9.1 THREE-PHASE SYSTEM VERSUS SINGLE-PHASE SYSTEM
Industrial heaters are used for a variety of heating applications in various material processing industries. Typically, heater boxes that contain heating elements powered by AC supply transfer the heat developed to a gaseous (usually air) or liquid medium which conducts the heat to the material that is to be heated up. Resistor elements made of some specially constructed wire are laid out uniformly inside the heater box to develop uniform heating of the contact surface. Many such heating elements are finally connected in parallel to form the heater resistive load. Consider such a heater, which after all the parallel connection of sub-elements, is finally represented by three equal resistors of ...
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