ABB RELION RET670 - Page 19

Negativ sequence time overcurrent protection for machines
NS2PTOC (46I2)..................................................................................
600
Identification
.................................................................................... 600
Application....................................................................................... 600
Features..................................................................................... 601
Generator continuous unbalance current capability................... 602
Setting guidelines............................................................................ 604
Operate time characteristic.........................................................604
Pickup sensitivity........................................................................ 605
Alarm function.............................................................................606
Voltage-restrained time overcurrent protection VRPVOC (51V)...........606
Identification.................................................................................... 606
Application....................................................................................... 606
Base quantities........................................................................... 607
Application possibilities...............................................................607
Undervoltage seal-in...................................................................607
Setting guidelines............................................................................ 608
Explanation of the setting parameters........................................ 608
Voltage-restrained overcurrent protection for generator and
step-up transformer.................................................................... 610
Overcurrent protection with undervoltage seal-in....................... 610
Section 10 Voltage protection............................................................. 613
Two step undervoltage protection UV2PTUV (27)................................613
Identification.................................................................................... 613
Application....................................................................................... 613
Setting guidelines............................................................................ 614
Equipment protection, such as for motors and generators.........614
Disconnected equipment detection............................................ 614
Power supply quality ..................................................................614
Voltage instability mitigation....................................................... 614
Backup protection for power system faults.................................615
Settings for two step undervoltage protection............................ 615
Two step overvoltage protection OV2PTOV (59)................................. 616
Identification.................................................................................... 617
Application....................................................................................... 617
Setting guidelines............................................................................ 618
Equipment protection, such as for motors, generators,
reactors and transformers.......................................................... 618
Equipment protection, capacitors............................................... 618
Power supply quality...................................................................619
Table of contents
Transformer protection RET670 2.2 ANSI 13
Application manual