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Overvoltage protection for phase-to-phase (OVS) ..................................................................... 176
Drop-off and pickup setting ................................................................................................. 177
2.16.1
Delay for the operation of the OVS element ...................................................................... 177
2.16.2
Time characteristic .............................................................................................................. 177
2.16.3
Miscellaneous functions ....................................................................................................... 179
2.16.4
Scheme logic ......................................................................................................................... 180
2.16.5
Setting ................................................................................................................................... 182
2.16.6
Signal .................................................................................................................................... 184
2.16.7
Earth fault overvoltage protection (OVG) ................................................................................. 186
Drop-off and pickup setting ................................................................................................. 187
2.17.1
Delay of the operation of the OVG element ....................................................................... 187
2.17.2
Time characteristic .............................................................................................................. 187
2.17.3
Miscellaneous functions ....................................................................................................... 189
2.17.4
Scheme logic ......................................................................................................................... 190
2.17.5
Setting ................................................................................................................................... 192
2.17.6
Signal .................................................................................................................................... 194
2.17.7
Negative sequence overvoltage protection (OVN) ..................................................................... 195
Drop-off and pickup setting ................................................................................................. 196
2.18.1
Delay of the operation of the OVN element ....................................................................... 196
2.18.2
Time characteristic .............................................................................................................. 196
2.18.3
Miscellaneous functions ....................................................................................................... 198
2.18.4
Scheme logic ......................................................................................................................... 199
2.18.5
Application ............................................................................................................................ 200
2.18.6
Setting ................................................................................................................................... 201
2.18.7
Signal .................................................................................................................................... 203
2.18.8
Frequency protection with 8 stages (FRQ/DFRQ) .................................................................... 204
FRQ features and characteristics ....................................................................................... 205
2.19.1
DFRQ features and characteristics .................................................................................... 208
2.19.2
Rapid change detector ......................................................................................................... 210
2.19.3
Setting ................................................................................................................................... 215
2.19.4
Signal .................................................................................................................................... 217
2.19.5
VT failure detection (VTF) .......................................................................................................... 221
VTF features ......................................................................................................................... 222
2.20.1
Operation for the VTF function .......................................................................................... 222
2.20.2
Scheme Logic ........................................................................................................................ 223
2.20.3
Setting ................................................................................................................................... 225
2.20.4
Signal .................................................................................................................................... 226
2.20.5
CT failure detection (CTF) .......................................................................................................... 227
CTF features ......................................................................................................................... 228
2.21.1
ix
6F2T0207 (0.01)
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