Caution – HT instruments MACROTEST G3 User Manual
Page 72
MACROTESTG3 - COMBIG3
EN - 71
6.9.
ΔV%: 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 § 10.1). This could cause the tripping of possible
magnetothermal protections at lower tripping currents.
Fig. 32: Connection of the instrument for L-N mode voltage drop measurement
Fig. 33: Connection of the instrument for L-L mode voltage drop measurement