Mechanical Design of Overhead Lines
INTRODUCTION
LINE SUPPORTS
Wooden Poles
RCC Poles
Steel Towers
Spacing
Where S = Sag in metres V = Line voltage in kV
SAG
Supports at Same Level
Except for lines with very long span and large sag.
Let l = Length of span, i.e., horizontal distance between supports, in metres
S = Sag at mid span, in metres
T = Conductor tension (Assumed constant over the whole span) in Newtons w = Conductor weight, N/m
Effect of Ice and Wind
The vertical sag is S cos g.
Supports at Different Levels
The curve BOCA is the complete parabola with A and B at the same level.
i.e., span is less than
Factors Affecting Sag
SAG TEMPLATE
23 videos|89 docs|42 tests
|
1. What are the key factors to consider in the mechanical design of overhead lines? |
2. How does conductor size affect the mechanical design of overhead lines? |
3. What is the significance of tension and sag in the mechanical design of overhead lines? |
4. How do environmental conditions affect the mechanical design of overhead lines? |
5. What are the clearance requirements for overhead lines in relation to surrounding objects? |
23 videos|89 docs|42 tests
|
|
Explore Courses for Electrical Engineering (EE) exam
|