MI 3152(H)
Eurotest
XC (2,5 kV)
Tests and measurements
112
Measurement procedure
Enter the
Z loop
function.
Set test parameters / limits.
Connect test cable to the instrument.
Connect test leads or Plug commander to the object under
Start the measurement.
Save results (optional).
Figure 7.34:
Examples of Loop impedance measurement result
Measurement results / sub-results
Z
Loop impedance
Ipsc
Prospective fault current
Ulpe
Voltage L-PE
R
Resistance of loop impedance
XL
Reactance of loop impedance
Prospective fault current I
PSC
is calculated from measured impedance as follows:
Z
k
U
I
SC
N
PSC
where:
U
n
......... Nominal U
L-PE
voltage (see table below),
k
sc
........ Correction factor (Isc factor) for I
PSC
information.
U
n
Input voltage range (L-PE)
110 V (93 V
U
L-PE
134 V)
230 V (185 V
U
L-PE
266 V)
Table 7.3: Relationship between Input voltage
– U
L-PE
and nominal voltage
– U
n
used for
calculation
