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Dry type transformers are electrical devices that are designed to transform voltage from one level to another without the use of liquid coolant, unlike oil-filled transformers. They are widely used in various applications due to their inherent safety, low maintenance requirements, and environmental friendliness. Here are some key features of dry type transformers:

1. Safety: One of the primary advantages of dry type transformers is their enhanced safety. 

2. Low Maintenance: Without the need for oil checks, refills, or cooling system maintenance, dry type transformers require less maintenance compared to their oil-filled counterparts. This translates into lower operating costs over time.
   

3. Space Efficiency: Dry type transformers can be more compact, and can be installed close to the load, reducing the need for long cable runs.
   

4. Noise Reduction: Modern designs of dry type transformers often incorporate noise-reducing features, which make them suitable for noise-sensitive environments like offices or residential areas.
   

5. Corrosion Resistance: The absence of oil and the use of materials resistant to corrosion in their construction make dry type transformers suitable for coastal or corrosive environments.
   

6. Temperature Sensitivity: While they can operate at higher temperatures, dry type transformers may require more attention to ventilation and cooling to prevent overheating, especially in high-load or confined spaces.

Qinghao dry-type transformer models include SCB9, SCB10, SCB11, SCB13 series according to their performance. The voltage includes 6.6kv, 10kv, 11kv, 13.8kv, 15kv, 22kv, 33kv, 35kv, etc., and capacity from 30kva to 5000kva. Qinghao dry type transformers offer a safe, clean, and efficient solution for voltage transformation needs across various industries and applications.