GENERAL
10
NA10 - Manual - 04 - 2022
2 GENERAL2 GENERAL
Preface
The relay type NA10 can be used in radial networks as feeder or power transformer protection.
In solidly grounded systems the residual overcurrent protection can be used on feeders of any
length, while in ungrounded or Petersen coil and/or resistance grounded systems, the residual over-
current protection can be used on feeders of small length in order to avoid unwanted trippings due
to the capacitive current contribution of the feeder on external ground fault.
Following input circuits are available:
• Three phase current and one residual current inputs with nominal currents independently select-
able at 1 A or 5 A using DIP-switch.
• Two or five binary inputs.
• One block input (logic selectivity).
In addition to the main protection element, the breaker failure (BF), CT monitoring (74CT), Program-
mable logic controller (PLC) and Trip Circuit Supervision (TCS) are also provided.
Setting, programming and reading operations must be effected by means of Personal Computer with
ThyVisor software or by means of remote communication interface (RS485 bus, Ethernet network
and USB); all operations must be performed through MMI.
According to the hardware configurations, the NA10 protection relay can be shipped in various case
styles depending on the required mounting options:
• Flush.
• Projecting mounting.
• Rack.
• With separate operator panel.
Other options are:
• Auxiliary power supply operating range.
• Communication protocols.
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