5-44 T60 Transformer Protection System GE Multilin
5.2 PRODUCT SETUP 5 SETTINGS
5
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 of
25% consists of 25% pre- and 75% post-trigger data. The TRIGGER SOURCE is always captured in oscillography and may be
any FlexLogic™ parameter (element state, contact input, virtual output, etc.). The relay sampling rate is 64 samples per
cycle.
The AC INPUT WAVEFORMS setting determines the sampling rate at which AC input signals (that is, current and voltage) are
stored. Reducing the sampling rate allows longer records to be stored. This setting has no effect on the internal sampling
rate of the relay which is always 64 samples per cycle; that is, it has no effect on the fundamental calculations of the device.
When changes are made to the oscillography settings, all existing oscillography records will be CLEARED.
b) DIGITAL CHANNELS
PATH: SETTINGS PRODUCT SETUP OSCILLOGRAPHY DIGITAL CHANNELS
A DIGITAL 1(63) CHANNEL setting selects the FlexLogic™ operand state recorded in an oscillography trace. The length of
each oscillography trace depends in part on the number of parameters selected here. Parameters set to “Off” are ignored.
Upon startup, the relay will automatically prepare the parameter list.
Table 5–2: OSCILLOGRAPHY CYCLES/RECORD EXAMPLE
RECORDS CT/VTS SAMPLE
RATE
DIGITALS ANALOGS CYCLES/
RECORD
118001872.0
1 1 16 16 0 1685.0
8 1 16 16 0 276.0
8 1 16 16 4 219.5
8 2 16 16 4 93.5
8 2 16 63 16 93.5
8 2 32 63 16 57.6
8 2 64 63 16 32.3
322 6463169.5
DIGITAL CHANNELS
DIGITAL CHANNEL 1:
Off
Range: FlexLogic™ operand
MESSAGE
DIGITAL CHANNEL 2:
Off
Range: FlexLogic™ operand
MESSAGE
DIGITAL CHANNEL 3:
Off
Range: FlexLogic™ operand
↓
MESSAGE
DIGITAL CHANNEL 63:
Off
Range: FlexLogic™ operand
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