GE P741

P74x/EN OP/
Na7
Operation
(OP) 5
-
2
MiCOM P741, P742
, P743
OP
5.3 Optical budgets 44
5.3.1 Main operating features 44
5.4 Trip LED logic 44
5.5 Function keys 45
5.5.1 CB control using hotkeys 45
5.5.2 CB control using function keys 46
5.6 Setting groups selection 47
5.7 Control inputs 47
FIGURES
FIGURE 1: DIFFERENTIAL BUSBAR PROTECTION PRINCIPLE 5
FIGURE 2: P74x SCHEME CHARACTERISTIC 7
FIGURE 3: SENSITIVE EARTH FAULT CHARACTERISTIC 8
FIGURE 4: SENSITIVE EARTH FAULT BLOCKING CHARACTERISTIC 9
FIGURE 5: VT(s) CONNECTED TO THE BAR(s) AND THE CENTRAL UNIT 14
FIGURE 6: CB FAIL ELEMENT LOGIC – PRINCIPLE OF RESET TIME CONTROL 17
FIGURE 7: CB ELEMENT LOGIC 18
FIGURE 8: CB FAIL LOGIC 20
FIGURE 9: CB FAIL LOGIC (DDB INPUTS & OUTPUTS) 21
FIGURE 10: CB FAIL ELEMENT LOGIC – INTERNALLY INITIATED 22
FIGURE 11: CIRCUIT BREAKER FAILURE LOGIC 23
FIGURE 12: EXAMPLES 23
FIGURE 13: CB FAIL ELEMENT LOGIC – EXTERNALLY INITIATED 24
FIGURE 14: CT SUPERVISION 27
FIGURE 15: PICTORIAL COMPARISON OF OPERATING MODES 29
FIGURE 16: DIRECT CONNECTION WITHIN THE LOCAL SUBSTATION 31
FIGURE 17: InterMiCOM TELEPROTECTION VIA A MODEM LINK 32
FIGURE 18: EXAMPLE ASSIGNMENT OF SIGNALS WITHIN THE PSL 32
FIGURE 19: CURRENT VARIATION 34
FIGURE 20: CURRENT VARIATION CRITERIA 34
FIGURE 21: DETERMINATION OF SIGNAL QUALITY IN PERIPHERAL UNIT 35
FIGURE 22: DETERMINATION OF SIGNAL QUALITY IN THE PERIPHERAL UNIT 35
FIGURE 23: CT SATURATION RESET 36
FIGURE 24: CT SATURATION 36
FIGURE 25: DETERMINATION OF SIGNAL QUALITY IN THE PERIPHERAL UNIT 37
FIGURE 26: CT LOCATION 37
FIGURE 27: CB STATE MONITORING FEATURES 40