SCHEMATIC SYMBOLS FOR TRANSFORMERS

Figure 8-11 shows typical schematic symbols for transformers. View A shows the symbol for an air-core transformer. Views B and C show iron-core transformers. The bars between the windings indicate an iron core. Frequently, additional connections are made to the transformer windings at points other than the ends of the windings. These additional connections are called taps. When a tap is connected to the center of the winding, it is called center tap. View C shows the schematic representation of a center-tapped iron-core transformer.