Differences Between Dry Type and Oil Immersed Transformers

Transformers are essential components in the electrical distribution system, responsible for stepping up or stepping Down voltage Levels to ensure efficient Power Transmission. There are two main types of transformers commonly used in the industry: dry type transformers and oil immersed transformers. Each type has its own set of advantages and disadvantages, making them suitable for different applications.

model	Rating\\u00a0capacity\\u00a0\\uff08KVA\\uff09	Off-load\\u00a0losses\\uff08W\\uff09	Voltage\\u00a0combination\\u00a0\\uff08KV\\uff09	Load\\u00a0losses\\uff08W\\uff09	Off-load\\u00a0current\\u00a0\\uff08%\\uff09	Short-circuit\\u00a0voltage\\u00a0\\uff08%\\uff09
S11-M-30	30	100	6,6.3,10,10.5,11/0.4	600	2.3	4.0
S11-M-50	50	130	6,6.3,10,10.5,11/0.4	870	2.0	4.0
S11-M-63	63	150	6,6.3,10,10.5,11/0.4	1040	1.9	4.0
S11-M-80	80	180	6,6.3,10,10.5,11/0.4	1250	1.9	4.0
S11-M-100	100	200	6,6.3,10,10.5,11/0.4	1500	1.8	4.0
S11-M-125	125	240	6,6.3,10,10.5,11/0.4	1800	1.7	4.0
S11-M-160	160	280	6,6.3,10,10.5,11/0.4	2200	1.6	4.0
S11-M-200	200	340	6,6.3,10,10.5,11/0.4	2600	1.5	4.0
S11-M-250	250	400	6,6.3,10,10.5,11/0.4	3050	1.4	4.0
S11-M-315	315	480	6,6.3,10,10.5,11/0.4	3650	1.4	4.0
S11-M-400	400	570	6,6.3,10,10.5,11/0.4	4300	1.3	4.0
S11-M-500	500	680	6,6.3,10,10.5,11/0.4	5100	1.2	4.0
S11-M-630	630	810	6,6.3,10,10.5,11/0.4	6200	1.1	4.5
S11-M-800	800	980	6,6.3,10,10.5,11/0.4	7500	1.0	4.5
S11-M-1000	1000	1150	6,6.3,10,10.5,11/0.4	10300	1.0	4.5
S11-M-1250	1250	1360	6,6.3,10,10.5,11/0.4	12800	0.9	4.5
S11-M-1600	1600	1640	6,6.3,10,10.5,11/0.4	14500	0.8	4.5
S11-M-2000	2000	2280	6,6.3,10,10.5,11/0.4	17820	0.6	5.0
S11-M-2500	2500	2700	6,6.3,10,10.5,11/0.4	20700	0.6	5.0
S11-M-30-	30	90	20,22/0.4	660	2.1	5.5
S11-M-50-	50	130	20,22/0.4	960	2	5.5
S11-M-63-	63	150	20,22/0.4	1145	1.9	5.5
S11-M-80-	80	180	20,22/0.4	1370	1.8	5.5
S11-M-100-	100	200	20,22/0.4	1650	1.6	5.5
S11-M-125-	125	240	20,22/0.4	1980	1.5	5.5
S11-M-160-	160	290	20,22/0.4	2420	1.4	5.5
S11-M-200-	200	330	20,22/0.4	2860	1.3	5.5
S11-M-250-	250	400	20,22/0.4	3350	1.2	5.5
S11-M-315-	315	480	20,22/0.4	4010	1.1	5.5
S11-M-400-	400	570	20,22/0.4	4730	1	5.5
S11-M-500	500	680	20,22/0.4	5660	1	5.5
S11-M-630	630	810	20,22/0.4	6820	0.9	6
S11-M-800	800	980	20,22/0.4	8250	1.8	6
S11-M-1000	1000	1150	20,22/0.4	11330	0.7	6
S11-M-1250	1250	1350	20,22/0.4	13200	0.7	6
S11-M-1600	1600	1630	20,22/0.4	15950	0.6	6

Dry type transformers, as the name suggests, do not use any liquid for cooling or insulation. Instead, they rely on air or gas to dissipate heat generated during operation. This makes them ideal for indoor applications where fire Safety is a concern, as they do not pose a risk of oil leakage or fire hazard. Dry type transformers are also more environmentally friendly, as they do not contain any hazardous substances such as PCBs.

On the other hand, oil immersed transformers use oil as a cooling and insulation medium. The oil helps to dissipate heat more efficiently, allowing the transformer to operate at higher power levels without overheating. Oil immersed transformers are typically used in outdoor applications or in locations where fire safety is not a major concern. However, they require regular maintenance to ensure the oil is clean and free of contaminants, which can be a costly and time-consuming process.

One of the key differences between dry type and oil immersed transformers is their construction. Dry type transformers have their windings and core enclosed in a sealed housing, while oil immersed transformers have their windings immersed in oil-filled tanks. This difference in construction affects the overall size and weight of the transformer, with oil immersed transformers typically being larger and heavier than dry type transformers.

In terms of efficiency, both types of transformers have similar performance characteristics. However, oil immersed transformers are generally more efficient at higher power levels due to their superior cooling capabilities. This makes them suitable for applications where high power levels are required, such as in industrial settings or power plants.

When it comes to maintenance, dry type transformers have the advantage of being maintenance-free, as they do not require regular oil testing or replacement. On the other hand, oil immersed transformers require regular oil testing and replacement to ensure optimal performance and longevity. This can be a significant cost factor for oil immersed transformers, especially in large installations where multiple transformers are used.

In China, there are many enterprises that specialize in the design and manufacture of both dry type and oil immersed transformers. These companies often hold certifications such as ISO 9001 and ISO 14001, which demonstrate their commitment to quality and environmental management. They also provide comprehensive technical support and after-sales service to ensure their customers get the most out of their transformers.

To learn more about the differences between dry type and oil immersed transformers, many Chinese transformer manufacturers offer informative videos on their websites. These videos provide a detailed overview of the construction, operation, and maintenance of both types of transformers, helping customers make informed decisions when choosing the right transformer for their specific needs.

In conclusion, both dry type and oil immersed transformers have their own unique advantages and disadvantages, making them suitable for different applications. Understanding the differences between these two types of transformers is essential for selecting the right transformer for your specific requirements. Whether you choose a dry type or oil immersed transformer, working with a reputable Chinese enterprise that specializes in transformer manufacturing can ensure you get a high-quality product that meets your needs.