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PEI (Peak Efficiency Index) Calculation
The Peak Efficiency Index (PEI) is used to evaluate the energy performance of power transformers under optimal loading conditions. The calculation is based on transformer losses and auxiliary power ...
NEMA Ratings and IP Protection Equivalency
NEMA Ratings and IP Protection Equivalency
The following table provides a comparison between NEMA enclosure ratings and their approximate IP (Ingress Protection) equivalents. NEMA ratings define en...
Insulation Resistance – Temperature Correction Factors (to 20 °C)
Insulation Resistance – Temperature Correction Factors (to 20 °C)
The following table provides temperature correction factors used to convert measured insulation resistance values of oil-immersed t...
Transformer Insulation (Thermal) Classes and Temperature Limits
Transformer Insulation Thermal Classes (IEC Reference)
The thermal class defines the maximum permissible temperature for the insulation system. It should not be confused with temperature rise, whic...
Ecodesign Losses for Um upto 24 kV and Rated Power upto 3150 kVA Oil Immersed Type
Ecodesign Loss Requirements (IEC Reference)
Requirements applicable to three-phase liquid-immersed medium power transformers with rated power ≤ 3150 kVA, with one winding Um ≤ 24 kV and the other w...
Peak Efficiency Index (PEI) Requirements
Peak Efficiency Index (PEI) Requirements
Requirements applicable to liquid-immersed medium power transformers with rated power greater than 3150 kVA, according to minimum Peak Efficiency Index (PEI...
Ecodesign Losses for Um upto 36 kV and Rated Power upto 3150 kVA Oil Immersed Type
Ecodesign Loss Requirements (IEC Reference)
Requirements applicable to three-phase liquid-immersed medium power transformers with rated power ≤ 3150 kVA, with one winding Um ≤ 36 kV and the other w...