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A typical one-line diagram with annotated power flows. Red boxes represent circuit breakers, grey lines represent three-phase bus and interconnecting conductors, the orange circle represents an electric generator, the green spiral is an inductor, and the three overlapping blue circles represent a double-wound transformer with a tertiary winding.
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A substation one-line diagram, showing: busbars (coloured grey), transmission lines (black) circuit breakers (red), a generator (orange) and a transformer (blue) with a tertiary-connected reactor (green). Active and reactive power flows are annotated in purple: Source: Own work: Author: BillC
Schematic diagrams showing the electrical interconnections between the components are made. They may not show all the conductors and termination points. Except for one-line diagrams, this should show all the circuit nodes. One-line diagrams represent the three or four conductors of three-phase power circuits with one line.
In power engineering, the power-flow study, or load-flow study, is a numerical analysis of the flow of electric power in an interconnected system. A power-flow study usually uses simplified notations such as a one-line diagram and per-unit system, and focuses on various aspects of AC power parameters, such as Voltage, voltage angles, real power and reactive power.
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Single-line may refer to: Inflatable single-line kite, one of the few modern inventions in the world of kite design; Single-line diagram, a simplified notation for representing a three-phase power system in power engineering; Single-line working, the practice of using one track out of two on a double track railway; Single-track railway
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