The One-Line Diagram Interface

The One-Line Diagram interface works like most popular CAD systems. Its main feature is a central working area called the viewport that displays your One-Line Diagram. Think of the viewport as a window on the One-Line Diagram surface. At any given time, some or all of the One-Line Diagram is visible through the viewport. For information on navigating the One-Line Diagram, refer to Section 3.5, “Navigating the One-Line Diagram.”

Click the New button to create a new One- Line Diagram.

By default, objects are drawn in black, but you can change the color of objects, as well as special status colors.

3.4.1. Database-Related Objects

The graphic elements of the one-line diagram are called objects, and there are two categories of objects: database-related objects and user-defined objects. Most of the objects that are on a One-Line Diagram are called database-related objects because they represent component attribute and connection information stored in the project. These database objects include the symbol, the datablock, the component name and the connection. Though all of the objects are related, they are, to a certain extent, discrete. This section explains the kinds of objects and their behaviors when you select and move them.

Symbol

The symbol represents a component on the One-Line Diagram. The symbol is the most important object on the One-Line Diagram, and the other objects are to a certain extent subordinate to it. When you select a symbol, the component name and the datablock (if datablocks are visible) for that component are automatically selected as well. Likewise, when you move a symbol, the datablock and component name move as well, maintaining a constant relationship to the symbol. PTW allows you to specify two sets of default symbols for each component type, one set for the ANSI environment setting and another for the IEC environment setting. The default symbols are selected from the following toolbar:

The default symbols assigned to each component icon are specified in the

Project>Options>Oneline option. The first icon allows you to select any component type and any symbol. The other icons select specific component types and display the default symbol.

Symbols show you the

component type. Component Names show you

the name of the associated component.

Datablocks show you important component data.

Connections show you the power system layout.

The default Symbol assignments are specified using the Default ANSI and Default IEC Symbol Assignment buttons. The assignment for the Cable symbol default is shown below. To change the default assignment, select one of the other cable symbols shown in the Graphic Symbol Select window. To add new symbols, refer to the section in the chapter titled "Creating Custom Symbols".

Component Name and Datablock

Component names and datablocks provide information about the component, and cannot exist independently of a symbol. When you select either a component name or a datablock, the corresponding symbol is also selected. However, you can move the component names or datablock independently of the symbol.

The component name displays the name of the component in the project. The component name is a unique identifier that PTW uses to distinguish and sort components. The component name is always visible on the One-Line Diagram. To change the name of a component, see Section 0, “

Bus versus Bus-Node

A bus and a bus-node internally act the same but graphically have the the following differences:

• A Bus-Node is displayed as a Dot, whereas a bus is displayed as a sizeable bar. • A Bus-Node defaults to not displaying the nametag or datablock, whereas the bus

defaults to displaying the nametag and the datablock.

The following picture shows the difference between a Bus and a Bus-Node

Bus-Node Symbol Bus Symbol BUS-2 TX-1 TX-2 C-1 C-2 BUS-1 U1 U2 BUS-3 M1 M2

3.4.2. Auto-Bus Insert

Bus or Bus-node components can be added automatically by connecting two impedance components together.

Bus-Nodes automatically created by connection

The Project-Options can be used to specify whether a Bus is automatically inserted or Bus-Nodes are automatically inserted.

Renaming Components.”

For information on changing the datablock format to show different data, and turning datablocks on and off, see Section 3.10, “Showing Project Data on a One-Line Diagram.”

Connection

Connections appear as simple lines connecting two symbols, and represent the electrical connection defined in the project database. As such, the connection line is defined by the symbols: when you move a symbol, the connection redraws to maintain the simplest possible line between the connected symbols.

To change connections, see Section 3.6.5, “Connecting and Disconnecting Components.” To adjust connection lines vertically and horizontally without changing the connection status, see Section 3.8.2, “Moving Connection Lines.”

3.4.3. User-Defined Objects

In addition to database objects, there are also user-defined objects called textblocks that you can use to annotate your One-Line Diagram, or to include other documentation such as a schedule report on your One-Line Diagram. Textblocks can include any text you want, and are not in any way interactively linked to the project.

For information on adding and editing textblock objects, refer to Section 3.12“Annotating the One-Line Diagram with Textblocks"

3.4.4. Mouse Pointers

Notice that as you move the mouse pointer over various objects, it changes shape. The shape of the pointer indicates the kind of action you can take at that time. Refer to the following table:

When the pointer looks like this

You can do this Refer to

Select multiple objects. Section 3.7.2 “Selecting a Group of Objects.”

Select single objects or move selected objects.

Section 3.7.1, “Selecting Individual Objects,” and Section 3.8.1, “Moving Objects.” Size a bus symbol. Section 3.8.3, “Sizing Bus

Symbols.”

Connect a component. Section 3.6.5, “Connecting and Disconnecting Components.” Move a connection segment

(horizontally).

Section 3.8.2, “Moving Connection Lines.”

Move a connection segment (vertically).

Section 3.8.2, “Moving Connection Lines.” , , Size a textblock in the directions

of the arrows.

“Sizing a Textblock.”

Move a textblock leader. “Moving a Textblock Leader.”