Gx
Series
EN - 87
6.9.
Δ
V%: VOLTAGE DROP OF MAIN LINES
This feature allows to evaluating the percentage value of voltage drop between two points
of a main line in which a protection device is installed and comparing this value to possible
limit value 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 § 11.1). This could cause the tripping of possible
magnetothermal protections at lower tripping currents
For the calibration of test cables (see § 6.4.2) the instrument consider the
values just saved in the correspondent LOOP functions
Fig. 34: Connection of the instrument for L-N mode voltage drop measurement
Fig. 35: Connection of the instrument for L-L mode voltage drop measurement