GENERAL
11
NVA100X-D - Manual - 02 - 2016
2 GENERAL
Preface
The relay can be typically used in radial or meshed MV and LV networks as differential protection of
power generator/motor or transformer.
The phase and amplitude adaptation of the current for differential protection can be achieved can be
done either either by internal compensation or through external adapters.
Following input circuits are available:
Three phase current side H and three phase current side L with rated currents independently se-
lectable at 1 A or 5 A by means of sw settings
Two residual current side 1 and side 2 with rated currents independently selectable at 1 A or 5 A
by means of sw settings
Three phase voltages (line-to-ground) with rated voltages programmable in the range 50...130 V
(U
R
=100V) or 200...520 V (U
R
= 400V) and one residual voltage input with nominal voltage program-
mable in the range 50...130 V (U
ER
=100V)
In addition to the main protection element, the breaker failure (BF), CT monitoring (74CT), VT monitor-
ing (74VT)and Trip Circuit Supervision (TCS), are also provided.
Setting, programming and reading operations must be effected by means of Personal Computer with
ThySetter software or by means of remote communication interface (RS485 bus and Ethernet net-
work); all operations must be performed through MMI.
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