Fluke 1625 FE 1625 Users Manual - Page 48

ER ER ER ER ER, Measuring the Earthing Resistance without Disengaging

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1625 Users Manual Accordingly, these equivalent resistances are displayed as: REi = U meas li Therefore the earthing resistance RE of the pylon is determined as a parallel circuit of the individual equivalent resistances: RE = 1 + 1 1 + 1 + 1 RE1 R E2 RE3 RE4 START TEST 1625 EARTH / GROUND TESTER H /C2 DISPLAY MENU Earth/Ground Resistance 300 k RA CHANGE ITEM 4 POLE 3 POLE 4 POLE 3 POLE AC Resistance 300 k R DC Low Resistance 3k R 2 POLE 2 POLE 4 POLE SELECT OFF S/P2 ES/P1 E /C1 4 Pole Probe Auxiliary earth electrode >20 m >20 m edw016.eps Figure 13. Measuring the Earthing Resistance without Disengaging the Overhead Earth Wire 1. Turn central rotary switch to position "ARE 3pole" or ARE 4pole". The instrument is to be wired according to picture and notices given on the display. A flashing of the sockets symbols EFGH or B, points to an incorrect or incomplete connection of the measuring lead. 2. Apply current transformer to the pylon stub. Make sure that the transformation ratio set on the instrument corresponds to the current transformer used. Change settings if necessary (see "Changing of All Data Settings with Personalised CODE") 40

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1625
Users Manual
40
Accordingly, these equivalent resistances are displayed as:
li
U
R
meas
Ei
=
Therefore the earthing resistance R
E
of the pylon is determined as a parallel
circuit of the individual equivalent resistances:
4
3
2
1
1
1
1
1
1
E
E
E
E
E
R
R
R
R
R
+
+
+
=
R
RA
R
Earth/Ground Resistance 300k
AC
Resistance
300k
DC Low Resistance 3k
CHANGE
ITEM
SELECT
START
TEST
DISPLAY
MENU
H/C2
S/P2
ES/P1
E/C1
4
POLE
3
POLE
4
POLE
2
POLE
2
POLE
4
POLE
OFF
3
POLE
EARTH / GROUND TESTER
1625
Auxiliary
earth
electrode
Probe
4 Pole
>20 m
>20 m
edw016.eps
Figure 13. Measuring the Earthing Resistance without Disengaging the
Overhead Earth Wire
1.
Turn central rotary switch to position “
A
R
E
3pole" or
A
R
E
4pole". The instrument is to be wired according to picture and notices
given on the display.
A flashing of the sockets symbols
EFGH
or
B
, points to an
incorrect or incomplete connection of the measuring lead.
2.
Apply current transformer to the pylon stub. Make sure that the trans-
formation ratio set on the instrument corresponds to the current trans-
former used. Change settings if necessary (see “Changing of All Data
Settings with Personalised CODE”)