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Application
The relay type NA10 is typically used in radial HV, MV
and LV networks as feeder or power transformer
protection.
In solidly grounded systems the residual overcurrent
protection can be used on feeders of any lenght, while
in ungrounded or Petersen coil and/or resistance
grounded systems, the residual overcurrent protection
can be used on feeders of small lenght in order to
avoid unwanted trippings due to the capacitive current
contribution of the feeder on external ground fault.
The relay complies with ENEL DK5600 requirements.
Protective
functions
50/51 - Phase overcurrent
50N/51N - Earth fault
BF - Circuit breaker failure |
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