Comparing Dry Type and Oil Immersed Transformers for Medium Voltage Applications

Transformers are essential components in electrical systems, as they help to step up or step Down voltage Levels to ensure efficient power distribution. When it comes to medium voltage applications, two common types of transformers are dry type and oil immersed transformers. Both have their own set of advantages and disadvantages, making it important for users to carefully consider their specific needs before making a decision.

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 a popular choice for indoor applications where fire Safety is a concern, as they do not pose the same risk of oil leaks or spills. Additionally, dry type transformers are generally more environmentally friendly, as they do not contain any hazardous substances.

model Rating capacity (KVA) Voltage combination(KV) No-load losses(W) Load losses(W) No-load current (%) Short-circuit voltage (%)
SCH15-30 30 6,6.3,6.6,10,11/0.4 70 710 1.6 4.0
SCH15-50 50 6,6.3,6.6,10,11/0.4 90 1000 1.4 4.0
SCH15-80 80 6,6.3,6.6,10,11/0.4 120 1380 1.3 4.0
SCH15-100 100 6,6.3,6.6,10,11/0.4 130 1570 1.2 4.0
SCH15-125 125 6,6.3,6.6,10,11/0.4 150 1850 1.1 4.0
SC(B)H15-160 160 6,6.3,6.6,10,11/0.4 170 2130 1.1 4.0
SC(B)H15-200 200 6,6.3,6.6,10,11/0.4 200 2530 1.0 4.0
SC(B)H15-250 250 6,6.3,6.6,10,11/0.4 230 2760 1.0 4.0
SC(B)H15-315 315 6,6.3,6.6,10,11/0.4 280 3470 0.9 4.0
SC(B)H15-400 400 6,6.3,6.6,10,11/0.4 310 3990 0.8 4.0
SC(B)H15-500 500 6,6.3,6.6,10,11/0.4 360 4880 0.8 4.0
SC(B)H15-630 630 6,6.3,6.6,10,11/0.4 420 5880 0.7 4.0
SC(B)H15-630 630 6,6.3,6.6,10,11/0.4 410 5960 0.7 6.0
SC(B)H15-800 800 6,6.3,6.6,10,11/0.4 480 6960 0.7 6.0
SC(B)H15-1000 1000 6,6.3,6.6,10,11/0.4 550 8130 0.6 6.0
SC(B)H15-1250 1250 6,6.3,6.6,10,11/0.4 650 9690 0.6 6.0
SC(B)H15-1600 1600 6,6.3,6.6,10,11/0.4 780 11730 0.6 6.0
SC(B)H15-2000 2000 6,6.3,6.6,10,11/0.4 1000 14450 0.5 6.0
SC(B)H15-2500 2500 6,6.3,6.6,10,11/0.4 1200 17170 0.5 6.0

On the other hand, oil immersed transformers use oil as a cooling and insulation medium. While this makes them less suitable for indoor applications due to the risk of oil leaks, they are often preferred for outdoor installations or in harsh environments where additional protection is needed. The oil helps to dissipate heat more effectively, allowing oil immersed transformers to handle higher loads and provide better performance in extreme conditions.

When it comes to performance, both types of transformers have their own strengths. Dry type transformers are known for their high efficiency and low maintenance requirements, making them a cost-effective option for many users. They are also more compact and lightweight compared to oil immersed transformers, making them easier to install and transport.
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On the other hand, oil immersed transformers are known for their durability and ability to handle overloads and short circuits. The oil provides better insulation and cooling properties, allowing them to operate at higher temperatures without compromising performance. This makes them a reliable choice for applications where reliability is a top priority.

In terms of cost, dry type transformers are generally more affordable upfront compared to oil immersed transformers. However, the total cost of ownership should also be taken into consideration, as oil immersed transformers may require less maintenance and have a longer lifespan, ultimately providing better value in the long run.

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When it comes to choosing between dry type and oil immersed transformers for medium voltage applications, it is important to carefully evaluate the specific requirements of the project. Factors such as installation location, environmental conditions, performance needs, and budget constraints should all be taken into account before making a decision.

Type Rated capacity (KVA) Voltage combination(KV) No-load losses(W) Load losses(W) No-load current (%) Short-circuit voltage (%)
SC13-30 30 6,6.3,6.6,10,11/0.4 150 710 2.3 4.0
SC13-50 50 6,6.3,6.6,10,11/0.4 215 1000 2.2 4.0
SC13-80 80 6,6.3,6.6,10,11/0.4 295 1380 1.7 4.0
SC13-100 100 6,6.3,6.6,10,11/0.4 320 1570 1.7 4.0
SC13-125 125 6,6.3,6.6,10,11/0.4 375 1850 1.5 4.0
SCB13-160 160 6,6.3,6.6,10,11/0.4 430 2130 1.5 4.0
SCB13-200 200 6,6.3,6.6,10,11/0.4 495 2530 1.3 4.0
SCB13-250 250 6,6.3,6.6,10,11/0.4 575 2760 1.3 4.0
SCB13-315 315 6,6.3,6.6,10,11/0.4 705 3470 1.1 4.0
SCB13-400 400 6,6.3,6.6,10,11/0.4 785 3990 1.1 4.0
SCB13-500 500 6,6.3,6.6,10,11/0.4 930 4880 1.1 4.0
SCB13-630 630 6,6.3,6.6,10,11/0.4 1070 5880 0.9 4.0
SCB13-630 630 6,6.3,6.6,10,11/0.4 1040 5960 0.9 6.0
SCB13-800 800 6,6.3,6.6,10,11/0.4 1210 6960 0.9 6.0
SCB13-1000 1000 6,6.3,6.6,10,11/0.4 1410 8130 0.9 6.0
SCB13-1250 1250 6,6.3,6.6,10,11/0.4 1670 9690 0.9 6.0
SCB13-1600 1600 6,6.3,6.6,10,11/0.4 1960 11700 0.9 6.0
SCB13-2000 2000 6,6.3,6.6,10,11/0.4 2440 14400 0.7 6.0
SCB13-2500 2500 6,6.3,6.6,10,11/0.4 2880 17100 0.7 6.0

In conclusion, both dry type and oil immersed transformers have their own set of advantages and disadvantages, making them suitable for different applications. By understanding the key differences between the two types of transformers and considering the specific needs of the project, users can make an informed decision that will ensure optimal performance and cost-effectiveness.