Overhead Line Towers

Graphic of conductor sag is

Choice

Select visible or hidden.  Selecting visible will display the conductor sag graphic on the tower component:

Ideal transposition of this circuit is

Choice

Select enabled or disabled.  Selecting enabled will assume ideally transposed conductors in the calculation of the line constants.  See Conductor Transposition for more details.

Shunt conductance

REAL

Literal

Enter the shunt conductance of the transmission line [S/m].

 Tower name

Text

Enter a descriptive name for the tower, such as the actual tower number from your system

Tower/Conductor/

Ground Wire Placement

(Varies with Tower)

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

Choice

Select from library file or direct.  See Using/Maintaining a Conductor Library for more information on using conductor libraries.

Path to conductor library file

Text

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.

Conductor style is

Choice

Select solid core, hollow or stranded type.

Name

Text

Enter a descriptive name for the conductor type.  Only one conductor type per tower is allowed.

Outer radius

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.

Inner radius

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.

Strand radius

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.

Number of outer strands

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).

DC resistance (entire conductor)

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.

Relative permeability

REAL

Literal

Enter the relative permeability of the conductor material.

Sag (all conductors)

REAL

Literal

Enter the sag for all conductors. This is the difference between the height at the tower, to the height mid-span [m].

Total bundled sub-conductors

Choice

Select 1 to 15.

Bundle configuration is

Choice

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.

Sub-conductor spacing

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.

Bundle graphic is

Choice

Select visible or hidden.  Selecting visible will display the bundle graphic on the tower component:

Total number of ground wires is

Choice

Select the number of ground wires (1 or 2) for this tower.

Ground wires are

Choice

Select whether or not the ground wires are identical.

This parameter is enabled only if Total number of ground wires is |2 is selected.

Ground wire elimination is

Choice

Select enabled or disabled.  If enabled is selected, the ground wires will be mathematically eliminated.

 Data entry method

Choice

Select from library file or direct.  See Using/Maintaining a Conductor Library for more information on using conductor libraries.

Path to ground wire library file

Text

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.

Name

Text

Enter a descriptive name for the ground wire type.

Outer radius

REAL

Literal

Enter the outer radius of the ground wire [m].

This parameter is only enabled if Data entry method | direct is selected.

DC resistance

REAL

Literal

Enter the ground wire DC Resistance [W/km].  

This parameter is only enabled if Data entry method | direct is selected.

Relative permeability

REAL

Literal

Enter the relative permeability of the ground wire.

Sag (all ground wires)

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].

  Sub-Conductor # - X Postion

REAL

Literal

Enter the geometric X-coordinates for the bundled sub-conductors, about the bundle centre point [m].

 Sub-Conductor # - Y Postion

REAL

Literal

Enter the geometric Y-coordinates for the bundled sub-conductors, about the bundle centre point [m].

Conductor # (C#)

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