ix
2.16.5 Miscellaneous functions .................................................................................................... 251
2.16.6 Scheme logic ...................................................................................................................... 252
2.16.7 Setting ................................................................................................................................ 254
2.16.8 Data ID .............................................................................................................................. 259
Negative sequence overcurrent protection (OCN) ................................................................... 261
2.17.1 Relay polarity .................................................................................................................... 262
2.17.2 Inverse time and definite time delay characteristic ........................................................ 264
2.17.3 Threshold value ................................................................................................................. 269
2.17.4 Reset Ratio ......................................................................................................................... 269
2.17.5 Miscellaneous functions .................................................................................................... 269
2.17.6 Scheme logic ...................................................................................................................... 270
2.17.7 Setting ................................................................................................................................ 272
2.17.8 Data ID .............................................................................................................................. 277
Thermal overload function (THM) ........................................................................................... 279
2.18.1 Thermal state determination ............................................................................................ 280
2.18.2 Thermal characteristic ...................................................................................................... 281
2.18.3 Scheme logic ...................................................................................................................... 282
2.18.4 Setting ................................................................................................................................ 283
2.18.5 Data ID .............................................................................................................................. 284
Broken conductor protection (BCD) ......................................................................................... 285
2.19.1 Equivalent circuit for a one-phase series fault ................................................................ 286
2.19.2 Characteristic and setting ................................................................................................. 288
2.19.3 Miscellaneous functions .................................................................................................... 288
2.19.4 Scheme logic ...................................................................................................................... 289
2.19.5 Setting ................................................................................................................................ 289
2.19.6 Data ID .............................................................................................................................. 290
Circuit breaker fail protection (CBF) ....................................................................................... 291
2.20.1 CBF operation and its elements ....................................................................................... 292
2.20.2 Re-trip feature ................................................................................................................... 292
2.20.3 Backup feature .................................................................................................................. 293
2.20.4 Scheme logic ...................................................................................................................... 295
2.20.5 Operation timing ............................................................................................................... 297
2.20.6 Setting ................................................................................................................................ 298
2.20.7 Data ID .............................................................................................................................. 299
Overvoltage protection for phase-to-neutral (OV) ................................................................... 301
2.21.1 Drop-off and pickup characteristic ................................................................................... 302
2.21.2 Delay for the operation of the OV element ....................................................................... 302
2.21.3 Time characteristic ............................................................................................................ 302
2.21.4 Miscellaneous functions .................................................................................................... 305
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