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Explore power transmission — components, line design, conductors, and techniques for efficient high-voltage energy transfer over long distances.
Insulators Used in Overhead Transmission Lines In overhead transmission lines, insulators support the conductor on metallic tower structures. At the same time, they electrically isolate the high-voltage conductor from the metallic body of the supporting towers. In high-voltage overhead transmission lines, engineers typically install insulator strings at the tip of the cross arms of towers. … Read more
Before we discuss the use of disc insulators in high-voltage transmission lines, let’s understand the need for such insulators. Transmission lines operate at very high voltages such as 66 kV, 132 kV, 220kV, 400 kV, even 765 kV and more. So, the conductors used in these systems are also very heavy. To maintain proper ground clearance, we suspend these … Read more
Engineers prefer to use silicone rubber composite insulators for transmission lines in areas with high pollution levels. In other words, these areas are among the most heavily polluted. These insulators normally have a creepage distance of 31 mm/ kV. The disc insulators used in heavily polluted areas also have a creepage distance of 31 mm/kV. … Read more
Power stations generate electric power. Electrical power transmission lines transmit the generated power to far places. The resistance and reactance of the line cause a voltage drop in the power. The Voltage Regulation of Transmission Line is the change in voltage between the sending and receiving ends. What is Voltage Regulation? We express the Voltage … Read more
Skin effect is a phenomenon that occurs in conductors. It mainly occurs while a conductor carries alternating current. Actually, an alternating current always tries to flow through the outer layer of a conductor. As a result, the current distribution across the cross-section of the conductor becomes uneven. Alternating current flows through the conductor at 50 … Read more
The corona effect is a natural electrical phenomenon. It occurs on EHV and UHV transmission lines. It may also occur inside substations on the live parts of high-voltage equipment. Cause of the Corona Effect The voltage level of transmission lines and live equipment is very high in EHV systems. Therefore, the electric field intensity surrounding … Read more
Before entering the topic of line differential protection, or simply differential protection of a transmission line, we shall first recall our concept of differential protection. Actually, the differential protection used for a transmission line is called line differential protection. We have already heard about the differential protection of transformers, busbars, etc. The same principle is … Read more
A Digital Teleprotection Coupler (DTPC) is often referred as a Digital Protection Coupler (DPC). It serves as a high-speed, reliable interface for transmitting protection commands between substations over a communication medium (OPGW). Typically it is used for carrier protection of transmission lines. Working Principle First, a protective relay such as a digital distance relay or … Read more
Type Tests as per IS 398 Part-5 Routine Tests on ACSR Conductors These tests are performed as per IS 398 Part-5 Acceptance Tests on ACSR Conductors as per IS 398 Part-5
Type Tests on GSS Earth Wire All the type tests are performed on a single strand of sampled length. Routine Tests GSS Earth Wire Acceptance Tests of GSS Earth Wire