What is the purpose of using OPGW in transmission lines?
What is the purpose of using OPGW in transmission lines?
OPGW is primarily used by the electric utility industry, placed in the secure topmost position of the transmission line where it “shields” the all-important conductors from lightning while providing a telecommunications path for internal as well as third party communications.
What is an OPGW in transmission line?
Optical Ground Wire (OPGW) is a dual functioning cable. It is designed to replace traditional static / shield / earth wires on overhead transmission lines with the added benefit of containing optical fibers which can be used for telecommunications purposes.
What is the function of OPGW?
OPGW or known as Optical Ground Wire is a type of cable or wire that is used in transmission lines construction. It is also known as optical fiber composite overhead ground wire. It can serve as a grounding wire, shielding wire, and at the same time a cable used for communication purposes.
What Fibre is used in OPGW?
Typically OPGW cables contain single-mode optical fibers with low transmission loss, allowing long distance transmission at high speeds. The outer appearance of OPGW is similar to aluminium-conductor steel-reinforced cable (ACSR) usually used for shield wires.
What is the difference between OPGW and ADSS cable?
ADSS is an alternative to OPGW and OPAC with lower installation cost. The cables are designed to be strong enough to allow lengths of up to 700 metres to be installed between support towers. The cable is jacketed to prevent moisture from degrading the fibers.
What is Shield angle?
The Shielding Angle is defined as the angle between an imaginary vertical line extending downward from the overhead ground wire and an imaginary line connecting the ground wire and phase conductor, as shown in figure below.
What Fibre is used in Opgw?
What is full form of ADSS cable?
AFL-ADSS® (All-Dielectric Self-Supporting) fiber optic cable is a non-metallic cable which supports its own weight without the use of lashing wires or messenger cables.
Why DC is not used in transmission?
DC(Direct Current) is not used over AC(Alternating Current) in transmission because DC goes heavy attenuation while transmission over long distance as we do not transform it from Low Voltage (at which it is being generated) to High voltage (for transmission over long distance(I will explain…)) by some direct mean …
What is the range of shield angle kept?
Shielding or Protective Angle For effective shielding, the protective angle should be kept as small as possible. The angle between 20° and 30° is quite safe, and it should not be kept above 40°. Two wires are used in modern high voltage system with wider spacing between the conductor.