METREL MI 3122 Instruction Manual page 58

MI 3122 Smartec Z Line-Loop / RCD
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
where:
Un Nominal U
L-PE
scalling_factor ...... Correction factor for Isc (set to 1.00).
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
Figure 5.13: Examples of line impedance measurement result
Displayed results:
is calculated from measured impedance as follows:
PFC

I
PFC
Z

L PE
voltage (see table below),
U Input voltage range (L-PE)
n
110 V (93 V  U
230 V (185 V  U
Appendix C – Country notes
U
N

scaling _ factor
 134 V)
L-PE
 266 V)
L-PE
Line to line
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