GE b30 - Page 205

GE Multilin B30 Bus Differential System 5-71
5 SETTINGS 5.2 PRODUCT SETUP
5
A new record can automatically overwrite an older record when TRIGGER MODE is set to “Automatic Overwrite.”
Set the TRIGGER POSITION to a percentage of the total buffer size (for example, 10%, 50%, 75%, and so on). A trigger posi-
tion of 25% consists of 25% pre- and 75% post-trigger data. The TRIGGER SOURCE is always captured in oscillography and
can be any FlexLogic parameter (element state, contact input, virtual output, and so on). The relay sampling rate is 64 sam-
ples 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 are 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 5–9: OSCILLOGRAPHY CYCLES/RECORD EXAMPLE
RECORDS CT/VTS SAMPLE
RATE
DIGITAL
CHANNELS
ANALOG
CHANNELS
CYCLES PER
RECORD
3 1 32 32 16 2399
3 1 64 32 16 1450
161 323216666
161 643216402
321 323216352
321 643216213
3 2 32 32 16 1516
3 2 643216851
162 323216421
 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
NOTE