EasyPower^® Tutorial - Creating a One-line

This tutorial describes the basic steps to create a one-line. For more detailed instructions, refer to "Making One-Line Diagrams" and "Your First EasyPower One-line" in Help.

After you start EasyPower, the session window opens. Click the window's Maximize button on the upper-right to make the window fill the screen. To make the one-line window fill the EasyPower session, click its maximize button also.

Figure 1: EasyPower Session

Adding Buses to the One-line

EasyPower performs calculations using the concept of “bus." A bus can represent not only a bus bar, but also a connection point (or terminal of a piece of equipment). You can also think of buses as nodes. The central equipment type of every one-line is the bus. A bus defines the connection point for all types of equipment. Each piece of equipment must be connected to a bus when creating the one-line.

• Click Bus in the Equipment Palette—the pointer changes into a bus symbol. Place three buses as shown in the figure below by clicking the mouse. Don't worry about the utility yet—we'll add it in a moment.

Note: Depending on your settings, you may need to click Select in the Equipment Palette or press ESC on the keyboard between adding each bus—the pointer changes into a select pointer , indicating that you are no longer adding items.

• Click MCC and place a motor control center on the one-line as shown below.
• Click Panel and place a panel on the one-line as shown below.

Figure 2: Adding Buses, MCCs, and Panels

Adjusting Bus Sizes and Locations

You can now move and re-size your buses. To move your buses and ID names, drag them with the mouse while the select pointer is active. To lengthen or shorten your buses, drag either end of each bus with the mouse.

Figure 3: Adjusting Bus Sizes

Entering Bus kV Data

Enter bus data by double-clicking on each of the bus symbols with the select pointer . The Bus Data dialog box is displayed each time and you can enter the kV for the bus. Use 13.8 kV for the top bus and 0.48 kV for the others. You may also change the ID names.

Tip: You can set a default kV for new buses by selecting Tools > Equipment > Bus from the ribbon.

Copy and Paste

You can also copy and paste bus data. To do this:

1. Select a bus with the pointer . The bus turns green to indicate it is selected.
2. Click Copy.
3. Select a different bus (or group of buses). You can drag a selection box around a group of buses to select multiple buses.
4. Click Paste.

Adding a Transformer

1. Click Two Winding Transformer on the Equipment Palette—the pointer turns into a two winding transformer symbol.
2. Place the transformer by positioning the transformer pointer's top leader on the top bus and clicking. The transformer automatically attaches to the bus, and the top half of the symbol turns black. If you miss (the transformer doesn't connect and remains red), switch back to the select pointer if needed and drag the symbol into position.

   
   

   Figure 4: Adding a Transformer

3. With the select pointer active, use the left mouse key to drag the transformer's remaining leader to the middle bus (see figure above). After it connects, drag the transformer symbol up so it is centered between the two buses.
4. Double-click on the transformer to enter the transformer data. Important entries are noted with a red exclamation mark. You can still save the data without those entries being made, but will not be able to perform analysis until the entries are complete.

Adding Cables

1. Click Cable on the Equipment Palette—the pointer changes into a crosshair. Put the crosshair on the middle bus and click the left mouse button (but don't release it yet). This sets one end of the line. Now drag the crosshair to the left bottom bus (as shown in the figure below) and release the mouse button. This places the cable.

   
   

   Figure 5: Adding Cables

2. Repeat this for the other cables. Note that you can move the cables by dragging them with the select pointer.
3. Double-click on the cables to enter cable data.

Adding Motors

1. Click Motor on the Equipment Palette—the pointer changes into a motor symbol.
2. Place the first motor by positioning the motor pointer's leader on the bottom left bus and clicking. The motor automatically attaches to the bus, and the symbol turns black. If you miss (the motor doesn't connect and turns red), drag the symbol into position after pressing the button.
3. Continue by attaching a second motor to the bus.
4. Double-click on each of the motors to enter motor data. You can copy data from one motor to another by using the copy and paste functions, as described in Copy and Paste.

Adding a Utility

1. Click Utility on the Equipment Palette—the pointer changes into a utility symbol.
2. Place the utility by positioning the utility pointer's leader on the top bus and clicking.
3. With the select pointer , double-click on the utility to enter utility data.

Adding Feeder Breakers

1. Click LV Breaker on the Equipment Palette—the pointer changes into a low voltage breaker symbol.
2. Position the breaker pointer directly over a feeder line (such as a cable or transformer) and click the left mouse button (see figure below). The breaker is inserted into the line.

   
   

   Figure 6: Adding Feeder Breakers

3. If you miss (the breaker doesn't insert into the line and remains red), drag the breaker to the feeder line and let go the mouse button, so that the breaker gets connected to the feeder.
4. Place low voltage breakers on the transformer, cables, motors, motor control center, and panel schedule.
5. With the select pointer, double-click on the breakers to enter breaker data.

Viewing the Entire One-line

Click Zoom Out Full to center your entire one-line on your screen.

Conclusion

Congratulations! You just entered a power system one-line with EasyPower. You can apply what you have learned to your real-world systems. For an example of a larger completed one-line, open the Bigger.dez database in the Samples directory. You can experiment running analysis with this file by selecting Short Circuit, Power Flow, or Harmonics from the ribbon.

For more information on creating one-lines and running analysis, click Help or press F1 while viewing any window in EasyPower to enter EasyPower's fully detailed Help system. You can find additional detailed instructions in the "Making One-Line Diagrams" and "Your First EasyPower One-line" topics in Help.