Oscillography - GE N60 Instruction Manual

5.2 PRODUCT SETUP
a) MAIN MENU

PATH: SETTINGS PRODUCT SETUP
 OSCILLOGRAPHY

5
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 captured
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. The minimum number of oscillographic records is three.
Table 5–8: OSCILLOGRAPHY CYCLES/RECORD EXAMPLE
RECORDS CT/VTS
3 1
3 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.
When changes are made to the oscillography settings, all existing oscillography records will be CLEARED.
NOTE
5-70

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 63
32 63
64 63
64 63
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
N60 Network Stability and Synchrophasor Measurement 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 14663
0 6945
0 3472
4 2868
4 1691
16 1221
16 749
16 422
16 124
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