What is bundled conductor and its advantages?
Bundled conductors are primarily employed to reduce the corona loss and radio interference. However they have several advantages: Bundled conductors per phase reduces the voltage gradient in the vicinity of the line. Thus reduces the possibility of the corona discharge.
What are the advantages and disadvantages of bundled conductors?
The most important advantage of bundled conductors is its ability to reduce corona discharge. When power is being transferred at very high voltages using a single conductor, the voltage gradient around it is high, and there is a high chance that the corona effect will occur – especially in bad weather conditions.
How are bundled conductors made?
A bundled conductor is a conductor made up of two or more conductors, called the sub-conductors, per phase in close proximity compared with the spacing between phases (Fig. 4.21).
What are the disadvantages of bundle conductor?
Disadvantages of Bundled Conductors Increased ice & wind loading. Inspection more complicated, spacers required. Increased clearance requirements at structures. Increased charging kVA which may be a disadvantage at light loads.
What is the use of bundled conductor?
A bundled conductor reduces the reactance of the electric transmission line. It also reduces voltage gradient, corona loss, radio interference, surge impedance of the transmission lines. By making bundle conductor, the geometric mean radius (GMR) of the conductor increased.
What do you mean by ACSR?
These cables are formally known as All Aluminium Conductor (AAC), All Aluminium Alloy Conductor (AAAC) and Aluminium Conductor Steel Reinforced (ACSR). These overhead aluminium conductors are used as power transmission and distribution lines.
Why do we bundle conductors?
What is the use of bundle conductor?
Bundle conductors are used for transmission purpose as it helps in obtaining better voltage regulation and efficiency by reducing the inductance and skin effect present in the power lines. These causes considerable losses in transmission line. There are many advantages of using bundled conductors in transmission lines.
What is GMR and GMD?
GMD & GMR stands for Geometrical Mean Distance and Geometrical Mean Radius. This concept is very useful in Power System for the calculation of Inductance and Capacitance of Transmission Line.
What is difference between ACSR and AAAC conductor?
AAAC has higher strength to weight ratio ranging between 10.6: 11.6 on an equal diameter basis. Offers savings due to reduction in number of towers, foundations and accessories. ACSR has lower strength to weight ratio ranging between 88.4:9.4; hence requires lesser spans than AAAC.
Where is bundle conductor used?
What is the distance of spacer in bundled conductor?
40m
The individual conductors of a bundle are connected by means of spacers, designed in such a way as to maintain a constant separation distance between the conductors, in order to guarantee a constant electrical impedance. The spacers are typically mounted at a relative distance of 40m.
What is surge impedance?
What is Surge Impedance (Zs)? Surge impedance is nothing but the characteristic impedance (Zc) of the lossless transmission line. It is also known as the Natural impedance of the line. As we all know that a long transmission line (length > 250 km) is represented by a distributed parameter model.
What are the 2 different types of conductors?
There are four types of conductors, namely, good conductors, semiconductors, resistors and non-conductors. Non-conductors are also termed as insulators.
Why are bundled conductors used in transmission lines?
Which is better ACSR or AAAC?
What is a line spacer?
Description. SPACERS USED IN TRANSMISSION LINE Typically a line spacer is used to separate the multiple conductors of one phase of a three phase line. As an example, one of the three phases may have two, three or more conductors run from transmission tower to transmission tower.
What is corona effect in transmission line?
DEFINITION: The ionization of air surrounding the high voltage transmission lines causing the conductors to glow, producing a hissing noise, is called Corona Discharge or Corona Effect.
What do you mean by Ferranti effect?
In electrical engineering, the Ferranti effect is the increase in voltage occurring at the receiving end of a very long (> 200 km) AC electric power transmission line, relative to the voltage at the sending end, when the load is very small, or no load is connected.
What is Corona Effect in electricity?
Corona Discharge (also known as the Corona Effect) is an electrical discharge caused by the ionization of a fluid such as air surrounding a conductor that is electrically charged.