MI 3321 MultiservicerXA
All tests operating mode
168
Examples of line impedance measurement results
Displayed results:
Main result ............. Line impedance,
I
SC
.......................... Prospective fault current,
Ul-n ........................ Voltage UL-N
Prospective short circuit current I
SC
is calculated from measured impedance as follows:
Z
k
Un
I
SC
SC
where:
Un
Nominal U
L-PE
voltage (see table below),
U
n
Input voltage range (L-N or L1-L2)
110 V
(93 V
U
L-N
134 V)
230 V
(185 V
U
L-N
266 V)
400 V
(321 V
U
L-N
485 V)
Note:
High fluctuations of mains voltage can influence the measurement results field. In
this case it is recommended to repeat few measurements to check if the readings
are stable.
11.1.15.1 Low line impedance
The measurement is performed with Impedance adapter A1143. It is recognized in Z-
LINE and Z-LOOP functions. With this adapter, low impedances from few m
and up to
19.99
can be measured. The measurement is covered by requirements of the EN
61557-3 standard.
Impedance adapter connected
