Substation busbars eddies. Rod vs. Pipe - QuickField simulation example
DC resistance and 60 Hz impedance of round solid and tubular substation busbars, showing the influence of skin effect on different conductor sections.
How to calculate busbar DC resistance and impedance at 60 Hz?
Answer Typical applications Geometry
Given
Task
Results
Current density distribution in a Rod at 0 Hz and 60 Hz:
Current density distribution in a Pipe at 0 Hz and 60 Hz:
Engineering question
Use Plane-parallel problem of AC Magnetics to calculate busbar DC resistance and impedance at 60 Hz.
substation busbars, rod-type busbars, tubular conductors
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Simulation problem
Problem Type
Plane-parallel problem of AC Magnetics.
Material of busbar - aluminum with electrical conductivity σ=30.1 MS/m
Frequency f = 0 Hz, 60 Hz.
Calculate busbar DC resistance and impedance at 60 Hz.
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
Video
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