Click the OK button to accept your changes to all of the synchronous machine properties

To change the harmonic properties for a synchronous machine:

1. Click the Harmonics tab to modify the harmonic properties of a synchronous machine (Figure 3-54).

Figure 3-54. Synchronous Machine Property Sheet: Harmonics Tab

Name: The name of the induction machine. This property is for information only and is not editable. Click on the Main tab to modify this item.

Node: The name of the node to which this machine is connected. This property is for information only and is not editable.

Impedance Exponents: Enter the requested values for the following:

• Positive sequence resistance

• Positive sequence reactance

• Grounding sequence resistance

Users Manual Editing Shunt Devices

For additional information on harmonics modeling for synchronous machines, please refer to Chapter 8, Section 8.9.3.

3.7.9 Changing Capacitor Properties

In PSS/ADEPT, there is no limitation on the number of capacitors that may be placed at a node. The total capacitance at each node is the sum of the fixed and switched kvar used. Fixed capacitor banks require a minimum amount of data. Switched capacitor banks require additional information.

If the capacitor type is fixed, the switched capacitor fields will not be editable fields.

To change the properties of your capacitor:

1. Double-click the capacitor to select it and display the Capacitor Property sheet, or, to select a capacitor, right-click, and choose Properties to display the Capacitor Property sheet (Figure 3-55).

Figure 3-55. Capacitor Property Sheet: Main Tab

2. To change the properties of the capacitor:

Name: Specify a unique name for the capacitor on the PSS/ADEPT diagram. The node name appears on the property sheet to indicate the location of the capacitor in the net-work. If you modify the capacitor name, the name of the node to which it is attached will not be affected.

Nominal voltage of capacitor bank (kV): Specify the nominal voltage of the capacitor bank. This voltage may be either line-to-line or line-to-neutral; depending upon which input voltage flag has been specified. If the nominal voltage is not specified, it defaults to the base voltage of the node where the capacitor is placed.

Reactive power capacity: Capacitor kvar at node base voltage and fraction switched in are entered based on whether the capacitor is balanced or unbalanced. For a fixed capacitor, the kvar is assumed to be 100% switched in. The field for fraction switched in is enabled for switched capacitors only. If the capacitor is balanced, only the total kvar over all phases is entered. If the capacitor is unbalanced, kvar at each phase may be entered along with the fraction of kvar that is currently in use. A value of 1.0 indicates 100 percent of the kvar is currently in use.

Type: Specify the capacitor as fixed or switched.

Connection: Specify the capacitor connection as delta (ungrounded) or wye (grounded).

Balance: Specify whether the capacitor is balanced (equal kvar between all phases) or unbalanced.

Switched Capacitor Properties: If the capacitor type is switched, specify the following additional capacitor properties (if the capacitor is fixed, this section will be grayed out):

• Regulated Node: If this node is specified and it is not the same node on which the capacitor is located, then PSS/ADEPT will monitor the voltage at this reg-ulated node.

• Minimum and Maximum Regulated Voltage (pu): Specify the minimum and maximum voltage allowed at the regulated node.

• Switching Increment: This value is equivalent to the portion of the capacitor kvar that will be placed at the node when the largest pu voltage change at any node is less than 0.01 during the load flow solution. The switching increment is used only when the solution option to switch capacitors (see Chapter 4, Section 4.4.1) has been selected. The switching increment is specified as a decimal value between 0.0 and 1.0, where 1.0 is equal to 100%.

• Switching Priority: If there is more than one switched capacitor regulating the same node, you can specify a priority to indicate the order in which the capac-itor is switched on. This option is provided for raw data compatibility and is not currently used in PSS/ADEPT.

• Fraction Switched In: Indicates the fraction of the kvar used, where 1.0 (100%) uses all kvar and 0.0 (0%) uses no kvar. This fraction does not indicate in-service status. PSS/ADEPT can adjust this fraction in the load flow solution when the capacitor switching option is turned on (see Chapter 4, Section 4.4.1).

Users Manual Editing Shunt Devices

Time delay: There are situations where voltage at some location in a network may be influenced by two or more transformers (capacitor banks). In such situations, the trans-former tap (capacitor bank) controllers may fight one another trying to control voltage.

The time delay is used to prevent these controllers from interacting by defining the order in which they attempt control. Controllers with a short time delay will operate before controllers with a long time delay. A short time delay (i.e., zero) is generally assigned to transformer tap controller closest to the source; increasingly longer time delays are assigned to downstream controllers. In this way, upstream transformers are first used to correct voltage problems. Only if unsuccessful will controllers downstream of the first be used. Time delay is a floating-point number (e.g., 1.5). No specific units are assumed.

3. To display the capacitor on the diagram, click once in the Visible check box to place a check mark there.

4. To indicate that the selected capacitor is in service, click the In service check box, which is the default setting. Note that a capacitor bank may be in service even though the fraction switched in is equal to zero.

5. To display analysis results on the diagram for this capacitor, place a check mark in the box labeled Results.

6. To add the selected capacitor to an existing group(s), click the Groups button, and click the box that precedes the group name you want. Click the OK button to accept the assignment.

7. Click the OK button to accept your changes to the capacitor properties.

3.7.10 Changing Standard Fault Properties

A fault is a shunt device that is placed on an existing node in the network. When you perform a fault calculation, nodes that have connected fault devices will be faulted during the solution. A fault is specified by the node to which it is attached, and by the type of fault that will be placed at the node.

Any number of standard faults may be placed at a node. Valid fault types are:

• three-phase-to-ground

• phase-to-ground

• phase-to-ground through an impedance

• phase-to-phase

• phase-to-phase-to-ground

• ungrounded three-phase

For all fault types that are not three-phase-to-ground or ungrounded three-phase, you must specify the phase at which the fault occurs. If you select the phase-to-ground through impedance fault type, the impedance values display.

The fault impedance may be entered and adjusted from the Analysis Options Property sheet under the Short Circuit tab (Chapter 4, Figure 4-15).

To change the fault properties:

1. Double-click the fault to select it and display the Fault Property sheet, or, to select a fault or a group of faults, right-click, and choose Properties to display the Fault Property sheet (Figure 3-56).

Figure 3-56. Fault Property Sheet

2. Enter/select the properties for the fault:

Name: Each item in the PSS/ADEPT network must have a unique name identifier. The fault name has no relation to the node to which it is attached. The node name may not be modified.

Type: Specify the type of fault you want to apply at the node. Valid fault types are:

three-phase-to-ground, phase-to-ground, phase-to-ground through impedance, phase-to-phase, phase-to-phase-to-ground, and ungrounded three-phase.

Phasing: If the fault type is not three-phase, select the phase at which the fault occurs.

If you select the three-phase fault type, the phasing will be set to ABC and you will not be able to edit the phasing field.

3. To display the fault on the diagram, click once in the Visible check box to place a check mark there.

4. To display analysis results on the diagram for this fault, place a check mark in the box labeled Results.

5. To indicate that the selected fault is in service, click the In service check box, which is the default setting. If a fault calculation is performed, an in-service fault will be consid-ered and the results will be available on the diagram and in the shunt current report. If the fault is out of service, it will be invisible to the short circuit analysis. This option allows you to remove fault devices from the system without permanently deleting them from the network.

6. To add the selected fault to an existing group(s), click the Groups button, and click the box that precedes the group name you want. Click the OK button to accept the assignment

Users Manual Workspace Management

3.8 Workspace Management

PSS/ADEPT’s Workspace Management feature allows you to capture a customized environment for future use. You can save the current toolbar and window positions, and restore this workspace either automatically the next time you start the PSS/ADEPT application, or at any point while working in PSS/ADEPT. Additionally, network diagram data and options may be saved with the workspace. There is no limit to the number of workspaces you can create.

You may modify the application views and toolbars. For example, you may choose to hide the Equipment List View and display only the Diagram Toolbar. For more information on modifying the application views, refer to Chapter 2, Section 2.1.

To open the most recently saved workspace automatically when you start PSS/ADEPT:

1. Choose File>Program Settings from the Main Menu.

2. Click the Restore last workspace at start-up box. A check mark displays in the box.

3. Click the OK button to accept the assignment. The next time you start PSS/ADEPT, the most recently saved workspace will display.

To retrieve an existing workspace:

1. Choose File>Workspace>Open from the Main Menu. The Open Workspace dialog (Figure 3-57) displays a list of previously saved workspaces.

Figure 3-57. Open Workspace Dialog

2. Click to highlight the name of the workspace you want to display.

3. Click the Open button to display the workspace.

Additionally, the Open Workspace dialog allows you to add new workspaces, remove existing work-spaces, save current workwork-spaces, and order existing workspaces (up or down) on the list.

Delete Move Up

Move Down

To create a new workspace:

1. Open a blank PSS/ADEPT diagram or open a PSS/ADEPT diagram from which you want to create a new workspace.

2. Make changes to your toolbar display and/or location if necessary.

3. Make changes to the diagram properties if necessary.

4. To save the new workspace, choose File>Workspace>Save from the Main Menu. The Save Workspace dialog displays.

5. Click the New (Insert) button and, in the entry space that appears, type a name for the new workspace.

6. Press the Enter key. The system prompts "Save new workspace?"

7. Click the Yes button to save the workspace.

To delete an existing workspace:

1. Choose File>Workspace>Open from the Main Menu. The Open Workspace dialog displays.

2. Click (and highlight) the name of the workspace you want to delete.

3. Click the Delete button to delete the workspace. The workspace is deleted.

To save the current workspace:

1. Choose File>Workspace>Save from the Main Menu. The Save Workspace dialog displays.

2. Click the New (Insert) button, and in the entry space that appears, type a name for the workspace.

3. Click the OK button to save the workspace.

To change the order of workspaces on the list:

1. Choose File>Workspace>Open from the Main Menu. The Open Workspace dialog displays.

2. Click (and highlight) the name of the workspace you want to reposition.

3. Click the Up Arrow button to move the workspace up one position in the list or click the Down Arrow button to move the workspace down one position in the list.