HT COMBITEST422, Руководство пользователя

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COMBITEST422
EN - 80
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. 33: Connection of the instrument for L-N mode voltage drop measurement
Fig. 34: Connection of the instrument for L-L mode voltage drop measurement
Kommenterede [S20]:
forse MAINS nel senso di rete elettrica?
Kommenterede [S21]:
idem come commentato sopra?