METREL EurotestCOMBO MI 3125 User Manual

MI 3125 / BT EurotestCOMBO Measurements
47
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
* model MI 3125 BT
 Select the Z-LINE sub-function.
 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 (optional)*.
Line to neutral
Line to line
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
I
SC
SC


where:
Un ........ Nominal L-N or L1-L2 voltage (see table below),
ksc ....... Correction factor for Isc (see chapter 4.2.5).

METREL EurotestCOMBO MI 3125 Specifications

General

Brand	METREL
Model	EurotestCOMBO MI 3125
Category	Measuring Instruments
Language	English