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.
Specifications
Key: standard optional alternative
Applications • Motor Protection functions • Pt100 thermometric probes (26) • Undervoltage (27) • Positive seq. undervoltage (27V1) • Reverse active overpower (32R) • Phase undercurrent (37) • Directional active underpower (37P) • Loss of field (40) • Negative sequence overcurrent (46) • Phase reversal (47) • Thermal image (49) • Phase overcurrent (50/51) • Residual overcurrent (50N/51N) • Locked rotor (51LR(48)/14) • Minimum power factor (55) • Overvoltage (59) • Residual overvoltage (59N) • Negative seq. overvoltage (59V2) • Maximum number of starting (66) • Ground directional overcurrent (67N) • Underfrequency & overfrequency (81U 81O) • High impedance restricted earth fault (87NHIZ) • Breaker failure (BF) Monitoring and control functions • CB diagnostic • Cold Load Pickup (CLP) • CTs monitoring (74CT) • Digital Fault recording (DFR) • Fault and event logging (SER & SFR) • Logic selectivity • Multiple setting profiles • Programmable Logic Controller • Self-test • Trip circuit supervision (74TCS) • VTs monitoring (74VT) Hardware • 2 binary inputs + 6 output relays + 8 LEDs • Auxiliary power supply 110-230 Vac/dc • Auxiliary power supply 24-48 Vac/dc • Flush, projecting, projecting, rack, with separate MMI • Network module with Ethernet FX port (optical fiber) • Network module with Ethernet TX port (copper RJ45) + RS485 port • Nominal current 1/5 A selectable by DIP-switch • RS485 port (unavailable with Ethernet FX port) • Standard CT amperometric inputs 1/5 A Communication • IEC 61850 Protocol • Modbus RTU RS232 protocol • Modbus RTU RS485 / IEC 870-5-103 / DNP3 protocol • Modbus TCP/IP protocol (network board must be provided)
application MOTOR
ANSI protection Phase undercurrent (37)|Negative seq. overvoltage (59V2)|Loss of field (40)|Thermal image (49)|Phase overcurrent (50/51)|Underfrequency & overfrequency (81U 81O)|Ground directional overcurrent (67N)|Breaker failure (BF)|Maximum number of starting (66)|Overvoltage (59)|High impedance restricted earth fault (87NHIZ)|Phase reversal (47)|Directional active underpower (37P)|Negative sequence overcurrent (46)|Minimum power factor (55)|Residual overvoltage (59N)|Residual overcurrent (50N/51N)|Locked rotor (51LR(48)/14)|Undervoltage (27)|Pt100 thermometric probes (26)|Positive seq. undervoltage (27V1)|Reverse active overpower (32R)
