Interface Element Information

See Also

 

The Interface Element Dialog is used to redefine or to add the individual elements comprising an interface. Individual lines or transformers, inter-area ties, inter-zone ties, line contingencies, DC lines, injection groups, generators, and loads may make up an interface. Also, several contingent element types are allowed as well. The Interface Element Dialog allows you to add all varieties of interface elements to an interface.

The Interface Element Dialog comes in two very similar forms, depending upon how it was invoked. The dialog may be called from the Interface Information Dialog by clicking on either the Interface Elements Table or the Insert New Element button.

 

The Interface Element Dialog contains the following controls:

Element Type

Specifies the type of interface element being investigated or added. Interface element types available are as follows.

	Type	Description	Auxiliary File Syntax
	Branch	Monitor the MW flow on the branch starting from bus num1 going to bus num2 with circuit ckt. (order of bus numbers defines the direction).	"BRANCH num1 num2 ckt" "BRANCH 123 456 1"
	Area to Area	Monitor the sum of the AC branches that connect area1 and area2.	"AREA num1 num2" "AREA 34 63"
	Zone to Zone	Monitor the sum of the AC branches that connect zone1 and zone2.	"ZONE num1 num2" "ZONE 34 25"
	Branch Open Contingency	When monitoring the elements in this interface, monitor them under the contingency of opening this branch	"BRANCHOPEN num1 num2 ckt" "BRANCHOPEN 123 235 2"
	Branch Close Contingency	When monitoring the elements in this interface, monitor them under the contingency of closing this branch	"BRANCHCLOSE num1 num2 ckt" "BRANCHCLOSE 123 15 4"
	DC Line	Monitor the flow on a DC line	"DCLINE num1 num2 ckt" "DCLINE 123 15 2"
	Injection Group	Monitor the net injection from an injection group (generation contributes as a positive injection, loads as negative)	"INJECTIONGROUP 'name'" "INJECTIONGROUP 'my name'"
	Generator	Monitor the net injection from a generator (output is positive injection)	"GEN num1 id" "GEN 123 AB"
	Load	Monitor the net injection from a load (output is negative injection)	"LOAD num1 id" "LOAD 12 C"
	Multisection Line	Monitor the MW flow on the multi-section line starting from bus num1 going to bus num2 with circuit ckt	"MSLINE num1 num2 ckt" "MSLINE 12 51 D"
	Interface	Monitor the MW flow on the interface given by name	"INTERFACE 'name'" "INTERFACE 'The Name'"
	Generator Open Contingency	When monitoring the elements in this interface, monitor them under the contingency of closing this generator (added in Version 20, build on January 9, 2018)	"GENOPEN num1 id" "GENOPEN 123 1"
	Load Open Contingency	When monitoring the elements in this interface, monitor them under the contingency of closing this load (added in Version 20, build on January 9, 2018)	"LOADOPEN num1 id" "LOADOPEN 121 5"

When the selection for Element Type changes, the available Element Identifiers change to allow you to pick the appropriate elements of that type.

Element Identifiers

Depending upon the Element Type selection, different element identifiers are required to designate the element to add to the interface. You can search through the list of identifiers to find the particular elements you wish to include. Note that the flow direction on transmission line, transformer, and DC line elements will be dependent on which end of the line you choose as the near bus. The flow will always be measured in the direction of near bus to far bus. The flow will be positive when flowing from near to far, and negative when flow from far to near. In addition, line elements also have an additional setting labeled Monitor Flow at To End. This determines which magnitude of flow should be reported. If checked, the flow at the To end of the line will be reported, otherwise the flow magnitude at the From end is used.

Insert

If you came to the Interface Element Dialog by pressing the Insert New Element button on the Interface Information Dialog, only the Insert, Cancel, and Help buttons will be available. Click the Insert button to add the element you have just defined to the list of elements comprising the interface. After you click Insert, the dialog will disappear, and the Interface Elements table on the Interface Information Dialog will contain the element you just added.

Replace, Delete

If you arrived at the Interface Element Dialog by clicking on an element in the Interface Elements Table of the Interface Information Dialog, the Replace, Delete, Cancel, and Help buttons will be visible. Click Replace to modify the interface element according to your specifications on this dialog. Click Delete to remove the element from the interface definition.

Cancel

Click Cancel to close the Interface Elements Dialog without saving your changes.