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BUNDLED CONDUCTORS

Bundled Conductors
Bundling of conductors in transmission line has been 
studied for as long as the transmission lines were first 
constructed. 



Bundle is define in the webster dictionary as several objects or a quantity of material gathered or bound together. As for the case of conductors in a transmission line, bundling is also a good way in minimizing power loss. An in-depth discussion of this will be tackled in the coming articles, as for now, we will discuss the general purpose this type of application is made for.

4 Conductors Bundled


Creating a bundle of conductors is done by having two or more conductors per phase. This is usually applied in voltage level ranging above 230 kV. This level of voltage rating is also popularly known as EHV or extra high-voltage. If you are wondering how bundling of conductors can help reduce losses, let us first go back to the very basic of electrical study. Recall that electric current passes more through less resistive conductors and if you have a conductor say a 336 ACSR compared to a phase bundled conductor of two 336 ACSR, by current divider principle, the same current that passes to the former set up is equally divided in the former. Thus, through the power loss formula of Ploss = I*I*R, the bundled conductors carries half the current of the first configuration. So, setting economic concern aside, having a bundled conductor is a very efficient way of minimizing line loss in the conductors.

There are many ways of bundling conductors, using three conductorsto bundle are usually done by having the conductors creating an equilateral triangle formation with its vertices as its conductors placement. Calculating bundled conductors usually utilizes the GMD(Geometric Mean Distance) method and the GMR(Geometric Mean Radius)method. A bundled conductor doesn't necessarily means that the current are exactly divided between the conductors unless there is a transposition of the conductors within the bundle.

Another good application of bundling is also realized in minimizing  skin effect and corona in the conductors. Also according to William Stevenson Jr., reduced reactance is the other equally important advantage of bundling. Increasing the number of conductors in a bundle reduces the effects of corona and reduces the reactance.
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