Operationalised an extremely versatile set-up, considering all the design options mapped to geo-technical conditions applicable globally.
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Sterlite Technologies Limited (STL) undertook the challenge of supplying and installing of Optical Ground Wires (OPGW) on GETCO&#;s old 220kV transmission line.
Critical attributes and challenges
The most critical attribute of this project was that the OPGW was to be strung on 30 Year old towers which were built in accordance to the old BIS standard. This placed emphasis on the OPGW to be of a very light and at the same time this was to be installed in one of India&#;s hottest regions, which meant theconductivity of the OPGW should be highenough to evacuate the fault even when theconductor was at a temperature of 50°C andstill not to exceed 200°C even in the worst case scenario.
TTF Power manufactures and supplies formed wire products and accessories for power transmission and distribution systems. Our formed wire products are made of wires and strands that have been previously been preset during manufacture into the helical structure that they take in the completed rope. A greatly preformed rope reduces internal stresses, eases rope handling and gives more distribution of load on the wires and strands.
Formed wire is also known as preformed wire, helical or shaped wire. They are used in the overhead transmission lines to protect the conductors from abrasion and corrosion caused by the strong winds.
They run smoother and uniformly, give greater flexibility and gives longer service life in bending. The preformed wires can be in categorized according to the area of application which includes transmission, distribution, substation and fiber utility.
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Distribution tie is used as an alternative for armor rods as it has a tie wire and encased with an insulator. A distribution tie is installed with a pad when used on the naked conductor. Its main purpose is to offer protection against abrasion due to the constant movement of the conductor. They are made from aluminum steel to help secure the conductors to the top groove of the interchangeable insulators.
This type of preformed wire is designed to create a tight grip on the conductor. The grip prevents distortion of the conductor from external forces as the grip is uniform. The design provides the required holding strength that will support the continuation of the conductors. It is easy to install as it has a simple design. It is highly recommended for stay termination on wood pole construction.
These formed wires play a protective role on the transmission lines as they shield the conductors from the effects of bending, abrasion and compression. They are easy to install and they are marked with a different color from the rest of the formed wires.
This is a formed wire that is used for clamping conductors along the longitudinal axis. The arms of the clamp are extended outwards on the opposite side of the conductor. The sections of the conductors are rested on the arms where the cable is free to oscillate within the given arms.
The line guard is designed to protect the conductor by reducing the bending which in return minimizes the effects of corrosion and abrasion on the conductors. The protection provided by the line guard depends on the environmental factors, temperature and tensional forces that are exerted on the conductor.
The sole purpose of the spiral vibration damper is to reduce vibrations on the conductors. This helps reduce the stress that is caused by the vibrations of the conductors. The installation can either be single installation or double installation. They are used with other conductors to handle the different power capacities. It is non corrosive and can withstand high temperatures.
This type of formed wire is used to join two or more conductors so that they end up forming a strong mechanical bond at the point of their union. The joining also forms an electrical termination point such that the electric current cannot flow beyond that point. The conductors can be welded or soldered at the splice in order to enhance their bond.
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Suspension and support are those product designed to reduce the static and dynamic stresses at the support point which makes the conductor protected against the effects of the oscillations caused by the strong winds. These include:
Aluminum suspension clamp &#; this is intended for use on all aluminum-based conductors. The armor rods are placed on over the conductors at suspension points to minimize the static and dynamic stresses at the ends of the clamps. They are have an aluminum alloy body, galvanized steel hardware keeper and a stainless steel cotter pin.
Cushion grip suspension &#; they are intended for use on all aluminum based conductors and are designed to reduce the static and dynamic stresses at the support point. The conductor is cushioned by field proven, integral elastomer inserts which guard against abrasion, wear and fatigue.
End sleeves &#; these are used to ensure the proper application of guy grip dead ends and big grip dead ends.
They are made from galvanized steel and are compatible with guy grip dead ends and big grip dead ends.
They are designed for galvanized bridge strand and aluminum-clad steel cables.
Tension dead end &#; this is a dielectric dead end designed to terminate short span, low tension ADSS fiber optic cables in low voltage environments. It is a single layer component that offers an economical solution for very light loads.
Dielectric suspension &#; this is specifically designed for installation on ADSS cables and is different than suspension OPGW.
They have a double layer of rods that offer critical protection against tearing of the plastic jacket during unbalanced longitudinal loading of the cable while providing substantial holding strength.
It uses a combination of structural reinforcing rods to reduce compression clamping and bending stresses on the cable and glass fibers.
The double layer of rods offers critical protection against tearing of the plastic jacket during unbalanced longitudinal loading of the cable while providing substantial holding strength.
Dielectric dead end &#; the dead end component is required to transfer axial tensile loads and distribute radial compressive forces through the plastic jacket and onto the internal strength members without damaging the fragile plastic jacket or internal optical fibers.
The fittings and grounding accessories can be included in the same container with the suspension.
They offer limited tension, medium tension and high tension dead ends.
ADSS corona coil &#; these are designed to reduce electrical stress at the ends of the metal rods of dielectric dead ends and suspensions applied on ADSS cables installed in high voltage electrical fields.
They are made from light material that help during the swinging of the cables caused by strong winds.
A formed wire is a helical shaped wire which is made using a wire spool. It can transform to almost any form depending on the application, often including sets of various lengths and sizes.
There are seven common types of preformed wire:
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