5-38 L30 Line Current Differential System GE Multilin5.2 PRODUCT SETUP 5 SETTINGS55.2.8 OSCILLOGRAPHYa) MAIN MENUPATH: SETTINGS Ö PRODUCT SETUP ÖØ OSCILLOGRAPHYOscillography records contain waveforms captured at the sampling rate as well as other relay data at the point of trigger.Oscillography records are triggered by a programmable FlexLogic™ operand. Multiple oscillography records may be cap-tured simultaneously.The NUMBER OF RECORDS is selectable, but the number of cycles captured in a single record varies considerably based onother factors such as sample rate and the number of operational modules. There is a fixed amount of data storage for oscil-lography; the more data captured, the less the number of cycles captured per record. See the ACTUAL VALUES ÖØRECORDS ÖØ OSCILLOGRAPHY menu to view the number of cycles captured per record. The following table provides sam-ple configurations with corresponding cycles/record.A new record may automatically overwrite an older record if TRIGGER MODE is set to “Automatic Overwrite”.Set the TRIGGER POSITION to a percentage of the total buffer size (for example, 10%, 50%, 75%, etc.). A trigger position of25% consists of 25% pre- and 75% post-trigger data. The TRIGGER SOURCE is always captured in oscillography and may beany FlexLogic™ parameter (element state, contact input, virtual output, etc.). The relay sampling rate is 64 samples percycle.The AC INPUT WAVEFORMS setting determines the sampling rate at which AC input signals (that is, current and voltage) arestored. Reducing the sampling rate allows longer records to be stored. This setting has no effect on the internal samplingrate of the relay which is always 64 samples per cycle; that is, it has no effect on the fundamental calculations of the device. OSCILLOGRAPHYNUMBER OF RECORDS:15Range: 1 to 64 in steps of 1MESSAGE TRIGGER MODE:Automatic OverwriteRange: Automatic Overwrite, ProtectedMESSAGE TRIGGER POSITION:50%Range: 0 to 100% in steps of 1MESSAGE TRIGGER SOURCE:OffRange: FlexLogic™ operandMESSAGE AC INPUT WAVEFORMS:16 samples/cycleRange: Off; 8, 16, 32, 64 samples/cycleMESSAGE DIGITAL CHANNELSMESSAGE ANALOG CHANNELSTable 5–2: OSCILLOGRAPHY CYCLES/RECORD EXAMPLERECORDS CT/VTS SAMPLERATEDIGITALS ANALOGS CYCLES/RECORD1 1 8 0 0 1872.01 1 16 16 0 1685.08 1 16 16 0 276.08 1 16 16 4 219.58 2 16 16 4 93.58 2 16 64 16 93.58 2 32 64 16 57.68 2 64 64 16 32.332 2 64 64 16 9.5
