14
GroundFlex™ Adapter Model 6474
An equivalent diagram of the components forming this circuit is as follows:
Point of injection
of the current
Overhead
earth wire
L
L
L
R
pylon
Next pylon
to the left
Pylon
measured
Next pylon
to the right
A measurement in sweep mode (SWEEP) of an installation like this having 10
pylons gives the following results assuming an earth resistance R
pylon
of 10
Ω
for
each pylon and an inductance L of 550 µH for the link via the overhead earth wire
at the tip of the pylons:
Impedance of the pylons
0
2
4
6
8
10
12
14
16
0
1000
2000
3000
4000
5000
F (Hz)
Z (ohm)
Measurement of a pylon earth impedance with GroundFlex
™
sensors
Conventional 4 pole measurement
Measurement into the top of a pylon (iterative network impedance)
