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Explore power transmission — components, line design, conductors, and techniques for efficient high-voltage energy transfer over long distances.
Let us try to understand why transmission of electricity requires a high-voltage transmission system. This is essential before discussing the details of an electrical transmission system, Requirement of Electrical Transmission System All the generating stations generate electric power at a low voltage level. Because generating electrical power at a low voltage level is economical. Actually, … Read more
We mostly use self-supported towers for electrical EHV power transmission. A self-supported tower differs from other types because of its construction features. This tower does not require any stay wire or guy wire to keep it stable in the vertical direction. We generally use lattice-type towers made from galvanized iron (GI) angles of different sizes … Read more
Power Transmission Utilities use lattice-structured transmission towers for extra high voltage transmission lines and ultra-high voltage transmission lines, normally above 33 kV or including 33 kV lines. They use galvanized iron or GI angles with nuts and bolts to erect the electrical transmission towers. The height of these towers ranges from 20 to 40 meters, … Read more
ACSR means Aluminum Conductor Steel Reinforced. We mostly choose ACSR for high‐voltage overhead transmission lines. An ACSR consists mainly of two parts. It has multiple layers of pure aluminum strands for carrying current. The purity of aluminum is 99.5%. It also has a central core of galvanized steel. This core provides tensile strength to the … Read more
Power Transmission Challenges The main drawback of conventional ACSR (Aluminum Conductor Steel Reinforced) conductors is their limited thermal capacity. These conductors are typically designed to operate at a maximum temperature of 75°C. Although some modern variants can withstand up to 85°C, exceeding these temperature limits by increasing current leads to higher thermal expansion, which in … Read more
TACSR TACSR is the simplest form of HTLS variants. It uses galvanized steel strands as reinforcement, similar to a simple ACSR conductor. However, it mainly differs in the current-carrying part of the conductor. Constructionally, a TACSR is similar to an ACSR conductor. It uses thermal-resistant aluminium alloy strands instead of normal hard-drawn pure aluminium. It … Read more
The electricity demand is increasing day by day. On the other hand, the land available for constructing new transmission lines is reducing continuously. Due to growing legal complexities, identifying or surveying a suitable transmission corridor has become a significant challenge. Therefore, the only practical solution available is to transmit more power through the existing transmission … Read more
TACSR stands for “Thermal Resistant Aluminium Alloy Conductor Steel Reinforced”. It is a type of HTLS conductor. TACSR can carry higher current than conventional ACSR conductors. This is because its operating temperature is much higher than that of ACSR. However, it maintains similar mechanical practices with higher ampacity. Power utilities use TACSR mainly for uprating … Read more
The electricity demand increasing tremendously from last few decades. The increasing demand of lands and few government policies are the constraints in expanding transmission infrastructure. Hence there is no way other than increasing the ampacity of the existing transmission networks. This increases the need for High-Temperature Low-Sag (HTLS) conductors. Among the various HTLS conductors, INVAR … Read more
A Gap-type HTLS conductor is a special type HTLS conductor. It exhibits a separate high strength low elongation steel core surrounded by layers of thermal resistant aluminum alloy strands. The typicality of a gap type HTLS conductor is, it maintains a deliberate annular gap between the core and the first layer of aluminum alloy strands. … Read more