QuickField

A new approach to field modelling

Main >> >> Transmission line capacitance

Three phase overhead transmission line capacitance

QuickField simulation example

Three phase overhead transmission line capacitance

Problem Type
Plane-parallel problem of electrostatics.

Geometry
Model length Lz = 1 km. Conductor diameter 1 cm.
Transmission line capacitance Three phase transmission line above earth A B C Ground h = 5 m d = 1m CA-A CA-C

Given
Phase voltage 6.3 kV.
Ground electric potential zero volt.

Solution
Transmission line of 3 conductors features self- and mutual- partial capacitances. It is convenient to use capacitance matrix calculator add-in to find all the partial capacitances.

Results
Electric field distribution around the transmission line.
transmission line capacitance matrix

Transmission line capacitance matrix
Capacitance, nF/km Phase A Phase B Phase C
Phase A 4.27 1.69 1.64
Phase B 1.69 4.10 1.70
Phase C 1.64 1.70 4.28