# Essay on Computer Aided Power System Design and Analysis

2427 Words10 Pages
1. Introductions In this assignment, a software package named ‘ERACS’ is used for diagram building of a power system, Load flow analysis, Balanced and Unbalanced Short Circuit analysis. Calculate the short circuit level (in MVA) in balanced, the current fed into the fault and the voltages of the healthy at bus 4 of the unbalanced circuit. Analyze and compare these two results which got by theory and analytical procedures with the system performance. 2. Procedures and Comments I. Using ERACS software package to construct the network shown below. Figure 1.1 example network The network diagram constructed by ERACS: Figure 1.2 constructed network Setting notice: The system positive, negative and zero sequence…show more content…
fault power = Vp.u. ×If (p.u.) = 4.6739pu ∴ Fault power at Bus 4 = 4.673pu × MVAbase=467.39MVA Give a table 2.2 for Results of Busbars by software： | Voltage(pu) | Voltage(kv) | Voltage angle ( o ) | Three Phase Fault level (MVA) | Busbar1 | 1.0 pu | 11.0 kv | 0 o | 515.95 MVA | Busbar2 | 0.917 pu | 120.99 kv | -4.694 o | 429.95 MVA | Busbar3 | 0.923 pu | 121.83 kv | -2.661 o | 410.13 MVA | Busbar4 | 0.931 pu | 122.83 kv | -0.66 o | 491.96 MVA | Busbar5 | 0.97 pu | 10.674 kv | 2.515 o | 644.72 MVA | Table 2.2 results of Busbars Compare the fault power get by