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Application
The relay type NA30 is typically used in radial MV
networks as feeder or power transformer protection:
- on long radial feeders in ungrounded or Petersen
coil and/or high resistance grounded systems,
- on the LV side of parallel connected transformers
with any grounding,
- as earth fault protection of parallel connected
generators or generator-transformer unit on the same
busbar.
The relay complies with ENEL DK5600 requirements.
Protective
functions
49 - Thermal image
50/51 - Phase overcurrent
50N/51N - Residual overcurrent
59N - Residual overvoltage
67N - Directional ground fault
BF - Circuit breaker failure |
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