Oscillography - GE L90 Instruction Manual

PRODUCT SETUP

5.3.8 Oscillography

5.3.8.1 Menu
SETTINGS  PRODUCT SETUP  OSCILLOGRAPHY
 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 can be captured
simultaneously.
5
When EnerVista UR Setup creates a new settings file, a Smart defaults feature automatically enters a basic oscillography
configuration. The basic configuration changes the factory default values to make the number of samples per cycle 32,
adds a selection of digital and analog channels that are often of interest, and adds a FlexLogic equation to trigger
oscillography. Review and update this basic configuration as required for the application at hand.
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
oscillography; the more data captured, the less the number of cycles captured per record. See the
RECORDS  OSCILLOGRAPHY
configurations with corresponding cycles/record. The minimum number of oscillographic records is three.
Table 5-13: Oscillography cycles/record example
Records CT/VTs
3 1
3 1
16 1
16 1
32 1
32 1
3 2
3 2
16 2
— A new record automatically overwrites an older record when
TRIGGER MODE
Overwrite."
TRIGGER POSITION
position of 25% consists of 25% pre- and 75% post-trigger data.
5-102
NUMBER OF RECORDS:

5
TRIGGER MODE:

Automatic Overwrite
TRIGGER POSITION:

50%
TRIGGER SOURCE:

Off
AC INPUT WAVEFORMS:

16 samples/cycle
 DIGITAL CHANNELS


 ANALOG CHANNELS


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 sample
Sample rate Digital
channels
32 32
64 32
32 32
64 32
32 32
64 32
32 32
64 32
32 32
— Set this to a percentage of the total buffer size (for example, 10%, 50%, 75%, and so on). A trigger
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
See below
See below
Analog Cycles per
channels record
16 2399
16 1450
16 666
16 402
16 352
16 213
16 1516
16 851
16 421
TRIGGER MODE
L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
ACTUAL VALUES 
is set to "Automatic