Medium and long lines are represented by nominal PI circuits, whereas very long lines are represented by equivalent PI circuits. A short line is represented by its series impedance. Transformers and motors are represented by their equivalent circuits. Representation of Power System Components on the Single Line DiagramĪ generator is represented by an emf in series with an impedance. The equivalent circuit of the system drawn by combining the equivalent circuits for the various components shown in the one-line diagram is known as the impedance diagram of the system. ![]() In order to analyze a power system under load conditions or upon the occurrence of a fault, it is essential to draw the per-phase equivalent circuit of the system by using its one-line diagram. ![]() Three phases are denoted by a single conductor i.e., power system is assumed in a balanced steady state. ![]() ![]() Concept of a Bus in Single Line DiagramĪ single line diagram is method of simplified representation of a three phase power system.Representation of Power System Components on the Single Line Diagram.
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