MI 3101 EurotestAT: Appendix G
ES1 – application of regulative UNE-202008
133
Line to neutral
Line to line
Figure G.13: Examples of line impedance measurement result
Displayed results:
Z ..............Line impedance,
I
SC
............Prospective short-circuit current,
R..............Resistive part of line impedance,
Xl .............Reactive part of line impedance.
Prospective short circuit current is calculated as follows:
Z
k
Un
I
SC
SC
where:
Un ........Nominal L-N or L1-L2 voltage (see table below),
ksc .......Correction factor for Isc (see chapter
4.4.2
).
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-L
485 V)
Note:
High fluctuations of mains voltage can influence the measurement results. The
noise sign
is displayed in the message field in this case. Repeat the
measurement.
Isc is not calculated in case the terminal voltage monitor does not detect voltage
state that corresponds to the selected supply system, indication
.
