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Transformers are fundamental for electricity distribution, stepping the voltage up and down as it travels from power plants to individual buildings.
Transformers are among the most efficient electrical devices, with a typical efficiency rating above 97%.
However, consider that transformers are always operational, even when the load connected to them is small.
Even greater savings are possible if you measure the total harmonic distortion (THD) of your electrical system, and add the corresponding filters.
Transformers become less efficient when their loads have a high harmonic content.DOE 2016 Efficiency Levels for LVDT TransformersLVDT transformers are very common in facilities that handle different voltage levels, such as 480/277 V and 220/127 V. With the DOE 2016 standard, the minimum efficiency for three-phase models was increased.
However, significant savings are possible when upgrading three-phase transformers, especially in buildings with many of them.Efficiency Requirements for Three-Phase, Dry-Type, Low-Voltage TransformersCapacity (kVA)TP-1 Efficiency (Previous)DOE 2016 Efficiency15304575112.5150225300500750100097.0%97.5%97.7%98.0%98.2%98.3%98.5%98.6%98.7%98.8%98.9%97.89%98.23%98.40%98.60%98.74%98.83%98.94%99.02%99.14%99.23%99.28%If you have single-phase transformers that meet the previous standard (TP-1), upgrading to DOE 2016 efficiency units will save little or no energy.
