ABB Relion 670 series - Secure FTP Access with TLS;FTPS; Encryption Algorithms for Secure Communication

Voltage-restrained overcurrent protection for generator and
step-up transformer.................................................................... 565
Overcurrent protection with undervoltage seal-in....................... 565
Section 10 Voltage protection............................................................. 567
Two step undervoltage protection UV2PTUV (27)................................567
Identification.................................................................................... 567
Application....................................................................................... 567
Setting guidelines............................................................................ 568
Equipment protection, such as for motors and generators.........568
Disconnected equipment detection............................................ 568
Power supply quality ..................................................................568
Voltage instability mitigation....................................................... 568
Backup protection for power system faults.................................569
Settings for two step undervoltage protection............................ 569
Two step overvoltage protection OV2PTOV (59)................................. 570
Identification.................................................................................... 571
Application....................................................................................... 571
Setting guidelines............................................................................ 572
Equipment protection, such as for motors, generators,
reactors and transformers.......................................................... 572
Equipment protection, capacitors............................................... 572
Power supply quality...................................................................572
High impedance grounded systems........................................... 573
The following settings can be done for the two step
overvoltage protection................................................................ 573
Two step residual overvoltage protection ROV2PTOV (59N)...............575
Identification.................................................................................... 575
Application....................................................................................... 575
Setting guidelines............................................................................ 576
Equipment protection, such as for motors, generators,
reactors and transformersEquipment protection
for transformers.......................................................................... 576
Equipment protection, capacitors............................................... 576
Power supply quality...................................................................576
High impedance grounded systems........................................... 577
Direct grounded system..............................................................577
Settings for two step residual overvoltage protection................. 578
Overexcitation protection OEXPVPH (24)............................................ 580
Identification.................................................................................... 580
Application....................................................................................... 580
Table of contents
12 Line distance protection REL670 2.2 ANSI
Application manual