![]() More details for site consideration are discussed in NFPA 70: National Electrical Code Articles 450.8, 450.21 and 450.22. In such case, transformer kilovolt-ampere should be de-rated by 8% for each 10☌ above 40☌ (when air-cooled for dry-type transformer) and also by 0.3% for every 330 feet over 3,300 feet altitude). If any of these conditions are not met, transformer should be de-rated. In general, the kilovolt-ampere ratings are based on temperature not to exceed 40☌ ambient temperature (or ambient temperature of 30☌ averaged over a 24-hour period, otherwise some decrease in life expectancy will occur) and also installed below 3,300 feet at sea level. Several details, including transformer type, size, ventilation, atmospheric pressure, altitude, voltage level and clearance will have a determining factor in selecting the ideal location for the transformer required for a given installation.Īn engineer must be aware of the limitations due to the selected location of a transformer. Transformer site locationĬareful consideration must be taken when selecting the proper location for a transformer. The overall approach for sizing transformers and related system impact are similar for all types of transformer with different cooling classes. ![]()
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