METREL EurotestXC MI 3152 Instruction Manual page 113

MI 3152(H) EurotestXC (2,5 kV)
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
test, see Figure 7.33.

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
where:
U ......... Nominal U
n
L-PE
k ........ Correction factor (Isc factor) for I
sc
information.
Table 7.3: Relationship between Input voltage – U
is calculated from measured impedance as follows:
PSC
I
PSC
voltage (see table below),
PSC
Input voltage range (L-PE)
U
n
110 V (93 V  U
230 V (185 V  U
calculation

U k

N SC
Z
. Refer to chapter 4.6.5 Settings for more
 134 V)
L-PE
 266 V)
L-PE
and nominal voltage – U
L-PE
112
Tests and measurements
used for
n