![]() Electrical elements such as circuit breakers, transformers, capacitors, bus bars, and conductors are shown by standardized schematic symbols. The one-line diagram has its largest application in power flow studies. 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. This information, although useful in certain applications.Simplest symbolic representation of an electric power system A typical one-line diagram with annotated power flows. This provides an overview of the main electrical system. Major loads and controls are also identified. The one-line diagram identifies the main feeder and branch circuits which will be explained later on in this chapter. Example line diagram of the ship’s distribution systemįor example, a one-line diagram of the ship’s distribution system describes the power supply and its distribution to individual loads it is also known as a basic diagram. The size of this point is restricted only by open-circuit devices, such as open contacts and open switches, or the existence of a power-consuming component, such as a motor, resistor, light bulb, or solenoid. Thus a node is an electrically conductive point in the diagram that does not consume power. In other words, the sum of the currents entering a node must equal the sum of the currents leaving a node: I in = 1 outĪs purposeless as it may sound at first, Kirchhoff’s description of the node holds a very important meaning to the understanding of the sequence of events in the electrical system. Kirchhofif’s Current Law states that the algebraic sum of the currents entering and leaving a node is zero. Keep in mind that the difference in potential is available to many other circuits within this system through the same nodes.Īny time a positive node and a negative node have their different potentials joined through a load, the load can become energized, and that device should function. The schematic symbol represents the node as a solid dot indicating a connection of two or more wires. ![]() The node is an exceptionally important concept. The interpretation of the line diagram starts with the concept of a node. The line diagram needs to be consulted anytime a load is not energizing.īy identifying the component that is not functioning, you can then determine the control devices, switches, and protective devices that might have prevented a completed circuit to the component. The simple design of the line diagram is a graphic representation of operation, not the physical placement or the actual electrical connections. Any loads in series must equal the applied voltage available in each branch of the line diagram ( ETbranc = Ebranch1 + E Ebranch2 ) Simple Design of Ship Line Diagram In parallel-connected circuits, the voltage is constant across each branch circuit. Most loads have the same voltage requirement as the other electrical loads in the same circuit. If the manufacturer has not done this, it is advantageous to do this yourself. Many manufacturers number their diagrams so as to aid the engineer in troubleshooting. The line diagram can be made easier to follow when the horizontal lines are numbered. When it becomes necessary to understand the entire sequence of events in the operation of a particular component, foiling to interpret any of the controlling devices will circumvent any well-intended investigation.
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