Why are Small Distribution Transformers not used for Industrial Control Application?
Industrial control equipment demands a momentary overload capacity of three to eight times normal capacity. This is customary in solenoid or magnetic contractor applications where inrush current can be three to eight times as high as normal sealed or holding currents but still maintain normal voltage at this momentary overloaded condition. Distribution transformers are designed for good regulation up to 100 percent loading, but their output voltage will drop rapidly on momentary overloads of this type making them unsuitable for high inrush applications. Industrial control transformers are designed especially for maintaining a high degree of regulation even at eight times normal load. This results in a larger and generally more expensive transformer. 13. Can Single Phase Transformers be used for Three Phase Applications? Yes, but the transformer output will be single-phase. Simply connect any two wires from a 3- or 4-wire source to the transformer’s two primary leads. Three single-phase
