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Types of Transformers: Dry Type and Oil Immersed
Transformers are essential components in electrical systems, and their types can greatly affect efficiency and performance. Among the common types are dry type transformers and oil immersed transformers. Dry type transformers are designed to operate without any liquid insulation, making them ideal for indoor applications where fire safety is a concern. They are typically lighter, more compact, and require less maintenance than their oil-immersed counterparts.
On the other hand, oil immersed transformers utilize oil for cooling and insulation purposes. This type allows for higher power ratings and is often used in outdoor installations or large substations. The oil not only helps in dissipating heat but also provides superior insulation, making these transformers suitable for various industrial applications. Each type has its own advantages and disadvantages, which must be considered during selection.
The Significance of 3 Phase Transformers
Three-phase transformers play a crucial role in modern electrical systems by enabling efficient power distribution. They consist of three sets of windings that provide balanced voltage and current, making them highly effective for large-scale applications. These transformers are widely used in industrial settings, commercial buildings, and power generation stations due to their capacity to handle high loads.
In addition to their efficiency, three-phase transformers also help reduce the amount of copper and iron required in construction compared to single-phase transformers. This reduction leads to lower manufacturing costs and improved energy efficiency. In China, many enterprises specialize in the production of three-phase transformers, contributing significantly to the country’s electrical infrastructure.

Renowned Chinese Enterprises in Transformer Manufacturing
| Type | Rated capacity (KVA) | Voltage combination(KV) | No-load losses(W) | Load losses(W) | No-load current (%) | Short-circuit impedance (%) |
| 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 |
China is home to several well-known enterprises that specialize in transformer manufacturing, including dry type and oil immersed transformers. Companies like State Grid Corporation and China Southern Power Grid are recognized globally for their innovation and quality. These enterprises invest heavily in technology and research, ensuring that they remain competitive in the international market.
Many of these companies have produced educational videos that showcase their manufacturing processes, product features, and application scenarios. These videos serve as valuable resources for engineers and professionals in the electrical industry, helping them understand the advantages of different transformer types. By sharing their expertise through visual content, these companies enhance their reputation as specialists in the field.

