ABB Relion 670 series - Page 14

7.14.2 Functionality.....................................................................................................................................409
7.14.3 Detailed interface description...................................................................................................... 410
7.14.4 Function block...................................................................................................................................412
7.14.5 Signals................................................................................................................................................ 412
7.14.6 Settings..............................................................................................................................................413
7.14.7 Monitored data.................................................................................................................................414
7.14.8 Operation principle..........................................................................................................................415
7.14.8.1 Configuration principle................................................................................................................415
7.14.8.2 Generator system grounding methods....................................................................................417
7.14.8.3 100% Stator earth fault protection function.......................................................................... 421
7.14.8.4 General measurement of ground fault impedance............................................................... 426
7.14.8.5 Measuring reference impedance............................................................................................... 427
7.14.8.6 Simplified logic diagram............................................................................................................. 431
7.14.9 Technical data...................................................................................................................................432
7.15 Under impedance protection for generators and transformers ZGVPDIS...............................433
7.15.1 Identification.................................................................................................................................... 433
7.15.2 Functionality..................................................................................................................................... 433
7.15.3 Function block.................................................................................................................................. 433
7.15.4 Signals................................................................................................................................................434
7.15.5 Settings............................................................................................................................................. 434
7.15.6 Monitored data................................................................................................................................ 436
7.15.7 Operation principle......................................................................................................................... 436
7.15.7.1 Operation principle of zone 1.....................................................................................................438
7.15.7.2 Operation principle of zone 2.................................................................................................... 440
7.15.7.3 Operation principle of zone 3.................................................................................................... 444
7.15.7.4 Load encroachment.....................................................................................................................444
7.15.7.5 Under voltage seal-in...................................................................................................................445
7.15.8 Technical data.................................................................................................................................. 446
Section 8 Current protection.............................................................................................. 447
8.1 Instantaneous phase overcurrent protection PHPIOC (50).........................................................447
8.1.1 Identification.................................................................................................................................... 447
8.1.2 Functionality..................................................................................................................................... 447
8.1.3 Function block.................................................................................................................................. 447
8.1.4 Signals................................................................................................................................................447
8.1.5 Settings............................................................................................................................................. 448
8.1.6 Monitored data................................................................................................................................ 449
8.1.7 Operation principle......................................................................................................................... 449
8.1.8 Technical data.................................................................................................................................. 449
8.2 Four step phase overcurrent protection OC4PTOC(51/67)........................................................ 450
8.2.1 Identification.................................................................................................................................... 450
8.2.2 Functionality.....................................................................................................................................450
8.2.3 Function block.................................................................................................................................. 451
Table of contents
8
Technical manual