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Operation for the CTF function .......................................................................................... 228
2.21.2
Scheme logic ......................................................................................................................... 228
2.21.3
Setting ................................................................................................................................... 230
2.21.4
Signal .................................................................................................................................... 231
2.21.5
Three-phase autoreclose (ARC) .................................................................................................. 232
Outline .................................................................................................................................. 233
2.22.1
Terminology .......................................................................................................................... 234
2.22.2
Function block diagram ....................................................................................................... 237
2.22.3
Autoreclosing logic ............................................................................................................... 238
2.22.4
Timing diagrams .................................................................................................................. 244
2.22.5
Shot number coordination ................................................................................................... 247
2.22.6
Miscellaneous feature .......................................................................................................... 251
2.22.7
Application guidelines ......................................................................................................... 252
2.22.8
Setting ................................................................................................................................... 257
2.22.9
Signal................................................................................................................................. 258
2.22.10
Three-phase trip circuit (TRC) ................................................................................................... 260
Command for tripping CB and signal to block reclosing CB ............................................ 262
2.23.1
Recording identifiers for respective fault types ................................................................. 263
2.23.2
Scheme logic ......................................................................................................................... 264
2.23.3
Setting ................................................................................................................................... 267
2.23.4
Signal .................................................................................................................................... 268
2.23.5
Protection common (PROT_COMMON) .................................................................................... 270
Decision of CB open/close status ......................................................................................... 271
2.24.1
Decision of DS open/close status ......................................................................................... 273
2.24.2
Dead line detection .............................................................................................................. 274
2.24.3
Detection of current change (OCD) ..................................................................................... 275
2.24.4
User logic switches ............................................................................................................... 276
2.24.5
Setting ................................................................................................................................... 277
2.24.6
Signal .................................................................................................................................... 278
2.24.7
Voltage check for autoreclose (VCHK) ....................................................................................... 280
Voltage condition and check zone ....................................................................................... 281
2.25.1
Synchronism check scheme ................................................................................................. 282
2.25.2
VCHK setting ....................................................................................................................... 286
2.25.3
Check logic for the voltage and the synchronism .............................................................. 290
2.25.4
Setting ................................................................................................................................... 291
2.25.5
Signal .................................................................................................................................... 292
2.25.6
Single-end fault locator (FL) ...................................................................................................... 293
Computation method ........................................................................................................... 294
2.26.1
Output of FL computation on display ................................................................................. 297
2.26.2
x
6F2T0207 (0.01)
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