Loop Resistance (R Loop )/Earthing/Grounding Voltage - LEM SATURN 100 plus Manuel D'utilisation

Measuring

3.9 Loop Resistance (R LOOP )/Earthing/Grounding Voltage

The measuring mode „R " serves to check the protective measures „Zeroing"
LOOP
and „Earth/Ground-Connection", in TN and TT networks, under DIN VDE 0100 and
ÖVE-EN1. This permits rapid measurement of the loop resistance between L and
PE and the internal mains resistance between L and N up to 200 Ohm in networks
from 101 to 435 V. These measurements can also be effected between 2 phases
(e.g. L1, L2). In addition it is possible to display the short-circuit current I
current nominal voltage to which I refers. The correct polarity with respect to the
K
mains is automatically set by the instrument if L and N have been exchanged.
For measuring the earthing/grounding voltage (U
probe if the measured short-circuit current flows, a probe may be connected.
Measuring Process
R R
B A
Probe
Marker
> 20m
Instrument
Connection for use with a Probe
R
LOOP
Observe overload capacity and connect instrument as shown.
Turn central selector in mode R
LOOP
or L-PE for loop Resistance. When using the 3-pole measuring lead, this switching
may only be used if all 3 cables are wired correctly! Now the mains voltage is
displayed dependent on the switch position L-N or L-PE (see also section 3.6).
Press key „Start".
R
Press key „Start".
Read measured value.
S
After pressing key „Display", the pertinent short-circuit current (I
another press yields the nominal voltage (U
earthing/grounding voltage „U ".
S-PE
For another measurement press key „Start" again.
and the
K
), the voltage between PE and
S-PE
L 1
L 2
L 3
L2
L2
N
P E (PEN)
L3
L1
M
L1
L 1 = brown
L 2 = black
L3
L 3 = purple
Instrument
Instrument
to desired position L-N for internal resistance
) is displayed;
K
) and in case of use of a sonde, the
N
33