Page Comparison

Conductor (bundle)

Number of conductor defined by the number of phase plus the number or ground wires.

Specify the phase number to which the conductor belongs. Several conductors may have the same phase number. All conductors having the same phase number are lumped together and will be considered as a single equivalent conductor in the R L C matrices.

For example, if you want to compute the line parameters of a three-phase line equivalent to a double-circuit line, you specify phase numbers 1, 2, 3 for conductors p1, p2, p3 (circuit 1) and phase numbers 3, 2, 1 for conductors p4, p5, p6 (circuit 2), respectively.

If you prefer to simulate this line as two individual circuits and have access to the six-phase conductors, you would rather specify phase numbers 1, 2, 3, 6, 5, 4 respectively for conductors p1, p2, p3, p4, p5, and p6.
In three-phase systems, the three phases are usually labeled A, B, C. The correspondence with the phase number is 1, 2, 3, 4, 5, 6, 7, 8, 9,. = A, B, C, A, B, C A, B, C.
You can also use the phase number to lump conductors of an asymmetrical bundle. For ground wires, the phase number is forced to zero. All ground wires are lumped with the ground and they do not contribute to the R L C matrix dimensions.

Specify the horizontal position of the conductor in meters or feet. The location of the zero reference position is arbitrary. For a symmetrical line you normally choose X = 0 at the center of the line.

Specify the vertical position of the conductor (at the tower) with respect to ground, in meters.

Specify the vertical position of the conductor with respect to ground at mid-span, in meters.

The average height of the conductor is given by:

Y_{average}=Y_{min}+\frac{sag}{3}=\frac{2Y_{min}+Y_{tower}}{3} \; \; \; (EQ5)

Where:

• Y_tower: height of conductor at tower

• Y_min: height of conductor at mid span

• sag=Y_tower-Y_min

Instead of specifying two different values for Y_tower and Y_min, you may specify the same Y_average value.

Image Removed

Image Added

Specify one of the conductor or bundle type numbers listed in the first column of the table of conductor characteristics. See section Conductor & bundle characteristics