Branch Options (Edit Mode)

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The Branch Options dialog is used to view and modify the parameters associated with each transmission line and transformer in the system. You can also insert new transmission lines and delete existing transmission lines from this dialog. From this dialog, you can also open dialogs for attached devices.

The Edit Mode version of this dialog is very similar in content to its Run Mode counterpart.

 

The Branch Options dialog has the following fields:

From Bus Number and Name

From Bus number and name. For transformers, the from bus is the tapped side.

To Bus Number and Name

To Bus number and name.

Circuit

Two-character identifier used to distinguish between multiple lines joining the same two buses. Default is ‘1'.

Find By Numbers

To find a line or transformer by its bus numbers, enter the from and to bus numbers and the circuit identifier. Then click this button. Use the spin button to cycle through the list of lines and transformers in the system.

Find By Names

To find a line or transformer by the names of its terminal buses, enter the from and to bus names and the circuit identifier. Then click this button.

Find…

If you do not know the exact from and to bus numbers or names you are looking for, you can click this button to open the advanced search engine.

From End Metered

This field is only used for lines and transformers that serve as tie lines, which are lines that join two areas. If this field is checked for a tie line, then the from end of the device is designated as the metered end. Otherwise the to end is metered. By default, the from end is metered. The location of the metered end is important in dealing with energy transactions because it determines which party must account for transmission losses.

Default Owner (Same as From Bus)

Read-only check-box that indicates whether the line’s owner is the same than the from bus’ owner.

From and To Bus Area Name

Name of control area in which each terminal bus is located.

From and To Bus Nominal kV

Nominal voltage level of each terminal bus, in kV.

Labels

Clicking on this button will open the Label Manager Dialog listing all the labels assigned for the selected branch.

OK, Save, Delete, Cancel, and Help

OK saves your changes and closes the dialog. Save saves your changes but does not close the dialog; this allows you to use, for example, the Find By Number command to edit additional transmission lines. Delete deletes the current branch. The Delete button is not visible if editing a branch that was accessed via the oneline diagram. Cancel closes the dialog but does not save any changes. Help opens this help topic.

 

Display

See Branch Options: Display.

 

Parameters

See Branch Options: Parameters.

 

Transformer Control

This tab is only visible for transformer objects. See Transformer Control for details on modeling either LTC or phase shifting transformers.

 

Series Capacitor

This tab is only visible for series capacitor objects. See Series Capacitor for details on modeling series capacitors.

 

Fault Info

The parameters on this tab are used when running a fault analysis study. The values represent the zero sequence impedance and zero sequence line shunt admittances for the analysis. By default, the positive and negative sequence line impedances and line shunt admittances are the same as the load flow impedance. The same fields are used for transformers, along with the configuration field. The configuration field defines the winding type combinations for the transformer (wye, delta, etc.) As a default, Simulator assumes a grounded wye to grounded wye transformer, which has the same model as a transmission line. Usually transformers are not of this type, and the proper type would need to be defined either manually or loaded from an external file in order for the fault analysis to be accurate.

 

Owner, Area, Zone, Sub

The Default Owner (Same as From Bus) read-only check-box indicates whether the branch’s owner is the same as the from bus’ owner. Transmission elements can have up to four different owners, each with a certain owner percentage. To add an owner of a transmission element, change one of the Owner fields to a new owner number, and update the owner percentages accordingly. Note that if you do not set the new owner percentages of all specified owners such that the total is 100%, Simulator will normalize the percentages such that the total is 100% when you click Save or OK on the branch options dialog.

The area, zone, and substation to which the From and To buses belong, are also shown.

 

Custom

This page of the dialog contains two sections: custom fields and memo. 

The custom fields section allows access to setting and changing the values for custom fields that have been defined for the branch. Defining custom fields is detailed in Custom Field Descriptions.

The Memo section of the dialog is simply a location to log information about the branch. Any information entered in the memo box will be stored with the case when the case is saved to a PWB file.

 

Stability

This tab is only visible with the Transient Stability Add-On tool. Any branch-specific transient stability modeling information is contained on this tab. For more information see the Transient Stability Data: Object Dialogs.