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3-Phase Oil Immersed Distribution Transformers

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Oil-Immersed Transformer with OLTC

This transformer is an oil-immersed power transformer equipped with an On-Load Tap Changer (OLTC), which allows voltage regulation without interrupting power supply.oil-immersed transformer It is mainly composed of the core, windings, oil tank, insulating oil, cooling system and OLTC. 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.

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

It is specially designed for power systems where voltage stability is critical and load fluctuations are frequent， and is widly used in power transmission and distribution, industrial, and construction field.

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Basic Info.

Primary Voltage	35, 20 kV or others
Secondary Voltage	400 V
Vector Group	Dyn11, Dyn5, Yyn0 or others
Impedance	4%, 6%
Capacity (Power Rating)	4000 kVA, 4 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

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.

What is OLTC?

OLTC is On-Load Tap Changer which enables automatic voltage regulation under load, improving power quality and system stability without shutting down the transformer.

1. Allows voltage adjustment under load
2. Maintains stable output voltage
3. Improves power quality
4. Reduces voltage fluctuation impact
5. Suitable for long-distance power transmission

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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