Skip to main content

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.

Comments

Popular posts from this blog

PARTS OF A POWER TRANSFORMER

What are the name of the basic parts of a Power Transformer? We can not deny the fact that only a handful of electrical engineering students are presently familiar with power transformers especially on what it looks like. Unlike a transformer we found in our homes, a power transformer’s appearance and construction is somewhat more complicated. It is not just a simple winding with a primary and secondary terminal although basically any transformer has one. The function that a power transformer plays in an electrical system is very important that an electric utility can not afford to loss it during its operation. Our discussion here will focus more on the basic parts and functions of a power transformer that are usually tangible whenever you go to a substation . Although not all power transformers are identical, nonetheless they all have the following listed parts in which the way of construction may differ.

ELECTRIC MOTOR FRAME SIZE STANDARD SPECIFICATIONS

ELECTRIC MOTOR FRAME SIZE STANDARD SPECIFICATIONS How is electric motor frame size being specified? Motor frame dimensions have been standardized with a uniform frame size numbering system. This system was developed by NEMA and specific frame sizes have been assigned to standard motor ratings based on enclosure, horsepower and speed. The current standardized frames for integral horsepower induction motors ranges from 143T to 445T. These standards cover most motors in the range of one through two hundred horsepower. Typical example of where you can locate the frame is shown in Fig 1.2.D – Frame No. The numbers used to designate frame sizes have specific meanings based on the physical size of the motor. Some digits are related to the motor shaft height and the remaining digit or digits relate to the length of the motor. The rerate, or frame size reduction programs were brought about by advancements in motor technology relating mainly to higher temperature ratings of insulating mate

ELECTRIC MOTOR NAMEPLATE SPECIFICATIONS

How do we interpret an electric motor nameplate? Motor standards are established on a country by country basis.Fortunately though, the standards can be grouped into two major categories: NEMA and IEC (and its derivatives). In North America, the National Electric Manufacturers Association (NEMA) sets motor standards, including what should go on the nameplate (NEMA Standard MG 1-10.40 "Nameplate Marking for Medium Single-Phase and Polyphase Induction Motors").