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
Sequence of Fault Recorder (SFR)
Sequence of event Recorder (SER)
Positive Sequence Undervoltage - 27V1
Phase overcurrent side H and side L - 50/51
Overfrequency - 81O
Underfrequency - 81U
Residual Overvoltage - 59N
VT Supervision - 74VT
Ground directional overcurrent - 67N
Overvoltage - 59
CT Supervision - 74CT
Under Voltage - 27
Directional active underpower - 37P
Maximum number of startings (Restart inhibition) - 66
Under Current - 37
Breaker Failure - BF
Negative sequence overvoltage - 59V2
Loss of Field - 40
Maximum Residual Overcurrent - 50N/51N(1)
Minimum Power Factor - 55
Trip Circuit Supervision - 74TCS
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
