Is there a “rule of thumb” for utilities to use in determining transformer sizing of residential distribution loads?
Something based on monthly kWh usage, or house size, etc….something our lineman can use in the field. We have a large electric heat load, so that type of load must be factored in also. Answer: According to retired Electrical Distribution Engineer Dennis Greys, no “rule of thumb” would accurately provide this information. Many utilities do a series of correlation studies for the most loaded months in your case, winter. This is done every three or four years for different groups, i.e. residential, light commercial, etc. A simple regression analysis is studied and data collected for the energy and capacity. Utilities use this information to size transformers for residential loads. Your current transformer suppliers may also have information on this topic. You should definitely consider the use of high-efficiency transformers, which include both amorphous core and high-efficiency silicon-steel core transformers, both of which can play an important role in reducing energy losses. The EPA
