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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.
FUNCTIONS
STANDARD PROTECTIVE & CONTROL ELEMENTS
Under Voltage - 27
Positive Sequence Undervoltage - 27V1
Under Current - 37
Loss of Field - 40
Maximum number of startings (Restart inhibition) - 66
Ground directional overcurrent - 67N
Overfrequency - 81O
Underfrequency - 81U
Breaker Failure - BF
CT Supervision - 74CT
VT Supervision - 74VT
Trip Circuit Supervision - 74TCS
Directional active underpower - 37P
Phase overcurrent side H and side L - 50/51
Maximum Residual Overcurrent - 50N/51N(1)
Minimum Power Factor - 55
Overvoltage - 59
Residual Overvoltage - 59N
Negative sequence overvoltage - 59V2
Sequence of event Recorder (SER)
Sequence of Fault Recorder (SFR)
SW PACK OPTIONAL CONFIGURATION
Digital Fault Recorder (DFR)
HW PACK OPTIONAL CONFIGURATION
Thermal with Pt100 Probes - 26
COMMUNICATION FUNCTIONS
Modbus TCP-IP
One USB Type B local port for communication with ThyVisor setup software
