ABSTRACT
In general, distribution transformers are used to reduce primary system voltages (2.4-34.5 kV) to utilization voltages (120-600 V). Table 3.1 gives standard transformer capacity and voltage ratings according to ANSI Standard C57.12.20-1964 for single-phase distribution transformers. Other voltages are also available, for example, 2400 × 7200, which is used on a 2400 V system that is to be changed later to 7200 V.
