The following sections discuss emerging cable and conductor technologies…
Broadly, HTLS conductors are classified into four categories: aluminium conductor composite core (ACCC), aluminium conductor steel supported (ACSS), super thermal aluminium conductor invar reinforced (STACIR) and gap-type thermal-resistant aluminium alloy ACSR conductor (gap conductor). Aluminium Alloy Conductor
Underground cables offer better safety against electrocution than overhead wires and are becoming increasingly accepted by state and central transmission utilities. There are several innovations being offered in the cable market that allow utilities to increase their capacities without having to deal with RoW clearance problems. Underground cables require less width for installation compared to the extensive RoW needed for overhead power lines. They are less prone to electromagnetic interference, which can affect sensitive electronic equipment and communication systems. Additionally, they produce lower electromagnetic fields (EMFs) compared to overhead lines, addressing concerns related to potential health effects associated with prolonged exposure to high EMF levels.
Solar cables are another cutting-edge technology gaining traction in the Indian markets for the safe transfer of energy from solar panels to inverters, ensuring stability. They are used as connections for vital equipment and function as a means of transporting solar energy throughout a solar system. They can withstand severe weather conditions because of their exceptional mechanical strength. Over the course of a solar project, these cables are usually installed outdoors and exposed to high temperatures. These modern cables are designed to withstand harsh weather conditions and outdoor settings. They are constructed from premium materials that are resistant to heat, moisture, cold and ultraviolet rays, guaranteeing the solar energy system’s dependability and safety. Additionally, high quality solar cables enable solar panels to operate more efficiently, producing cleaner energy and lowering carbon emissions.
Although gas-insulated lines (GILs) have not been widely adopted in the market, they are gaining traction globally. In situations where RoW is inaccessible for the transmission of electricity, GILs are a practical substitute for overhead wires. This is mainly because they can be placed in ditches, tunnels and even below ground. In addition, GILs have less resistive losses compared to overhead wires and provide increased dependability with reduced fire risks. The insulating medium in GILs are sulfur hexafluoride and nitrogen hexafluoride. Its primary insulation consists of aluminium conductors supported by sealed tubes that are pressurised with a gas mixture of nitrogen and sulphur hexafluoride in an 80:20 ratio.
Smart cables are a result of the incorporation of sensors and communication technologies into power and control lines. These cables have built-in health and performance monitoring, which allows them to instantly identify problems such as damage and overheating. This proactive maintenance strategy improves the overall reliability of electrical systems and helps avoid costly downtimes.
Net, net, there is an increased deployment of cables and conductors that minimise RoW requirements and operate efficiently at high temperatures. Going forward, the use of lightweight and flexible cables is expected to gain traction. These include cables made of light materials such as nanotubes, graphene and high-strength polymers that are easy to install and reduce the risk of damage. Overall, conducting a cost-benefit analysis to suit specific requirements is essential for achieving the best results.
The transmission sector in the country has grown significantly in the past few years. As of October 2021, the total transmission line length in the country stood at 450,552 ckt. km (220 kV and above). […]
Towers are a crucial part of a transmission line project, carrying overhead lines at a safe height over the ground, right from the generation plant to the load centres. On an average, towers and their […]
Tower costs typically range from one-fourth to half of total transmission line costs. As such, design optimisation could result in reasonable savings. Consequently, new designs, solutions and construction techniques for transmission towers are garnering significant […]
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