6-18 L60 Line Phase Comparison Relay GE Multilin6.4 RECORDS 6 ACTUAL VALUES66.4RECORDS 6.4.1 FAULT REPORTSPATH: ACTUAL VALUES ÖØ RECORDS Ö FAULT REPORTS Ö FAULT REPORT 1(15)The latest 15 fault reports can be stored. The most recent fault location calculation (when applicable) is displayed in thismenu, along with the date and time stamp of the event which triggered the calculation. See the SETTINGS Ö PRODUCTSETUP ÖØ FAULT REPORTS Ö FAULT REPORT 1 menu for assigning the source and trigger for fault calculations. Refer to theCOMMANDS ÖØ CLEAR RECORDS menu for manual clearing of the fault reports and to the SETTINGS Ö PRODUCT SETUP ÖØCLEAR RELAY RECORDS menu for automated clearing of the fault reports.Fault type determination is required for calculation of fault location – the algorithm uses the angle between the negative andpositive sequence components of the relay currents. To improve accuracy and speed of operation, the fault components ofthe currents are used; that is, the pre-fault phasors are subtracted from the measured current phasors. In addition to theangle relationships, certain extra checks are performed on magnitudes of the negative and zero-sequence currents.The single-ended fault location method assumes that the fault components of the currents supplied from the local (A) andremote (B) systems are in phase. The figure below shows an equivalent system for fault location.Figure 6–4: EQUIVALENT SYSTEM FOR FAULT LOCATIONThe following equations hold true for this equivalent system.(EQ 6.1)where: m = sought pu distance to fault, Z = positive sequence impedance of the line.The currents from the local and remote systems can be parted between their fault (F) and pre-fault load (pre) components:(EQ 6.2)NO FAULTS TO REPORTor FAULT REPORT 1FAULT 1LINE ID: SRC 1Range: SRC 1, SRC 2, SRC 3, SRC 4MESSAGE FAULT 1 DATE:2000/08/11Range: YYYY/MM/DDMESSAGE FAULT 1 TIME:00:00:00.000000Range: HH:MM:SS.ssssssMESSAGE FAULT 1 TYPE:ABGRange: not available if the source VTs are in the “Delta”configurationMESSAGE FAULT 1 LOCATION00.0 kmRange: not available if the source VTs are in the “Delta”configurationMESSAGE FAULT 1 RECLOSESHOT: 0Range: where applicablemZ (1-m)ZR FZ A Z BE A E BV A V BV FI A I BLocal busRemotebusdistance to fault842780A1.CDRV A m Z I A⋅ ⋅ R F I A I B+( )⋅+=I A I AF I Apre+=
