GE L90 Instruction Manual page 175

5 SETTINGS
Oscillography 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 is selectable, but the number of cycles captured in a single record varies considerably based on
NUMBER OF RECORDS
other 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
RECORDS OSCILLOGRAPHY
ple configurations with corresponding cycles/record.
Table 5–2: OSCILLOGRAPHY CYCLES/RECORD EXAMPLE
RECORDS CT/VTS
1 1
1 1
8 1
8 1
8 2
8 2
8 2
8 2
32 2
A new record may automatically overwrite an older record if
Set the to a percentage of the total buffer size (for example, 10%, 50%, 75%, etc.). A trigger position of
TRIGGER POSITION
25% consists of 25% pre- and 75% post-trigger data. The
any FlexLogic™ parameter (element state, contact input, virtual output, etc.). The relay sampling rate is 64 samples per
cycle.
The setting determines the sampling rate at which AC input signals (that is, current and voltage) are
AC INPUT WAVEFORMS
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.
WARNING
b) DIGITAL CHANNELS
PATH: SETTINGS PRODUCT SETUP
DIGITAL CHANNELS
MESSAGE
MESSAGE
A setting selects the FlexLogic™ operand state recorded in an oscillography trace. The length of
DIGITAL 1(63) CHANNEL
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.
GE Multilin
menu to view the number of cycles captured per record. The following table provides sam-
SAMPLE DIGITALS
RATE
8 0
16 16
16 16
16 16
16 16
16 64
32 64
64 64
64 64
TRIGGER MODE
TRIGGER SOURCE
OSCILLOGRAPHY
DIGITAL CHANNEL
Off
DIGITAL CHANNEL
Off
↓
DIGITAL CHANNEL 63:
Off
L90 Line Current Differential System
ANALOGS CYCLES/
RECORD
0 1872.0
0 1685.0
0 276.0
4 219.5
4 93.5
16 93.5
16 57.6
16 32.3
16 9.5
is set to "Automatic Overwrite".
is always captured in oscillography and may be
DIGITAL CHANNELS
Range: FlexLogic™ operand
1:
Range: FlexLogic™ operand
2:
Range: FlexLogic™ operand
5.2 PRODUCT SETUP
ACTUAL VALUES
5
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