Ht-instruments MACROTEST G3 Manuel d'utilisateur télécharger pdf (Page 100)

MACROTESTG3 - COMBIG3

EN - 99

CAUTION

The instrument must be used to measure fault loop impedance values at

least 10 times higher than the resolution value of the instrument in order to

minimize errors.

Depending on the set values of nominal 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 depends on:

 Protection type (curve)

 Rated current of the protection device

 Time of fault extinction by the 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

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Ht-instruments MACROTEST G3 Manuel d'utilisateur Page 100