- Parent Category: Coordination
- Category: 8-Bus Systems
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# 8-Bus System (System I)

** I. Introduction:**

\(\bullet\) The network of this test case is shown in the figure given below, where the near-end \(3\phi\) fault is considered. Bus 4 is connected to an external grid that is modeled by 400 MVA short-circuit capacity.

\(\bullet\) Some studies named this system as a 6-bus test system, because bus 7 and bus 8 are connected to the generating units and do not have any relay.

\(\bullet\) The available set of the discretized plug-setting (\(PS\)) is \(\{0.5,0.6,0.8,1.0,1.5,2,2.5\}\). Although this test case has small dimension, it has been noticed that it is very hard to get feasibly and optimal solution; *please refer to our study given in the references section*.

\(\bullet\) The CT ratios (\(CTRs\)) and the \(3\phi\) short-circuit current for each P/B pair of relays are given below (*click on them for bigger size*):

** II. Single-Line Diagram:**

\(\bullet\) This single-line diagram was drawn by Ali R. Alroomi in Sept. 2013 and all the necessary data were coded in MATLAB m-files.

** III. Files:**

\(\bullet\) System DATA (MATLAB, m-file Format) [Download]

\(\bullet\) Results Tester (MATLAB, m-file Format) [Download]

** IV. References (Some selected papers that use this system):**

[1] A.S. Braga, and J.T. Saraiva, "Coordination of Overcurrent Directional Relays in Meshed Networks Using the Simplex Method," in *Electrotechnical Conference, 1996. MELECON '96., 8th Mediterranean*, vol. 3, pp. 1535-1538, May 1996.

[2] H.H. Zeineldin, E.F. El-Saadany, and M.A. Salama, "Optimal Coordination of Directional Overcurrent Relay Coordination," in *2005 IEEE Power Engineering Society General Meeting*, vol. 2, pp. 1101-1106, Jun. 2005.

[3] H.H. Zeineldin, E.F. El-Saadany, and M.A. Salama, "Optimal Coordination of Overcurrent Relays Using a Modified Particle Swarm Optimization," *Electric Power Systems Research*, vol. 76, no. 11, pp. 988-995, 2006.

[4] H.H. Zeineldin, "Optimal Coordination of Microprocessor Based Directional Overcurrent Relays," in *2008 Canadian Conference on Electrical and Computer Engineering (CCECE 2008)*, pp. 289-294, May 2008.

[5] A. Noghabi, J. Sadeh, and H. Mashhadi, "Considering Different Network Topologies in Optimal Overcurrent Relay Coordination Using a Hybrid GA," *IEEE Transactions on Power Delivery*, vol. 24, no. 4, pp. 1857-1863, Oct. 2009.

[6] T. Amraee, "Coordination of Directional Overcurrent Relays Using Seeker Algorithm," * IEEE Transactions on Power Delivery*, vol. 27, no. 3, pp. 1415–1422, Jul. 2012.

[7] F. A. Albasri, A. R. Alroomi, and J. H. Talaq, "Optimal Coordination of Directional Overcurrent Relays Using Biogeography-Based Optimization Algorithms," *IEEE Transactions on Power Delivery*, vol. 30, no. 4, pp. 903–911, 2015.

[8] V.A. Papaspiliotopoulos, G.N. Korres, and N.G. Maratos, "A Novel Quadratically Constrained Quadratic Programming Method for Optimal Coordination of Directional Overcurrent Relays ," *To be published in IEEE Transactions on Power Delivery*, 2015.