Energy Efficient Transformers
Low Temperature Rise Energy Efficient transformers are designed with lower than normal conductor and total losses. Temperature rise is therefore lower resulting in greatly improved life expectancies and substantial increases in overload capabilities. 80°C and 115°C rise transformers can help cut operating expenses for systems requiring unit loading at 80 to 100%; of the nameplate rating, 24 hours a day, or where load growth is expected. A 115°C rise transformer can carry a continuous 15% overload, and the 80°C rise a 30%; overload, without exceeding the insulation rating or seriously reducing the life expectancy of the transformer. However, when operating in an overload condition, the internal temperature increases as a result of the higher conductor losses. Efficiency decreases under this condition. Since transformers operate beyond nameplate capacities usually during peak load periods, the benefits remain.
NEMA TP-1-1996, Energy Star Compliant
Energy Efficient Transformers are specifically designed to meet the energy efficiency standards set forth in NEMA Standards publication, TP-1-1996, "Guide for Determining Energy Efficiency for Distribution Transformers." Surveys have shown that the average loading of low voltage dry type distribution transformers, over a 24 hour period, is approximately 35%. TP-1 compliant transformers are optimized to offer maximum efficiency at 35% of name-plate rating. In applications where the average loading is in excess of 50%, MGM's low temperature rise (115°C or 80°C) product offers significant energy savings.
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