METREL EurotestXD MI 3155, Инструкция по эксплуатации, Страница: 129 / 242

MI 3155 Eurotest XD Test and measurements
128
Figure 7.45: Example of Z loop 4W 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 Un
I
SC
PSC


where:
Un ......... Nominal U
L-PE
voltage (see table below),
ksc ........ Correction factor (Isc factor) for I
PSC
. Refer to chapter 4.6.8 Settings for more
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 7.5: Relationship between Input voltage
– U
L-PE
and nominal voltage
– U
n
used for
calculation