Question-5 T5 Paints Two time-overcament relays protect adjacent sections of a radial system. Has 3 in at the end of the radial line. Appimately 7000 amps of fault current will flow for a coes-in fault at point A and approximately 5000 amps of fault curt will flow fo line-end fault at point II. Load current at bus 2 is 100A and load current at 3504 Hoth load carts at unity power fastor. Modell this situation using ASPEN Che Liner dware and simulate the aforementioned faults Observe the relay curves and the triptis. Investigate the phase and sequence voltage and currents for ach bus and lize after slmosting both faulte, (23) I • In the file menu, choose New to start a new project. Choose 100 MVA as the • Eight-click in the workspace and choose Now Blue. The Hus Info pop-up men should appear. Fill in the Name as Has 1, the lus a as 1, the No. KV 41.6. The buses can be moved by dragging them around the workspace. Do this again 2 and 3. Click on 1, hold down the shift key, and right-click on las 2. Choose New Line. The Transion Line Data mou should appear. Fill in the following Name = Line |_ Longth = 10 mi Laame srverythling olee the same. Repeat this for the line between buses 2 and 3, which will be called line 2. However, X-0.0774. Everything should be the same as line 1. • Eight-click on line 1 near This 1 and choose New Holay Group. On the mens that appears, click on the Add OC Phase Relay button. Fill the space 11-Relay ||GT ratio = 12 Timedial Tap unit Pickup-4 Dure=1002 Fer Make the dictional option is NOT selected. Click OK, then Ins. Do the same for line 2 near las 2, exopt for the following. ||II-Relay 2 CT ratio=0 Time del=0.8 Tap unit Pickup = 5 Curve Ch Make sure the directional option is NOT selected. Eight-click on us 1. Choose now, then getor. The parameter for the generator will automatically appear. Use E-0 and X-0.1 for each impedanc including neutral impedance. The unit rating should be 100 MVA and the scheduled gestion should be 100 MW. Leave the most the same. Click OK for the • Right click on us 2. Choose New, then Load. The parameter load will automatically appear. Kate MW for constant power, 7.2 MW for constant current, and 0 MW far constant Impedance. Hopeat for H3, cept use 25.22 MW of constant current • Eight-click on olay 2 and choose Specity Faulk. Choose Close-in-Vault, no outage Choose the phone connections. Doselect all other phase selections, since here we are only intested in a balanced 3-phase fault. Click Simulat . On the to, click on the clock icon to see the olay operating time and the fault current • Repeat this for a line end fault with no outage. Make sure to do-select close-is- . By holding down the control key and double-clicking on a line or bus, a graphical rotation of the voltages and currents can be see To sea text file of simation sults, click on the TTY icon on the toolbar. After ting fault, right-click on the relay near Blus 1. Chaos View Holay Curves and alak Di & gph of the tliese cooooumeut curve four relay 1 should appear. On the curve graph, click on the Add me and select Hlay Cri Vivinity. • Select Relay 2 from the window that appears and hit OK. The curat curve for both relays should now be on the same graph. To see when the relays tripped, go into the Show me and select Relay Operations for All Faults • Solution should consist of the relay coordination curves, a text file of simulation results, graphical representation of voltages and events, screenshot depicting the relay operations and screenshot of the

Fig: 1