![]() EPRI published the methodology in February 2006 as a national model for siting transmission lines. The resulting EPRI-GTC Overhead Transmission Line Siting Methodology represents the most advanced, scientifically rigorous siting approach available today. We also involved more than 200 participants from government agencies, utilities, environmental groups and neighborhood organizations. We formed a team of national experts in global information systems, environmental compliance and other disciplines to head up the research. GTC assigned two project managers with environmental and routing expertise, Christy Johnson and Gayle Houston, to spearhead this three-year effort. The siting methodology we use today was developed through a $500,000 tailored collaboration project we co-funded with the Electric Power Research Institute (EPRI) and Photo Science, a Kentucky-based geospatial solutions company. The industry needed a better process for making routing decisions more consistent and defensible. These member systems serve some of the fastest growing communities in the nation.įrom our experience with highly organized opposition to new power lines, we concluded that there had to be a better way. GTC is an electric transmission cooperative owned by and serving 39 electric distribution cooperatives in Georgia. To keep pace with demand in a state where the population this decade is expected to grow by 19 percent and the energy demand is expected to grow by 39 percent, Georgia Transmission Corporation (GTC) builds about 70 miles of new transmission lines each year. Yet selection of transmission line routes is a growing source of public controversy and regulatory scrutiny throughout the world. To convert a transmission line to a background line, right-click on the line and select "Convert to background line." from the local menu.There is a shortage of high-voltage transmission lines in the United States, and demand is expected to grow at least 20 percent in the next decade. To add a vertex, hold down the CTRL key and then click on the line where you would like to add a vertex. To remove a vertex, hold down the CTRL key and then click the vertex you would like to delete. ![]() You can then move any vertex clicking and holding the left mouse button down on the vertex, dragging it to a new location, and then releasing the mouse button. This causes handles to appear at each vertex. To change the shape of the line, first left-click on the line to select it. line color, line thickness, etc.), make use of the tools in the Formatting ribbon group. To change the physical appearance of the line (i.e. This brings up the Branch Options dialog, which you can use to change various line parameters. To modify the parameters for an existing line, position the cursor anywhere on the line and right-click. ![]() If you do not want to add the line to the case, select Cancel. Enter the per unit (100 MVA base by default) resistance, reactance, total charging susceptance (that is B not B/2) for the line, and an MVA rating. Enter the thickness of the lines used to display the transmission line. If there is just one line between the buses, the circuit number should be "1." For multiple lines between buses, you must give each a unique circuit number. The from and to bus numbers are set automatically provided the line starts and ends on existing buses. To complete adding a new line, place the cursor on the second bus for the line (the to bus) and double-click with the left mouse button. Add more segments to the line by moving the cursor and clicking with the left mouse button. Then place the cursor on the first bus for the transmission line (the from bus) and click the left mouse button. To add a new transmission line to the case, first select Network > Transmission Line from the Individual Insert ribbon group on the Draw ribbon tab. Right-clicking on a transmission line displays the line's local menu, from which you can choose to inspect the Branch Information Dialog. You can customize the line flow animation using the Animated Flows Options on the Oneline Display Options Dialog. Simulator's animation feature can be used to indicate the magnitude of the flow on the transmission line, either in MW or in terms of the line's percentage loading. The appearance of transmission lines, including line thickness and color, may also be customized. You can also add pie charts and line fields to transmission lines to indicate how heavily loaded the line is. Transmission lines may be equipped with circuit breakers that can be used to change the line's status. ![]() Transmission lines are represented on the onelines using multiple segment lines drawn between buses.
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