- Industrial Instrumentation
- Manuals Requests:
- DNA Testing
- What is Electrical Engineering?
- How Satellite TV Works?
- Website Hosting?
- What is cord blood?
- What is Data Recovery?
- Online Engineering Education
- General Electric Turbine
- Nature Photos
- Electrical Glossary
- Electrical Engineering Overview
- Electrical Courses and Lectures
- Fundamental of Electricity 1
- Fundamentals Of Electricity 2
- Fundamentals Of Electricity 3
- Electrical Distribution Equipments Part A
- Electrical Distribution Equipments Part B
- Electric Motors Course
Friday, June 29, 2012
A 330kV Overhead Transmission Line.
Overhead lines are suspended from strings of insulators which are in turn supported by, in this case, steel towers. The surrounding air acts as an insulating medium (at atmospheric pressure, air breaks down at 3kV/mm). Each phase in this line consists of a bundle of two conductors. The conductors are of type ACSR (see below). Bundles of conductors are used instead of a single conductor to reduce the effects of corona, the partial ionisation of the air close to the conductor surface. Bundling also reduces the inductive reactance of the line. For protection against lightning, ground wires (also called shield wires) are fitted above the phase conductors and are electrically connected to the towers and via the towers to ground.