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2 G E N E R A L
2 G E N E R A L
Preface
The relay type NA016 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 overcurrent
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.
The NA016 protection relay may be shipped with traditional CTs or low power (LPCT) current inputs.
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 (CT inputs) or 50...1250 primary amperes (LPCT inputs).
• Three binary inputs.
In addition to the main protection element, the Trip Circuit Supervision (TCS) is 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); all operations must
be performed through MMI.
The NA016 hardware case is suitable for flash and rack mounting
Other options are:
• Auxiliary power supply operating range.
• Communication protocols (Modbus or IEC60870-5-103).