MI 3122 Smartec Z Line-Loop / RCD
Appendix C – Country notes
58
Modifications of the chapter 5.2
Modified test parameters for fault loop impedance measurement
Fuse type
Selection of
fuse
type
[---, FUSE, B, C, D]
Lim
High limit fault loop impedance value
for selected fuse.
See Appendix A.3 for reference fuse data.
Figure 5.10:
Examples of loop impedance measurement result
Displayed results:
Z
fault loop impedance
Isc
........... prospective fault current,
Lim
.......... high limit fault loop impedance value.
Prospective fault current I
PFC
is calculated from measured impedance as follows:
factor
scaling
Z
U
I
PE
L
N
PFC
_
where:
Un Nominal
U
L-PE
voltage (see table below),
scalling_factor ...... Correction factor for Isc (set to 1.00).
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)
Modifications of the chapter 5.3
Modified test parameters for line impedance measurement
Fuse type
Selection of
fuse
type
[---, FUSE, B, C, D]
Lim
High limit line impedance value
for selected fuse.
See Appendix A.3 for reference fuse data.
Line to neutral
Line to line
Figure 5.13:
Examples of line impedance measurement result
Displayed results:
