Electrical Single Line Diagram - Part Two

Posted on Feb 4, 2014

The single line diagram is circuit diagram where `one-line` is shown to represent three phases of a three phase power system. In addition to showing the ratings and size of electrical equipment and circuit conductors, a properly drawn one-line diagram will also show an electrically correct distribution of power with respect to current flow from th

Electrical Single Line Diagram - Part Two

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e power source to the downstream loads or panelboards. Inaccuracy in this documentation and failure to update one-line diagrams on a regular basis as electrical systems invariably grow over time often results in increased down time when system failures occur, The single line diagram offers several benefits to the facility it outlines, especially: identification of possible problem places, improved safety conformity, and enhanced staff safety. Single-line diagram is a simplified notation for representing a three-phase power system; Instead of representing each of three phases with a separate line or terminal, only one conductor is represented. On one-line power diagrams, components are usually arranged in order of decreasing voltage levels. The highest voltage component is shown at the top right of the drawing. In order to find out how power is supplied to a component, start at the component and trace the flow of power backwards through the drawing. This method will be most useful in locating the correct circuit breaker to isolate a component for maintenance The voltage, phase, and frequency of incoming and outgoing circuits. The available short circuit and ground currents of the power company system, and type of ground used. The abbreviations used for principal meters, instruments, and other devices (not including relaying, which is listed in Fig. 2) are listed in fig. 1 above. Each device in an automatic switching...

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