Can three phase dry type transformer be installed in the open air?

1. Core Installation Requirements

• Prohibition of Open-Air Installation: Open-air installation is extremely dangerous; the transformer must be placed in a dry environment to avoid moisture damage.
• Protection Level: Must be equipped with a distribution box with IP54 or higher protection rating to prevent water ingress and ensure the transformer stays dry.
• Heat Dissipation Consideration: The distribution box must be designed for efficient heat dissipation. Even in high ambient temperatures, the internal temperature must not exceed the transformer’s allowable operating temperature.
• Altitude Factor: Installation must account for altitude variations, as high altitude may affect insulation performance and cooling efficiency.

2. Main Application Scenarios

• Local lighting systems
• High-rise buildings
• Airports and terminals
• CNC machinery and equipment

3. Core Characteristics

• Definition: A transformer whose iron core and windings are not immersed in insulating oil—eliminating oil-related fire, explosion, or pollution risks.
• Cooling Methods:
  1. Natural Air Cooling (AN): Supports long-term continuous operation at rated capacity.
  2. Forced Air Cooling (AF): Increases output capacity by 50% compared to natural cooling.
• Overload Operation Rules:
  • Suitable for intermittent overload or emergency accident overload.
  • Long-term continuous overload is not allowed—overload causes a sharp increase in load loss and impedance voltage, leading to uneconomical operation and accelerated insulation aging.

4. Product Classification

• Open type
• Closed type
• Cast (pouring) type