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Application
The relay type NA50 can be typically used in radial or meshed MV and LV networks as feeder or power transformer protection:
- on radial, ring and parallel feeders of any length in solidly grounded, ungrounded, Petersen coil and/or resistance grounded systems,
- on parallel connected generators on the same busbar.

Protective functions
49 - Thermal image
50/51 - Phase overcurrent
50N/51N - Residual overcurrent
59N - Residual overvoltage
67 - Directional overcurrent
67N - Directional ground fault
BF - Circuit breaker failure

 

 

 

 
   

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