Oil Filled Type Distribution Transformer

The Oil Filled Type Distribution Transformer is a widely used solution for reliable power distribution in utility, industrial, and commercial networks. Manufactured by Lugao Power Co., Ltd, a professional China transformer manufacturer and supplier, this transformer uses insulating oil to provide both cooling and electrical insulation. With stable performance, low loss design, and durable structure, it is an ideal choice for long-term electrical infrastructure projects.

Parameter

kVA	Voltage (kV) w		Vector Group	Losses		No-load Current	Weight(kg)		Overall dimension (mm)
	H.V.	L.V.		No-load loss	Load loss		Oil weight	Total weight	L	W	H
20	6 6.3 10 10.5 11 13.2	380 400 415 433	Yyno Dyn11 Yzn11	90	530	2.3	55	230	720	440	855
30				100	600	2.1	75	305	750	500	990
50				130	870	2.0	80	405	800	480	1030
63				150	1040	1.9	95	455	830	615	1060
80				180	1250	1.9	105	510	840	580	1115
100				200	1500	1.8	120	530	890	645	1145
125				240	1800	1.7	130	670	910	600	1185
160				280	2200	1.6	140	810	910	700	1280
200				340	2600	1.5	160	890	1000	760	1240
250				400	3050	1.4	175	1020	1285	730	1290
315				480	3650	1.4	185	1170	1280	740	1385
400				570	4300	1.3	215	1410	1310	750	1432
500				680	5100	1.2	260	1645	1365	765	1510
630				810	6200	1.1	310	2070	1485	815	1615
800				980	7500	1.0	370	2445	1640	930	1590
1000				1150	10300	1.0	425	2800	1860	1120	1630
1250				1360	12000	0.9	480	3320	1860	1120	1830
1600				1640	14500	0.8	550	4175	1975	1175	1900

What is an Oil Filled Type Distribution Transformer?

An Oil Filled Type Distribution Transformer is a transformer where the core and windings are fully immersed in insulating oil. The oil acts as both a cooling medium and electrical insulation, ensuring safe and efficient operation.

Main Characteristics

• High insulation strength using transformer oil
• Efficient heat dissipation through oil circulation
• Robust steel tank structure
• Suitable for medium and low voltage distribution systems
• Long operational lifespan

What Are the Advantages?

• Reliable operation – Oil provides strong insulation and prevents electrical faults.
• Efficient cooling – Heat generated by the transformer is absorbed and transferred by insulating oil.
• Long service life – Stable internal environment protects windings and core.
• Energy efficient – Optimized silicon steel core reduces energy loss.
• Suitable for heavy loads – Designed for continuous operation in demanding power systems.

Why Do Transformers Use Oil?

In an Oil Filled Type Distribution Transformer, insulating oil plays several important roles in ensuring reliable performance.

• Electrical insulation – Prevents short circuits between internal components.
• Heat dissipation – Transfers heat away from the transformer core and windings.
• Arc suppression – Helps control internal electrical discharges.
• Component protection – Reduces oxidation and aging of internal materials.

What Are the Common Cooling Methods?

Different cooling methods are used in Oil Filled Type Distribution Transformer designs depending on power capacity and operating environment.

• ONAN (Oil Natural Air Natural) – Natural oil circulation and natural air cooling.
• ONAF (Oil Natural Air Forced) – Natural oil circulation with fan-assisted air cooling.
• OFAF (Oil Forced Air Forced) – Forced oil circulation with external cooling fans.
• OFWF (Oil Forced Water Forced) – Forced oil circulation with water cooling systems.

What Are Common Maintenance Issues?

Routine maintenance helps ensure the long-term reliability of an Oil Filled Type Distribution Transformer.

• Periodic oil quality inspection
• Checking oil level and temperature
• Inspecting bushings and electrical connections
• Monitoring transformer load and operating conditions
• Testing insulation resistance and protective systems

Why Choose Lugao?

• Professional transformer manufacturer with advanced production lines
• Strict quality control from raw material procurement to final testing
• Rich export experience supporting international power infrastructure projects
• Flexible customization for voltage levels, capacities, and standards
• Reliable technical support for engineering and installation requirements

FAQ

1. How long does an oil filled distribution transformer typically last?

With proper maintenance and operating conditions, the service life of an oil filled transformer can exceed 25 years.

2. Is an Oil Filled Type Distribution Transformer suitable for outdoor installation?

Yes. Most oil filled transformers are designed for both indoor and outdoor applications depending on the enclosure and project design.

3. Can Lugao customize transformer specifications?

Yes. Lugao provides customized solutions including voltage levels, cooling methods, and structural configurations to meet specific project requirements.

4. What standards do these transformers follow?

The transformers can be manufactured according to IEC, ANSI, or other international electrical standards depending on customer needs.

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