See Also
The Switched Shunt Information dialog can be displayed by placing the cursor on a switched shunt display object and right-clicking or right-clicking on a switched shunt record in the Switched Shunt Display and choosing Show Dialog. This is very similar to its Edit mode counterpart. The dialog has the following fields:
Bus Number
Find By Number
To find a switched shunt by its bus number, enter the number into the Bus Number field. Then click the Find By Number button.
Bus Name
Unique alphabetic identifier for the bus to which the switched shunt is attached, consisting of up to eight characters. This dropdown box lists the names of all the switched shunt buses in the case with valid display filters.
Find By Name
To find a switched shunt by its name, enter the bus name into the Bus Name field (case insensitive). Then click the Find By Name button.
Shunt ID
Since multiple switched shunts are allowed on a single bus, each shunt is identified by a unique Shunt ID.
Find…
If you do not know the exact switched shunt bus number or name you are looking for, you can click this button to open the advanced search engine.
Status
Status of the switched shunt, either Closed (connected to terminal bus) or Open (not connected). On the oneline, the switched shunt can be opened by placing the cursor on the (red) circuit breaker box and clicking, and it can be closed by placing the cursor on the (green) box and again clicking. You can also use this status field to change the switched shunt's status. Note that the switched shunt is only available for automatic control when its status is closed.
Status Branch Added in Version 20
Line shunts can be modeled as controllable switched shunts by linking their status to the status of a branch. The Status Branch field specifies a branch whose status will affect the status of a switched shunt. If specified, a switched shunt can only be closed if is has a status of closed and its Status Branch also has a status of closed. If the Status Branch has a status of open, the switched shunt will also have a status of open.
Click the Choose Branch button to open a dialog that allows selection of this branch. Click the Remove button to no longer associate this switched shunt with a branch.
Energized
Indicates if the switched shunt is energized. This is not the same as the Open or Closed status. A switched shunt may be in-service itself (closed) but not be energized, based on the statuses of other devices around the switched shunt. For example, in a full topology model, it is not uncommon for a switched shunt to have a status of Closed, but the switched shunt is not energized if a branch of type Circuit Breaker connecting the switched shunt to the system has a status of Open.
Added in Version 20 If a switched shunt has a Status Branch assigned, whether or not a switched shunt is energized will be based on the status of this branch. If the branch is open, the switched shunt will not be energized.
Labels
Clicking on this button will open the Label Manager Dialog listing all the labels assigned for the selected switched shunt.
Parameters
Nominal Mvar
Amount of reactive power that would be supplied by the switched shunt if its terminal voltage were one per unit (capacitive is positive).
Actual Mvar
Actual reactive power in Mvar being injected into the system by the switched shunt (capacitive is positive). The Actual Mvar field is equal to the Nominal Mvar field multiplied by the square of the terminal bus' per unit voltage.
Nominal MW
This field is only visible when a switched shunt already has a non-zero MW value assigned. This could occur when the switched shunt has been read from an external file as a Bus Shunt with associated MW. The MW value can also be assigned through the case information display for a switched shunt. The MW component of a switched shunt has no controllability.
Actual MW
This field is only visible when a switched shunt has a non-zero Nominal MW value assigned. The value displayed is the actual real power in MW being injected into the system by the shunt. The Actual MW field is equal to the Nominal MW field multiplied by the square of the terminal bus' per unit voltage.
Control Mode
Information about this option can be found in the Switched Shunt Control topic.
Control Options
In order for a switched shunt to be on automatic control, switched shunt control must be enabled for the area to which it belongs and switched shunt control must be enabled for the case as a whole. The two checkboxes here allow easy access to enabling or disabling shunt control at these two different levels: Area Shunt Control Enabled or Case Shunt Control Enabled. Keep in mind that changing the options here can impact more that just the current shunt.
Control Regulation Settings
Information about these options can be found in the Switched Shunt Control topic.
Switched Shunt Blocks
Information about these settings can be found in the Switched Shunt Control topic.
Voltage Control Groups Added in Version 19
Specify if the switched shunt belongs to a voltage control groups. For more information on how voltage control groups work see the Switched Shunt Control topic.
Control Options: Advanced Options
Information about these options can be found in the Switched Shunt Control topic.
Control Options: SVC Control Options
The SVC Control Options tab contains control options parameters specific for the SVC Shunt Control.
Control Options: SVC Fixed Shunt Options
The SVC Fixed Shunt Options tab contains information of the SVC controlling the shunt (SVC Shunt Control).
Control Options: Time Step Options
The Time Step Options tab contains control options specific for the Time Step Simulation tool.
Typically switched shunts are treated as open circuits in the zero sequence data for fault analysis. However, it is possible to define zero sequence admittance blocks to be used. The blocks work similarly to the load flow Switched Shunt Blocks discussed above. Usually there will be the same number of blocks in the zero sequence data as in the load flow data. Simulator will determine how many blocks were switched in for the power flow solution, and then use the zero sequence block data to calculate the zero sequence admittance for the same number of steps and blocks.
Owner, Area, Zone, Sub
This tab is used to display or change the generator’s owner information, area information, zone, and substation information
Area Number, Area Name
The area number and name to which the switched shunt belongs. The area of the switched shunt can be different than the area of its terminal bus.
Zone Number, Zone Name
The zone number and name to which the switched shunt belongs. The zone of the switched shunt can be different than the zone of its terminal bus.
Owner Number, Owner Name
The owner number and name to which the switched shunt belongs. A switched shunt will belong to the same owner to which its terminal bus belongs.
Substation Number, Substation Name
The substation number and name to which the switched shunt belongs. A switched shunt will belong to the same substation to which its terminal bus belongs.
Custom
This page of the dialog contains three sections: Data Maintainer, Custom Fields, and Memo.
A Data Maintainer may be specified for the switched shunt by clicking on the Specify button. Click the Remove button to unassign a data maintainer.
The custom fields section allows access to setting and changing the values for custom fields that have been defined for the switched shunt. Defining custom fields is detailed in Custom Field Descriptions.
The Memo section of the dialog is simply a location to log information about the switched shunt. 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 contains information that is used with the Transient Stability Add-On tool. Any switched shunt-specific transient stability modeling information is contained on this tab. For more information see the Transient Stability Data: Object Dialogs.
GIC
This tab contains information that is used with the GIC Add-On tool.
The following GIC Input Fields are available:
Per Phase Reactor GIC Grounding Resistance (in Ohms, Zero is Treated as Infinite)
Shunts operating as reactors can provide a conducting path for GIC. By default infinite resistance is assumed. Shunts operating as capacitors always have infinite resistance. Use this field to specify a grounding resistance for reactors on a per phase basis. The total resistance for all three phases is then one third this value.
Scale Conductance for Reactors with Multiple Blocks
The specified resistance applies when all inductive blocks are in service. If using this option, the resistance will be scaled based on how many blocks are in service. If half of the available blocks are in service, the resistance is twice as much.
Neutral Resistance (in Ohms)
This models an extra resistance in the switched shunt neutral that is in series with the three phase resistance of the reactor.