Ht-instruments MACROTEST G3 Uživatelský manuál stáhnout pdf (Strana 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

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Ht-instruments MACROTEST G3 Uživatelský manuál Strana 72