Single Line Diagram Power Distribution System

Central station where power is generated by 3 phase alternators.

Single line diagram power distribution system. In power engineering a single line diagram sld also sometimes called one line diagram is a simplified notation for representing a three phase power system. Between the generating stations and the distribution stations three different levels of voltage transmission sub transmission and distribution level of voltage are used. Single line diagram is the representation of a power system using the simple symbol for each component. 15 percent based on 25 000 kva and 13 8 kv.

In figure 1 c s. Three phases are denoted by a single conductor i e power system is assumed in a balanced steady state. A single line diagram is method of simplified representation of a three phase power system. The selected base s value remains constant throughout the system but the base voltage is 13 8 kv at the generator and at the motors and 72 136 kv on the transmission line.

The single line diagram of a power system is the network which shows the main connections and arrangement of the system components along with their data such as output rating voltage resistance and reactance etc. A one line diagram or single line diagram is a simplified notation for representing a three. What is a single line diagram. No calculation is necessary for correcting the value of the generator reactance because it is given as 0 15 p u.

Impedance and reactance diagrams. Represents the central station where power is generated by 3 phase alternators at 6 6kv or 11kv or 13 2kv or even 32 kv. In order to analyze a power system under load conditions or upon the occurrence of a fault it is essential to draw the per phase. Figure 1 single line diagram of transmission and distribution network.

Calculate the generator reactance. The one line diagram has its largest application in power flow studies electrical elements such as circuit breakers transformers capacitors bus bars and conductors are shown by standardized schematic symbols.