Fluke 1625 FE 1625 Users Manual - Page 44

Measurement of Single Earth Electrode Resistances in Mesh Operated Earthing Systems Using Selective Clamp Method

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1625 Users Manual Measurement of Single Earth Electrode Resistances in Mesh Operated Earthing Systems Using Selective Clamp Method This measuring method has been created to measure single earth electrodes in permanently wired or mesh operated systems (e.g. lightning protection system with several electrodes or high voltage pylons with earth cabling etc.). By measuring the actual current flow through the earth electrode, this special measuring method provides the unique possibility to measure selectively only this particular resistance by means of a clip-on transformer (accessory). Other parallel resistances applied are not taken into account and do not distort the measuring result. A disconnection of the earth electrode before the measurement is therefore no longer necessary. G I IZ tr A I3 V U meas. Probe Aux. Earth Electrode RE1 RE2 RE3 RS RH RE3 = Umeas. I3 = Umeas. tr . IZ edw014.eps Figure 11. Measurement of Single Earth Electrode Resistances in Mesh Operated Earthing Systems 36

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1625
Users Manual
36
Measurement of Single Earth Electrode Resistances in
Mesh Operated Earthing Systems Using Selective
Clamp Method
This measuring method has been created to measure single earth electrodes in
permanently wired or mesh operated systems (e.g. lightning protection system
with several electrodes or high voltage pylons with earth cabling etc.). By
measuring the actual current flow through the earth electrode, this special
measuring method provides the unique possibility to measure selectively only
this particular resistance by means of a clip-on transformer (accessory). Other
parallel resistances applied are not taken into account and do not distort the
measuring result.
A disconnection of the earth electrode before the measurement is therefore no
longer necessary.
G
I
I
Z
tr
V
A
Aux. Earth
Electrode
Probe
I
3
U
meas.
R
E
1
R
E
2
R
E
3
R
S
R
H
R
E
3
=
U
meas.
I
3
=
U
meas.
tr
.I
Z
edw014.eps
Figure 11. Measurement of Single Earth Electrode Resistances in Mesh
Operated Earthing Systems