Overhead
69 articles
Video: View and export profiles of overhead line models
Video: Scoping in Neara Designer
Video: Rapid project scoping for overhead powerline design
Selecting and interacting with overhead line model objects
Overview of using the Conductor toolCreate a new series of conductor spans, or extend and fine-tune an existing conductor span
View and set a conductor's properties
Extend an existing conductor
Specify a precise span length
Split conductors
Join conductors
Set individual cable tensions on a conductor span
Set derating strength factors on conductors, poles, and components
Video: Create multiple conductor groups
Create and attach mid-cable objects to spans
Set the Maximum Operating Temperature of a conductor
Create a double cross-armTo create a double cross-arm
Overview of crossarm parametersCrossarms have a number of parameters that can be configured to model any type of cross arm
Crossarm parameter: Material StrengthThe Material Strength is used in two places
Crossarm parameter: Max Bending Moment vs Horizontal/VerticalUsed by the Finite Element Analysis (FEA) engine
Crossarm parameter: Second Moment of Area
Crossarm parameter: Section Modulus
Crossarm parameter: Torsion ConstantThere is no exact formula to calculate the Torsion Constant of a rectangular object
Wind speed
M(z,cat) Gust Wind Speed MultiplierM(z,cat) is a multiplier applied to the regional wind speed to take into account the terrain category and the height above ground
Span Reduction Factor SRF and Tension Section Reduction Factor TSRFThe Span Reduction Factor (SRF) is a concept outlined in AS/NZ7000:2016
Wind and Weight SpansTheory - Wind Spans
Wind Speed - Australia / New ZealandFor the AS/NZS7000:2016 and AS/NZS1170.2 Standards
Pole Plant Calculation
Torsion ConstantThe Torsion Constant, also known as the Polar Moment of Inertia (or Second Polar
Tip Load Calculations
Stress / Strain
Stay Calculation
Span Clearance Calculations
Section ModulusThe section modulus takes account of the second moment of area corresponding the direction of bending (measure of the stiffness of an object against bending. It is a geometrical property…
Second Moment of Area
Sag Tension Calculation
Sag Measurement
Blowout Calculation
Neutral Axis
Moments of Area
Modulus of ElasticityAlso known as Young's Modulus
Maximum Bending Stress / Material StrengthAlso known as the material strength
Bending Moment CapacityThe Bending Moment Capacity is calculated using the Yeild Strength of the material.
General Conductor Properties and calculations
Example models from AS7000 HB 331-2012
Common Shapes: Second Moment of Area and Torsion Constant
Catenary Definition