Oscillography - GE L30 Instruction Manual

5.2 PRODUCT SETUP
a) MAIN MENU
PATH: SETTINGS PRODUCT SETUP

OSCILLOGRAPHY

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-
5
tured simultaneously.
The
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
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
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.
5-38
OSCILLOGRAPHY
NUMBER OF RECORDS:
15
TRIGGER MODE:
MESSAGE
Automatic Overwrite
TRIGGER POSITION:
MESSAGE
50%
TRIGGER SOURCE:
MESSAGE
Off
AC INPUT WAVEFORMS:
MESSAGE
16 samples/cycle
DIGITAL CHANNELS
MESSAGE
ANALOG CHANNELS
MESSAGE
is selectable, but the number of cycles captured in a single record varies considerably based on
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
to a percentage of the total buffer size (for example, 10%, 50%, 75%, etc.). A trigger position of
setting determines the sampling rate at which AC input signals (that is, current and voltage) are
L30 Line Current Differential System
Range: 1 to 64 in steps of 1
Range: Automatic Overwrite, Protected
Range: 0 to 100% in steps of 1
Range: FlexLogic™ operand
Range: Off; 8, 16, 32, 64 samples/cycle
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".
TRIGGER MODE
is always captured in oscillography and may be
TRIGGER SOURCE
5 SETTINGS
5.2.8 OSCILLOGRAPHY
ACTUAL VALUES
GE Multilin