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Intelligence-Embedded
Devices...
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Application
The relay type NM20 can be used for protection of large size
motors in MV systems.
For any grounded systems (solidly grounded, ungrounded or
Petersen coil and/or resistance grounded) the protection can
be used on feeders of any lenght.
Protective
functions
26 - Thermal probes
27 - Undervoltage
27V1 - Positive-sequence undervoltage
27V2 - Negative-sequence undervoltage
37 - Undercurrent
46 - Negative-sequence overcurrent
49 - Thermal image
50 - Phase overcurrent
51LR - Locked rotor
50N/51N - Residual overcurrent
59N - Residual overvoltage
66 - Restart inhibit
67N - Directional ground fault
BF - Circuit breaker failure
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