Lumel ND20 - METER DESCRIPTION; Current and Voltage Inputs; Connection Diagrams

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5. METER DESCRIPTION
5.1 Current Inputs
All current inputs are galvanically isolated (internal current transfor-
mers). The meter is adapted to co-operate with external measuring cur-
rent transformers. Displayed current values and derivative quantities
are automatically recoun in relation to the introduced external current
transformer ratio. Current inputs are defined in the order as 1 A or 5 A.
5.2 Voltage Inputs
Quantities on voltage inputs are automatically converted acc. to the
introduced ratio of the external voltage transformer. Voltage inputs are
defined in the order as 3 x 57.7/100 V, 3 x 230/400 V.
5.3 Connection Diagrams
a)
Direct, semi-direct
and indirect
single-phase
measurement