PSCAD contains a variety of pre-constructed Overhead Line Towers. The tower components are used to define the geometric configuration of the transmission line system within the The TLine/Cable Configuration Editor. The Universal Tower component is a special transmission line tower that allows the user to enter conductor geometric data in X, Y coordinates, instead of in terms of conductor spacing.
Note that if conductors are grouped into circuits via the Grouping parameter, the load flow RXB data will be displayed in the output file for 6, 9 and 12 conductor towers.
More: |
Graphic of conductor sag is |
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Choice |
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Select visible or hidden. Selecting visible will display the conductor sag graphic on the tower component:
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Ideal transposition of this circuit is |
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Choice |
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Select enabled or disabled. Selecting enabled will assume ideally transposed conductors in the calculation of the line constants. See Conductor Transposition for more details. |
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Shunt conductance |
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REAL |
Literal |
Enter the shunt conductance of the transmission line [S/m]. |
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Name |
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Text |
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Enter a descriptive name for the tower, such as the actual tower number from your system |
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Total Number of Conductors |
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Choice |
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Enter the total number of conductors, excluding ground wires (maximum 12). |
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Tower/Conductor/ Ground Wire Placement (Varies with Tower) |
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REAL |
Literal |
Enter the geometric spacing data for the tower, conductors and ground wires as per the individual tower components [m].
NOTE: If conductor X, Y coordinate data entry is preferred, see the Universal Tower |
Data entry method |
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Choice |
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Select from library file or direct. See Using/Maintaining a Conductor Library for more information on using conductor libraries. |
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Path to conductor library file |
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Text |
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Enter the absolute path to a conductor library file. See Using/Maintaining a Conductor Library for more details.
This parameter is only enabled if Data entry method | from library file is selected. |
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Conductor style is |
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Choice |
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Select solid core, hollow or stranded type. |
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Grouping |
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Choice |
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Enable grouping if you would like to organize the conductors them into circuits.
This is important for the display of double-circuit line constants in load flow RXB format in the output file.
This parameter is enabled only if Total Number of Conductors is set to 6, 9 or 12, and Ideal Transposition is enabled. |
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Name |
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Text |
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Enter a descriptive name for the conductor type. Only one conductor type per tower is allowed. |
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Outer radius |
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REAL |
Literal |
Enter the outer radius of the conductor assembly. If stranded, then this value is the radius from the centre to the edge of the outer strands [m].
When bundled conductors exist (i.e. Total bundled sub-conductors > 1), this value is the individual outer radius of each sub-conductor in the bundle.
This parameter is only enabled if Data entry method | direct is selected. |
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Inner radius |
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REAL |
Literal |
Enter the inner radius of the conductor assembly [m]. Must be less than the outer radius.
This parameter is only enabled if Path to conductor library file | hollow is selected. |
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Strand radius |
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REAL |
Literal |
Enter the radius of a single conductor strand [m].
This parameter is only enabled if Path to conductor library file | stranded is selected. |
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Total Number of Strands |
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INTEGER |
Literal |
Enter the total number of strands that make up the entire conductor. |
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Total Number of Outer Strands |
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INTEGER |
Literal |
Enter the total number of strands that line the circumference of the conductor assembly only (not the total number of strands for the entire conductor). |
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DC resistance (entire conductor) |
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REAL |
Literal |
Enter the DC resistance of the entire conductor assembly (i.e. all strands included if stranded) [W/km].
When bundled conductors exist (i.e. Total bundled sub-conductors > 1), this value is the individual DC resistance of a sub-conductor in the bundle.
This parameter is only enabled if Data entry method | direct is selected. |
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Relative permeability |
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REAL |
Literal |
Enter the relative permeability of the conductor material. |
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Sag (all conductors) |
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REAL |
Literal |
Enter the sag for all conductors. This is the difference between the height at the tower, to the height mid-span [m]. |
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Total bundled sub-conductors |
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Choice |
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Select 1 to 15. |
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Bundle configuration is |
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Choice |
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Select symmetrical or asymmetrical. If asymmetrical is selected, the X, Y coordinates of each sub-conductor must be entered in the Asymmetrical Bundling Position Data parameter page. See The PSCAD Line Constants Program for more details. |
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Sub-conductor spacing |
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REAL |
Literal |
Enter the distance between sub-conductors in the bundle [m].
This parameter is only enabled if Bundle configuration is | symmetrical is selected. See The PSCAD Line Constants Program for more details. |
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Bundle graphic is |
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Choice |
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Select visible or hidden. Selecting visible will display the bundle graphic on the tower component:
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Conductor C# (X,Y) |
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REAL |
Literal |
Enter the geometric X, Y coordinates for each conductor in the right of way [m] |
Total number of ground wires is |
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Choice |
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Select the number of ground wires (1 or 2) for this tower. |
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Ground wires are |
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Choice |
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Select whether or not the ground wires are identical.
This parameter is enabled only if Total number of ground wires is |2 is selected. |
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Ground wire elimination is |
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Choice |
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Select enabled or disabled. If enabled is selected, the ground wires will be mathematically eliminated. |
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Data entry method |
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Choice |
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Select from library file or direct. See Using/Maintaining a Conductor Library for more information on using conductor libraries. |
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Path to ground wire library file |
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Text |
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Enter the absolute path to a conductor library file. See Using/Maintaining a Conductor Library for more details.
This parameter is only enabled if Data entry method | from library file is selected. |
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Name |
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Text |
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Enter a descriptive name for the ground wire type. |
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Outer radius |
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REAL |
Literal |
Enter the outer radius of the ground wire [m].
This parameter is only enabled if Data entry method | direct is selected. |
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DC resistance |
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REAL |
Literal |
Enter the ground wire DC Resistance [W/km].
This parameter is only enabled if Data entry method | direct is selected. |
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Relative permeability |
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REAL |
Literal |
Enter the relative permeability of the ground wire. |
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Sag (all ground wires) |
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REAL |
Literal |
Enter the sag for all ground wires. This is the difference between the height at the tower, to the height mid-span [m]. |
Ground Wire G# (X,Y) |
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REAL |
Literal |
Enter the geometric X, Y coordinates for each ground wire in the right of way [m] |
Asymmetrical Bundling Position Data
Sub-Conductor # - X Postion |
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REAL |
Literal |
Enter the geometric X-coordinates for the bundled sub-conductors, about the bundle centre point [m]. |
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Sub-Conductor # - Y Postion |
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REAL |
Literal |
Enter the geometric Y-coordinates for the bundled sub-conductors, about the bundle centre point [m]. |
Phase/Node Connection Information
Conductor # (C#) |
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INTEGER |
Literal |
Enter the connection number for the corresponding tower conductor.
This number will indicate to which external electrical connection on the Overhead Line Interface this conductor is to be attached |
