GE G30, Instruction Manual, Page: 212 / 698

5-72 G30 Generator Protection System GE Multilin
5.2 PRODUCT SETUP 5 SETTINGS
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
16 1 32 32 16 666
16 1 64 32 16 402
32 1 32 32 16 352
32 1 64 32 16 213
3 2 32 32 16 1516
3 2 64 32 16 851
16 2 32 32 16 421

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