ABB REG316 4 Series Operating Instructions Manual page 400

ABB Switzerland Ltd
4.2.5. Stator ground fault protection for generators in parallel ......... 4-31
4.2.5.1. Principle of operation ............................................................. 4-31
4.2.5.2. Busbar ground faults.............................................................. 4-33
4.2.5.3. Ground fault protection during start-up .................................. 4-33
4.2.5.4. Grounding transformer........................................................... 4-33
4.2.5.5. Ferroresonance damping resistor R
4.2.5.6. Grounding resistor R
4.2.5.7. Contactor ............................................................................... 4-34
4.2.5.8. Residual current c.t. ............................................................... 4-34
4.2.5.9. Required REG 316*4 functions .............................................. 4-35
4.2.5.10. Protection sensitivity .............................................................. 4-35
4.2.6. 100% stator and rotor ground fault protection ........................ 4-39
4.2.7. Breaker failure protection ....................................................... 4-42
4.2.7.1. Introduction ............................................................................ 4-42
4.2.7.2. Three-phase/ single-phase mode .......................................... 4-43
4.2.7.3. 'Redundant Trip'..................................................................... 4-43
4.2.7.4. 'Retrip'.................................................................................... 4-44
4.2.7.5. 'Backup Trip' .......................................................................... 4-44
4.2.7.6. 'Remote Trip'.......................................................................... 4-44
4.2.7.7. 'Unconditional Trip' ................................................................ 4-44
4.2.7.8. 'End Fault Trip'....................................................................... 4-45
4.2.7.9. 'External Trip' ......................................................................... 4-45
4-2
REG 316*4 1MRB520049-Uen / Rev. B
..................................... 4-33
p
............................................................ 4-34
e