Table of Contents
Advertisement
In the sweep mode, the measurements can be made at frequencies up to 5kHz.
On a single tower, frequencies in the order of 5kHz do not always entail inductive
effects, but the "current loops" formed by the adjacent towers and the return chan-
nel through the ground may result in inductances that can be detected only at high
frequencies.
An equivalent diagram of the components forming this circuit is as follows:
Point of injection
of the current
A measurement in sweep mode (SWEEP) of an installation like this having 10
towers gives the following results assuming an earth resistance R
each tower and an inductance L of 550µH for the link via the overhead ground
conductor at the tip of the towers:
Z (ohm)
16
14
12
10
8
6
4
2
0
0
Measurement of a tower earth impedance with GroundFlex
sensors
Conventional 4 pole measurement
Measurement into the top of a tower (iterative network impedance)
GroundFlex
Adapter Model 6474
®
Shop for AEMC products online at:
L
Next pylon
to the left
measured
Impedance of the towers
1000
2000
ShopAEMC
www.
L
R
pylon
Pylon
Next pylon
to the right
3000
.com
L
Overhead
earth wire
of 10Ω for
pylon
F (Hz)
4000
5000
®
1.877.766.5412
15
Advertisement
Table of Contents
