	4%, 6%
Capacity (Power Rating)	1000 kVA, 1 MVA, 1500 kVA, 1.5 MVA
H.V. Tap Range	±2 × 2.5% or others
BIL (Basic Insulation Level)	30–150 kV
Standards	IEC, IEEE, ANSI, DOE
Certificates	CE, SGS, CNAS
Usage	Rectifier Transformer, Combined Transformer, Power Transformer, Distribution Transformer

Select the Right Voltage Class

Voltage Class	Typical Use
10kV	Urban and rural distribution, factories and commercial projects
20kV	Regional distribution networks requiring greater supply capability
35kV	Industrial substations, mining, utilities and infrastructure systems

Features of Oil immersed transformer

1. Made of high-magnetic-permeability cold-rolled silicon steel sheets, effectively reducing no-load loss.

2. The winding conductor can be selected as high-quality copper or aluminum from well-known manufacturers according to customer requirements, providing excellent conductivity.

3. Low noise and fully sealed.

4. The corrugated oil tank is equipped with a pressure relief valve to isolate air and slow down oil deterioration, achieving true maintenance-free operation.

5. Corrugated walls provide three functions—cooling, breathing, and expansion—making the transformer self-adaptive.

6. The core undergoes vacuum annealing and epoxy curing, giving it a designed service life of over 40 years.

7. Side-Mounted Low Voltage Outlet: It is convenient cable connection and easy to intergrate with LV switchgear.

S11 10kV/20kV/35kV Oil-Immersed Transformer Construction

Low-Loss Magnetic Core

High-permeability cold-rolled silicon steel sheets are used to reduce core loss and no-load current. Guaranteed loss values are provided in the model-specific technical datasheet.

Custom Winding Design

Copper or aluminum conductors can be selected according to project requirements. The winding structure is designed to provide dielectric strength and mechanical resistance under normal operation and fault conditions.

Oil Tank and Cooling System

The oil tank provides insulation protection and heat dissipation. Tank structure, radiators and surface coating can be adapted for outdoor, high-humidity, coastal or high-pollution installations.

Flexible Terminal Arrangement

Standard bushings, cable boxes and side-mounted low-voltage outlets can be configured according to the substation layout and cable-entry requirements.

Optional Accessories

Depending on transformer rating and project specification, available accessories can include:

· Oil temperature indicator
· Oil level indicator
· Pressure relief device
· Buchholz relay for conservator-type designs
· Winding temperature indicator
· Drain and sampling valves
· Marshalling box
· HV and LV cable boxes
· Bidirectional rollers
· Corrosion-resistant coating
· Online monitoring contacts

The final accessory list is confirmed in the approved drawing and bill of materials.

Advantages and characteristics of S11 10kV/20kV/35kV Oil-Immersed Transformer

01 Production Equipments of oil transformers

1500kVA Oil Type Transformer for Africa

02 Oil immersed transformer assembling workshop

1500kVA Oil Type Transformer for Africa

03 Ex-factory test for oil transformers

1500kVA Oil Type Transformer for Africa

04 Oil-Immersed Transformer Finished Goods Area

1500kVA Oil Type Transformer for Africa

Application scenarios

Power transmission and distribution networks

They handle voltage conversation between 35/33/20/15/13.8/11kV networks and secondary distribution such as 400/230v.

Industrial

Industrial parks ，manufacturing plants，Oil, gas, and mining projects，Data centers and telecommunication stations

Commercial and civil buildings

The power distribution system of high-rise buildings, shopping malls, and hospitals is directly installed in the low-voltage distribution room and provides 0.4kV power supply.

Package and Shipping

1500kVA Oil Type Transformer for Africa

Service System

Pre-sales support

- Provide customized power distribution scheme design to optimize cabinet size, equipment layout and product configuration;

- For special needs (such as non-standard voltage, explosion-proof certification), provide detailed technical solutions within 12 hours.

Routine Test

Measurement of winding resistance

Measurement of voltage ratio

Check of vector group

Mesurement of impendance voltage and load loss

Measurement of no load oss and current

Separate-source voltage withstand test

Induced overvoltage withstand test

Dimension checking

Type Test

Lighting impulse test

Temperature rise test

After-sales guarantee

- Quick response: reply to fault report within 24 hours, remote debugging or on-site service within 48 hours (domestic);

- Regular return visits: inspect the operation status of the equipment free of charge every year and provide maintenance suggestions;

- Transparent service: the cause of the failure is explained in writing, the maintenance cost is priced according to the market standard, and the cost is refunded on the spot for valid complaints;

- Warranty policy: 1-3 years warranty for the whole machine (according to the model), lifetime costprice spare parts supply.

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