In power engineering, a one-line diagram or single-line diagram (SLD) is a simplified notation for representing a three-phase power system. … Electrical elements such as circuit breakers, transformers, capacitors, bus bars, and conductors are shown by standardized schematic symbols.
![](https://qntbd.com/wp-content/uploads/2019/09/single-line-diagrams-interpreting-150x150.png)