Substation busbars eddies. Rod vs. Pipe
QuickField simulation example
Effect of power frequency and skin effect on current carrying rods, pipes and channel.
Problem Type
Plane-parallel problem of AC Magnetics.
Geometry
Given
Material of busbar - aluminum with electrical conductivity σ=30.1 MS/m
Frequency f = 0 Hz, 60 Hz.
Task
Calculate busbar DC resistance and impedance at 60 Hz.
Results
Taking the conductance and the weight per foot into account you can calculate that the pipe carries the same current as the round bar with only (2.25/6.48)*(192/199)=33.5% of the weight.
| Busbar | Cross-section area, in² | Resistance, μOhm/m | Impedance, μOhm/m |
|---|---|---|---|
| Rod 2-5/8" | 6.48 | 8 | 199 |
| 2.5" Schedule 80 Pipe | 2.25 | 23 | 192 |
Current density distribution in a Rod at 0 Hz and 60 Hz:
Current density distribution in a Pipe at 0 Hz and 60 Hz:
- Video: Effect of power frequency and skin effect on current carrying rods, pipes and channel
- Download simulation files (files may be viewed using any QuickField Edition).