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MI 3100 s, MI 3100 SE EurotestEASI Measurements
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5.6.1 Line impedance and prospective short circuit current
Circuits for measurement of line impedance
Figure 5.28: Phase-neutral or phase-phase line impedance measurement – connection of plug
commander and 3-wire test lead
Line impedance measurement procedure
Select the Zline function using the function selector switch.
Set sub-function to Zline using UP / DOWN keys.
Select test parameters (optional).
Connect test cable to the instrument.
Connect test leads to the item to be tested (see Figure 5.28).
Press the TEST key to perform the measurement.
Store the result by pressing the MEM key (MI 3100 SE only).
Figure 5.29: Examples of line impedance measurement result
Displayed results:
Z ............... line impedance
Isc ............ prospective short-circuit current
Lim ........... low limit prospective short-circuit current value
Prospective short circuit current is calculated as follows:
Z
kUn
ISC
SC
where:
Un ......... Nominal L-N or L1-L2 voltage (see table below),
ksc ........ Correction factor for Isc (see chapter 4.3.5 Isc factor).
Un Input voltage range (L-N or L1-L2)
110 V (93 V UL-N 134 V)
230 V (185 V UL-N 266 V)
400 V (321 V UL-L 485 V)
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