Ht-instruments MACROTEST G3 Instrukcja Użytkownika Pobierz pdf (Strona 96)

MACROTESTG3 - COMBIG3

EN - 95

Depending on the set values of phase-phase, phase-neutral or phase-PE voltage (see §

5.1.3) and the measured value of fault loop impedance, the instrument calculates the

minimum value of the assumed short-circuit current to be interrupted by the protection

device. For proper coordination, this value MUST always be greater than or equal to the Ia

value of the tripping current of the type of protection considered.

The Ia reference value (see Fig. 36) depends on:

 Protection type (curve)

 Rated current of the protection device

 Time of fault extinction by the protection

Fig. 36: Example of curves relative to magnetothermal (MCB) protection

The instrument allows the selection of the following parameters:

 MCB current (B curve) selectable among values:

6, 10, 13, 15, 16, 20, 25, 32, 40, 50, 63A

 MCB current (C, K curves) selectable among values:

0.5, 1, 1.6, 2, 4, 6, 10, 13, 15, 16, 20, 25, 32, 40, 50, 63A

 MCB current (D curve) selectable among values:

 0.5, 1, 1.6, 2, 4, 6, 10, 13, 15, 16, 20, 25, 32A

 Nominal current Fuse gG selectable among values: 2, 4, 6, 8, 10, 12, 13, 16, 20, 25, 32,

40, 50, 63, 80, 100, 125, 160, 200, 250, 315, 400, 500, 630, 800, 1000, 1250A

 Nominal current Fuse aM selectable among values: 2, 4, 6, 8, 10, 12, 16, 20, 25, 32, 40,

50, 63, 80, 100, 125, 160, 200, 250, 315, 400, 500, 630A

 Time of fault extinction by the protection selectable among: 0.1s, 0.2s, 0.4s, 5s

1 2 ... 91 92 93 94 95 96 97 98 99 100 101 ... 107 108

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Ht-instruments MACROTEST G3 Instrukcja Użytkownika Strona 96