The former is a general system layout that does not usually provide much detailed information, while the latter is more descriptive in terms of system capacity, control, protection, etc.
Broadly, there are two types of the single-line diagram: the system single-line diagram and the equipment single-line diagram.
CT & PT).Ī complete single-line diagram along with the physical installment layout should be sufficient to properly plan and assess power systems. Thus, in this article, the focus is to present some tips aid analyzing MV switchgear single-line diagram and wiring diagram of measurement and protection circuits (i.e. Moreover, the CT and PT tracing and troubleshooting can be burdensome, especially for those who do not master drawing reading skills. Substation system complexity level differs according to several factors, such as busbar arrangement, protection functions, CT/PT configurations, number of incomer/feeder circuits, and otherwise. A single line diagram is a simplified explanation for representing a three-phase power system. It is a simplified drawing of the whole system or a portion of the power system that shows the electrical placement of all major equipment. The detail level of these drawings falls in a spectrum in which the single-line drawing is at one end holding the least detailed and most simplified drawing type while the wiring drawing is located at the opposite end that is the most detailed and complicated type. An electrical single line diagram abbreviated as SLD is also referred to as a one-line diagram. Typically, the drawing types include a single-line diagram, AC schematics, DC schematics, logic diagram, panel layout diagram, wiring diagram, and other different types. Basically, the schematic is intended to facilitate following the measuring and protection circuits without considering the actual location, physical size, and shape of the depicted electrical system components. Drawing types vary in the level of details they communicate the required information.
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