In this tutorial you will learn how to edit the properties of conductors in your design. This tutorial assumes you have completed and understood Tutorial 1. If you have not, it is highly recommended you do so before starting this tutorial. At the end of this tutorial you will be able to:

  • change the number of wires that make up the logical conductor,
  • change the conductor type (eg: Leo AAC, Mango ACSR/GZ, etc),
  • set the tension of the conductor, either by specifying the stringing tension, or by inputting the observed tension parameters.

Conductor Wires

A logical conductor is composed of one or more wires. These wires all follow the same path, in terms of which poles they are strung between, and for a given pole are all on the same attachment point. However, each wire is pinned to an attachment point at a different position. Examples of this are shown below:


The first image shows a single conductor composed of two wires, strung across a pole with a Generic Clamp attachment point. The second image shows a conductor composed of three wires, in this case struct across a pole with a Crossarm Suspension attachment point. 

When you string build a conductor using the Conductor Tool, by default it creates a conductor with a single wire. To change the number of wires in a conductor, first make sure it is selected (if not, us the Move and Selection Tool to select it). In the right side menu you should see a section with the fields Type, Group Size, and Ruling Span.

The Group Size field refers to the number of wires that compose a logical conductor. Change this number to change the number of wires in a conductor.

Conductor Type

In the same section of the right side menu you should be able to see the field Type. This refers to the type of conductor that we are modelling. The type of a conductor specifies its diameter, breaking load, weight, elasticity, etc. These parameters are used to model things like conductor sag, blowout, pole tip-load, etc. You can set the type of a conductor by selecting it, and clicking on the button in the Type row of the right side menu. The button is labelled with the name of the current type of the conductor (in the above image it is "Mercury AAC"). Clicking on this button will bring up with Conductor Library, where you can choose different conductor types from the inbuilt library. The Conductor Library also has an import and export function for custom conductors. The below image shows what you should see:

Select the conductor type you want, and left-click on the appropriate row.

Conductor Tension

There are two ways you can set the tension of a conductor. The first is by directly setting its tension (either in kilo Newtons or as a percentage of the cable breaking load). This method is usually used for conductors that will be strung up based on the design you are developing. The second method is to specify the tension by using observations of the existing conductor taken in the field. This is useful for modelling existing conductors.

Specifying Tension Directly

To specify the raw tension, select the conductor, and in the right side menu look for the Tension section. It looks something like this:

Here you can change either the kN (kilo Newton) value, or the CBL % (percent of cable breaking load) value. You will notice that when you change on value, the other changes correspondingly.

Tension from Field Data Observations

For existing an existing conductor you may not directly know the current tension. Instead you would need to go out on site, take some measurements, and then derive the tension from the observed values. There are several methods of obtaining the tension from field observations. Power Lines Pro has the ability to automatically derive the conductor tension using the following methods (as outlined in AS/NZS 7000):

  • Sight Board
  • Offset
  • Height Stick
  • Clino
  • Wave
  • Swing
To input the conductor measurement using one of these methods, select the conductor, then click then on the Use Field Data button in the tension section of the right hand menu. The section will expand to show all of the conductor spans. Choose the span that you performed the measurements on out in the field. The section will then expand again to show you the list of available methods. This should look something like this:

Now click on the specific method you want to use to derive the conductor tension. This will then bring up input fields for the parameters for that particular methods. When you fill in the required fields for the chosen method, the conductor tension will be automatically calculated and displayed below. Click the Save Tension And Close button to apply the tension to the conductor. Here is an example using the Height Stick Method:


This completes this tutorial. We really value your feedback, queries, suggestions, send them all our way!