NM20

Motor protection

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
Modbus protocol RTU RS485 / IEC 870-5-103 / DNP3
IEC61850 Ed.1 & Ed. 2

DOWNLOADS

Flyer NM20

Coding Sheet NM20

PRO-N NM20 IEC 61850 Certificate

NM20 Manual