Table of Contents
- 1 Why is bundle conductor is used?
- 2 What are bundle conductor and write its application?
- 3 What is GMD and GMR?
- 4 How many insulators are in a kV?
- 5 What is double circuit line?
- 6 How many insulators are in 11KV line?
- 7 How does bundling of conductors reduce line losses?
- 8 How many bundle conductors are in a 765 kV transmission line?
Why is bundle conductor is used?
Bundling of conductors leads to increases in capacitance. An important advantage of bundled conductors is its ability to reduce corona discharge. Reduction in the formation of corona discharge leads to less power loss and hence improved transmission efficiency of the line. Reduction in communication line interference.
What are bundle conductor and write its application?
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 is ACSR bundle conductor?
Aluminium conductor steel-reinforced cable (ACSR) is a type of high-capacity, high-strength stranded conductor typically used in overhead power lines. The outer strands are high-purity aluminium, chosen for its good conductivity, low weight, low cost, resistance to corrosion and decent mechanical stress resistance.
What is GMD and GMR?
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.
How many insulators are in a kV?
We generally use two parts pin insulators for 33KV, and three parts pin insulator for 66KV systems.
How is GMR calculated?
In the above equation, Ds = self-GMD or GMR = 0.7788r. GMR depends upon the shape of the conductor and the size of the conductor….
- Daa = Da’a’ = Dbb = Db’b’ = Dcc = Dc’c’ = Self GMD of conductor.
- Daa’ = Da’a = Distance between a and a’
- Dbb’ = Db’b = Distance between b and b’
- Dcc’ = Dc’c = Distance between c and c’.
What is double circuit line?
Double circuit transmission line refers to the arrangement in which a total of six conductors are provided to make two different transmission circuit. In double circuit transmission line, there are two circuits each consisting of three conductors corresponding to three phases.
How many insulators are in 11KV line?
In a 11 kV system we generally use one part type insulator where whole pin insulator is one piece of properly shaped porcelain or glass. As the leakage path of insulator is through its surface, it is desirable to increase the vertical length of the insulator surface area for lengthening leakage path.
Which is the individual conductor in a bundle?
The individual conductor in a bundle is defined as a sub conductor. Bundled conductors in transmission lines are commonly used to increase electrical capacity and reduce corona and radio noise at voltages above 200 kV. Bundle conductors consist of several parallel cables connected at intervals by spacers, often in a cylindrical configuration.
How does bundling of conductors reduce line losses?
According to Ohms Law, reduced reactance reduces the line losses. Bundling of conductors leads to a reduction in line inductance. We know that inductance of a line is given by, By making bundled conductor, the geometric mean radius (GMR) of the conductor increased.
How many bundle conductors are in a 765 kV transmission line?
American Electric Power (AEP), one of the first utilities in the US to build 765 kV lines currently uses a six bundle conductor design, while China has built 1,000 kV lines with 8 bundle conductors.
How many sub-conductors are used to make BC?
Whenever you get free time go and watch a transmission line of 220 KV there you can see bundle conductor. BC is made up of two or more sub-conductors which is used as a single line conductor. we all know that bundle conductors are used if the line voltage is greater then 220 KV, in 220 KV line how many sub-conductors are used to make BC?