5-14 F60 Feeder Protection System GE Multilin5.2 PRODUCT SETUP 5 Z SETTINGS5We have:CT primary = “100 A”, andVT primary = PHASE VT SECONDARY x PHASE VT RATIO = 66.4 V x 208 = 13811.2 VThe power cut-off is therefore:power cut-off = (CURRENT CUT-OFF LEVEL × VOLTAGE CUT-OFF LEVEL × CT primary × VT primary)/VT secondary= ( × 0.02 pu × 1.0 V × 100 A × 13811.2 V) / 66.4 V= 720.5 wattsAny calculated power value below this cut-off will not be displayed. As well, the three-phase energy data will not accumu-late if the total power from all three phases does not exceed the power cut-off.Lower the VOLTAGE CUT-OFF LEVEL and CURRENT CUT-OFF LEVEL with care as the relay accepts lower signalsas valid measurements. Unless dictated otherwise by a specific application, the default settings of “0.02pu” for CURRENT CUT-OFF LEVEL and “1.0 V” for VOLTAGE CUT-OFF LEVEL are recommended.5.2.3 CLEAR RELAY RECORDSPATH: SETTINGS Ö PRODUCT SETUP ÖØ CLEAR RELAY RECORDSSelected records can be cleared from user-programmable conditions with FlexLogic™ operands. Assigning user-program-mable pushbuttons to clear specific records are typical applications for these commands. Since the F60 responds to risingedges of the configured FlexLogic™ operands, they must be asserted for at least 50 ms to take effect.Clearing records with user-programmable operands is not protected by the command password. However, user-program-mable pushbuttons are protected by the command password. Thus, if they are used to clear records, the user-programma-ble pushbuttons can provide extra security if required.For example, to assign User-Programmable Pushbutton 1 to clear demand records, the following settings should beapplied. CLEAR RELAY RECORDSCLEAR FAULT REPORTS:OffRange: FlexLogic™ operandMESSAGE CLEAR EVENT RECORDS:OffRange: FlexLogic™ operandMESSAGE CLEAR OSCILLOGRAPHY?NoRange: FlexLogic™ operandMESSAGE CLEAR DATA LOGGER:OffRange: FlexLogic™ operandMESSAGE CLEAR ARC AMPS 1:OffRange: FlexLogic™ operandMESSAGE CLEAR ARC AMPS 2:OffRange: FlexLogic™ operandMESSAGE CLEAR DEMAND:OffRange: FlexLogic™ operandMESSAGE CLEAR ENERGY:OffRange: FlexLogic™ operandMESSAG CLEAR HIZ RECORDS:OffRange: FlexLogic™ operandMESSAGE RESET UNAUTH ACCESS:OffRange: FlexLogic™ operandMESSAGE CLEAR DIR I/O STATS:OffRange: FlexLogic™ operand.Valid only for units with Direct I/O module.3NOTE
