3-phase transmission line with grounding - QuickField simulation example
This is an example of the 3-phase transmission line with grounding simulation, performed with QuickField software.
How to calculate conductor currents in a grounded three-phase transmission line?
Answer Typical applications Geometry
Given
Task
Solution
Result
Engineering question
Use equal-magnitude three-phase voltage sources with 0, 120, and 240 degree phase shifts in the AC magnetics model.
overhead transmission lines, HV transmission corridors, transmission line grounding systems
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Simulation problem
Problem Type
Plane-parallel problem of AC magnetics.
Line length L = 4 km.
Copper conductor diameter d = 1 mm, conductivity of copper g = 56 MS/m.
Voltage U = 400 V (peak), frequency 50 Hz.
Resistances R_A = 2 Ohm, R_B = 2.5 Ohm, R_C = 1 Ohm;
Inductance L = 0.002 H.
Ground resistance 8 Ohm.
Calculate currents in transmission line conductors.
For three phase system of voltage sources we should specify the same magnitude of the voltage source, but different phase shifts: 0°, 120°, 240°.
Currents: phase A 136A∠-26.8°, phase B 102A∠90.5°, phase C 132A∠-162°.
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