Mechanical Design of Transmission Lines
Subject and UNIT: Transmission and Distribution: Unit III: (a) Mechanical Design of Transmission Lines
The stranded conductor usually has a central wire which is surrounded by the layers of wires. These layers consists of 6, 12, 18, ...... wires successively. Thus the total strands are 7, 13, 19 ...... .
Effect of Ice Coating - Wind Pressure
Subject and UNIT: Transmission and Distribution: Unit III: (a) Mechanical Design of Transmission Lines
The expressions derived uptil now are true in still air and the normal temperature. In these derivations we have assumed that the conductor is acted by its weight only.
supports at Equal Level - Supports at Unequal Levels - Factor of Safety
Subject and UNIT: Transmission and Distribution: Unit III: (a) Mechanical Design of Transmission Lines
Let us see the method of calculation of sag and tension in an overhead transmission line. In practice there are two cases in which sag calculation differs. Such two practical cases are,
Important Points
Subject and UNIT: Transmission and Distribution: Unit III: (a) Mechanical Design of Transmission Lines
Sag : The difference in levels between point of support and the lowest point on the conductor is called sag.
Introduction
Subject and UNIT: Transmission and Distribution: Unit III: (a) Mechanical Design of Transmission Lines
The transmission lines are designed primarily from the economy point of view. To have lowest cost, length of the transmission line must be 7'.
Modelling and Performance of Transmission Lines
Subject and UNIT: Transmission and Distribution: Unit II: (b) Corona
Transmission and Distribution: Unit II: (b) Modelling and Performance of Transmission Lines : Two Marks Questions with Answers
Subject and UNIT: Transmission and Distribution: Unit II: (b) Corona
The various advantages of corona effect are,
Subject and UNIT: Transmission and Distribution: Unit II: (b) Corona
The corona discharge produces the radiations which may introduce noise signals in the communication lines, carrier signal, radio and television receivers, navigation signals etc.
Subject and UNIT: Transmission and Distribution: Unit II: (b) Corona
The various factors affecting corona and corona loss are,
Subject and UNIT: Transmission and Distribution: Unit II: (b) Corona
The corona has following effects,
Critical Disruptive Voltage - Critical Visual Disruptive Voltage - Corona Power Loss
Subject and UNIT: Transmission and Distribution: Unit II: (b) Corona
The various parameters related to corona effect are, i) Critical disruptive voltage, ii) Critical visual disruptive voltage and iii) Corona power loss
Transmission and Distribution
Subject and UNIT: Transmission and Distribution: Unit II: (b) Corona
It can be noticed that near the overhead lines there exists a hissing noise and sometimes a faint violet glow. The effect due to which such phenomenon exists surrounding the overhead lines, is called corona effect.