Blog Topic: Differences Between Dry Type and Liquid Immersed Transformers

Transformers are essential components in electrical systems, as they help to step up or step Down voltage Levels to ensure efficient power distribution. There are two main types of transformers commonly used in the industry: dry type transformers and liquid immersed transformers. In this article, we will explore the key differences between these two types of transformers and discuss their respective advantages and disadvantages.

Resin transformer 10 series\\u00a0	Rated\\u00a0capacity\\u00a0\\uff08KVA\\uff09	Voltage\\u00a0combination\\uff08KV\\uff09	Off-load\\u00a0losses\\uff08W\\uff09	Load\\u00a0losses\\uff08W\\uff09	Off-load\\u00a0current\\u00a0\\uff08%\\uff09	Short-circuit\\u00a0impedance\\u00a0\\uff08%\\uff09
SC10-30	30	6,6.3,6.6,10,11/0.4	190	710	2.4	4.0
SC10-50	50	6,6.3,6.6,10,11/0.4	270	1000	2.4	4.0
SC10-80	80	6,6.3,6.6,10,11/0.4	370	1380	1.8	4.0
SC10-100	100	6,6.3,6.6,10,11/0.4	400	1570	1.8	4.0
SC10-125	125	6,6.3,6.6,10,11/0.4	470	1850	1.6	4.0
SCB10-160	160	6,6.3,6.6,10,11/0.4	550	2130	1.6	4.0
SCB10-200	200	6,6.3,6.6,10,11/0.4	630	2530	1.4	4.0
SCB10-250	250	6,6.3,6.6,10,11/0.4	720	2760	1.4	4.0
SCB10-315	315	6,6.3,6.6,10,11/0.4	880	3470	1.2	4.0
SCB10-400	400	6,6.3,6.6,10,11/0.4	980	3990	1.2	4.0
SCB10-500	500	6,6.3,6.6,10,11/0.4	1160	4880	1.2	4.0
SCB10-630	630	6,6.3,6.6,10,11/0.4	1350	5880	1.0	4.0
SCB10-630	630	6,6.3,6.6,10,11/0.4	1300	5960	1.0	6.0
SCB10-800	800	6,6.3,6.6,10,11/0.4	1520	6960	1.0	6.0
SCB10-1000	1000	6,6.3,6.6,10,11/0.4	1770	8130	1.0	6.0
SCB10-1250	1250	6,6.3,6.6,10,11/0.4	2090	9690	1.0	6.0
SCB10-1600	1600	6,6.3,6.6,10,11/0.4	2450	11730	1.0	6.0
SCB10-2000	2000	6,6.3,6.6,10,11/0.4	3050	14450	0.8	6.0
SCB10-2500	2500	6,6.3,6.6,10,11/0.4	3600	17170	0.8	6.0

Dry type transformers, as the name suggests, do not use any liquid for cooling or insulation. Instead, they rely on air for cooling and solid insulation materials such as epoxy resin or cast resin. These transformers are typically used in indoor applications where fire Safety is a concern, as they do not pose the risk of oil leaks or spills. Dry type transformers are also more environmentally friendly, as they do not contain any hazardous liquids.

On the other hand, liquid immersed transformers use oil or other insulating liquids for cooling and insulation. These transformers are commonly used in outdoor applications or in areas where fire safety is not a major concern. The oil in liquid immersed transformers helps to dissipate heat more effectively, making them suitable for high-power applications. However, the use of oil in these transformers can pose environmental risks in the event of a leak or spill.

One of the key advantages of dry type transformers is their lower maintenance requirements. Since they do not use oil for cooling, there is no need for regular oil testing or replacement. Dry type transformers are also more compact and lightweight compared to liquid immersed transformers, making them easier to install and transport. However, dry type transformers are generally more expensive than liquid immersed transformers, which can be a limiting factor for some applications.

Liquid immersed transformers, on the other hand, are known for their high efficiency and reliability. The oil in these transformers helps to dissipate heat more effectively, allowing them to operate at higher power levels without overheating. Liquid immersed transformers are also more cost-effective than dry type transformers, making them a popular choice for high-power applications. However, the use of oil in these transformers can pose a risk of fire in the event of a fault or failure.

Type	Rating\\u00a0power\\u00a0\\uff08KVA\\uff09	Voltage\\u00a0combination\\uff08KV\\uff09	No-load\\u00a0losses\\uff08W\\uff09	Load\\u00a0losses\\uff08W\\uff09	No-load\\u00a0current\\u00a0(%)	Short-circuit\\u00a0impedance\\u00a0(%)
S11-630	630	33,35/6.3,6.6,10.5,11	830	7870	1.10	6.5
S11-800	800	33,35/6.3,6.6,10.5,11	980	9410	1.00	6.5
S11-1000	1000	33,35/6.3,6.6,10.5,11	1150	11540	1.00	6.5
S11-1250	1250	33,35/6.3,6.6,10.5,11	1410	13940	0.90	6.5
S11-1600	1600	33,35/6.3,6.6,10.5,11	1700	16670	0.80	6.5
S11-2000	2000	33,35/6.3,6.6,10.5,11	2180	18380	0.70	6.5
S11-2500	2500	33,35/6.3,6.6,10.5,11	2560	19670	0.60	6.5
S11-3150	3150	33,35/6.3,6.6,10.5,11	3040	23090	0.56	7.0
S11-4000	4000	33,35/6.3,6.6,10.5,11	3620	27360	0.56	7.0
S11-5000	5000	33,35/6.3,6.6,10.5,11	4320	31380	0.48	7.0
S11-6300	6300	33,35/6.3,6.6,10.5,11	5250	35060	0.48	7.5
S11-8000	8000	33,35/6.3,6.6,10.5,11	7200	38500	0.42	7.5
S11-10000	10000	33,35/6.3,6.6,10.5,11	8700	45300	0.42	7.5
S11-12500	12500	33,35/6.3,6.6,10.5,11	10080	53900	0.40	8.0
S11-16000	16000	33,35/6.3,6.6,10.5,11	12160	65800	0.40	8.0
S11-20000	20000	33,35/6.3,6.6,10.5,11	14400	79500	0.40	8.0
S11-25000	25000	33,35/6.3,6.6,10.5,11	17020	94100	0.32	8.0
S11-31500	31500	33,35/6.3,6.6,10.5,11	20220	112900	0.32	8.0

In terms of environmental impact, dry type transformers are considered to be more eco-friendly than liquid immersed transformers. Since they do not use oil, there is no risk of oil leaks or spills that can harm the Environment. Dry type transformers are also easier to recycle at the end of their service life, making them a more sustainable option in the long run.

In conclusion, both dry type and liquid immersed transformers have their own set of advantages and disadvantages. The choice between these two types of transformers will depend on the specific requirements of the application, including factors such as cost, efficiency, maintenance, and environmental impact. Ultimately, it is important to carefully consider these factors when selecting a transformer for your electrical system to ensure optimal performance and safety.