CHAPTER 1:
GEK-106310-AF F650 DIGITAL BAY CONTROLLER 1-5
5.4.2.7 Rectifier time curves..................................................................................................................... 5-54
5.4.2.8 User curves - FlexCurves A/B/C/D .........................................................................................5-55
5.4.3 Phase current.........................................................................................................................5-56
5.4.3.1 Phase time delayed overcurrent elements – phase high/low (51Ph/51pl)......... 5-56
5.4.3.2 Phase instantaneous overcurrent element- phase high/low (50PH/ 50PL).......5-59
5.4.3.3 Phase directional element (67P).............................................................................................. 5-61
5.4.3.4 Thermal model element (49)..................................................................................................... 5-66
5.4.4 Neutral current......................................................................................................................5-67
5.4.4.1 Neutral time-delayed overcurrent element (51N).......................................................... 5-67
5.4.4.2 Neutral instantaneous overcurrent element (50N)........................................................ 5-67
5.4.4.3 Neutral directional element (67N).......................................................................................... 5-69
5.4.4.4 Voltage polarization operation principles .......................................................................... 5-70
5.4.4.5 Current polarization operation principles: ......................................................................... 5-71
5.4.5 Ground current......................................................................................................................5-73
5.4.5.1 Ground time-delayed overcurrent element (51G)..........................................................5-73
5.4.5.2 Ground instantaneous overcurrent element (50G)........................................................ 5-74
5.4.5.3 Ground directional element (67G).......................................................................................... 5-74
5.4.6 Sensitive ground current .................................................................................................5-76
5.4.6.1 Sensitive ground time-delayed overcurrent element (51SG).................................... 5-76
5.4.6.2 Senstitive ground instantaneous overcurrent element (50SG) ................................ 5-77
5.4.6.3 Instantaneous overcurrent element for ungrounded systems (50IG) .................. 5-77
5.4.6.4 Sensitive ground directional element (67SG).................................................................... 5-79
5.4.7 Negative sequence current.............................................................................................5-81
5.4.7.1 Negative sequence overcurrent element (46P) ............................................................... 5-81
5.4.8 Voltage elements..................................................................................................................5-82
5.4.8.1 Phase undervoltage element (27P)........................................................................................ 5-83
5.4.8.2 Phase undervoltage element (59P)........................................................................................ 5-84
5.4.8.3 Neutral overvoltage element high/low (59NH/59nl) ..................................................... 5-84
5.4.8.4 Negative sequence overvoltage element (47).................................................................. 5-85
5.4.8.5 Auxiliary overvoltage element (59X) ..................................................................................... 5-85
5.4.8.6 Auxiliary undervoltage element (27X) .................................................................................. 5-86
5.4.9 Power elements ....................................................................................................................5-86
5.4.9.1 Forward power element (32FP) ............................................................................................... 5-86
5.4.9.2 Directional power element (32) ............................................................................................... 5-87
5.4.9.3 Wattmetric ground fault (32N)................................................................................................. 5-92
5.4.10 Frequency elements...........................................................................................................5-96
5.4.10.1 Underfrequency element (81U)............................................................................................... 5-96
5.4.10.2 Overfrequency element (81O).................................................................................................. 5-97
5.4.10.3 Frequency rate of change......................................................................................................... 5-97
5.4.11 Miscellaneous elements....................................................................................................5-98
5.4.11.1 Broken conductor.......................................................................................................................... 5-98
5.4.11.2 Locker rotor ...................................................................................................................................... 5-99
5.4.12 Load encroachment ........................................................................................................5-101
5.5 Control elements..........................................................................................5-103
5.5.1 Setting group.......................................................................................................................5-103
5.5.2 Synchronism check element - synchrocheck (25).............................................5-104
5.5.2.1 Voltage inputs................................................................................................................................5-105
5.5.2.2 Application ......................................................................................................................................5-105
5.5.2.3 Settings.............................................................................................................................................5-106
5.5.2.4 Synchrocheck states..................................................................................................................5-107
5.5.2.5 Algorithm .........................................................................................................................................5-108
5.5.3 Autoreclose (79)..................................................................................................................5-112
5.5.3.1 Main autoreclose settings .......................................................................................................5-112
5.5.3.2 Autoreclose inputs.......................................................................................................................5-113
5.5.3.3 Autoreclose internal status.....................................................................................................5-114
5.5.3.4 General autoreclose staus diagram ...................................................................................5-115
5.5.3.5 Logic for blocking protection functions during reclose cycle.................................5-116
5.5.4 Breaker failure element (50BF) ...................................................................................5-118
5.5.5 VT fuse failure element (VTFF) ....................................................................................5-121
5.5.5.1 Fuse failure algorithm................................................................................................................5-121
To Next Page
Loading...