ABB RELION RET670 - Page 20

High impedance grounded systems........................................... 619
The following settings can be done for the two step
overvoltage protection
................................................................ 619
Two step residual overvoltage protection ROV2PTOV
(59N)...............621
Identification.................................................................................... 621
Application....................................................................................... 621
Setting guidelines............................................................................ 622
Equipment protection, such as for motors, generators,
reactors and transformersEquipment protection
for transformers.......................................................................... 622
Equipment protection, capacitors............................................... 622
Power supply quality...................................................................623
High impedance grounded systems........................................... 623
Direct grounded system..............................................................624
Settings for two step residual overvoltage protection................. 624
Overexcitation protection OEXPVPH (24)............................................ 626
Identification.................................................................................... 626
Application....................................................................................... 626
Setting guidelines............................................................................ 629
Recommendations for input and output signals......................... 629
Settings.......................................................................................629
Service value report....................................................................630
Setting example..........................................................................631
Voltage differential protection VDCPTOV (60)..................................... 632
Identification.................................................................................... 632
Application....................................................................................... 633
Setting guidelines............................................................................ 634
Loss of voltage check LOVPTUV (27).................................................. 636
Identification.................................................................................... 636
Application....................................................................................... 636
Setting guidelines............................................................................ 636
Advanced users settings............................................................ 636
Section 11 Frequency protection.........................................................637
Underfrequency protection SAPTUF (81).............................................637
Identification.................................................................................... 637
Application....................................................................................... 637
Setting guidelines............................................................................ 638
Overfrequency protection SAPTOF (81)...............................................638
Identification.................................................................................... 639
Application....................................................................................... 639
Table of contents
14 Transformer protection RET670 2.2 ANSI
Application manual