COMBI521
EN - 84
6.10.
V%: VOLTAGE DROP OF MAINS
This feature allows evaluating the percentage value of voltage drop between two points of
mains in which a protection device is installed and comparing this value to possible limit
values specified by guidelines. The following modes are available:
L-N
Measurement of Phase to Neutral line impedance. The test can be performed
also with high resolution (0.1m
) with optional accessory IMP57
L-L
Measurement of Phase to Phase line impedance. The test can be performed
also with high resolution (0.1m
) with optional accessory IMP57
CAUTION
The measurement of line impedance or fault loop impedance involves the
circulation of a maximum current according to the technical specifications of
the instrument (see § 10.1). This could cause the tripping of possible
magnetothermal or differential protections at lower tripping currents.
Fig. 36: Connection of the instrument for L-N mode voltage drop measurement
Fig. 37: Connection of the instrument for L-L mode voltage drop measurement
Содержание COMBI521
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