![]() Using PowerWorld Simulator, run a base case power flow. Show on a copy of the single-line diagram per-unit line impedances, transformer impedances, generator outputs, and loads that you se- lected above. Then determine per-unit transmission-line impedances for the lines shown on the single-line diagram (show your calculations).Īlso select appropriate transformer voltage and MVA ratings, and determine per-unit transformer leakage impedances for the trans- formers shown on the single-line diagram.ĭevelop a generation schedule for the 5 generator buses. Taking into consideration the load you allocated above, select appropriate transmission-line voltage ratings, MVA ratings, and distances necessary to supply these loads. Total load of the four systems is 400 MW.Īllocate the total 400-MW system load among the four systems.įor each system, allocate the load to buses that you want to repre- sent as load buses. Generation is present at buses 1, 16, 17, 22, and 23. There are 31 buses, 21 lines, and 13 transformers. Upgrade 69-kV substation to 138/69 kV $200,000ĭesign Project 3: Single-line diagram for 31-bus interconnected power systemįigure 6.22 shows a single-line diagram of four interconnected power systems identified by di¤erent graphic bus designations. Transformers (138 kV/69 kV) Transformer costs include associated cir- cuit breakers, relaying and installation.Īssume any new 138/69 kV transformer has 0.0025 per unit resistance and 0.04 per unit reactance on a 100-MVA base. To find your specific value consult the table at the end of this design project. For these design problems assume a symmetric tower configurations with the spacing between the conductors student specific. The conductor characteristics are given in Table A.4 of the book. ![]() Lined impedance data and MVA ratings are determined based on the conductor type and tower configuration. The assumed cost in $/mile are given here. The variable costs depend on the type of conductor and the length of the line. The fixed costs are $200,000 for a 138-kV line and $125,000 for a 69-kV line. The fixed cost is for the design work, the purchase/ installation of the three-phase circuit breakers, associated relays, and changes to the substation bus structure. Transmission lines (69 kV and 138 kV) New transmission lines include a fixed cost and a variable cost. LYNN to WOLEN SANDER to SCOTT SLACK to WOLEN JO to SCOTĭESIGN PROJECTS 1 AND 2: SAMPLE TRANSMISSION SYSTEM DESIGN COSTS ![]() Right-of-Way/Substation BOB to SCOT BOB to WOLEN FERNA to RAY LYNN to SCOT ![]()
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