This project represents the performance and simulation analysis of a 33/11 kV substation using ETAP (Electrical Transient Analyzer program) software. The primary purpose of the project is to calculate the transient behavior and load flow analysis of the electrical substation to ensure the electrical safety, system efficiency, system reliability and flexibility.

The study start with the proper modeling of SLD (Single Line Diagram) of a 33/11 kV substation. It includes various types of components Grid, Step down Transformer, Cable, Circuit Breaker, Bus Bars, Contactor and also various types Loads. The load flow analysis is performs by using the Newton- Raphson method. It shows the power flow in the bus bar that is (Real Power kW+ Reactive power kVAR), losses on buses and voltage graph at lagging and leading condition. This analysis helps to identify the loading on various buses, over-voltage and under voltage at peak load.

Short-Circuit fault consists line to line, line to ground, and three phase short circuit. The short-circuit analysis helps to calculate the minimum and maximum short circuit current and fault current.

The results of ETAP software shows the power factor correction and how much power delivered to the load and also it shows the voltage profile  graph at leading or lagging. The main factor is losses in system or substation (I²R).

Furthermore, the electrical software of simulation tools such as ETAP and EPLAN slightly improves system performance and planning of electrical substation. by performing load flow analysis and short-circuit analysis before actual construction of substation, this analysis helps identify potential operation issues and also this predications reduces losses, increases system efficiency and increase overall reliability. Therefore, pre-planning minimize the risk of equipment failure and other faults.

Keywords:- 33/11 substation, ETAP, step down transformer, circuit breaker, leading and lagging power factor.