ABB REQ650 - Page 11

Setting guidelines................................................................. 145
Directional underpower protection GUPPDUP.......................... 149
Identification......................................................................... 149
Setting guidelines................................................................. 149
Negative sequence based overcurrent function DNSPTOC ..........152
Identification.............................................................................. 152
Application.................................................................................152
Setting guidelines...................................................................... 152
Section 7 Voltage protection........................................................ 155
Two step undervoltage protection UV2PTUV ................................155
Identification.............................................................................. 155
Application.................................................................................155
Setting guidelines...................................................................... 156
Equipment protection, such as for motors and generators...156
Disconnected equipment detection...................................... 156
Power supply quality ........................................................... 156
Voltage instability mitigation................................................. 156
Backup protection for power system faults...........................156
Settings for Two step undervoltage protection..................... 157
Two step overvoltage protection OV2PTOV ..................................158
Identification.............................................................................. 158
Application.................................................................................158
Setting guidelines...................................................................... 159
Two step residual overvoltage protection ROV2PTOV ................. 161
Identification.............................................................................. 161
Application.................................................................................161
Setting guidelines...................................................................... 162
Power supply quality............................................................ 162
High impedance earthed systems........................................ 162
Direct earthed system.......................................................... 163
Settings for Two step residual overvoltage protection..........164
Loss of voltage check LOVPTUV .................................................. 165
Identification.............................................................................. 165
Application.................................................................................165
Setting guidelines...................................................................... 166
Advanced users settings........................................................... 166
Section 8 Frequency protection....................................................167
Underfrequency protection SAPTUF ............................................. 167
Identification.............................................................................. 167
Application.................................................................................167
Setting guidelines...................................................................... 167
Overfrequency protection SAPTOF ...............................................168
Table of contents
5
Application manual