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What are Air Insulated Transformers?
Air insulated transformers (AITs) are power transformers that use air, rather than oil or other insulating fluids, as the primary insulation medium. Their construction is designed to withstand electrical stress using solid insulation (like resin or cast epoxy) and air gaps. Unlike oil-immersed transformers, which rely on liquid dielectrics for cooling and insulation, AITs operate without flammable or potentially polluting fluids.
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These transformers are commonly found in indoor applications, compact substations, and industrial environments where safety, reliability, and environmental considerations are critical.
Environmental Advantages of Air Insulated Transformers
1. No Risk of Oil Spillage
One of the biggest ecological concerns with oil-insulated transformers is the risk of leaks or spills that can contaminate soil and water sources. AITs eliminate this risk entirely. By avoiding oil or other liquids, they reduce the chances of ground contamination and the need for costly containment and remediation systems.
2. Fire Safety and Reduced Hazardous Emissions
Oil-insulated transformers pose fire hazards due to the flammability of mineral oil. In contrast, AITs are inherently safer since they do not use combustible fluids. In case of internal failure or external fire exposure, they release fewer toxic fumes, making them more suitable for densely populated or environmentally sensitive areas.
3. Lower Carbon Footprint in Maintenance
AITs typically require less routine maintenance, especially regarding fluid testing and handling. This translates to lower emissions associated with equipment servicing, transportation, and oil disposal processes. Their long maintenance intervals also make them cost-effective in the long term.
4. Recyclability and Material Efficiency
Modern air insulated transformers are often made from recyclable materials such as cast resin, aluminum, and copper. Their design allows for easier disassembly at the end of life, contributing to a circular economy and minimizing environmental waste.
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