ABB ret650 - Page 11

Power supply quality............................................................ 152
High impedance earthed systems........................................ 152
Direct earthed system.......................................................... 153
Settings for two step residual overvoltage protection...........154
Overexcitation protection OEXPVPH ............................................ 156
Identification.............................................................................. 156
Application................................................................................. 156
Setting guidelines...................................................................... 158
Recommendations for input and output signals................... 158
Settings................................................................................ 159
Service value report............................................................. 160
Setting example....................................................................160
Section 9 Frequency protection....................................................163
Underfrequency protection SAPTUF ............................................. 163
Identification.............................................................................. 163
Application................................................................................. 163
Setting guidelines...................................................................... 163
Overfrequency protection SAPTOF ...............................................164
Identification.............................................................................. 164
Application................................................................................. 165
Setting guidelines...................................................................... 165
Rate-of-change of frequency protection SAPFRC .........................166
Identification.............................................................................. 166
Application................................................................................. 166
Setting guidelines...................................................................... 166
Section 10 Secondary system supervision.....................................169
Current circuit supervision CCSSPVC............................................169
Identification.............................................................................. 169
Application................................................................................. 169
Setting guidelines...................................................................... 169
Fuse failure supervision FUFSPVC................................................170
Identification.............................................................................. 170
Application................................................................................. 170
Setting guidelines...................................................................... 171
General.................................................................................171
Setting of common parameters............................................ 171
Negative sequence based....................................................172
Zero sequence based...........................................................173
Delta U and delta I ...............................................................173
Dead line detection...............................................................174
Section 11 Control..........................................................................175
Table of contents
Transformer protection RET650 2.2 IEC 5
Application manual