![]() It is a grounded metal enclosure containing factory-mounted, bare or insulated conductors, usually copper or aluminium bars, rods or tubes.Ĭircuit breaker: A circuit breaker is a circuit component that can open or close a circuit under normal and fault conditions. Each section can be disconnected with the help of an isolator for maintenance.īusbar: A busbar is an assembly of bus conductors with associated connection joints and insulating supports. For example, if the entire substation is divided into five sections. This is accomplished by an isolating switch or an isolator. An isolator is essentially a switch designed to open a circuit under no load. Isolating switch: In power substations, it is required to disconnect a part of the system for general maintenance and repairs. Important symbols for a Single Line Diagram: – It ensures a safer and more reliable operation of the system. – It further ensures the safety of personnel and makes maintenance more convenient. – It simplifies the troubleshooting process and makes it faster. – Gives an overall understanding of the system and eases evaluation. It helps in a detailed study and evaluation of the system and its efficiency. A single line diagram makes it easy to understand an electrical system, particularly in the case of complicated systems in substations. In a single line diagram, instead of representing each of three phases with separate lines, only a single conductor is represented using a single line. The electrical elements such as circuit breakers, transformers, bus bars, and conductors, are represented using standardized schematic symbols so that they can be read and understood easily. It has a diagrammatic representation of all the equipment and connections. A single line diagram also called the one-line diagram is a symbolic or graphical representation of a three-phase power system.
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